diff --git a/CHANGELOG.md b/CHANGELOG.md
index 806dfbbbe..030d17b4d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,9 +6,35 @@ and this library adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+This release adds several important new features:
+- Currency exchange rates (currently just USD/ZEC) are now made available via the SDK.
+  The exchange rate computed as the median of values provided by at least three separate
+  cryptocurrency exchanges, and is fetched over Tor connections in order to avoid leaking
+  the wallet's IP address to the exchanges.
+- Sending to ZIP 320 (TEX) addresses is now supported. When sending to a ZIP 320 address,
+  the wallet will first automatically de-shield the required funds to a fresh ephemeral 
+  transparent address, and then will make a second fully-transparent transaction sending
+  the funds to the eventual recipient that is not linkable via on-chain information to any 
+  other transaction in the  user's wallet.
+- As part of adding ZIP 320 support, the SDK now also provides full support for recovering
+  transparent transaction history. Prior to this release, only transactions belonging to the
+  wallet that contained either some shielded component OR a member of the current
+  transparent UTXO set were included in transaction history.
+
+### Changed
+- Migrated to Rust 1.80.0.
+- `Synchronizer.proposeTransfer` now supports TEX addresses (ZIP 320).
+- Internal transactions-enhancing logic has changed to support the history of transactions made to TEX addresses 
+
 ### Added
+- `Synchronizer.isValidTexAddr` which checks whether the given address is a valid ZIP 320 TEX address
+- `Synchronizer.exchangeRateUsd` is a `StateFlow` containing the latest USD/ZEC
+  exchange rate, along with the `Instant` it was fetched. It can be initialized
+  and refreshed by calling `Synchronizer.refreshExchangeRateUsd()`.
+- `ZatoshiExt.toFiatString` is now a public function
 - `Synchronizer.getFastestServers([LightWalletEndpoint])` is a flow that measures connections to given endpoints and
   returns the three fastest ones
+- `Synchronizer.getTAddressTransactions` returns all the transactions for a given t-address over the given range
 
 ### Changed
 - Checkpoints update
diff --git a/backend-lib/Cargo.lock b/backend-lib/Cargo.lock
index 49cc9d627..dff08d7e7 100644
--- a/backend-lib/Cargo.lock
+++ b/backend-lib/Cargo.lock
@@ -2,6 +2,21 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "addr2line"
+version = "0.22.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6e4503c46a5c0c7844e948c9a4d6acd9f50cccb4de1c48eb9e291ea17470c678"
+dependencies = [
+ "gimli",
+]
+
+[[package]]
+name = "adler"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+
 [[package]]
 name = "aead"
 version = "0.5.2"
@@ -21,6 +36,7 @@ dependencies = [
  "cfg-if",
  "cipher",
  "cpufeatures",
+ "zeroize",
 ]
 
 [[package]]
@@ -32,7 +48,7 @@ dependencies = [
  "cfg-if",
  "once_cell",
  "version_check",
- "zerocopy",
+ "zerocopy 0.7.35",
 ]
 
 [[package]]
@@ -50,17 +66,76 @@ version = "0.2.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5c6cb57a04249c6480766f7f7cef5467412af1490f8d1e243141daddada3264f"
 
+[[package]]
+name = "amplify"
+version = "4.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9e711289a6cb28171b4f0e6c8019c69ff9476050508dc082167575d458ff74d0"
+dependencies = [
+ "amplify_derive",
+ "amplify_num",
+ "ascii",
+ "wasm-bindgen",
+]
+
+[[package]]
+name = "amplify_derive"
+version = "4.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "759dcbfaf94d838367a86d493ec34ccc8aa6fe365cb7880d6bf89006de24d9c1"
+dependencies = [
+ "amplify_syn",
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+]
+
+[[package]]
+name = "amplify_num"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "04c009c5c4de814911b177e2ea59e4930bb918978ed3cce4900d846a6ceb0838"
+dependencies = [
+ "wasm-bindgen",
+]
+
+[[package]]
+name = "amplify_syn"
+version = "2.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7736fb8d473c0d83098b5bac44df6a561e20470375cd8bcae30516dc889fd62a"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+]
+
+[[package]]
+name = "android-tzdata"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e999941b234f3131b00bc13c22d06e8c5ff726d1b6318ac7eb276997bbb4fef0"
+
+[[package]]
+name = "android_system_properties"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "anyhow"
-version = "1.0.82"
+version = "1.0.86"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f538837af36e6f6a9be0faa67f9a314f8119e4e4b5867c6ab40ed60360142519"
+checksum = "b3d1d046238990b9cf5bcde22a3fb3584ee5cf65fb2765f454ed428c7a0063da"
 
 [[package]]
 name = "arrayref"
-version = "0.3.7"
+version = "0.3.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6b4930d2cb77ce62f89ee5d5289b4ac049559b1c45539271f5ed4fdc7db34545"
+checksum = "9d151e35f61089500b617991b791fc8bfd237ae50cd5950803758a179b41e67a"
 
 [[package]]
 name = "arrayvec"
@@ -68,17 +143,152 @@ version = "0.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "96d30a06541fbafbc7f82ed10c06164cfbd2c401138f6addd8404629c4b16711"
 
+[[package]]
+name = "arti-client"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "20917bbfb3284158fb0d9f610b56528a8b5010f82ead92316bd4b2a42e33553d"
+dependencies = [
+ "cfg-if",
+ "derive_builder_fork_arti",
+ "derive_more",
+ "directories",
+ "educe",
+ "fs-mistrust",
+ "futures",
+ "hostname-validator",
+ "humantime-serde",
+ "libc",
+ "pin-project",
+ "postage",
+ "safelog",
+ "serde",
+ "thiserror",
+ "tor-async-utils",
+ "tor-basic-utils",
+ "tor-cell",
+ "tor-chanmgr",
+ "tor-checkable",
+ "tor-circmgr",
+ "tor-config",
+ "tor-dirmgr",
+ "tor-error",
+ "tor-guardmgr",
+ "tor-keymgr",
+ "tor-linkspec",
+ "tor-llcrypto",
+ "tor-netdir",
+ "tor-netdoc",
+ "tor-persist",
+ "tor-proto",
+ "tor-rtcompat",
+ "tracing",
+ "void",
+]
+
+[[package]]
+name = "ascii"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d92bec98840b8f03a5ff5413de5293bfcd8bf96467cf5452609f939ec6f5de16"
+
+[[package]]
+name = "async-compression"
+version = "0.4.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fec134f64e2bc57411226dfc4e52dec859ddfc7e711fc5e07b612584f000e4aa"
+dependencies = [
+ "flate2",
+ "futures-core",
+ "futures-io",
+ "memchr",
+ "pin-project-lite",
+ "xz2",
+ "zstd",
+ "zstd-safe",
+]
+
+[[package]]
+name = "async-rustls"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ecfa55659849ace733f86ccd219da40abd8bc14124e40b312433e85a5a266e77"
+dependencies = [
+ "futures-io",
+ "rustls",
+]
+
+[[package]]
+name = "async-trait"
+version = "0.1.81"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6e0c28dcc82d7c8ead5cb13beb15405b57b8546e93215673ff8ca0349a028107"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.72",
+]
+
+[[package]]
+name = "async_executors"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a982d2f86de6137cc05c9db9a915a19886c97911f9790d04f174cede74be01a5"
+dependencies = [
+ "blanket",
+ "futures-core",
+ "futures-task",
+ "futures-util",
+ "pin-project",
+ "rustc_version",
+ "tokio",
+]
+
+[[package]]
+name = "asynchronous-codec"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a860072022177f903e59730004fb5dc13db9275b79bb2aef7ba8ce831956c233"
+dependencies = [
+ "bytes",
+ "futures-sink",
+ "futures-util",
+ "memchr",
+ "pin-project-lite",
+]
+
+[[package]]
+name = "atomic"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c59bdb34bc650a32731b31bd8f0829cc15d24a708ee31559e0bb34f2bc320cba"
+
 [[package]]
 name = "autocfg"
-version = "1.2.0"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c4b4d0bd25bd0b74681c0ad21497610ce1b7c91b1022cd21c80c6fbdd9476b0"
+
+[[package]]
+name = "backtrace"
+version = "0.3.73"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1fdabc7756949593fe60f30ec81974b613357de856987752631dea1e3394c80"
+checksum = "5cc23269a4f8976d0a4d2e7109211a419fe30e8d88d677cd60b6bc79c5732e0a"
+dependencies = [
+ "addr2line",
+ "cc",
+ "cfg-if",
+ "libc",
+ "miniz_oxide",
+ "object",
+ "rustc-demangle",
+]
 
 [[package]]
-name = "base58"
+name = "base16ct"
 version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6107fe1be6682a68940da878d9e9f5e90ca5745b3dec9fd1bb393c8777d4f581"
+checksum = "4c7f02d4ea65f2c1853089ffd8d2787bdbc63de2f0d29dedbcf8ccdfa0ccd4cf"
 
 [[package]]
 name = "base64"
@@ -86,11 +296,17 @@ version = "0.21.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9d297deb1925b89f2ccc13d7635fa0714f12c87adce1c75356b39ca9b7178567"
 
+[[package]]
+name = "base64"
+version = "0.22.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"
+
 [[package]]
 name = "base64ct"
-version = "1.0.1"
+version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8a32fd6af2b5827bce66c29053ba0e7c42b9dcab01835835058558c10851a46b"
+checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 
 [[package]]
 name = "bech32"
@@ -114,30 +330,32 @@ dependencies = [
  "log",
  "num_cpus",
  "pairing",
- "rand_core",
+ "rand_core 0.6.4",
  "rayon",
  "subtle",
 ]
 
 [[package]]
-name = "bip0039"
-version = "0.10.1"
+name = "bip32"
+version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bef0f0152ec5cf17f49a5866afaa3439816207fd4f0a224c0211ffaf5e278426"
+checksum = "aa13fae8b6255872fd86f7faf4b41168661d7d78609f7bfe6771b85c6739a15b"
 dependencies = [
+ "bs58",
  "hmac",
- "pbkdf2",
- "rand",
- "sha2",
- "unicode-normalization",
+ "rand_core 0.6.4",
+ "ripemd",
+ "secp256k1",
+ "sha2 0.10.8",
+ "subtle",
  "zeroize",
 ]
 
 [[package]]
 name = "bitflags"
-version = "2.5.0"
+version = "2.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cf4b9d6a944f767f8e5e0db018570623c85f3d925ac718db4e06d0187adb21c1"
+checksum = "b048fb63fd8b5923fc5aa7b340d8e156aec7ec02f0c78fa8a6ddc2613f6f71de"
 
 [[package]]
 name = "bitvec"
@@ -173,6 +391,26 @@ dependencies = [
  "constant_time_eq",
 ]
 
+[[package]]
+name = "blanket"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e0b121a9fe0df916e362fb3271088d071159cdf11db0e4182d02152850756eff"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.72",
+]
+
+[[package]]
+name = "block-buffer"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
+dependencies = [
+ "generic-array",
+]
+
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -191,17 +429,23 @@ dependencies = [
  "ff",
  "group",
  "pairing",
- "rand_core",
+ "rand_core 0.6.4",
  "subtle",
 ]
 
+[[package]]
+name = "bounded-vec-deque"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2225b558afc76c596898f5f1b3fc35cfce0eb1b13635cbd7d1b2a7177dc10ccd"
+
 [[package]]
 name = "bs58"
 version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bf88ba1141d185c399bee5288d850d63b8369520c1eafc32a0430b5b6c287bf4"
 dependencies = [
- "sha2",
+ "sha2 0.10.8",
  "tinyvec",
 ]
 
@@ -211,6 +455,12 @@ version = "3.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "79296716171880943b8470b5f8d03aa55eb2e645a4874bdbb28adb49162e012c"
 
+[[package]]
+name = "by_address"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "64fa3c856b712db6612c019f14756e64e4bcea13337a6b33b696333a9eaa2d06"
+
 [[package]]
 name = "byteorder"
 version = "1.5.0"
@@ -219,9 +469,15 @@ checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
 
 [[package]]
 name = "bytes"
-version = "1.6.0"
+version = "1.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fca2be1d5c43812bae364ee3f30b3afcb7877cf59f4aeb94c66f313a41d2fac9"
+
+[[package]]
+name = "caret"
+version = "0.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "514de17de45fdb8dc022b1a7975556c53c86f9f0aa5f534b98977b171857c2c9"
+checksum = "4ac3ae35de516b8ee4bfb6affc72bd6c121d2967206f307c026890f99c7875a0"
 
 [[package]]
 name = "cbc"
@@ -234,9 +490,13 @@ dependencies = [
 
 [[package]]
 name = "cc"
-version = "1.0.94"
+version = "1.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "17f6e324229dc011159fcc089755d1e2e216a90d43a7dea6853ca740b84f35e7"
+checksum = "26a5c3fd7bfa1ce3897a3a3501d362b2d87b7f2583ebcb4a949ec25911025cbc"
+dependencies = [
+ "jobserver",
+ "libc",
+]
 
 [[package]]
 name = "cesu8"
@@ -274,6 +534,19 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "chrono"
+version = "0.4.38"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a21f936df1771bf62b77f047b726c4625ff2e8aa607c01ec06e5a05bd8463401"
+dependencies = [
+ "android-tzdata",
+ "iana-time-zone",
+ "num-traits",
+ "serde",
+ "windows-targets 0.52.6",
+]
+
 [[package]]
 name = "cipher"
 version = "0.4.4"
@@ -285,6 +558,17 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "coarsetime"
+version = "0.1.34"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "13b3839cf01bb7960114be3ccf2340f541b6d0c81f8690b007b2b39f750f7e5d"
+dependencies = [
+ "libc",
+ "wasix",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "combine"
 version = "4.6.7"
@@ -295,12 +579,53 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "concurrent-queue"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4ca0197aee26d1ae37445ee532fefce43251d24cc7c166799f4d46817f1d3973"
+dependencies = [
+ "crossbeam-utils",
+]
+
+[[package]]
+name = "config"
+version = "0.13.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23738e11972c7643e4ec947840fc463b6a571afcd3e735bdfce7d03c7a784aca"
+dependencies = [
+ "async-trait",
+ "lazy_static",
+ "nom",
+ "pathdiff",
+ "serde",
+ "toml 0.5.11",
+]
+
+[[package]]
+name = "const-oid"
+version = "0.9.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c2459377285ad874054d797f3ccebf984978aa39129f6eafde5cdc8315b612f8"
+
 [[package]]
 name = "constant_time_eq"
 version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f7144d30dcf0fafbce74250a3963025d8d52177934239851c917d29f1df280c2"
 
+[[package]]
+name = "convert_case"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6245d59a3e82a7fc217c5828a6692dbc6dfb63a0c8c90495621f7b9d79704a0e"
+
+[[package]]
+name = "core-foundation-sys"
+version = "0.8.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "06ea2b9bc92be3c2baa9334a323ebca2d6f074ff852cd1d7b11064035cd3868f"
+
 [[package]]
 name = "cpufeatures"
 version = "0.2.12"
@@ -310,11 +635,20 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "crc32fast"
+version = "1.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a97769d94ddab943e4510d138150169a2758b5ef3eb191a9ee688de3e23ef7b3"
+dependencies = [
+ "cfg-if",
+]
+
 [[package]]
 name = "crossbeam-channel"
-version = "0.5.12"
+version = "0.5.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ab3db02a9c5b5121e1e42fbdb1aeb65f5e02624cc58c43f2884c6ccac0b82f95"
+checksum = "33480d6946193aa8033910124896ca395333cae7e2d1113d1fef6c3272217df2"
 dependencies = [
  "crossbeam-utils",
 ]
@@ -338,11 +672,20 @@ dependencies = [
  "crossbeam-utils",
 ]
 
+[[package]]
+name = "crossbeam-queue"
+version = "0.3.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "df0346b5d5e76ac2fe4e327c5fd1118d6be7c51dfb18f9b7922923f287471e35"
+dependencies = [
+ "crossbeam-utils",
+]
+
 [[package]]
 name = "crossbeam-utils"
-version = "0.8.19"
+version = "0.8.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
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+checksum = "22ec99545bb0ed0ea7bb9b8e1e9122ea386ff8a48c0922e43f36d45ab09e0e80"
 
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+dependencies = [
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+ "rand_core 0.6.4",
+ "subtle",
+ "zeroize",
+]
+
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@@ -360,6 +715,28 @@ dependencies = [
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+dependencies = [
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+
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+ "rand_core 0.5.1",
+ "subtle",
+ "zeroize",
+]
+
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@@ -370,1270 +747,3648 @@ dependencies = [
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- "halo2_proofs",
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+ "dirs-sys",
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 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "87cc5ceb3875bb20c2890005a4e226a4651264a5c75edb2421b52861a0a0cb50"
+checksum = "b8fa9be0de6cf49e536ce1851f987bd21a43b771b09473c3549a6c853db37c1c"
 dependencies = [
- "tinyvec_macros",
+ "tower-layer",
+ "tower-service",
+ "tracing",
 ]
 
 [[package]]
-name = "tinyvec_macros"
-version = "0.1.1"
+name = "tower-layer"
+version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"
+checksum = "121c2a6cda46980bb0fcd1647ffaf6cd3fc79a013de288782836f6df9c48780e"
 
 [[package]]
-name = "tonic-build"
-version = "0.10.2"
+name = "tower-service"
+version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9d021fc044c18582b9a2408cd0dd05b1596e3ecdb5c4df822bb0183545683889"
-dependencies = [
- "prettyplease",
- "proc-macro2",
- "prost-build",
- "quote",
- "syn",
-]
+checksum = "8df9b6e13f2d32c91b9bd719c00d1958837bc7dec474d94952798cc8e69eeec3"
 
 [[package]]
 name = "tracing"
@@ -1641,6 +4396,7 @@ version = "0.1.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c3523ab5a71916ccf420eebdf5521fcef02141234bbc0b8a49f2fdc4544364ef"
 dependencies = [
+ "log",
  "pin-project-lite",
  "tracing-attributes",
  "tracing-core",
@@ -1654,7 +4410,7 @@ checksum = "34704c8d6ebcbc939824180af020566b01a7c01f80641264eba0999f6c2b6be7"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.72",
 ]
 
 [[package]]
@@ -1684,14 +4440,51 @@ version = "0.3.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ad0f048c97dbd9faa9b7df56362b8ebcaa52adb06b498c050d2f4e32f90a7a8b"
 dependencies = [
+ "matchers",
  "nu-ansi-term",
+ "once_cell",
+ "regex",
  "sharded-slab",
  "smallvec",
  "thread_local",
+ "tracing",
  "tracing-core",
  "tracing-log",
 ]
 
+[[package]]
+name = "tracing-test"
+version = "0.2.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "557b891436fe0d5e0e363427fc7f217abf9ccd510d5136549847bdcbcd011d68"
+dependencies = [
+ "tracing-core",
+ "tracing-subscriber",
+ "tracing-test-macro",
+]
+
+[[package]]
+name = "tracing-test-macro"
+version = "0.2.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "04659ddb06c87d233c566112c1c9c5b9e98256d9af50ec3bc9c8327f873a7568"
+dependencies = [
+ "quote",
+ "syn 2.0.72",
+]
+
+[[package]]
+name = "try-lock"
+version = "0.2.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e421abadd41a4225275504ea4d6566923418b7f05506fbc9c0fe86ba7396114b"
+
+[[package]]
+name = "typed-index-collections"
+version = "3.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "183496e014253d15abbe6235677b1392dba2d40524c88938991226baa38ac7c4"
+
 [[package]]
 name = "typenum"
 version = "1.17.0"
@@ -1716,15 +4509,6 @@ version = "1.0.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
 
-[[package]]
-name = "unicode-normalization"
-version = "0.1.23"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a56d1686db2308d901306f92a263857ef59ea39678a5458e7cb17f01415101f5"
-dependencies = [
- "tinyvec",
-]
-
 [[package]]
 name = "universal-hash"
 version = "0.5.1"
@@ -1741,11 +4525,17 @@ version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a156c684c91ea7d62626509bce3cb4e1d9ed5c4d978f7b4352658f96a4c26b4a"
 
+[[package]]
+name = "untrusted"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8ecb6da28b8a351d773b68d5825ac39017e680750f980f3a1a85cd8dd28a47c1"
+
 [[package]]
 name = "uuid"
-version = "1.8.0"
+version = "1.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a183cf7feeba97b4dd1c0d46788634f6221d87fa961b305bed08c851829efcc0"
+checksum = "81dfa00651efa65069b0b6b651f4aaa31ba9e3c3ce0137aaad053604ee7e0314"
 
 [[package]]
 name = "valuable"
@@ -1761,9 +4551,26 @@ checksum = "accd4ea62f7bb7a82fe23066fb0957d48ef677f6eeb8215f372f52e48bb32426"
 
 [[package]]
 name = "version_check"
-version = "0.9.4"
+version = "0.9.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a"
+
+[[package]]
+name = "visibility"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d674d135b4a8c1d7e813e2f8d1c9a58308aee4a680323066025e53132218bd91"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.72",
+]
+
+[[package]]
+name = "void"
+version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
+checksum = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
 
 [[package]]
 name = "walkdir"
@@ -1775,12 +4582,36 @@ dependencies = [
  "winapi-util",
 ]
 
+[[package]]
+name = "want"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bfa7760aed19e106de2c7c0b581b509f2f25d3dacaf737cb82ac61bc6d760b0e"
+dependencies = [
+ "try-lock",
+]
+
+[[package]]
+name = "wasi"
+version = "0.9.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
+
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
 
+[[package]]
+name = "wasix"
+version = "0.12.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c1fbb4ef9bbca0c1170e0b00dd28abc9e3b68669821600cad1caaed606583c6d"
+dependencies = [
+ "wasi 0.11.0+wasi-snapshot-preview1",
+]
+
 [[package]]
 name = "wasm-bindgen"
 version = "0.2.92"
@@ -1802,7 +4633,7 @@ dependencies = [
  "once_cell",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.72",
  "wasm-bindgen-shared",
 ]
 
@@ -1824,7 +4655,7 @@ checksum = "e94f17b526d0a461a191c78ea52bbce64071ed5c04c9ffe424dcb38f74171bb7"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.72",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
@@ -1835,6 +4666,12 @@ version = "0.2.92"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "af190c94f2773fdb3729c55b007a722abb5384da03bc0986df4c289bf5567e96"
 
+[[package]]
+name = "weak-table"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "323f4da9523e9a669e1eaf9c6e763892769b1d38c623913647bfdc1532fe4549"
+
 [[package]]
 name = "web-sys"
 version = "0.3.69"
@@ -1845,6 +4682,12 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "webpki-roots"
+version = "0.25.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5f20c57d8d7db6d3b86154206ae5d8fba62dd39573114de97c2cb0578251f8e1"
+
 [[package]]
 name = "which"
 version = "4.4.2"
@@ -1875,11 +4718,11 @@ checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
 
 [[package]]
 name = "winapi-util"
-version = "0.1.6"
+version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f29e6f9198ba0d26b4c9f07dbe6f9ed633e1f3d5b8b414090084349e46a52596"
+checksum = "4d4cc384e1e73b93bafa6fb4f1df8c41695c8a91cf9c4c64358067d15a7b6c6b"
 dependencies = [
- "winapi",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -1888,6 +4731,15 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 
+[[package]]
+name = "windows-core"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "33ab640c8d7e35bf8ba19b884ba838ceb4fba93a4e8c65a9059d08afcfc683d9"
+dependencies = [
+ "windows-targets 0.52.6",
+]
+
 [[package]]
 name = "windows-sys"
 version = "0.45.0"
@@ -1897,13 +4749,22 @@ dependencies = [
  "windows-targets 0.42.2",
 ]
 
+[[package]]
+name = "windows-sys"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "677d2418bec65e3338edb076e806bc1ec15693c5d0104683f2efe857f61056a9"
+dependencies = [
+ "windows-targets 0.48.5",
+]
+
 [[package]]
 name = "windows-sys"
 version = "0.52.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
 dependencies = [
- "windows-targets 0.52.5",
+ "windows-targets 0.52.6",
 ]
 
 [[package]]
@@ -1923,18 +4784,33 @@ dependencies = [
 
 [[package]]
 name = "windows-targets"
-version = "0.52.5"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a2fa6e2155d7247be68c096456083145c183cbbbc2764150dda45a87197940c"
+dependencies = [
+ "windows_aarch64_gnullvm 0.48.5",
+ "windows_aarch64_msvc 0.48.5",
+ "windows_i686_gnu 0.48.5",
+ "windows_i686_msvc 0.48.5",
+ "windows_x86_64_gnu 0.48.5",
+ "windows_x86_64_gnullvm 0.48.5",
+ "windows_x86_64_msvc 0.48.5",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6f0713a46559409d202e70e28227288446bf7841d3211583a4b53e3f6d96e7eb"
+checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
 dependencies = [
- "windows_aarch64_gnullvm 0.52.5",
- "windows_aarch64_msvc 0.52.5",
- "windows_i686_gnu 0.52.5",
+ "windows_aarch64_gnullvm 0.52.6",
+ "windows_aarch64_msvc 0.52.6",
+ "windows_i686_gnu 0.52.6",
  "windows_i686_gnullvm",
- "windows_i686_msvc 0.52.5",
- "windows_x86_64_gnu 0.52.5",
- "windows_x86_64_gnullvm 0.52.5",
- "windows_x86_64_msvc 0.52.5",
+ "windows_i686_msvc 0.52.6",
+ "windows_x86_64_gnu 0.52.6",
+ "windows_x86_64_gnullvm 0.52.6",
+ "windows_x86_64_msvc 0.52.6",
 ]
 
 [[package]]
@@ -1945,9 +4821,15 @@ checksum = "597a5118570b68bc08d8d59125332c54f1ba9d9adeedeef5b99b02ba2b0698f8"
 
 [[package]]
 name = "windows_aarch64_gnullvm"
-version = "0.52.5"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b38e32f0abccf9987a4e3079dfb67dcd799fb61361e53e2882c3cbaf0d905d8"
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7088eed71e8b8dda258ecc8bac5fb1153c5cffaf2578fc8ff5d61e23578d3263"
+checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
 
 [[package]]
 name = "windows_aarch64_msvc"
@@ -1957,9 +4839,15 @@ checksum = "e08e8864a60f06ef0d0ff4ba04124db8b0fb3be5776a5cd47641e942e58c4d43"
 
 [[package]]
 name = "windows_aarch64_msvc"
-version = "0.52.5"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc35310971f3b2dbbf3f0690a219f40e2d9afcf64f9ab7cc1be722937c26b4bc"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9985fd1504e250c615ca5f281c3f7a6da76213ebd5ccc9561496568a2752afb6"
+checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
 
 [[package]]
 name = "windows_i686_gnu"
@@ -1969,15 +4857,21 @@ checksum = "c61d927d8da41da96a81f029489353e68739737d3beca43145c8afec9a31a84f"
 
 [[package]]
 name = "windows_i686_gnu"
-version = "0.52.5"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a75915e7def60c94dcef72200b9a8e58e5091744960da64ec734a6c6e9b3743e"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "88ba073cf16d5372720ec942a8ccbf61626074c6d4dd2e745299726ce8b89670"
+checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
 
 [[package]]
 name = "windows_i686_gnullvm"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "87f4261229030a858f36b459e748ae97545d6f1ec60e5e0d6a3d32e0dc232ee9"
+checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
 
 [[package]]
 name = "windows_i686_msvc"
@@ -1987,9 +4881,15 @@ checksum = "44d840b6ec649f480a41c8d80f9c65108b92d89345dd94027bfe06ac444d1060"
 
 [[package]]
 name = "windows_i686_msvc"
-version = "0.52.5"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f55c233f70c4b27f66c523580f78f1004e8b5a8b659e05a4eb49d4166cca406"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "db3c2bf3d13d5b658be73463284eaf12830ac9a26a90c717b7f771dfe97487bf"
+checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
 
 [[package]]
 name = "windows_x86_64_gnu"
@@ -1999,9 +4899,15 @@ checksum = "8de912b8b8feb55c064867cf047dda097f92d51efad5b491dfb98f6bbb70cb36"
 
 [[package]]
 name = "windows_x86_64_gnu"
-version = "0.52.5"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "53d40abd2583d23e4718fddf1ebec84dbff8381c07cae67ff7768bbf19c6718e"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4e4246f76bdeff09eb48875a0fd3e2af6aada79d409d33011886d3e1581517d9"
+checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
 
 [[package]]
 name = "windows_x86_64_gnullvm"
@@ -2011,9 +4917,15 @@ checksum = "26d41b46a36d453748aedef1486d5c7a85db22e56aff34643984ea85514e94a3"
 
 [[package]]
 name = "windows_x86_64_gnullvm"
-version = "0.52.5"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b7b52767868a23d5bab768e390dc5f5c55825b6d30b86c844ff2dc7414044cc"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "852298e482cd67c356ddd9570386e2862b5673c85bd5f88df9ab6802b334c596"
+checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
 
 [[package]]
 name = "windows_x86_64_msvc"
@@ -2023,9 +4935,24 @@ checksum = "9aec5da331524158c6d1a4ac0ab1541149c0b9505fde06423b02f5ef0106b9f0"
 
 [[package]]
 name = "windows_x86_64_msvc"
-version = "0.52.5"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
+
+[[package]]
+name = "winnow"
+version = "0.5.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bec47e5bfd1bff0eeaf6d8b485cc1074891a197ab4225d504cb7a1ab88b02bf0"
+checksum = "f593a95398737aeed53e489c785df13f3618e41dbcd6718c6addbf1395aa6876"
+dependencies = [
+ "memchr",
+]
 
 [[package]]
 name = "wyz"
@@ -2036,21 +4963,48 @@ dependencies = [
  "tap",
 ]
 
+[[package]]
+name = "x25519-dalek"
+version = "2.0.0-pre.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e5da623d8af10a62342bcbbb230e33e58a63255a58012f8653c578e54bab48df"
+dependencies = [
+ "curve25519-dalek",
+ "rand_core 0.6.4",
+ "zeroize",
+]
+
+[[package]]
+name = "x509-signature"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9fb2bc2a902d992cd5f471ee3ab0ffd6603047a4207384562755b9d6de977518"
+dependencies = [
+ "ring 0.16.20",
+ "untrusted 0.7.1",
+]
+
 [[package]]
 name = "xdg"
 version = "2.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "213b7324336b53d2414b2db8537e56544d981803139155afa84f76eeebb7a546"
 
+[[package]]
+name = "xz2"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "388c44dc09d76f1536602ead6d325eb532f5c122f17782bd57fb47baeeb767e2"
+dependencies = [
+ "lzma-sys",
+]
+
 [[package]]
 name = "zcash-android-wallet-sdk"
 version = "0.0.4"
 dependencies = [
  "anyhow",
  "dlopen2",
- "hdwallet",
- "hdwallet-bitcoin",
- "hex",
  "jni",
  "libc",
  "log-panics",
@@ -2059,12 +5013,13 @@ dependencies = [
  "prost",
  "rayon",
  "rusqlite",
+ "rust_decimal",
  "sapling-crypto",
- "schemer",
- "secp256k1",
  "secrecy",
+ "tor-rtcompat",
  "tracing",
  "tracing-subscriber",
+ "xz2",
  "zcash_address",
  "zcash_client_backend",
  "zcash_client_sqlite",
@@ -2074,9 +5029,9 @@ dependencies = [
 
 [[package]]
 name = "zcash_address"
-version = "0.3.2"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "827c17a1f7e3a69f0d44e991ff610c7a842228afdc9dc2325ffdd1a67fee01e9"
+checksum = "a6d26f21381dc220836dd8d2a9a10dbe85928a26232b011bc6a42b611789b743"
 dependencies = [
  "bech32",
  "bs58",
@@ -2087,20 +5042,26 @@ dependencies = [
 
 [[package]]
 name = "zcash_client_backend"
-version = "0.12.1"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0364e69c446fcf96a1f73f342c6c3fa697ea65ae7eeeae7d76ca847b9c442e40"
+checksum = "80e3a0f3e5d7f299d8b7ef3237697630989c31ab1b162824c99c1cd8bc83715e"
 dependencies = [
- "base64",
+ "arti-client",
+ "async-trait",
+ "base64 0.21.7",
  "bech32",
+ "bip32",
  "bls12_381",
  "bs58",
  "byteorder",
  "crossbeam-channel",
  "document-features",
+ "futures-util",
  "group",
- "hdwallet",
  "hex",
+ "http-body-util",
+ "hyper",
+ "hyper-util",
  "incrementalmerkletree",
  "memuse",
  "nom",
@@ -2108,15 +5069,24 @@ dependencies = [
  "orchard",
  "percent-encoding",
  "prost",
- "rand_core",
+ "rand 0.8.5",
+ "rand_core 0.6.4",
  "rayon",
+ "rust_decimal",
  "sapling-crypto",
  "secrecy",
+ "serde",
+ "serde_json",
  "shardtree",
  "subtle",
  "time",
+ "tokio",
+ "tokio-rustls",
  "tonic-build",
+ "tor-rtcompat",
+ "tower",
  "tracing",
+ "webpki-roots",
  "which",
  "zcash_address",
  "zcash_encoding",
@@ -2125,19 +5095,20 @@ dependencies = [
  "zcash_primitives",
  "zcash_protocol",
  "zip32",
+ "zip321",
 ]
 
 [[package]]
 name = "zcash_client_sqlite"
-version = "0.10.3"
+version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d2f94a5b293baca4b99be38695caa65a5e6981e8068f0bb80a69d60f4ee78346"
+checksum = "47e36ba9dfefa8024e893bc9d953300b45bcd0c131c1ba882d3286593be61e51"
 dependencies = [
+ "bip32",
  "bs58",
  "byteorder",
  "document-features",
  "group",
- "hdwallet",
  "incrementalmerkletree",
  "jubjub",
  "maybe-rayon",
@@ -2150,6 +5121,7 @@ dependencies = [
  "schemer-rusqlite",
  "secrecy",
  "shardtree",
+ "static_assertions",
  "subtle",
  "time",
  "tracing",
@@ -2165,9 +5137,9 @@ dependencies = [
 
 [[package]]
 name = "zcash_encoding"
-version = "0.2.0"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f03391b81727875efa6ac0661a20883022b6fba92365dc121c48fa9b00c5aac0"
+checksum = "052d8230202f0a018cd9b5d1b56b94cd25e18eccc2d8665073bcea8261ab87fc"
 dependencies = [
  "byteorder",
  "nonempty",
@@ -2175,22 +5147,22 @@ dependencies = [
 
 [[package]]
 name = "zcash_keys"
-version = "0.2.0"
+version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "663489ffb4e51bc4436ff8796832612a9ff3c6516f1c620b5a840cb5dcd7b866"
+checksum = "712faf4070107ab0b2828d0eda6aeaf4c3cb02564109832d95b97ad3467c95a5"
 dependencies = [
  "bech32",
+ "bip32",
  "blake2b_simd",
  "bls12_381",
  "bs58",
  "byteorder",
  "document-features",
  "group",
- "hdwallet",
  "memuse",
  "nonempty",
  "orchard",
- "rand_core",
+ "rand_core 0.6.4",
  "sapling-crypto",
  "secrecy",
  "subtle",
@@ -2211,39 +5183,39 @@ dependencies = [
  "chacha20",
  "chacha20poly1305",
  "cipher",
- "rand_core",
+ "rand_core 0.6.4",
  "subtle",
 ]
 
 [[package]]
 name = "zcash_primitives"
-version = "0.15.0"
+version = "0.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b5a8d812efec385ecbcefc862c0005bb1336474ea7dd9b671d5bbddaadd04be2"
+checksum = "5f044bc9cf2887ec408196fbafb44749e5581f57cc18d8da7aabaeb60cc40c64"
 dependencies = [
  "aes",
- "bip0039",
+ "bip32",
  "blake2b_simd",
+ "bs58",
  "byteorder",
  "document-features",
  "equihash",
  "ff",
  "fpe",
  "group",
- "hdwallet",
  "hex",
  "incrementalmerkletree",
  "jubjub",
  "memuse",
  "nonempty",
  "orchard",
- "rand",
- "rand_core",
+ "rand 0.8.5",
+ "rand_core 0.6.4",
  "redjubjub",
  "ripemd",
  "sapling-crypto",
  "secp256k1",
- "sha2",
+ "sha2 0.10.8",
  "subtle",
  "tracing",
  "zcash_address",
@@ -2256,9 +5228,9 @@ dependencies = [
 
 [[package]]
 name = "zcash_proofs"
-version = "0.15.0"
+version = "0.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5163a1110f4265cc5f2fdf87ac4497fd1e014b6ce0760ca8d16d8e3853a5c0f7"
+checksum = "3c579a5893ac140fab49cf73023ace91d51b441f37094bba5969c775526d8c1e"
 dependencies = [
  "bellman",
  "blake2b_simd",
@@ -2269,7 +5241,7 @@ dependencies = [
  "jubjub",
  "known-folders",
  "lazy_static",
- "rand_core",
+ "rand_core 0.6.4",
  "redjubjub",
  "sapling-crypto",
  "tracing",
@@ -2279,9 +5251,9 @@ dependencies = [
 
 [[package]]
 name = "zcash_protocol"
-version = "0.1.1"
+version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8f8189d4a304e8aa3aef3b75e89f3874bb0dc84b1cd623316a84e79e06cddabc"
+checksum = "f35eac659fdbba614333d119217c5963c0d7cea43aee33176c4f2f95e5460d8d"
 dependencies = [
  "document-features",
  "memuse",
@@ -2298,29 +5270,50 @@ dependencies = [
 
 [[package]]
 name = "zerocopy"
-version = "0.7.32"
+version = "0.6.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "854e949ac82d619ee9a14c66a1b674ac730422372ccb759ce0c39cabcf2bf8e6"
+dependencies = [
+ "byteorder",
+ "zerocopy-derive 0.6.6",
+]
+
+[[package]]
+name = "zerocopy"
+version = "0.7.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1b9b4fd18abc82b8136838da5d50bae7bdea537c574d8dc1a34ed098d6c166f0"
+dependencies = [
+ "zerocopy-derive 0.7.35",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.6.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74d4d3961e53fa4c9a25a8637fc2bfaf2595b3d3ae34875568a5cf64787716be"
+checksum = "125139de3f6b9d625c39e2efdd73d41bdac468ccd556556440e322be0e1bbd91"
 dependencies = [
- "zerocopy-derive",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.72",
 ]
 
 [[package]]
 name = "zerocopy-derive"
-version = "0.7.32"
+version = "0.7.35"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9ce1b18ccd8e73a9321186f97e46f9f04b778851177567b1975109d26a08d2a6"
+checksum = "fa4f8080344d4671fb4e831a13ad1e68092748387dfc4f55e356242fae12ce3e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.72",
 ]
 
 [[package]]
 name = "zeroize"
-version = "1.7.0"
+version = "1.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "525b4ec142c6b68a2d10f01f7bbf6755599ca3f81ea53b8431b7dd348f5fdb2d"
+checksum = "ced3678a2879b30306d323f4542626697a464a97c0a07c9aebf7ebca65cd4dde"
 dependencies = [
  "zeroize_derive",
 ]
@@ -2333,7 +5326,7 @@ checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.72",
 ]
 
 [[package]]
@@ -2346,3 +5339,44 @@ dependencies = [
  "memuse",
  "subtle",
 ]
+
+[[package]]
+name = "zip321"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8dc85f862f7be64fb0d46f9eb5b82ad54e58cde314fa979d5bae591bc0143693"
+dependencies = [
+ "base64 0.21.7",
+ "nom",
+ "percent-encoding",
+ "zcash_address",
+ "zcash_protocol",
+]
+
+[[package]]
+name = "zstd"
+version = "0.13.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fcf2b778a664581e31e389454a7072dab1647606d44f7feea22cd5abb9c9f3f9"
+dependencies = [
+ "zstd-safe",
+]
+
+[[package]]
+name = "zstd-safe"
+version = "7.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fa556e971e7b568dc775c136fc9de8c779b1c2fc3a63defaafadffdbd3181afa"
+dependencies = [
+ "zstd-sys",
+]
+
+[[package]]
+name = "zstd-sys"
+version = "2.0.12+zstd.1.5.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0a4e40c320c3cb459d9a9ff6de98cff88f4751ee9275d140e2be94a2b74e4c13"
+dependencies = [
+ "cc",
+ "pkg-config",
+]
diff --git a/backend-lib/Cargo.toml b/backend-lib/Cargo.toml
index 95311ab14..54f334a0a 100644
--- a/backend-lib/Cargo.toml
+++ b/backend-lib/Cargo.toml
@@ -8,24 +8,22 @@ authors = [
 description = "JNI backend for the Android wallet SDK"
 publish = false
 edition = "2018"
-rust-version = "1.77"
+rust-version = "1.80"
 
 [dependencies]
-hdwallet = "0.4"
-hdwallet-bitcoin = "0.4"
-hex = "0.4"
-orchard = "0.8"
-prost = "0.12"
+# Zcash dependencies
+orchard = "0.9"
+sapling = { package = "sapling-crypto", version = "0.2", default-features = false }
+zcash_address = "0.4"
+zcash_client_backend = { version = "0.13", features = ["orchard", "tor", "transparent-inputs", "unstable"] }
+zcash_client_sqlite = { version = "0.11", features = ["orchard", "transparent-inputs", "unstable"] }
+zcash_primitives = "0.16"
+zcash_proofs = "0.16"
+
+# Infrastructure
+prost = "0.13"
 rusqlite = "0.29"
-sapling = { package = "sapling-crypto", version = "0.1", default-features = false }
-schemer = "0.2"
-secp256k1 = "0.26"
 secrecy = "0.8"
-zcash_address = "0.3"
-zcash_client_backend = { version = "0.12.1", features = ["orchard", "transparent-inputs", "unstable"] }
-zcash_client_sqlite = { version = "0.10.3", features = ["orchard", "transparent-inputs", "unstable"] }
-zcash_primitives = "0.15"
-zcash_proofs = "0.15"
 
 # Initialization
 rayon = "1.7"
@@ -44,6 +42,12 @@ tracing-subscriber = "0.3"
 dlopen2 = "0.7"
 libc = "0.2"
 
+# Tor
+tor-rtcompat = "0.9"
+rust_decimal = { version = "1", default-features = false, features = ["c-repr"] }
+# - The "static" feature is required for the "compression" default feature of arti-client.
+xz2 = { version = "0.1", features = ["static"] }
+
 ## Uncomment this to test librustzcash changes locally
 #[patch.crates-io]
 #zcash_address = { path = '../../clones/librustzcash/components/zcash_address' }
diff --git a/backend-lib/src/main/java/cash/z/ecc/android/sdk/internal/Backend.kt b/backend-lib/src/main/java/cash/z/ecc/android/sdk/internal/Backend.kt
index 28172b62f..1e83d39a3 100644
--- a/backend-lib/src/main/java/cash/z/ecc/android/sdk/internal/Backend.kt
+++ b/backend-lib/src/main/java/cash/z/ecc/android/sdk/internal/Backend.kt
@@ -4,6 +4,7 @@ import cash.z.ecc.android.sdk.internal.model.JniBlockMeta
 import cash.z.ecc.android.sdk.internal.model.JniScanRange
 import cash.z.ecc.android.sdk.internal.model.JniScanSummary
 import cash.z.ecc.android.sdk.internal.model.JniSubtreeRoot
+import cash.z.ecc.android.sdk.internal.model.JniTransactionDataRequest
 import cash.z.ecc.android.sdk.internal.model.JniUnifiedSpendingKey
 import cash.z.ecc.android.sdk.internal.model.JniWalletSummary
 import cash.z.ecc.android.sdk.internal.model.ProposalUnsafe
@@ -24,13 +25,13 @@ interface Backend {
         account: Int,
         to: String,
         value: Long,
-        memo: ByteArray? = byteArrayOf()
+        memo: ByteArray? = null
     ): ProposalUnsafe
 
     suspend fun proposeShielding(
         account: Int,
         shieldingThreshold: Long,
-        memo: ByteArray? = byteArrayOf(),
+        memo: ByteArray? = null,
         transparentReceiver: String? = null
     ): ProposalUnsafe?
 
@@ -39,7 +40,14 @@ interface Backend {
         unifiedSpendingKey: ByteArray
     ): List<ByteArray>
 
-    suspend fun decryptAndStoreTransaction(tx: ByteArray)
+    /**
+     * @throws RuntimeException as a common indicator of the operation failure
+     */
+    @Throws(RuntimeException::class)
+    suspend fun decryptAndStoreTransaction(
+        tx: ByteArray,
+        minedHeight: Long?
+    )
 
     /**
      * Sets up the internal structure of the data database.
@@ -77,6 +85,12 @@ interface Backend {
 
     fun isValidUnifiedAddr(addr: String): Boolean
 
+    /**
+     * @throws RuntimeException as a common indicator of the operation failure
+     */
+    @Throws(RuntimeException::class)
+    fun isValidTexAddr(addr: String): Boolean
+
     @Throws(RuntimeException::class)
     suspend fun getCurrentAddress(account: Int): String
 
@@ -170,6 +184,12 @@ interface Backend {
         limit: Long
     ): JniScanSummary
 
+    /**
+     * @throws RuntimeException as a common indicator of the operation failure
+     */
+    @Throws(RuntimeException::class)
+    suspend fun transactionDataRequests(): List<JniTransactionDataRequest>
+
     /**
      * @throws RuntimeException as a common indicator of the operation failure
      */
@@ -200,4 +220,13 @@ interface Backend {
         value: Long,
         height: Long
     )
+
+    /**
+     * @throws RuntimeException as a common indicator of the operation failure
+     */
+    @Throws(RuntimeException::class)
+    suspend fun setTransactionStatus(
+        txId: ByteArray,
+        status: Long,
+    )
 }
diff --git a/backend-lib/src/main/java/cash/z/ecc/android/sdk/internal/jni/RustBackend.kt b/backend-lib/src/main/java/cash/z/ecc/android/sdk/internal/jni/RustBackend.kt
index 99d5dbdb3..ea6701c33 100644
--- a/backend-lib/src/main/java/cash/z/ecc/android/sdk/internal/jni/RustBackend.kt
+++ b/backend-lib/src/main/java/cash/z/ecc/android/sdk/internal/jni/RustBackend.kt
@@ -8,6 +8,7 @@ import cash.z.ecc.android.sdk.internal.model.JniBlockMeta
 import cash.z.ecc.android.sdk.internal.model.JniScanRange
 import cash.z.ecc.android.sdk.internal.model.JniScanSummary
 import cash.z.ecc.android.sdk.internal.model.JniSubtreeRoot
+import cash.z.ecc.android.sdk.internal.model.JniTransactionDataRequest
 import cash.z.ecc.android.sdk.internal.model.JniUnifiedSpendingKey
 import cash.z.ecc.android.sdk.internal.model.JniWalletSummary
 import cash.z.ecc.android.sdk.internal.model.ProposalUnsafe
@@ -295,14 +296,26 @@ class RustBackend private constructor(
         }
     }
 
-    override suspend fun decryptAndStoreTransaction(tx: ByteArray) =
-        withContext(SdkDispatchers.DATABASE_IO) {
-            decryptAndStoreTransaction(
-                dataDbFile.absolutePath,
-                tx,
+    override suspend fun transactionDataRequests(): List<JniTransactionDataRequest> {
+        return withContext(SdkDispatchers.DATABASE_IO) {
+            transactionDataRequests(
+                dbDataPath = dataDbFile.absolutePath,
                 networkId = networkId
-            )
+            ).asList()
         }
+    }
+
+    override suspend fun decryptAndStoreTransaction(
+        tx: ByteArray,
+        minedHeight: Long?
+    ) = withContext(SdkDispatchers.DATABASE_IO) {
+        decryptAndStoreTransaction(
+            dataDbFile.absolutePath,
+            tx,
+            minedHeight = minedHeight ?: -1,
+            networkId = networkId
+        )
+    }
 
     override suspend fun proposeTransfer(
         account: Int,
@@ -317,7 +330,7 @@ class RustBackend private constructor(
                     account,
                     to,
                     value,
-                    memo ?: ByteArray(0),
+                    memo,
                     networkId = networkId,
                     useZip317Fees = IS_USE_ZIP_317_FEES
                 )
@@ -335,7 +348,7 @@ class RustBackend private constructor(
                 dataDbFile.absolutePath,
                 account,
                 shieldingThreshold,
-                memo ?: ByteArray(0),
+                memo,
                 transparentReceiver,
                 networkId = networkId,
                 useZip317Fees = IS_USE_ZIP_317_FEES
@@ -382,12 +395,26 @@ class RustBackend private constructor(
         )
     }
 
+    override suspend fun setTransactionStatus(
+        txId: ByteArray,
+        status: Long
+    ) = withContext(SdkDispatchers.DATABASE_IO) {
+        Companion.setTransactionStatus(
+            dataDbFile.absolutePath,
+            txId,
+            status,
+            networkId = networkId
+        )
+    }
+
     override fun isValidSaplingAddr(addr: String) = isValidSaplingAddress(addr, networkId = networkId)
 
     override fun isValidTransparentAddr(addr: String) = isValidTransparentAddress(addr, networkId = networkId)
 
     override fun isValidUnifiedAddr(addr: String) = isValidUnifiedAddress(addr, networkId = networkId)
 
+    override fun isValidTexAddr(addr: String) = isValidTexAddress(addr, networkId = networkId)
+
     override fun getBranchIdForHeight(height: Long): Long = branchIdForHeight(height, networkId = networkId)
 
     /**
@@ -507,6 +534,12 @@ class RustBackend private constructor(
             networkId: Int
         ): Boolean
 
+        @JvmStatic
+        private external fun isValidTexAddress(
+            addr: String,
+            networkId: Int
+        ): Boolean
+
         @JvmStatic
         private external fun getMemoAsUtf8(
             dbDataPath: String,
@@ -604,10 +637,25 @@ class RustBackend private constructor(
             networkId: Int
         ): JniScanSummary
 
+        @JvmStatic
+        private external fun transactionDataRequests(
+            dbDataPath: String,
+            networkId: Int
+        ): Array<JniTransactionDataRequest>
+
         @JvmStatic
         private external fun decryptAndStoreTransaction(
             dbDataPath: String,
             tx: ByteArray,
+            minedHeight: Long,
+            networkId: Int
+        )
+
+        @JvmStatic
+        private external fun setTransactionStatus(
+            dbDataPath: String,
+            txId: ByteArray,
+            status: Long,
             networkId: Int
         )
 
@@ -618,7 +666,7 @@ class RustBackend private constructor(
             account: Int,
             to: String,
             value: Long,
-            memo: ByteArray,
+            memo: ByteArray?,
             networkId: Int,
             useZip317Fees: Boolean
         ): ByteArray
@@ -629,7 +677,7 @@ class RustBackend private constructor(
             dbDataPath: String,
             account: Int,
             shieldingThreshold: Long,
-            memo: ByteArray,
+            memo: ByteArray?,
             transparentReceiver: String?,
             networkId: Int,
             useZip317Fees: Boolean
diff --git a/backend-lib/src/main/java/cash/z/ecc/android/sdk/internal/model/JniTransactionDataRequest.kt b/backend-lib/src/main/java/cash/z/ecc/android/sdk/internal/model/JniTransactionDataRequest.kt
new file mode 100644
index 000000000..436d41d2f
--- /dev/null
+++ b/backend-lib/src/main/java/cash/z/ecc/android/sdk/internal/model/JniTransactionDataRequest.kt
@@ -0,0 +1,40 @@
+package cash.z.ecc.android.sdk.internal.model
+
+import androidx.annotation.Keep
+import cash.z.ecc.android.sdk.internal.ext.isInUIntRange
+
+/**
+ * Serves as cross layer (Kotlin, Rust) communication class.
+ */
+@Keep
+sealed class JniTransactionDataRequest {
+    @Keep
+    class GetStatus(val txid: ByteArray) : JniTransactionDataRequest()
+
+    @Keep
+    class Enhancement(val txid: ByteArray) : JniTransactionDataRequest()
+
+    @Keep
+    data class SpendsFromAddress(
+        val address: String,
+        val startHeight: Long,
+        val endHeight: Long,
+    ) : JniTransactionDataRequest() {
+        init {
+            // We require some of the parameters below to be in the range of unsigned integer, because of the Rust layer
+            // implementation.
+            require(startHeight.isInUIntRange()) {
+                "Height $startHeight is outside of allowed UInt range"
+            }
+            // We use -1L to represent None across JNI.
+            if (endHeight != -1L) {
+                require(endHeight.isInUIntRange()) {
+                    "Height $endHeight is outside of allowed UInt range"
+                }
+                require(endHeight >= startHeight) {
+                    "End height $endHeight must be greater than start height $startHeight."
+                }
+            }
+        }
+    }
+}
diff --git a/backend-lib/src/main/java/cash/z/ecc/android/sdk/internal/model/TorClient.kt b/backend-lib/src/main/java/cash/z/ecc/android/sdk/internal/model/TorClient.kt
new file mode 100644
index 000000000..53f517572
--- /dev/null
+++ b/backend-lib/src/main/java/cash/z/ecc/android/sdk/internal/model/TorClient.kt
@@ -0,0 +1,61 @@
+package cash.z.ecc.android.sdk.internal.model
+
+import cash.z.ecc.android.sdk.internal.ext.existsSuspend
+import cash.z.ecc.android.sdk.internal.ext.mkdirsSuspend
+import cash.z.ecc.android.sdk.internal.jni.RustBackend
+import dalvik.annotation.optimization.CriticalNative
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import java.io.File
+import java.math.BigDecimal
+
+class TorClient private constructor(
+    private val nativeHandle: Long?,
+) {
+    suspend fun dispose() =
+        withContext(Dispatchers.IO) {
+            nativeHandle?.let { freeTorRuntime(it) }
+        }
+
+    suspend fun getExchangeRateUsd(): BigDecimal =
+        withContext(Dispatchers.IO) {
+            getExchangeRateUsd(nativeHandle!!)
+        }
+
+    companion object {
+        suspend fun new(torDir: File): TorClient =
+            withContext(Dispatchers.IO) {
+                RustBackend.loadLibrary()
+
+                // Ensure that the directory exists.
+                torDir.mkdirsSuspend()
+                if (!torDir.existsSuspend()) {
+                    error("${torDir.path} directory does not exist and could not be created.")
+                }
+
+                TorClient(createTorRuntime(torDir.path))
+            }
+
+        //
+        // External Functions
+        //
+
+        /**
+         * @throws RuntimeException as a common indicator of the operation failure
+         */
+        @JvmStatic
+        @Throws(RuntimeException::class)
+        private external fun createTorRuntime(torDir: String): Long
+
+        @CriticalNative
+        @JvmStatic
+        private external fun freeTorRuntime(nativeHandle: Long)
+
+        /**
+         * @throws RuntimeException as a common indicator of the operation failure
+         */
+        @JvmStatic
+        @Throws(RuntimeException::class)
+        private external fun getExchangeRateUsd(nativeHandle: Long): BigDecimal
+    }
+}
diff --git a/backend-lib/src/main/rust/lib.rs b/backend-lib/src/main/rust/lib.rs
index 560dd38d0..97379a286 100644
--- a/backend-lib/src/main/rust/lib.rs
+++ b/backend-lib/src/main/rust/lib.rs
@@ -14,10 +14,12 @@ use jni::{
 };
 use prost::Message;
 use secrecy::{ExposeSecret, SecretVec};
+use tor_rtcompat::BlockOn;
 use tracing::{debug, error};
 use tracing_subscriber::prelude::*;
 use tracing_subscriber::reload;
 use zcash_address::{ToAddress, ZcashAddress};
+use zcash_client_backend::data_api::{TransactionDataRequest, TransactionStatus};
 use zcash_client_backend::{
     address::{Address, UnifiedAddress},
     data_api::{
@@ -34,6 +36,7 @@ use zcash_client_backend::{
     fees::{standard::SingleOutputChangeStrategy, DustOutputPolicy},
     keys::{DecodingError, Era, UnifiedAddressRequest, UnifiedFullViewingKey, UnifiedSpendingKey},
     proto::{proposal::Proposal, service::TreeState},
+    tor::http::cryptex,
     wallet::{NoteId, OvkPolicy, WalletTransparentOutput},
     zip321::{Payment, TransactionRequest},
     ShieldedProtocol,
@@ -48,7 +51,7 @@ use zcash_primitives::{
     consensus::{
         BlockHeight, BranchId, Network,
         Network::{MainNetwork, TestNetwork},
-        Parameters,
+        NetworkType, Parameters,
     },
     legacy::{Script, TransparentAddress},
     memo::{Memo, MemoBytes},
@@ -64,6 +67,7 @@ use zcash_proofs::prover::LocalTxProver;
 
 use crate::utils::{catch_unwind, exception::unwrap_exc_or};
 
+mod tor;
 mod utils;
 
 const ANCHOR_OFFSET_U32: u32 = 10;
@@ -104,7 +108,7 @@ fn account_id_from_jint(account: jint) -> anyhow::Result<zip32::AccountId> {
         .map_err(|_| anyhow!("Invalid account ID"))
 }
 
-fn account_id_from_jni<'local, P: Parameters>(
+fn account_id_from_jni<P: Parameters>(
     db_data: &WalletDb<rusqlite::Connection, P>,
     account_index: jint,
 ) -> anyhow::Result<AccountId> {
@@ -366,7 +370,7 @@ pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_createAcc
         let account = db_data.get_account(account_id)?.expect("just created");
         let account_index = match account.source() {
             AccountSource::Derived { account_index, .. } => account_index,
-            AccountSource::Imported => unreachable!("just created"),
+            AccountSource::Imported { .. } => unreachable!("just created"),
         };
 
         Ok(encode_usk(env, account_index, usk)?.into_raw())
@@ -723,7 +727,7 @@ pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_isValidSa
         match Address::decode(&network, &addr) {
             Some(addr) => match addr {
                 Address::Sapling(_) => Ok(JNI_TRUE),
-                Address::Transparent(_) | Address::Unified(_) => Ok(JNI_FALSE),
+                Address::Transparent(_) | Address::Unified(_) | Address::Tex(_) => Ok(JNI_FALSE),
             },
             None => Err(anyhow!("Address is for the wrong network")),
         }
@@ -747,7 +751,7 @@ pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_isValidTr
 
         match Address::decode(&network, &addr) {
             Some(addr) => match addr {
-                Address::Sapling(_) | Address::Unified(_) => Ok(JNI_FALSE),
+                Address::Sapling(_) | Address::Unified(_) | Address::Tex(_) => Ok(JNI_FALSE),
                 Address::Transparent(_) => Ok(JNI_TRUE),
             },
             None => Err(anyhow!("Address is for the wrong network")),
@@ -773,7 +777,32 @@ pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_isValidUn
         match Address::decode(&network, &addr) {
             Some(addr) => match addr {
                 Address::Unified(_) => Ok(JNI_TRUE),
-                Address::Sapling(_) | Address::Transparent(_) => Ok(JNI_FALSE),
+                Address::Sapling(_) | Address::Transparent(_) | Address::Tex(_) => Ok(JNI_FALSE),
+            },
+            None => Err(anyhow!("Address is for the wrong network")),
+        }
+    });
+    unwrap_exc_or(&mut env, res, JNI_FALSE)
+}
+
+#[no_mangle]
+pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_isValidTexAddress<'local>(
+    mut env: JNIEnv<'local>,
+    _: JClass<'local>,
+    addr: JString<'local>,
+    network_id: jint,
+) -> jboolean {
+    let res = catch_unwind(&mut env, |env| {
+        let _span = tracing::info_span!("RustBackend.isValidTexAddress").entered();
+        let network = parse_network(network_id as u32)?;
+        let addr = utils::java_string_to_rust(env, &addr);
+
+        match Address::decode(&network, &addr) {
+            Some(addr) => match addr {
+                Address::Sapling(_) | Address::Transparent(_) | Address::Unified(_) => {
+                    Ok(JNI_FALSE)
+                }
+                Address::Tex(_) => Ok(JNI_TRUE),
             },
             None => Err(anyhow!("Address is for the wrong network")),
         }
@@ -800,17 +829,17 @@ pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_getTotalT
 
         let min_confirmations = NonZeroU32::new(1).unwrap();
 
-        let amount = (&db_data)
+        let amount = db_data
             .get_target_and_anchor_heights(min_confirmations)
-            .map_err(|e| anyhow!("Error while fetching anchor height: {}", e))
-            .and_then(|opt_anchor| {
-                opt_anchor
-                    .map(|(target, _)| target) // Include unconfirmed funds.
-                    .ok_or(anyhow!("Anchor height not available; scan required."))
+            .map_err(|e| anyhow!("Error while fetching target height: {}", e))
+            .and_then(|opt_target| {
+                opt_target
+                    .map(|(target, _)| target)
+                    .ok_or(anyhow!("Target height not available; scan required."))
             })
-            .and_then(|anchor| {
-                (&db_data)
-                    .get_unspent_transparent_outputs(&taddr, anchor, &[])
+            .and_then(|target| {
+                db_data
+                    .get_spendable_transparent_outputs(&taddr, target, 0)
                     .map_err(|e| anyhow!("Error while fetching verified balance: {}", e))
             })?
             .iter()
@@ -853,7 +882,7 @@ pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_getMemoAs
             .ok_or(anyhow!("Shielded protocol not recognized: {}", pool_type))?;
         let output_index = u16::try_from(output_index)?;
 
-        let memo = (&db_data)
+        let memo = db_data
             .get_memo(NoteId::new(txid, protocol, output_index))
             .map_err(|e| anyhow!("An error occurred retrieving the memo, {}", e))
             .and_then(|memo| match memo {
@@ -1041,12 +1070,9 @@ pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_getNeares
             match db_data.get_min_unspent_height() {
                 Ok(Some(best_height)) => {
                     let first_unspent_note_height = u32::from(best_height);
-                    Ok(std::cmp::min(
-                        first_unspent_note_height as i64,
-                        height as i64,
-                    ))
+                    Ok(std::cmp::min(first_unspent_note_height as i64, height))
                 }
-                Ok(None) => Ok(height as i64),
+                Ok(None) => Ok(height),
                 Err(e) => Err(anyhow!(
                     "Error while getting nearest rewind height for {}: {}",
                     height,
@@ -1093,7 +1119,7 @@ fn decode_subtree_root<H>(
 
     fn byte_array(env: &mut JNIEnv, obj: &JObject, name: &str) -> anyhow::Result<Vec<u8>> {
         let field = JByteArray::from(env.get_field(obj, name, "[B")?.l()?);
-        Ok(env.convert_byte_array(field)?[..].try_into()?)
+        Ok(env.convert_byte_array(field)?)
     }
 
     Ok(CommitmentTreeRoot::from_parts(
@@ -1294,7 +1320,7 @@ fn encode_wallet_summary<'a, P: Parameters>(
         env,
         summary
             .account_balances()
-            .into_iter()
+            .iter()
             .map(|(account_id, balance)| {
                 let account_index = match db_data
                     .get_account(*account_id)?
@@ -1302,7 +1328,9 @@ fn encode_wallet_summary<'a, P: Parameters>(
                     .source()
                 {
                     AccountSource::Derived { account_index, .. } => account_index,
-                    AccountSource::Imported => unreachable!("Imported accounts are unimplemented"),
+                    AccountSource::Imported { .. } => {
+                        unreachable!("Imported accounts are unimplemented")
+                    }
                 };
                 Ok::<_, anyhow::Error>((account_index, balance))
             })
@@ -1475,6 +1503,87 @@ pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_scanBlock
     unwrap_exc_or(&mut env, res, ptr::null_mut())
 }
 
+fn encode_transaction_data_request<'a>(
+    env: &mut JNIEnv<'a>,
+    net: NetworkType,
+    transaction_data_request: TransactionDataRequest,
+) -> jni::errors::Result<JObject<'a>> {
+    match transaction_data_request {
+        TransactionDataRequest::GetStatus(txid) => env.new_object(
+            "cash/z/ecc/android/sdk/internal/model/JniTransactionDataRequest$GetStatus",
+            "([B)V",
+            &[(&env.byte_array_from_slice(txid.as_ref())?).into()],
+        ),
+        TransactionDataRequest::Enhancement(txid) => env.new_object(
+            "cash/z/ecc/android/sdk/internal/model/JniTransactionDataRequest$Enhancement",
+            "([B)V",
+            &[(&env.byte_array_from_slice(txid.as_ref())?).into()],
+        ),
+        TransactionDataRequest::SpendsFromAddress {
+            address,
+            block_range_start,
+            block_range_end,
+        } => {
+            let taddr = match address {
+                TransparentAddress::PublicKeyHash(data) => {
+                    ZcashAddress::from_transparent_p2pkh(net, data)
+                }
+                TransparentAddress::ScriptHash(data) => {
+                    ZcashAddress::from_transparent_p2sh(net, data)
+                }
+            };
+
+            env.new_object(
+                "cash/z/ecc/android/sdk/internal/model/JniTransactionDataRequest$SpendsFromAddress",
+                "(Ljava/lang/String;JJ)V",
+                &[
+                    (&env.new_string(taddr.encode())?).into(),
+                    JValue::Long(i64::from(u32::from(block_range_start))),
+                    JValue::Long(block_range_end.map(u32::from).map(i64::from).unwrap_or(-1)),
+                ],
+            )
+        }
+    }
+}
+
+#[no_mangle]
+pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_transactionDataRequests<
+    'local,
+>(
+    mut env: JNIEnv<'local>,
+    _: JClass<'local>,
+    db_data: JString<'local>,
+    network_id: jint,
+) -> jobjectArray {
+    let res = catch_unwind(&mut env, |env| {
+        let _span = tracing::info_span!("RustBackend.transactionDataRequests").entered();
+        let network = parse_network(network_id as u32)?;
+        let db_data = wallet_db(env, network, db_data)?;
+
+        let ranges = db_data
+            .transaction_data_requests()
+            .map_err(|e| anyhow!("Error while fetching transaction data requests: {}", e))?;
+
+        let net = network.network_type();
+
+        Ok(utils::rust_vec_to_java(
+            env,
+            ranges,
+            "cash/z/ecc/android/sdk/internal/model/JniTransactionDataRequest",
+            |env, request| encode_transaction_data_request(env, net, request),
+            |env| {
+                encode_transaction_data_request(
+                    env,
+                    net,
+                    TransactionDataRequest::GetStatus(TxId::from_bytes([0; 32])),
+                )
+            },
+        )?
+        .into_raw())
+    });
+    unwrap_exc_or(&mut env, res, ptr::null_mut())
+}
+
 #[no_mangle]
 pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_putUtxo<'local>(
     mut env: JNIEnv<'local>,
@@ -1510,7 +1619,7 @@ pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_putUtxo<'
                     .map_err(|_| anyhow!("Invalid UTXO value"))?,
                 script_pubkey,
             },
-            BlockHeight::from(height as u32),
+            Some(BlockHeight::from(height as u32)),
         )
         .ok_or_else(|| anyhow!("UTXO is not P2PKH or P2SH"))?;
 
@@ -1531,6 +1640,7 @@ pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_decryptAn
     _: JClass<'local>,
     db_data: JString<'local>,
     tx: JByteArray<'local>,
+    mined_height: jlong,
     network_id: jint,
 ) -> jboolean {
     let res = catch_unwind(&mut env, |env| {
@@ -1545,8 +1655,9 @@ pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_decryptAn
         // - v5 and above transactions ignore the argument, and parse the correct value
         //   from their encoding.
         let tx = Transaction::read(&tx_bytes[..], BranchId::Sapling)?;
+        let mined_height = BlockHeight::try_from(mined_height).ok();
 
-        match decrypt_and_store_transaction(&network, &mut db_data, &tx) {
+        match decrypt_and_store_transaction(&network, &mut db_data, &tx, mined_height) {
             Ok(()) => Ok(JNI_TRUE),
             Err(e) => Err(anyhow!("Error while decrypting transaction: {}", e)),
         }
@@ -1555,6 +1666,38 @@ pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_decryptAn
     unwrap_exc_or(&mut env, res, JNI_FALSE)
 }
 
+#[no_mangle]
+pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_setTransactionStatus<
+    'local,
+>(
+    mut env: JNIEnv<'local>,
+    _: JClass<'local>,
+    db_data: JString<'local>,
+    txid_bytes: JByteArray<'local>,
+    status: jlong,
+    network_id: jint,
+) -> jboolean {
+    let res = catch_unwind(&mut env, |env| {
+        let _span = tracing::info_span!("RustBackend.setTransactionStatus").entered();
+        let network = parse_network(network_id as u32)?;
+        let mut db_data = wallet_db(env, network, db_data)?;
+        let txid_bytes = env.convert_byte_array(txid_bytes)?;
+        let txid = TxId::read(&txid_bytes[..])?;
+        let status = match status {
+            -2 => TransactionStatus::TxidNotRecognized,
+            -1 => TransactionStatus::NotInMainChain,
+            height => TransactionStatus::Mined(BlockHeight::try_from(height)?),
+        };
+
+        match db_data.set_transaction_status(txid, status) {
+            Ok(()) => Ok(JNI_TRUE),
+            Err(e) => Err(anyhow!("Error while setting transaction status: {}", e)),
+        }
+    });
+
+    unwrap_exc_or(&mut env, res, JNI_FALSE)
+}
+
 fn zip317_helper<DbT>(
     change_memo: Option<MemoBytes>,
     use_zip317_fees: jboolean,
@@ -1591,36 +1734,27 @@ pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_proposeTr
         let to = utils::java_string_to_rust(env, &to);
         let value = NonNegativeAmount::from_nonnegative_i64(value)
             .map_err(|_| anyhow!("Invalid amount, out of range"))?;
-        let memo_bytes = env.convert_byte_array(memo).unwrap();
 
-        let to = match Address::decode(&network, &to) {
-            Some(to) => to,
-            None => {
-                return Err(anyhow!("Address is for the wrong network"));
-            }
-        };
+        let to = to
+            .parse()
+            .map_err(|e| anyhow!("Can't parse recipient address: {}", e))?;
 
-        // TODO: consider warning in this case somehow, rather than swallowing this error
-        let memo = match to {
-            Address::Sapling(_) | Address::Unified(_) => {
-                let memo_value =
-                    Memo::from_bytes(&memo_bytes).map_err(|_| anyhow!("Invalid memo"))?;
-                Some(MemoBytes::from(&memo_value))
-            }
-            Address::Transparent(_) => None,
+        let memo = if memo.is_null() {
+            None
+        } else {
+            MemoBytes::from_bytes(&env.convert_byte_array(memo)?)
+                .map(Some)
+                .map_err(|e| anyhow!("Invalid MemoBytes: {}", e))?
         };
 
         let input_selector = zip317_helper(None, use_zip317_fees);
 
-        let request = TransactionRequest::new(vec![Payment {
-            recipient_address: to,
-            amount: value,
-            memo,
-            label: None,
-            message: None,
-            other_params: vec![],
-        }])
-        .map_err(|e| anyhow!("Error creating transaction request: {:?}", e))?;
+        let request =
+            TransactionRequest::new(vec![Payment::new(to, value, memo, None, None, vec![])
+                .ok_or_else(|| {
+                    anyhow!("Memos are not permitted when sending to transparent recipients.")
+                })?])
+            .map_err(|e| anyhow!("Error creating transaction request: {:?}", e))?;
 
         let proposal = propose_transfer::<_, _, _, Infallible>(
             &mut db_data,
@@ -1633,8 +1767,8 @@ pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_proposeTr
         .map_err(|e| anyhow!("Error creating transaction proposal: {}", e))?;
 
         Ok(utils::rust_bytes_to_java(
-            &env,
-            Proposal::from_standard_proposal(&network, &proposal)
+            env,
+            Proposal::from_standard_proposal(&proposal)
                 .encode_to_vec()
                 .as_ref(),
         )?
@@ -1662,7 +1796,6 @@ pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_proposeSh
         let account = account_id_from_jni(&db_data, account)?;
         let shielding_threshold = NonNegativeAmount::from_nonnegative_i64(shielding_threshold)
             .map_err(|_| anyhow!("Invalid shielding threshold, out of range"))?;
-        let memo_bytes = env.convert_byte_array(memo).unwrap();
 
         let transparent_receiver =
             match utils::java_nullable_string_to_rust(env, &transparent_receiver) {
@@ -1670,7 +1803,7 @@ pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_proposeSh
                 Some(addr) => match Address::decode(&network, &addr) {
                     None => Err(anyhow!("Transparent receiver is for the wrong network")),
                     Some(addr) => match addr {
-                        Address::Sapling(_) | Address::Unified(_) => {
+                        Address::Sapling(_) | Address::Unified(_) | Address::Tex(_) => {
                             Err(anyhow!("Transparent receiver is not a transparent address"))
                         }
                         Address::Transparent(addr) => {
@@ -1719,16 +1852,22 @@ pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_proposeSh
                 Ok(account_receivers.iter().next().map(|(a, v)| (*a, *v)))
             },
             |addr| Ok(account_receivers.get(&addr).map(|value| (addr, *value)))
-        )?.filter(|(_, value)| *value >= shielding_threshold.into()) {
+        )?.filter(|(_, value)| *value >= shielding_threshold) {
             [addr]
         } else {
             // There are no transparent funds to shield; don't create a proposal.
             return Ok(ptr::null_mut());
         };
 
-        let memo = Memo::from_bytes(&memo_bytes).unwrap();
+        let memo = if memo.is_null() {
+            None
+        } else {
+            MemoBytes::from_bytes(&env.convert_byte_array(memo)?)
+                .map(Some)
+                .map_err(|e| anyhow!("Invalid MemoBytes: {}", e))?
+        };
 
-        let input_selector = zip317_helper(Some(MemoBytes::from(&memo)), use_zip317_fees);
+        let input_selector = zip317_helper(memo, use_zip317_fees);
 
         let proposal = propose_shielding::<_, _, _, Infallible>(
             &mut db_data,
@@ -1741,8 +1880,8 @@ pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_proposeSh
         .map_err(|e| anyhow!("Error while shielding transaction: {}", e))?;
 
         Ok(utils::rust_bytes_to_java(
-            &env,
-            Proposal::from_standard_proposal(&network, &proposal)
+            env,
+            Proposal::from_standard_proposal(&proposal)
                 .encode_to_vec()
                 .as_ref(),
         )?
@@ -1768,7 +1907,7 @@ pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_createPro
         let _span = tracing::info_span!("RustBackend.createProposedTransaction").entered();
         let network = parse_network(network_id as u32)?;
         let mut db_data = wallet_db(env, network, db_data)?;
-        let usk = decode_usk(&env, usk)?;
+        let usk = decode_usk(env, usk)?;
         let spend_params = utils::java_string_to_rust(env, &spend_params);
         let output_params = utils::java_string_to_rust(env, &output_params);
 
@@ -1776,7 +1915,7 @@ pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_createPro
 
         let proposal = Proposal::decode(&env.convert_byte_array(proposal)?[..])
             .map_err(|e| anyhow!("Invalid proposal: {}", e))?
-            .try_into_standard_proposal(&network, &db_data)?;
+            .try_into_standard_proposal(&db_data)?;
 
         let txids = create_proposed_transactions::<_, _, Infallible, _, _>(
             &mut db_data,
@@ -1822,6 +1961,79 @@ pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_branchIdF
     unwrap_exc_or(&mut env, res, -1)
 }
 
+//
+// Tor support
+//
+
+/// Creates a Tor runtime
+#[no_mangle]
+pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_model_TorClient_createTorRuntime<'local>(
+    mut env: JNIEnv<'local>,
+    _: JClass<'local>,
+    tor_dir: JString<'local>,
+) -> jlong {
+    let res = catch_unwind(&mut env, |env| {
+        let tor_dir = utils::java_string_to_rust(env, &tor_dir);
+        let tor_dir = Path::new(&tor_dir);
+
+        let tor = crate::tor::TorRuntime::create(tor_dir)?;
+
+        Ok((Box::into_raw(Box::new(tor)) as usize) as jlong)
+    });
+    unwrap_exc_or(&mut env, res, -1)
+}
+
+/// Frees a Tor runtime.
+#[no_mangle]
+pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_model_TorClient_freeTorRuntime(ptr: jlong) {
+    let ptr = (ptr as usize) as *mut crate::tor::TorRuntime;
+    if !ptr.is_null() {
+        let s = unsafe { Box::from_raw(ptr) };
+        drop(s);
+    }
+}
+
+/// Fetches the current ZEC-USD exchange rate over Tor.
+#[no_mangle]
+pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_model_TorClient_getExchangeRateUsd<
+    'local,
+>(
+    mut env: JNIEnv<'local>,
+    _: JClass<'local>,
+    tor_runtime: jlong,
+) -> jobject {
+    let res = catch_unwind(&mut env, |env| {
+        let tor_runtime =
+            unsafe { ((tor_runtime as usize) as *mut crate::tor::TorRuntime).as_mut() }
+                .ok_or_else(|| anyhow!("A Tor runtime is required"))?;
+
+        let exchanges = cryptex::Exchanges::unauthenticated_known_with_gemini_trusted();
+
+        let rate = tor_runtime.runtime().block_on(async {
+            tor_runtime
+                .client()
+                .get_latest_zec_to_usd_rate(&exchanges)
+                .await
+        })?;
+
+        let mantissa = env.byte_array_from_slice(&rate.mantissa().to_be_bytes())?;
+        let unscaled_val =
+            env.new_object("java/math/BigInteger", "([B)V", &[(&mantissa).into()])?;
+
+        Ok(env
+            .new_object(
+                "java/math/BigDecimal",
+                "(Ljava/math/BigInteger;I)V",
+                &[
+                    JValue::Object(&unscaled_val),
+                    JValue::Int(rate.scale() as i32),
+                ],
+            )?
+            .into_raw())
+    });
+    unwrap_exc_or(&mut env, res, ptr::null_mut())
+}
+
 //
 // Utility functions
 //
@@ -1867,8 +2079,8 @@ pub extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_listTrans
         match db_data.get_transparent_receivers(account) {
             Ok(receivers) => {
                 let trasparent_receivers = receivers
-                    .iter()
-                    .map(|(taddr, _)| {
+                    .keys()
+                    .map(|taddr| {
                         let taddr = match taddr {
                             TransparentAddress::PublicKeyHash(data) => {
                                 ZcashAddress::from_transparent_p2pkh(zcash_network, *data)
diff --git a/backend-lib/src/main/rust/tor.rs b/backend-lib/src/main/rust/tor.rs
new file mode 100644
index 000000000..c1e5fde13
--- /dev/null
+++ b/backend-lib/src/main/rust/tor.rs
@@ -0,0 +1,28 @@
+//! Tor support
+
+use std::path::Path;
+
+use tor_rtcompat::{BlockOn, PreferredRuntime};
+use zcash_client_backend::tor::Client;
+
+pub struct TorRuntime {
+    runtime: PreferredRuntime,
+    client: Client,
+}
+
+impl TorRuntime {
+    #[tracing::instrument]
+    pub(crate) fn create(tor_dir: &Path) -> anyhow::Result<Self> {
+        let runtime = PreferredRuntime::create()?;
+        let client = runtime.block_on(async { Client::create(tor_dir).await })?;
+        Ok(Self { runtime, client })
+    }
+
+    pub(crate) fn runtime(&self) -> &PreferredRuntime {
+        &self.runtime
+    }
+
+    pub(crate) fn client(&self) -> &Client {
+        &self.client
+    }
+}
diff --git a/backend-lib/src/main/rust/utils/trace.rs b/backend-lib/src/main/rust/utils/trace.rs
index 1715c57eb..c54019656 100644
--- a/backend-lib/src/main/rust/utils/trace.rs
+++ b/backend-lib/src/main/rust/utils/trace.rs
@@ -32,18 +32,14 @@ impl Layer {
         }
     }
 
-    fn with_entered_span<S: Subscriber>(
-        &self,
-        id: &span::Id,
-        ctx: &Context<'_, S>,
-        f: impl FnOnce(&CString),
-    ) where
-        for<'lookup> S: LookupSpan<'lookup>,
+    fn with_entered_span<S>(&self, id: &span::Id, ctx: &Context<'_, S>, f: impl FnOnce(&CString))
+    where
+        for<'lookup> S: Subscriber + LookupSpan<'lookup>,
     {
         let mut open_spans = self.open_spans.lock().unwrap();
 
         if let Some(section_name) = open_spans.get_mut(id) {
-            f(&section_name);
+            f(section_name);
         } else {
             // We need to obtain the span's name as a CString.
             match ctx.metadata(id) {
diff --git a/demo-app/src/main/java/cash/z/ecc/android/sdk/demoapp/Navigation.kt b/demo-app/src/main/java/cash/z/ecc/android/sdk/demoapp/Navigation.kt
index a46b19f7b..ac3cf910e 100644
--- a/demo-app/src/main/java/cash/z/ecc/android/sdk/demoapp/Navigation.kt
+++ b/demo-app/src/main/java/cash/z/ecc/android/sdk/demoapp/Navigation.kt
@@ -118,6 +118,7 @@ internal fun ComposeActivity.Navigation() {
                     onRefresh = {
                         scope.launch {
                             (synchronizer as SdkSynchronizer).refreshAllBalances()
+                            synchronizer.refreshExchangeRateUsd()
                         }
                     }
                 )
diff --git a/demo-app/src/main/java/cash/z/ecc/android/sdk/demoapp/demos/getbalance/GetBalanceFragment.kt b/demo-app/src/main/java/cash/z/ecc/android/sdk/demoapp/demos/getbalance/GetBalanceFragment.kt
index 74686337f..4469f3576 100644
--- a/demo-app/src/main/java/cash/z/ecc/android/sdk/demoapp/demos/getbalance/GetBalanceFragment.kt
+++ b/demo-app/src/main/java/cash/z/ecc/android/sdk/demoapp/demos/getbalance/GetBalanceFragment.kt
@@ -14,7 +14,9 @@ import cash.z.ecc.android.sdk.demoapp.databinding.FragmentGetBalanceBinding
 import cash.z.ecc.android.sdk.demoapp.ext.requireApplicationContext
 import cash.z.ecc.android.sdk.demoapp.util.SyncBlockchainBenchmarkTrace
 import cash.z.ecc.android.sdk.demoapp.util.fromResources
+import cash.z.ecc.android.sdk.ext.convertZatoshiToZec
 import cash.z.ecc.android.sdk.ext.convertZatoshiToZecString
+import cash.z.ecc.android.sdk.ext.toUsdString
 import cash.z.ecc.android.sdk.internal.Twig
 import cash.z.ecc.android.sdk.model.Account
 import cash.z.ecc.android.sdk.model.PercentDecimal
@@ -23,9 +25,11 @@ import cash.z.ecc.android.sdk.model.Zatoshi
 import cash.z.ecc.android.sdk.model.ZcashNetwork
 import cash.z.ecc.android.sdk.tool.DerivationTool
 import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.filterNotNull
 import kotlinx.coroutines.flow.flatMapLatest
 import kotlinx.coroutines.launch
+import java.math.BigDecimal
 
 /**
  * Displays the available balance && total balance associated with the seed defined by the default config.
@@ -57,6 +61,16 @@ class GetBalanceFragment : BaseDemoFragment<FragmentGetBalanceBinding>() {
         val seed = Mnemonics.MnemonicCode(seedPhrase).toSeed()
         val network = ZcashNetwork.fromResources(requireApplicationContext())
 
+        binding.refreshExchangeRate.apply {
+            setOnClickListener {
+                lifecycleScope.launch {
+                    sharedViewModel.synchronizerFlow.value?.let { synchronizer ->
+                        synchronizer.refreshExchangeRateUsd()
+                    }
+                }
+            }
+        }
+
         binding.shield.apply {
             setOnClickListener {
                 lifecycleScope.launch {
@@ -81,6 +95,7 @@ class GetBalanceFragment : BaseDemoFragment<FragmentGetBalanceBinding>() {
         monitorChanges()
     }
 
+    @Suppress("LongMethod")
     @OptIn(ExperimentalCoroutinesApi::class)
     private fun monitorChanges() {
         viewLifecycleOwner.lifecycleScope.launch {
@@ -100,38 +115,63 @@ class GetBalanceFragment : BaseDemoFragment<FragmentGetBalanceBinding>() {
                 launch {
                     sharedViewModel.synchronizerFlow
                         .filterNotNull()
-                        .flatMapLatest { it.saplingBalances }
+                        .flatMapLatest {
+                            it.saplingBalances.combine(it.exchangeRateUsd) { b, r ->
+                                b?.let {
+                                    b to
+                                        r.currencyConversion
+                                            ?.priceOfZec
+                                            ?.toBigDecimal()
+                                }
+                            }
+                        }
                         .collect { onSaplingBalance(it) }
                 }
                 launch {
                     sharedViewModel.synchronizerFlow
                         .filterNotNull()
-                        .flatMapLatest { it.orchardBalances }
+                        .flatMapLatest {
+                            it.orchardBalances.combine(it.exchangeRateUsd) { b, r ->
+                                b?.let {
+                                    b to
+                                        r.currencyConversion?.priceOfZec?.toBigDecimal()
+                                }
+                            }
+                        }
                         .collect { onOrchardBalance(it) }
                 }
                 launch {
                     sharedViewModel.synchronizerFlow
                         .filterNotNull()
-                        .flatMapLatest { it.transparentBalance }
+                        .flatMapLatest {
+                            it.transparentBalance.combine(it.exchangeRateUsd) { b, r ->
+                                b?.let {
+                                    b to
+                                        r.currencyConversion
+                                            ?.priceOfZec
+                                            ?.toBigDecimal()
+                                }
+                            }
+                        }
                         .collect { onTransparentBalance(it) }
                 }
             }
         }
     }
 
-    private fun onOrchardBalance(orchardBalance: WalletBalance?) {
+    private fun onOrchardBalance(orchardBalance: Pair<WalletBalance, BigDecimal?>?) {
         binding.orchardBalance.apply {
-            text = orchardBalance.humanString()
+            text = orchardBalance.balanceHumanString()
         }
     }
 
-    private fun onSaplingBalance(saplingBalance: WalletBalance?) {
+    private fun onSaplingBalance(saplingBalance: Pair<WalletBalance, BigDecimal?>?) {
         binding.saplingBalance.apply {
-            text = saplingBalance.humanString()
+            text = saplingBalance.balanceHumanString()
         }
     }
 
-    private fun onTransparentBalance(transparentBalance: Zatoshi?) {
+    private fun onTransparentBalance(transparentBalance: Pair<Zatoshi, BigDecimal?>?) {
         binding.transparentBalance.apply {
             text = transparentBalance.humanString()
         }
@@ -140,7 +180,7 @@ class GetBalanceFragment : BaseDemoFragment<FragmentGetBalanceBinding>() {
             // This check is not entirely correct - it does not calculate the resulting fee with the new Proposal API
             // Note that the entire fragment-based old Demo app will be removed as part of [#973]
             visibility =
-                if ((transparentBalance ?: Zatoshi(0)).value > 0L) {
+                if ((transparentBalance?.first ?: Zatoshi(0)).value > 0L) {
                     View.VISIBLE
                 } else {
                     View.GONE
@@ -156,18 +196,21 @@ class GetBalanceFragment : BaseDemoFragment<FragmentGetBalanceBinding>() {
                 Synchronizer.Status.SYNCING -> {
                     SyncBlockchainBenchmarkTrace.Event.BLOCKCHAIN_SYNC_START
                 }
+
                 Synchronizer.Status.SYNCED -> {
                     SyncBlockchainBenchmarkTrace.Event.BLOCKCHAIN_SYNC_END
                 }
+
                 else -> null
             }
         traceEvents?.let { reportTraceEvent(it) }
 
         binding.textStatus.text = "Status: $status"
         sharedViewModel.synchronizerFlow.value?.let { synchronizer ->
-            onOrchardBalance(synchronizer.orchardBalances.value)
-            onSaplingBalance(synchronizer.saplingBalances.value)
-            onTransparentBalance(synchronizer.transparentBalance.value)
+            val rate = synchronizer.exchangeRateUsd.value.currencyConversion?.priceOfZec?.toBigDecimal()
+            onOrchardBalance(synchronizer.orchardBalances.value?.let { Pair(it, rate) })
+            onSaplingBalance(synchronizer.saplingBalances.value?.let { Pair(it, rate) })
+            onTransparentBalance(synchronizer.transparentBalance.value?.let { Pair(it, rate) })
         }
     }
 
@@ -180,23 +223,35 @@ class GetBalanceFragment : BaseDemoFragment<FragmentGetBalanceBinding>() {
 }
 
 @Suppress("MagicNumber")
-private fun WalletBalance?.humanString() =
+private fun Pair<WalletBalance, BigDecimal?>?.balanceHumanString() =
     if (null == this) {
         "Calculating balance"
     } else {
         """
-        Pending balance: ${pending.convertZatoshiToZecString(12)}
-        Available balance: ${available.convertZatoshiToZecString(12)}
-        Total balance: ${total.convertZatoshiToZecString(12)}
+        Pending balance: ${first.pending.convertZatoshiToZecString(12)} (${
+            second?.multiply(first.pending.convertZatoshiToZec())
+                .toUsdString()
+        } USD)
+        Available balance: ${first.available.convertZatoshiToZecString(12)} (${
+            second?.multiply(first.available.convertZatoshiToZec())
+                .toUsdString()
+        } USD)
+        Total balance: ${first.total.convertZatoshiToZecString(12)} (${
+            second?.multiply(first.total.convertZatoshiToZec())
+                .toUsdString()
+        } USD)
         """.trimIndent()
     }
 
 @Suppress("MagicNumber")
-private fun Zatoshi?.humanString() =
+private fun Pair<Zatoshi, BigDecimal?>?.humanString() =
     if (null == this) {
         "Calculating balance"
     } else {
         """
-        Balance: ${convertZatoshiToZecString(12)}
+        Balance: ${first.convertZatoshiToZecString(12)} (${
+            second?.multiply(first.convertZatoshiToZec())
+                .toUsdString()
+        } USD)
         """.trimIndent()
     }
diff --git a/demo-app/src/main/java/cash/z/ecc/android/sdk/demoapp/fixture/WalletSnapshotFixture.kt b/demo-app/src/main/java/cash/z/ecc/android/sdk/demoapp/fixture/WalletSnapshotFixture.kt
index bf313ff09..36f5a89dc 100644
--- a/demo-app/src/main/java/cash/z/ecc/android/sdk/demoapp/fixture/WalletSnapshotFixture.kt
+++ b/demo-app/src/main/java/cash/z/ecc/android/sdk/demoapp/fixture/WalletSnapshotFixture.kt
@@ -8,6 +8,7 @@ import cash.z.ecc.android.sdk.fixture.WalletBalanceFixture
 import cash.z.ecc.android.sdk.model.PercentDecimal
 import cash.z.ecc.android.sdk.model.WalletBalance
 import cash.z.ecc.android.sdk.model.Zatoshi
+import java.math.BigDecimal
 
 @Suppress("MagicNumber")
 object WalletSnapshotFixture {
@@ -16,6 +17,7 @@ object WalletSnapshotFixture {
     val TRANSPARENT_BALANCE: Zatoshi = Zatoshi(8)
     val ORCHARD_BALANCE: WalletBalance = WalletBalanceFixture.new(Zatoshi(5), Zatoshi(2), Zatoshi(1))
     val SAPLING_BALANCE: WalletBalance = WalletBalanceFixture.new(Zatoshi(4), Zatoshi(4), Zatoshi(2))
+    val EXCHANGE_RATE_USD: BigDecimal = BigDecimal(37.4850)
 
     // Should fill in with non-empty values for better example values in tests and UI previews
     @Suppress("LongParameterList")
@@ -30,6 +32,7 @@ object WalletSnapshotFixture {
         orchardBalance: WalletBalance = ORCHARD_BALANCE,
         saplingBalance: WalletBalance = SAPLING_BALANCE,
         transparentBalance: Zatoshi = TRANSPARENT_BALANCE,
+        exchangeRateUsd: BigDecimal? = EXCHANGE_RATE_USD,
         progress: PercentDecimal = PROGRESS,
         synchronizerError: SynchronizerError? = null
     ) = WalletSnapshot(
@@ -38,6 +41,7 @@ object WalletSnapshotFixture {
         orchardBalance,
         saplingBalance,
         transparentBalance,
+        exchangeRateUsd,
         progress,
         synchronizerError
     )
diff --git a/demo-app/src/main/java/cash/z/ecc/android/sdk/demoapp/ui/screen/balance/view/BalanceView.kt b/demo-app/src/main/java/cash/z/ecc/android/sdk/demoapp/ui/screen/balance/view/BalanceView.kt
index 85eccefc0..131de428f 100644
--- a/demo-app/src/main/java/cash/z/ecc/android/sdk/demoapp/ui/screen/balance/view/BalanceView.kt
+++ b/demo-app/src/main/java/cash/z/ecc/android/sdk/demoapp/ui/screen/balance/view/BalanceView.kt
@@ -26,6 +26,8 @@ import cash.z.ecc.android.sdk.demoapp.R
 import cash.z.ecc.android.sdk.demoapp.fixture.WalletSnapshotFixture
 import cash.z.ecc.android.sdk.demoapp.ui.screen.home.viewmodel.SendState
 import cash.z.ecc.android.sdk.demoapp.ui.screen.home.viewmodel.WalletSnapshot
+import cash.z.ecc.android.sdk.ext.convertZatoshiToZec
+import cash.z.ecc.android.sdk.ext.toUsdString
 import cash.z.ecc.android.sdk.model.toZecString
 
 @Preview(name = "Balance")
@@ -115,13 +117,17 @@ private fun BalanceMainContent(
         Text(
             stringResource(
                 id = R.string.balance_available_amount_format,
-                walletSnapshot.orchardBalance.available.toZecString()
+                walletSnapshot.orchardBalance.available.toZecString(),
+                walletSnapshot.exchangeRateUsd?.multiply(walletSnapshot.orchardBalance.available.convertZatoshiToZec())
+                    .toUsdString()
             )
         )
         Text(
             stringResource(
                 id = R.string.balance_pending_amount_format,
-                walletSnapshot.orchardBalance.pending.toZecString()
+                walletSnapshot.orchardBalance.pending.toZecString(),
+                walletSnapshot.exchangeRateUsd?.multiply(walletSnapshot.orchardBalance.pending.convertZatoshiToZec())
+                    .toUsdString()
             )
         )
 
@@ -131,13 +137,17 @@ private fun BalanceMainContent(
         Text(
             stringResource(
                 id = R.string.balance_available_amount_format,
-                walletSnapshot.saplingBalance.available.toZecString()
+                walletSnapshot.saplingBalance.available.toZecString(),
+                walletSnapshot.exchangeRateUsd?.multiply(walletSnapshot.saplingBalance.available.convertZatoshiToZec())
+                    .toUsdString()
             )
         )
         Text(
             stringResource(
                 id = R.string.balance_pending_amount_format,
-                walletSnapshot.saplingBalance.pending.toZecString()
+                walletSnapshot.saplingBalance.pending.toZecString(),
+                walletSnapshot.exchangeRateUsd?.multiply(walletSnapshot.saplingBalance.pending.convertZatoshiToZec())
+                    .toUsdString()
             )
         )
 
@@ -147,7 +157,9 @@ private fun BalanceMainContent(
         Text(
             stringResource(
                 id = R.string.balance_available_amount_format,
-                walletSnapshot.transparentBalance.toZecString()
+                walletSnapshot.transparentBalance.toZecString(),
+                walletSnapshot.exchangeRateUsd?.multiply(walletSnapshot.transparentBalance.convertZatoshiToZec())
+                    .toUsdString()
             )
         )
 
diff --git a/demo-app/src/main/java/cash/z/ecc/android/sdk/demoapp/ui/screen/home/viewmodel/WalletSnapshot.kt b/demo-app/src/main/java/cash/z/ecc/android/sdk/demoapp/ui/screen/home/viewmodel/WalletSnapshot.kt
index 11ade79e4..08370fa46 100644
--- a/demo-app/src/main/java/cash/z/ecc/android/sdk/demoapp/ui/screen/home/viewmodel/WalletSnapshot.kt
+++ b/demo-app/src/main/java/cash/z/ecc/android/sdk/demoapp/ui/screen/home/viewmodel/WalletSnapshot.kt
@@ -5,6 +5,7 @@ import cash.z.ecc.android.sdk.block.processor.CompactBlockProcessor
 import cash.z.ecc.android.sdk.model.PercentDecimal
 import cash.z.ecc.android.sdk.model.WalletBalance
 import cash.z.ecc.android.sdk.model.Zatoshi
+import java.math.BigDecimal
 
 data class WalletSnapshot(
     val status: Synchronizer.Status,
@@ -12,6 +13,7 @@ data class WalletSnapshot(
     val orchardBalance: WalletBalance,
     val saplingBalance: WalletBalance,
     val transparentBalance: Zatoshi,
+    val exchangeRateUsd: BigDecimal?,
     val progress: PercentDecimal,
     val synchronizerError: SynchronizerError?
 ) {
diff --git a/demo-app/src/main/java/cash/z/ecc/android/sdk/demoapp/ui/screen/home/viewmodel/WalletViewModel.kt b/demo-app/src/main/java/cash/z/ecc/android/sdk/demoapp/ui/screen/home/viewmodel/WalletViewModel.kt
index fea3c98c1..b1e23eccf 100644
--- a/demo-app/src/main/java/cash/z/ecc/android/sdk/demoapp/ui/screen/home/viewmodel/WalletViewModel.kt
+++ b/demo-app/src/main/java/cash/z/ecc/android/sdk/demoapp/ui/screen/home/viewmodel/WalletViewModel.kt
@@ -20,6 +20,7 @@ import cash.z.ecc.android.sdk.demoapp.util.fromResources
 import cash.z.ecc.android.sdk.internal.Twig
 import cash.z.ecc.android.sdk.model.Account
 import cash.z.ecc.android.sdk.model.BlockHeight
+import cash.z.ecc.android.sdk.model.ObserveFiatCurrencyResult
 import cash.z.ecc.android.sdk.model.PercentDecimal
 import cash.z.ecc.android.sdk.model.PersistableWallet
 import cash.z.ecc.android.sdk.model.Proposal
@@ -435,14 +436,19 @@ private fun Synchronizer.toWalletSnapshot() =
         // 4
         transparentBalance,
         // 5
-        progress,
+        exchangeRateUsd,
         // 6
+        progress,
+        // 7
         toCommonError()
     ) { flows ->
         val orchardBalance = flows[2] as WalletBalance?
         val saplingBalance = flows[3] as WalletBalance?
         val transparentBalance = flows[4] as Zatoshi?
-        val progressPercentDecimal = (flows[5] as PercentDecimal)
+
+        @Suppress("UNCHECKED_CAST")
+        val exchangeRateUsd = flows[5] as ObserveFiatCurrencyResult
+        val progressPercentDecimal = (flows[6] as PercentDecimal)
 
         WalletSnapshot(
             flows[0] as Synchronizer.Status,
@@ -450,7 +456,8 @@ private fun Synchronizer.toWalletSnapshot() =
             orchardBalance ?: WalletBalance(Zatoshi(0), Zatoshi(0), Zatoshi(0)),
             saplingBalance ?: WalletBalance(Zatoshi(0), Zatoshi(0), Zatoshi(0)),
             transparentBalance ?: Zatoshi(0),
+            exchangeRateUsd.currencyConversion?.priceOfZec?.toBigDecimal(),
             progressPercentDecimal,
-            flows[6] as SynchronizerError?
+            flows[7] as SynchronizerError?
         )
     }
diff --git a/demo-app/src/main/res/layout/fragment_get_balance.xml b/demo-app/src/main/res/layout/fragment_get_balance.xml
index 73de74259..ca6afa8f9 100644
--- a/demo-app/src/main/res/layout/fragment_get_balance.xml
+++ b/demo-app/src/main/res/layout/fragment_get_balance.xml
@@ -57,12 +57,19 @@
             android:layout_marginTop="8dp" />
 
 
+        <Button
+            android:id="@+id/refresh_exchange_rate"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="16dp"
+            android:text="@string/action_refresh_exchange_rate"/>
+
         <Button
             android:id="@+id/shield"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_marginTop="16dp"
-            android:text="@string/action_shield"/>
+            android:text="@string/action_shield" />
 
     </androidx.appcompat.widget.LinearLayoutCompat>
 </ScrollView>
diff --git a/demo-app/src/main/res/values/strings.xml b/demo-app/src/main/res/values/strings.xml
index cedefa685..2207badd3 100644
--- a/demo-app/src/main/res/values/strings.xml
+++ b/demo-app/src/main/res/values/strings.xml
@@ -35,6 +35,7 @@
     <string name="unified_address">Unified address</string>
     <string name="sapling_address">Sapling address</string>
     <string name="transparent_address">Transparent address</string>
+    <string name="action_refresh_exchange_rate">Refresh Exchange Rate</string>
     <string name="action_shield">Shield Funds</string>
     <string name="send_status">Send status: <xliff:g id="status" example="Idle">%1$s</xliff:g></string>
 
@@ -59,9 +60,11 @@
     <string name="balance_sapling">Sapling</string>
     <string name="balance_orchard">Orchard</string>
     <string name="balance_available_amount_format">Available:
-        <xliff:g id="ZEC balance" example="0.3">%1$s</xliff:g></string>
+        <xliff:g id="ZEC balance" example="0.3">%1$s</xliff:g>
+        (<xliff:g id="USD balance" example="7.2">%2$s</xliff:g> USD)</string>
     <string name="balance_pending_amount_format">Pending:
-        <xliff:g id="ZEC balance" example="0.3">%1$s</xliff:g></string>
+        <xliff:g id="ZEC balance" example="0.3">%1$s</xliff:g>
+        (<xliff:g id="USD balance" example="7.2">%2$s</xliff:g> USD)</string>
     <string name="balances_refresh">Refresh balances</string>
 
     <string name="send_amount">Amount</string>
diff --git a/docs/Setup.md b/docs/Setup.md
index 7cb023ad3..0a0764480 100644
--- a/docs/Setup.md
+++ b/docs/Setup.md
@@ -15,12 +15,12 @@ Start by making sure the command line with Gradle works first, because **all the
        JVM distributions are available and should work, we have settled on recommending [Adoptium/Temurin](https://adoptium.net), because this is the default distribution used by Gradle toolchains.  For Windows or Linux, be sure that the `JAVA_HOME` environment variable points to the right Java version.  Note: If you switch from a newer to an older JVM version, you may see an error like the following `> com.android.ide.common.signing.KeytoolException: Failed to read key AndroidDebugKey from store "~/.android/debug.keystore": Integrity check failed: java.security.NoSuchAlgorithmException: Algorithm HmacPBESHA256 not available`.  A solution is to delete the debug keystore and allow it to be re-generated.
     1. Android Studio has an embedded JVM, although running Gradle tasks from the command line requires a separate JVM to be installed.  Our Gradle scripts are configured to use toolchains to automatically install the correct JVM version.
 1. Configure Rust
-    1. [Install Rust](https://www.rust-lang.org/learn/get-started). You will need Rust 1.60 to 1.67.1.  Older and newer versions of Rust will fail.  If you use system packages, check the provided version.
+    1. [Install Rust](https://www.rust-lang.org/learn/get-started). You will need at least Rust 1.80.  Older versions of Rust will fail.  If you use system packages, check the provided version.
         1. macOS with Homebrew
             1. `brew install rustup`
             1. `rustup-init`
-            1. `rustup install 1.67.1`
-            1. `rustup default 1.67.1`
+            1. `rustup install 1.80.0`
+            1. `rustup default 1.80.0`
     1. Add Android targets
         ```bash
         rustup target add armv7-linux-androideabi aarch64-linux-android i686-linux-android x86_64-linux-android
diff --git a/lightwallet-client-lib/src/main/java/co/electriccoin/lightwallet/client/model/RawTransactionUnsafe.kt b/lightwallet-client-lib/src/main/java/co/electriccoin/lightwallet/client/model/RawTransactionUnsafe.kt
index b3b343d8e..0c1ac4dfb 100644
--- a/lightwallet-client-lib/src/main/java/co/electriccoin/lightwallet/client/model/RawTransactionUnsafe.kt
+++ b/lightwallet-client-lib/src/main/java/co/electriccoin/lightwallet/client/model/RawTransactionUnsafe.kt
@@ -7,12 +7,41 @@ import cash.z.wallet.sdk.internal.rpc.Service.RawTransaction
  *
  * It is marked as "unsafe" because it is not guaranteed to be valid.
  */
-class RawTransactionUnsafe(val height: BlockHeightUnsafe, val data: ByteArray) {
+sealed class RawTransactionUnsafe(open val data: ByteArray) {
+    /**
+     * The transaction was found in a block mined in the current main chain.
+     */
+    class MainChain(override val data: ByteArray, val height: BlockHeightUnsafe) : RawTransactionUnsafe(data)
+
+    /**
+     * The transaction was found in the mempool, and can potentially be mined in the
+     * current main chain.
+     */
+    @Suppress("SpellCheckingInspection")
+    class Mempool(override val data: ByteArray) : RawTransactionUnsafe(data)
+
+    /**
+     * The transaction was found in an orphaned block.
+     *
+     * In particular, it was not found in the current main chain or the mempool, which
+     * means that the transaction is likely conflicted with the main chain (e.g. it may
+     * double-spend funds spent in the main chain, or it may have expired).
+     */
+    class OrphanedBlock(override val data: ByteArray) : RawTransactionUnsafe(data)
+
     companion object {
-        fun new(rawTransaction: RawTransaction) =
-            RawTransactionUnsafe(
-                BlockHeightUnsafe(rawTransaction.height),
-                rawTransaction.data.toByteArray()
-            )
+        fun new(rawTransaction: RawTransaction): RawTransactionUnsafe {
+            val data = rawTransaction.data.toByteArray()
+            return when (rawTransaction.height) {
+                -1L -> OrphanedBlock(data)
+                0L -> Mempool(data)
+                else -> MainChain(data, BlockHeightUnsafe(rawTransaction.height))
+            }
+        }
     }
+
+    /**
+     * This is a safe [toString] function that prints only non-sensitive parts
+     */
+    override fun toString() = "RawTransactionUnsafe: type: ${this::class.simpleName}"
 }
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 2990cbc86..239ebb510 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,5 +1,5 @@
 [toolchain]
-channel = "1.77.2"
+channel = "1.80.0"
 targets = [
     "armv7-linux-androideabi",
     "aarch64-linux-android",
diff --git a/sdk-incubator-lib/src/androidTest/kotlin/cash/z/ecc/android/sdk/fixture/CurrencyConversionFixture.kt b/sdk-incubator-lib/src/androidTest/kotlin/cash/z/ecc/android/sdk/fixture/CurrencyConversionFixture.kt
index 81da1c82b..0d84f2b8a 100644
--- a/sdk-incubator-lib/src/androidTest/kotlin/cash/z/ecc/android/sdk/fixture/CurrencyConversionFixture.kt
+++ b/sdk-incubator-lib/src/androidTest/kotlin/cash/z/ecc/android/sdk/fixture/CurrencyConversionFixture.kt
@@ -1,18 +1,15 @@
 package cash.z.ecc.android.sdk.fixture
 
-import cash.z.ecc.android.sdk.model.CurrencyConversion
-import cash.z.ecc.android.sdk.model.FiatCurrency
+import cash.z.ecc.android.sdk.model.FiatCurrencyConversion
 import kotlinx.datetime.Instant
 import kotlinx.datetime.toInstant
 
 object CurrencyConversionFixture {
-    val FIAT_CURRENCY = FiatCurrencyFixture.new()
     val TIMESTAMP = "2022-07-08T11:51:44Z".toInstant()
     const val PRICE_OF_ZEC = 54.98
 
     fun new(
-        fiatCurrency: FiatCurrency = FIAT_CURRENCY,
         timestamp: Instant = TIMESTAMP,
         priceOfZec: Double = PRICE_OF_ZEC
-    ) = CurrencyConversion(fiatCurrency, timestamp, priceOfZec)
+    ) = FiatCurrencyConversion(timestamp, priceOfZec)
 }
diff --git a/sdk-incubator-lib/src/main/java/cash/z/ecc/android/sdk/model/FiatCurrencyConversionExt.kt b/sdk-incubator-lib/src/main/java/cash/z/ecc/android/sdk/model/FiatCurrencyConversionExt.kt
new file mode 100644
index 000000000..00acd0a02
--- /dev/null
+++ b/sdk-incubator-lib/src/main/java/cash/z/ecc/android/sdk/model/FiatCurrencyConversionExt.kt
@@ -0,0 +1,60 @@
+package cash.z.ecc.android.sdk.model
+
+import android.content.Context
+import cash.z.ecc.android.sdk.ext.convertUsdToZec
+import cash.z.ecc.android.sdk.ext.convertZecToZatoshi
+import java.math.BigDecimal
+import java.math.RoundingMode
+import java.text.DecimalFormat
+import java.text.DecimalFormatSymbols
+import java.text.ParseException
+import java.util.Locale
+
+fun FiatCurrencyConversion.toZatoshi(
+    context: Context,
+    value: String,
+    monetarySeparators: MonetarySeparators = MonetarySeparators.current(Locale.getDefault()),
+): Zatoshi? {
+    if (!ZecStringExt.filterConfirm(context, monetarySeparators, value)) {
+        return null
+    }
+
+    val symbols =
+        DecimalFormatSymbols.getInstance(Locale.US).apply {
+            this.decimalSeparator = monetarySeparators.decimal
+            if (monetarySeparators.isGroupingValid()) {
+                this.groupingSeparator = monetarySeparators.grouping
+            }
+        }
+
+    val localizedPattern =
+        if (monetarySeparators.isGroupingValid()) {
+            "#${monetarySeparators.grouping}##0${monetarySeparators.decimal}0#"
+        } else {
+            "0${monetarySeparators.decimal}0#"
+        }
+
+    val decimalFormat =
+        DecimalFormat(localizedPattern, symbols).apply {
+            isParseBigDecimal = true
+            roundingMode = RoundingMode.HALF_EVEN // aka Bankers rounding
+        }
+
+    // TODO [#343]: https://github.com/zcash/secant-android-wallet/issues/343
+    val bigDecimal =
+        try {
+            decimalFormat.parse(value) as BigDecimal
+        } catch (e: NumberFormatException) {
+            null
+        } catch (e: ParseException) {
+            null
+        }
+
+    @Suppress("SwallowedException")
+    return try {
+        bigDecimal.convertUsdToZec(priceOfZec.toBigDecimal()).toDouble()
+            .convertZecToZatoshi()
+    } catch (e: IllegalArgumentException) {
+        null
+    }
+}
diff --git a/sdk-incubator-lib/src/main/java/cash/z/ecc/android/sdk/model/WalletAddress.kt b/sdk-incubator-lib/src/main/java/cash/z/ecc/android/sdk/model/WalletAddress.kt
index aabac707c..ff2a904f2 100644
--- a/sdk-incubator-lib/src/main/java/cash/z/ecc/android/sdk/model/WalletAddress.kt
+++ b/sdk-incubator-lib/src/main/java/cash/z/ecc/android/sdk/model/WalletAddress.kt
@@ -31,6 +31,16 @@ sealed class WalletAddress(val address: String) {
         }
     }
 
+    class Tex private constructor(address: String) : WalletAddress(address) {
+        companion object {
+            suspend fun new(address: String): Tex {
+                // TODO [#342]: https://github.com/zcash/zcash-android-wallet-sdk/issues/342
+                // TODO [#342]: refactor SDK to enable direct calls for address verification
+                return Tex(address)
+            }
+        }
+    }
+
     override fun equals(other: Any?): Boolean {
         if (this === other) return true
         if (javaClass != other?.javaClass) return false
diff --git a/sdk-incubator-lib/src/main/java/cash/z/ecc/android/sdk/model/ZatoshiExt.kt b/sdk-incubator-lib/src/main/java/cash/z/ecc/android/sdk/model/ZatoshiExt.kt
index 38d8e7e81..47c96e221 100644
--- a/sdk-incubator-lib/src/main/java/cash/z/ecc/android/sdk/model/ZatoshiExt.kt
+++ b/sdk-incubator-lib/src/main/java/cash/z/ecc/android/sdk/model/ZatoshiExt.kt
@@ -13,7 +13,7 @@ import java.util.Currency
 import kotlin.time.Duration
 
 fun Zatoshi.toFiatCurrencyState(
-    currencyConversion: CurrencyConversion?,
+    currencyConversion: FiatCurrencyConversion?,
     locale: Locale,
     monetarySeparators: MonetarySeparators,
     clock: Clock = Clock.System
@@ -42,15 +42,17 @@ fun Zatoshi.toFiatCurrencyState(
 }
 
 fun Zatoshi.toFiatString(
-    currencyConversion: CurrencyConversion,
+    currencyConversion: FiatCurrencyConversion,
     locale: Locale,
-    monetarySeparators: MonetarySeparators
+    monetarySeparators: MonetarySeparators,
+    includeSymbols: Boolean = true,
 ) = convertZatoshiToZecDecimal()
     .convertZecDecimalToFiatDecimal(BigDecimal(currencyConversion.priceOfZec))
     .convertFiatDecimalToFiatString(
         Currency.getInstance(currencyConversion.fiatCurrency.code),
         locale.toJavaLocale(),
-        monetarySeparators
+        monetarySeparators,
+        includeSymbols
     )
 
 private fun Zatoshi.convertZatoshiToZecDecimal(): BigDecimal {
@@ -65,13 +67,24 @@ private fun BigDecimal.convertZecDecimalToFiatDecimal(zecPrice: BigDecimal): Big
 }
 
 @Suppress("NestedBlockDepth")
-private fun BigDecimal.convertFiatDecimalToFiatString(
+fun BigDecimal.convertFiatDecimalToFiatString(
     fiatCurrency: Currency,
     locale: java.util.Locale,
-    monetarySeparators: MonetarySeparators
+    monetarySeparators: MonetarySeparators,
+    includeSymbols: Boolean = true
 ): String {
-    return NumberFormat.getCurrencyInstance(locale).apply {
-        currency = fiatCurrency
+    val numberFormat =
+        if (includeSymbols) {
+            NumberFormat.getCurrencyInstance(locale)
+        } else {
+            NumberFormat.getInstance(locale)
+        }
+
+    return numberFormat.apply {
+        if (includeSymbols) {
+            currency = fiatCurrency
+        }
+
         roundingMode = RoundingMode.HALF_EVEN
         if (this is DecimalFormat) {
             decimalFormatSymbols.apply {
diff --git a/sdk-lib/build.gradle.kts b/sdk-lib/build.gradle.kts
index 3772d6be7..f30dac67d 100644
--- a/sdk-lib/build.gradle.kts
+++ b/sdk-lib/build.gradle.kts
@@ -88,6 +88,7 @@ tasks.dokkaHtml.configure {
 }
 
 dependencies {
+    api(libs.kotlinx.datetime)
     api(projects.lightwalletClientLib)
     implementation(projects.backendLib)
 
diff --git a/sdk-lib/src/androidTest/java/cash/z/ecc/fixture/FakeRustBackend.kt b/sdk-lib/src/androidTest/java/cash/z/ecc/fixture/FakeRustBackend.kt
index 64d8891d7..7eb4d1861 100644
--- a/sdk-lib/src/androidTest/java/cash/z/ecc/fixture/FakeRustBackend.kt
+++ b/sdk-lib/src/androidTest/java/cash/z/ecc/fixture/FakeRustBackend.kt
@@ -4,6 +4,7 @@ import cash.z.ecc.android.sdk.internal.Backend
 import cash.z.ecc.android.sdk.internal.model.JniBlockMeta
 import cash.z.ecc.android.sdk.internal.model.JniScanRange
 import cash.z.ecc.android.sdk.internal.model.JniSubtreeRoot
+import cash.z.ecc.android.sdk.internal.model.JniTransactionDataRequest
 import cash.z.ecc.android.sdk.internal.model.JniUnifiedSpendingKey
 import cash.z.ecc.android.sdk.internal.model.JniWalletSummary
 import cash.z.ecc.android.sdk.internal.model.ProposalUnsafe
@@ -26,33 +27,33 @@ internal class FakeRustBackend(
         orchardStartIndex: Long,
         orchardRoots: List<JniSubtreeRoot>,
     ) {
-        TODO("Not yet implemented")
+        error("Intentionally not implemented yet.")
     }
 
     override suspend fun updateChainTip(height: Long) {
-        TODO("Not yet implemented")
+        error("Intentionally not implemented yet.")
     }
 
     override suspend fun getFullyScannedHeight(): Long? {
-        TODO("Not yet implemented")
+        error("Intentionally not implemented yet.")
     }
 
     override suspend fun getMaxScannedHeight(): Long? {
-        TODO("Not yet implemented")
+        error("Intentionally not implemented yet.")
     }
 
     override suspend fun getWalletSummary(): JniWalletSummary {
-        TODO("Not yet implemented")
+        error("Intentionally not implemented yet.")
     }
 
     override suspend fun suggestScanRanges(): List<JniScanRange> {
-        TODO("Not yet implemented")
+        error("Intentionally not implemented yet.")
     }
 
     override suspend fun getLatestCacheHeight(): Long = metadata.maxOf { it.height }
 
     override suspend fun getTotalTransparentBalance(address: String): Long {
-        TODO("Not yet implemented")
+        error("Intentionally not implemented yet.")
     }
 
     override suspend fun putUtxo(
@@ -63,7 +64,14 @@ internal class FakeRustBackend(
         value: Long,
         height: Long
     ) {
-        TODO("Not yet implemented")
+        error("Intentionally not implemented yet.")
+    }
+
+    override suspend fun setTransactionStatus(
+        txId: ByteArray,
+        status: Long
+    ) {
+        error("Intentionally not implemented yet.")
     }
 
     override suspend fun findBlockMetadata(height: Long): JniBlockMeta? {
@@ -74,10 +82,9 @@ internal class FakeRustBackend(
         metadata.removeAll { it.height > height }
     }
 
-    override suspend fun initBlockMetaDb(): Int =
-        error(
-            "Intentionally not implemented in mocked FakeRustBackend implementation."
-        )
+    override suspend fun initBlockMetaDb(): Int {
+        error("Intentionally not implemented yet.")
+    }
 
     override suspend fun proposeTransfer(
         account: Int,
@@ -85,7 +92,7 @@ internal class FakeRustBackend(
         value: Long,
         memo: ByteArray?
     ): ProposalUnsafe {
-        TODO("Not yet implemented")
+        error("Intentionally not implemented yet.")
     }
 
     override suspend fun proposeShielding(
@@ -94,27 +101,34 @@ internal class FakeRustBackend(
         memo: ByteArray?,
         transparentReceiver: String?
     ): ProposalUnsafe? {
-        TODO("Not yet implemented")
+        error("Intentionally not implemented yet.")
     }
 
     override suspend fun createProposedTransactions(
         proposal: ProposalUnsafe,
         unifiedSpendingKey: ByteArray
     ): List<ByteArray> {
-        TODO("Not yet implemented")
+        error("Intentionally not implemented yet.")
     }
 
-    override suspend fun decryptAndStoreTransaction(tx: ByteArray) =
-        error("Intentionally not implemented in mocked FakeRustBackend implementation.")
+    override suspend fun decryptAndStoreTransaction(
+        tx: ByteArray,
+        minedHeight: Long?
+    ) {
+        error("Intentionally not implemented yet.")
+    }
 
-    override suspend fun initDataDb(seed: ByteArray?): Int =
-        error("Intentionally not implemented in mocked FakeRustBackend implementation.")
+    override suspend fun initDataDb(seed: ByteArray?): Int {
+        error("Intentionally not implemented yet.")
+    }
 
     override suspend fun createAccount(
         seed: ByteArray,
         treeState: ByteArray,
         recoverUntil: Long?
-    ): JniUnifiedSpendingKey = error("Intentionally not implemented in mocked FakeRustBackend implementation.")
+    ): JniUnifiedSpendingKey {
+        error("Intentionally not implemented yet.")
+    }
 
     override suspend fun isSeedRelevantToAnyDerivedAccounts(seed: ByteArray): Boolean =
         error("Intentionally not implemented in mocked FakeRustBackend implementation.")
@@ -128,34 +142,40 @@ internal class FakeRustBackend(
     override fun isValidUnifiedAddr(addr: String): Boolean =
         error("Intentionally not implemented in mocked FakeRustBackend implementation.")
 
+    override fun isValidTexAddr(addr: String): Boolean {
+        error("Intentionally not implemented in mocked FakeRustBackend implementation.")
+    }
+
     override suspend fun getCurrentAddress(account: Int): String {
-        TODO("Not yet implemented")
+        error("Intentionally not implemented yet.")
     }
 
-    override fun getTransparentReceiver(ua: String): String? =
-        error("Intentionally not implemented in mocked FakeRustBackend implementation.")
+    override fun getTransparentReceiver(ua: String): String? {
+        error("Intentionally not implemented yet.")
+    }
 
-    override fun getSaplingReceiver(ua: String): String? =
-        error(
-            "Intentionally not implemented in mocked FakeRustBackend implementation."
-        )
+    override fun getSaplingReceiver(ua: String): String? {
+        error("Intentionally not implemented yet.")
+    }
 
     override suspend fun listTransparentReceivers(account: Int): List<String> {
-        TODO("Not yet implemented")
+        error("Intentionally not implemented yet.")
     }
 
     override fun getBranchIdForHeight(height: Long): Long {
-        TODO("Not yet implemented")
+        error("Intentionally not implemented yet.")
     }
 
     override suspend fun getMemoAsUtf8(
         txId: ByteArray,
         protocol: Int,
         outputIndex: Int
-    ): String? = error("Intentionally not implemented in mocked FakeRustBackend implementation.")
+    ): String? {
+        error("Intentionally not implemented yet.")
+    }
 
     override suspend fun getNearestRewindHeight(height: Long): Long {
-        TODO("Not yet implemented")
+        error("Intentionally not implemented yet.")
     }
 
     override suspend fun scanBlocks(
@@ -163,4 +183,8 @@ internal class FakeRustBackend(
         fromState: ByteArray,
         limit: Long
     ) = error("Intentionally not implemented in mocked FakeRustBackend implementation.")
+
+    override suspend fun transactionDataRequests(): List<JniTransactionDataRequest> {
+        error("Intentionally not implemented yet.")
+    }
 }
diff --git a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/SdkSynchronizer.kt b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/SdkSynchronizer.kt
index 8d025e606..a2806b0c2 100644
--- a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/SdkSynchronizer.kt
+++ b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/SdkSynchronizer.kt
@@ -26,6 +26,7 @@ import cash.z.ecc.android.sdk.internal.block.CompactBlockDownloader
 import cash.z.ecc.android.sdk.internal.db.DatabaseCoordinator
 import cash.z.ecc.android.sdk.internal.db.derived.DbDerivedDataRepository
 import cash.z.ecc.android.sdk.internal.db.derived.DerivedDataDb
+import cash.z.ecc.android.sdk.internal.exchange.UsdExchangeRateFetcher
 import cash.z.ecc.android.sdk.internal.ext.existsSuspend
 import cash.z.ecc.android.sdk.internal.ext.isNullOrEmpty
 import cash.z.ecc.android.sdk.internal.ext.tryNull
@@ -43,6 +44,8 @@ import cash.z.ecc.android.sdk.internal.transaction.TransactionEncoderImpl
 import cash.z.ecc.android.sdk.model.Account
 import cash.z.ecc.android.sdk.model.BlockHeight
 import cash.z.ecc.android.sdk.model.FastestServersResult
+import cash.z.ecc.android.sdk.model.FetchFiatCurrencyResult
+import cash.z.ecc.android.sdk.model.ObserveFiatCurrencyResult
 import cash.z.ecc.android.sdk.model.PercentDecimal
 import cash.z.ecc.android.sdk.model.Proposal
 import cash.z.ecc.android.sdk.model.TransactionOverview
@@ -53,6 +56,7 @@ import cash.z.ecc.android.sdk.model.Zatoshi
 import cash.z.ecc.android.sdk.model.ZcashNetwork
 import cash.z.ecc.android.sdk.type.AddressType
 import cash.z.ecc.android.sdk.type.AddressType.Shielded
+import cash.z.ecc.android.sdk.type.AddressType.Tex
 import cash.z.ecc.android.sdk.type.AddressType.Transparent
 import cash.z.ecc.android.sdk.type.AddressType.Unified
 import cash.z.ecc.android.sdk.type.ConsensusMatchType
@@ -64,20 +68,28 @@ import co.electriccoin.lightwallet.client.new
 import kotlinx.coroutines.CoroutineExceptionHandler
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.SupervisorJob
 import kotlinx.coroutines.cancel
 import kotlinx.coroutines.channels.awaitClose
 import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.callbackFlow
+import kotlinx.coroutines.flow.channelFlow
 import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.flatMapLatest
+import kotlinx.coroutines.flow.flow
+import kotlinx.coroutines.flow.flowOn
 import kotlinx.coroutines.flow.launchIn
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.onEach
+import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.sync.withLock
@@ -101,7 +113,7 @@ import kotlin.time.Duration.Companion.seconds
  * @property processor saves the downloaded compact blocks to the cache and then scans those blocks for
  * data related to this wallet.
  */
-@Suppress("TooManyFunctions")
+@Suppress("TooManyFunctions", "LongParameterList")
 class SdkSynchronizer private constructor(
     private val synchronizerKey: SynchronizerKey,
     private val storage: DerivedDataRepository,
@@ -109,6 +121,7 @@ class SdkSynchronizer private constructor(
     val processor: CompactBlockProcessor,
     private val backend: TypesafeBackend,
     private val fetchFastestServers: FastestServerFetcher,
+    private val fetchExchangeChangeUsd: UsdExchangeRateFetcher
 ) : CloseableSynchronizer {
     companion object {
         private sealed class InstanceState {
@@ -139,7 +152,8 @@ class SdkSynchronizer private constructor(
             txManager: OutboundTransactionManager,
             processor: CompactBlockProcessor,
             backend: TypesafeBackend,
-            fastestServerFetcher: FastestServerFetcher
+            fastestServerFetcher: FastestServerFetcher,
+            fetchExchangeChangeUsd: UsdExchangeRateFetcher,
         ): CloseableSynchronizer {
             val synchronizerKey = SynchronizerKey(zcashNetwork, alias)
 
@@ -153,7 +167,8 @@ class SdkSynchronizer private constructor(
                     txManager,
                     processor,
                     backend,
-                    fastestServerFetcher
+                    fastestServerFetcher,
+                    fetchExchangeChangeUsd
                 ).apply {
                     instances[synchronizerKey] = InstanceState.Active
                     start()
@@ -192,14 +207,51 @@ class SdkSynchronizer private constructor(
         }
     }
 
-    private val _status = MutableStateFlow<Synchronizer.Status>(DISCONNECTED)
+    private val _status = MutableStateFlow(DISCONNECTED)
 
-    var coroutineScope: CoroutineScope = CoroutineScope(SupervisorJob() + Dispatchers.Main)
+    val coroutineScope: CoroutineScope = CoroutineScope(SupervisorJob() + Dispatchers.Main)
 
     override val orchardBalances = processor.orchardBalances.asStateFlow()
     override val saplingBalances = processor.saplingBalances.asStateFlow()
     override val transparentBalance = processor.transparentBalance.asStateFlow()
 
+    private val refreshExchangeRateUsd = MutableSharedFlow<Unit>(replay = 1).apply { tryEmit(Unit) }
+
+    private var lastExchangeRateValue = ObserveFiatCurrencyResult()
+
+    @OptIn(ExperimentalCoroutinesApi::class)
+    override val exchangeRateUsd =
+        channelFlow {
+            refreshExchangeRateUsd
+                .flatMapLatest {
+                    flow {
+                        emit(lastExchangeRateValue.copy(isLoading = true))
+                        lastExchangeRateValue =
+                            when (val result = fetchExchangeChangeUsd()) {
+                                is FetchFiatCurrencyResult.Error -> lastExchangeRateValue.copy(isLoading = false)
+
+                                is FetchFiatCurrencyResult.Success ->
+                                    lastExchangeRateValue.copy(
+                                        isLoading = false,
+                                        currencyConversion = result.currencyConversion
+                                    )
+                            }
+                        emit(lastExchangeRateValue)
+                    }
+                }
+                .onEach { send(it) }
+                .flowOn(Dispatchers.Default)
+                .launchIn(this)
+
+            awaitClose {
+                // do nothing
+            }
+        }.flowOn(Dispatchers.Default).stateIn(
+            scope = coroutineScope,
+            started = SharingStarted.WhileSubscribed(), // stop immediately
+            initialValue = ObserveFiatCurrencyResult()
+        )
+
     override val transactions
         get() =
             combine(processor.networkHeight, storage.allTransactions) { networkHeight, allTransactions ->
@@ -318,6 +370,7 @@ class SdkSynchronizer private constructor(
             coroutineScope.launch {
                 Twig.info { "Stopping synchronizer $synchronizerKey…" }
                 processor.stop()
+                fetchExchangeChangeUsd.dispose()
             }
 
         instances[synchronizerKey] = InstanceState.ShuttingDown(shutdownJob)
@@ -426,6 +479,12 @@ class SdkSynchronizer private constructor(
         processor.refreshWalletSummary()
     }
 
+    override suspend fun refreshExchangeRateUsd() {
+        coroutineScope.launch {
+            refreshExchangeRateUsd.emit(Unit)
+        }
+    }
+
     suspend fun isValidAddress(address: String): Boolean {
         return !validateAddress(address).isNotValid
     }
@@ -551,7 +610,7 @@ class SdkSynchronizer private constructor(
         val reason = if (scannedRange.isNullOrEmpty()) "it's been a while" else "new blocks were scanned"
 
         if (shouldRefresh) {
-            Twig.info { "Triggering utxo refresh since $reason!" }
+            Twig.debug { "Triggering utxo refresh since $reason!" }
             refreshUtxos(Account.DEFAULT)
 
             Twig.debug { "Triggering balance refresh since $reason!" }
@@ -645,6 +704,7 @@ class SdkSynchronizer private constructor(
                         is TransactionSubmitResult.Success -> {
                             // Expected state
                         }
+
                         is TransactionSubmitResult.Failure,
                         is TransactionSubmitResult.NotAttempted -> {
                             anySubmissionFailed = true
@@ -682,6 +742,7 @@ class SdkSynchronizer private constructor(
             is TransactionSubmitResult.Success -> {
                 return storage.findMatchingTransactionId(encodedTx.txId.byteArray)!!
             }
+
             else -> {
                 throw TransactionSubmitException()
             }
@@ -717,6 +778,7 @@ class SdkSynchronizer private constructor(
             is TransactionSubmitResult.Success -> {
                 return storage.findMatchingTransactionId(encodedTx.txId.byteArray)!!
             }
+
             else -> {
                 throw TransactionSubmitException()
             }
@@ -740,6 +802,8 @@ class SdkSynchronizer private constructor(
 
     override suspend fun isValidUnifiedAddr(address: String) = txManager.isValidUnifiedAddress(address)
 
+    override suspend fun isValidTexAddr(address: String) = txManager.isValidTexAddress(address)
+
     override suspend fun validateAddress(address: String): AddressType =
         runCatching {
             if (isValidShieldedAddr(address)) {
@@ -748,6 +812,8 @@ class SdkSynchronizer private constructor(
                 Transparent
             } else if (isValidUnifiedAddr(address)) {
                 Unified
+            } else if (isValidTexAddr(address)) {
+                Tex
             } else {
                 AddressType.Invalid("Not a Zcash address")
             }
@@ -769,6 +835,7 @@ class SdkSynchronizer private constructor(
                     Twig.info { "Chain tip for validate consensus branch action fetched: ${response.result.value}" }
                     runCatching { response.result.toBlockHeight(network) }.getOrNull()
                 }
+
                 is Response.Failure -> {
                     Twig.error {
                         "Chain tip fetch failed for validate consensus branch action with:" +
@@ -846,6 +913,7 @@ class SdkSynchronizer private constructor(
                         return ServerValidation.InValid(it)
                     }
                 }
+
                 is Response.Failure -> {
                     return ServerValidation.InValid(response.toThrowable())
                 }
diff --git a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/Synchronizer.kt b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/Synchronizer.kt
index e5eb3f706..d28345e4f 100644
--- a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/Synchronizer.kt
+++ b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/Synchronizer.kt
@@ -9,13 +9,16 @@ import cash.z.ecc.android.sdk.exception.InitializeException
 import cash.z.ecc.android.sdk.ext.ZcashSdk
 import cash.z.ecc.android.sdk.internal.Derivation
 import cash.z.ecc.android.sdk.internal.FastestServerFetcher
+import cash.z.ecc.android.sdk.internal.Files
 import cash.z.ecc.android.sdk.internal.SaplingParamTool
 import cash.z.ecc.android.sdk.internal.Twig
 import cash.z.ecc.android.sdk.internal.db.DatabaseCoordinator
+import cash.z.ecc.android.sdk.internal.exchange.UsdExchangeRateFetcher
 import cash.z.ecc.android.sdk.internal.model.ext.toBlockHeight
 import cash.z.ecc.android.sdk.model.Account
 import cash.z.ecc.android.sdk.model.BlockHeight
 import cash.z.ecc.android.sdk.model.FastestServersResult
+import cash.z.ecc.android.sdk.model.ObserveFiatCurrencyResult
 import cash.z.ecc.android.sdk.model.PercentDecimal
 import cash.z.ecc.android.sdk.model.Proposal
 import cash.z.ecc.android.sdk.model.TransactionOverview
@@ -88,6 +91,13 @@ interface Synchronizer {
      */
     val transparentBalance: StateFlow<Zatoshi?>
 
+    /**
+     * The latest known USD/ZEC exchange rate, paired with the time it was queried.
+     *
+     * The rate can be initialized and refreshed by calling [refreshExchangeRateUsd].
+     */
+    val exchangeRateUsd: StateFlow<ObserveFiatCurrencyResult>
+
     /**
      * A flow of all the transactions that are on the blockchain.
      */
@@ -181,6 +191,11 @@ interface Synchronizer {
      */
     suspend fun getTransparentAddress(account: Account): String
 
+    /**
+     * Refreshes [exchangeRateUsd].
+     */
+    suspend fun refreshExchangeRateUsd()
+
     /**
      * Creates a proposal for transferring funds to the given recipient.
      *
@@ -278,6 +293,9 @@ interface Synchronizer {
         memo: String = ZcashSdk.DEFAULT_SHIELD_FUNDS_MEMO_PREFIX
     ): Long
 
+    // TODO [#1534]: Add RustLayerException.ValidateAddressException
+    // TODO [#1534]: https://github.com/Electric-Coin-Company/zcash-android-wallet-sdk/issues/1534
+
     /**
      * Returns true when the given address is a valid z-addr. Invalid addresses will throw an
      * exception. See valid z-addresses characteristics in related ZIP.
@@ -316,6 +334,21 @@ interface Synchronizer {
      */
     suspend fun isValidUnifiedAddr(address: String): Boolean
 
+    /**
+     * Returns true when the given address is a valid ZIP 320 TEX address.
+     *
+     * This method is intended for type checking (e.g. form validation). Invalid
+     * addresses will throw an exception. See valid t-addresses characteristics
+     * in the related ZIP.
+     *
+     * @param address the address to validate.
+     *
+     * @return true when the given address is a valid ZIP 320 TEX address.
+     *
+     * @throws RuntimeException when the address is invalid.
+     */
+    suspend fun isValidTexAddr(address: String): Boolean
+
     /**
      * Validate whether the server and this SDK share the same consensus branch. This is
      * particularly important to check around network updates so that any wallet that's connected to
@@ -658,8 +691,6 @@ interface Synchronizer {
                     birthdayHeight = birthday ?: zcashNetwork.saplingActivationHeight
                 )
 
-            val fastestServerFetcher = FastestServerFetcher(backend = backend, network = processor.network)
-
             return SdkSynchronizer.new(
                 zcashNetwork = zcashNetwork,
                 alias = alias,
@@ -667,7 +698,11 @@ interface Synchronizer {
                 txManager = txManager,
                 processor = processor,
                 backend = backend,
-                fastestServerFetcher
+                fastestServerFetcher = FastestServerFetcher(backend = backend, network = processor.network),
+                fetchExchangeChangeUsd =
+                    UsdExchangeRateFetcher(
+                        torDir = Files.getTorDir(context)
+                    )
             )
         }
 
diff --git a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/block/processor/CompactBlockProcessor.kt b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/block/processor/CompactBlockProcessor.kt
index 05dd15b6b..53efca057 100644
--- a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/block/processor/CompactBlockProcessor.kt
+++ b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/block/processor/CompactBlockProcessor.kt
@@ -15,8 +15,10 @@ import cash.z.ecc.android.sdk.block.processor.model.SyncingResult
 import cash.z.ecc.android.sdk.block.processor.model.UpdateChainTipResult
 import cash.z.ecc.android.sdk.block.processor.model.VerifySuggestedScanRange
 import cash.z.ecc.android.sdk.exception.CompactBlockProcessorException
+import cash.z.ecc.android.sdk.exception.CompactBlockProcessorException.EnhanceTransactionError.EnhanceTxDataRequestsError
 import cash.z.ecc.android.sdk.exception.CompactBlockProcessorException.EnhanceTransactionError.EnhanceTxDecryptError
 import cash.z.ecc.android.sdk.exception.CompactBlockProcessorException.EnhanceTransactionError.EnhanceTxDownloadError
+import cash.z.ecc.android.sdk.exception.CompactBlockProcessorException.EnhanceTransactionError.EnhanceTxSetStatusError
 import cash.z.ecc.android.sdk.exception.CompactBlockProcessorException.MismatchedConsensusBranch
 import cash.z.ecc.android.sdk.exception.CompactBlockProcessorException.MismatchedNetwork
 import cash.z.ecc.android.sdk.exception.InitializeException
@@ -38,24 +40,28 @@ import cash.z.ecc.android.sdk.internal.ext.retryWithBackoff
 import cash.z.ecc.android.sdk.internal.ext.toHexReversed
 import cash.z.ecc.android.sdk.internal.metrics.TraceScope
 import cash.z.ecc.android.sdk.internal.model.BlockBatch
-import cash.z.ecc.android.sdk.internal.model.DbTransactionOverview
 import cash.z.ecc.android.sdk.internal.model.JniBlockMeta
 import cash.z.ecc.android.sdk.internal.model.ScanRange
 import cash.z.ecc.android.sdk.internal.model.SubtreeRoot
 import cash.z.ecc.android.sdk.internal.model.SuggestScanRangePriority
+import cash.z.ecc.android.sdk.internal.model.TransactionDataRequest
+import cash.z.ecc.android.sdk.internal.model.TransactionStatus
 import cash.z.ecc.android.sdk.internal.model.TreeState
 import cash.z.ecc.android.sdk.internal.model.WalletSummary
 import cash.z.ecc.android.sdk.internal.model.ext.from
 import cash.z.ecc.android.sdk.internal.model.ext.toBlockHeight
+import cash.z.ecc.android.sdk.internal.model.ext.toTransactionStatus
 import cash.z.ecc.android.sdk.internal.repository.DerivedDataRepository
 import cash.z.ecc.android.sdk.model.Account
 import cash.z.ecc.android.sdk.model.BlockHeight
 import cash.z.ecc.android.sdk.model.PercentDecimal
+import cash.z.ecc.android.sdk.model.RawTransaction
 import cash.z.ecc.android.sdk.model.WalletBalance
 import cash.z.ecc.android.sdk.model.Zatoshi
 import cash.z.ecc.android.sdk.model.ZcashNetwork
 import co.electriccoin.lightwallet.client.model.BlockHeightUnsafe
 import co.electriccoin.lightwallet.client.model.GetAddressUtxosReplyUnsafe
+import co.electriccoin.lightwallet.client.model.RawTransactionUnsafe
 import co.electriccoin.lightwallet.client.model.Response
 import co.electriccoin.lightwallet.client.model.ShieldedProtocolEnum
 import co.electriccoin.lightwallet.client.model.SubtreeRootUnsafe
@@ -1574,7 +1580,8 @@ class CompactBlockProcessor internal constructor(
                                 range = currentEnhancingRange,
                                 repository = repository,
                                 backend = backend,
-                                downloader = downloader
+                                downloader = downloader,
+                                network = network
                             ).collect { enhancingResult ->
                                 Twig.info { "Enhancing result: $enhancingResult" }
                                 resultState =
@@ -1838,29 +1845,67 @@ class CompactBlockProcessor internal constructor(
             range: ClosedRange<BlockHeight>,
             repository: DerivedDataRepository,
             backend: TypesafeBackend,
-            downloader: CompactBlockDownloader
+            downloader: CompactBlockDownloader,
+            network: ZcashNetwork
         ): Flow<SyncingResult> =
             flow {
                 Twig.debug { "Enhancing transaction details for blocks $range" }
 
-                val newTxs = repository.findNewTransactions(range)
-                if (newTxs.isEmpty()) {
+                val newTxDataRequests =
+                    runCatching {
+                        transactionDataRequests(backend)
+                    }.onFailure {
+                        Twig.error(it) { "Failed to get transaction data requests" }
+                    }.getOrElse {
+                        emit(
+                            SyncingResult.EnhanceFailed(
+                                range.start,
+                                it as CompactBlockProcessorException.EnhanceTransactionError
+                            )
+                        )
+                        return@flow
+                    }
+
+                if (newTxDataRequests.isEmpty()) {
                     Twig.debug { "No new transactions found in $range" }
                 } else {
-                    Twig.debug { "Enhancing ${newTxs.size} transaction(s)!" }
+                    Twig.debug { "Enhancing ${newTxDataRequests.size} transaction(s)!" }
 
                     // If the first transaction has been added
-                    if (newTxs.size.toLong() == repository.getTransactionCount()) {
+                    // Ideally, we could remove this last reference to the transaction view from the enhancing logic
+                    if (newTxDataRequests.size.toLong() == repository.getTransactionCount()) {
                         Twig.debug { "Encountered the first transaction. This changes the birthday height!" }
                         emit(SyncingResult.UpdateBirthday)
                     }
 
-                    newTxs.filter { it.minedHeight != null }.onEach { newTransaction ->
-                        val trEnhanceResult = enhanceTransaction(newTransaction, backend, downloader)
-                        if (trEnhanceResult is SyncingResult.EnhanceFailed) {
-                            Twig.error { "Encountered transaction enhancing error: ${trEnhanceResult.exception}" }
-                            emit(trEnhanceResult)
-                            // We intentionally do not terminate the batch enhancing here, just reporting it
+                    newTxDataRequests.forEach {
+                        Twig.debug { "Transaction data request: $it" }
+
+                        when (it) {
+                            is TransactionDataRequest.EnhancementRequired -> {
+                                val trxEnhanceResult = enhanceTransaction(it, backend, downloader, network)
+                                if (trxEnhanceResult is SyncingResult.EnhanceFailed) {
+                                    Twig.error(trxEnhanceResult.exception) { "Encountered transaction enhancing error" }
+                                    emit(trxEnhanceResult)
+                                    // We intentionally do not terminate the batch enhancing here, just reporting it
+                                }
+                            }
+                            is TransactionDataRequest.SpendsFromAddress -> {
+                                val processTaddrTxidsResult =
+                                    processTransparentAddressTxids(
+                                        transactionRequest = it,
+                                        backend = backend,
+                                        downloader = downloader,
+                                        network = network
+                                    )
+                                if (processTaddrTxidsResult is SyncingResult.EnhanceFailed) {
+                                    Twig.error(processTaddrTxidsResult.exception) {
+                                        "Encountered SpendsFromAddress transactions error"
+                                    }
+                                    emit(processTaddrTxidsResult)
+                                    // We intentionally do not terminate the batch enhancing here, just reporting it
+                                }
+                            }
                         }
                     }
                 }
@@ -1869,107 +1914,253 @@ class CompactBlockProcessor internal constructor(
                 emit(SyncingResult.EnhanceSuccess)
             }
 
-        private suspend fun enhanceTransaction(
-            transaction: DbTransactionOverview,
+        private suspend fun processTransparentAddressTxids(
+            transactionRequest: TransactionDataRequest.SpendsFromAddress,
             backend: TypesafeBackend,
-            downloader: CompactBlockDownloader
+            downloader: CompactBlockDownloader,
+            network: ZcashNetwork
         ): SyncingResult {
-            Twig.debug {
-                "Starting enhancing transaction (txid:${transaction.txIdString()}  block:${transaction
-                    .minedHeight})"
+            Twig.debug { "Starting to get transparent address transactions ids" }
+
+            // TODO [#1564]: Support empty block range end
+            if (transactionRequest.endHeight == null) {
+                Twig.error { "Unexpected Null " }
+                return SyncingResult.EnhanceFailed(
+                    failedAtHeight = transactionRequest.startHeight,
+                    exception =
+                        CompactBlockProcessorException.EnhanceTransactionError(
+                            message = "Unexpected NULL TransactionDataRequest.SpendsFromAddress.endHeight",
+                            height = transactionRequest.startHeight,
+                            cause = IllegalStateException("Unexpected SpendsFromAddress state")
+                        )
+                )
             }
-            if (transaction.minedHeight == null) {
-                return SyncingResult.EnhanceSuccess
+
+            val traceScope = TraceScope("CompactBlockProcessor.processTransparentAddressTxids")
+            val result =
+                try {
+                    // Fetching transactions is done with retries to eliminate a bad network condition
+                    getTransparentAddressTransactions(
+                        transactionRequest = transactionRequest,
+                        downloader = downloader
+                    ).onEach { rawTransactionUnsafe ->
+                        // Decrypting and storing transaction is run just once, since we consider it more stable
+                        Twig.verbose { "Decrypting and storing rawTransactionUnsafe" }
+                        decryptTransaction(
+                            rawTransaction =
+                                RawTransaction.new(
+                                    rawTransactionUnsafe = rawTransactionUnsafe,
+                                    network = network
+                                ),
+                            backend = backend
+                        )
+                    }.onCompletion {
+                        Twig.verbose { "Done Decrypting and storing of all transaction" }
+                    }.collect()
+
+                    SyncingResult.EnhanceSuccess
+                } catch (exception: CompactBlockProcessorException.EnhanceTransactionError) {
+                    SyncingResult.EnhanceFailed(transactionRequest.startHeight, exception)
+                }
+            traceScope.end()
+            return result
+        }
+
+        @Throws(EnhanceTxDownloadError::class)
+        private suspend fun getTransparentAddressTransactions(
+            transactionRequest: TransactionDataRequest.SpendsFromAddress,
+            downloader: CompactBlockDownloader,
+        ): Flow<RawTransactionUnsafe> {
+            val traceScope = TraceScope("CompactBlockProcessor.getTransparentAddressTransactions")
+            var resultFlow: Flow<RawTransactionUnsafe>? = null
+
+            retryUpToAndThrow(
+                retries = TRANSACTION_FETCH_RETRIES,
+                exceptionWrapper = { EnhanceTxDownloadError(it) }
+            ) { failedAttempts ->
+                if (failedAttempts == 0) {
+                    Twig.debug { "Starting to get transactions for tAddr: ${transactionRequest.address}" }
+                } else {
+                    Twig.warn {
+                        "Retrying to fetch transactions for tAddr: ${transactionRequest.address}" +
+                            " after $failedAttempts failure(s)..."
+                    }
+                }
+
+                // We can safely assert non-nullability here as we check in the function caller
+                // - 1 for the end height because the GRPC request is end-inclusive whereas we use end-exclusive
+                // ranges everywhere in the Rust code
+                val requestedRange = transactionRequest.startHeight..(transactionRequest.endHeight!! - 1)
+                resultFlow =
+                    downloader.getTAddressTransactions(
+                        transparentAddress = transactionRequest.address,
+                        blockHeightRange = requestedRange
+                    )
             }
+            traceScope.end()
+            // The flow is initialized or the EnhanceTxDownloadError is thrown after all the attempts failed
+            return resultFlow!!
+        }
+
+        @Suppress("LongMethod")
+        private suspend fun enhanceTransaction(
+            transactionRequest: TransactionDataRequest.EnhancementRequired,
+            backend: TypesafeBackend,
+            downloader: CompactBlockDownloader,
+            network: ZcashNetwork
+        ): SyncingResult {
+            Twig.debug { "Starting enhancing transaction: txid: ${transactionRequest.txIdString()}" }
 
             val traceScope = TraceScope("CompactBlockProcessor.enhanceTransaction")
             val result =
                 try {
                     // Fetching transaction is done with retries to eliminate a bad network condition
-                    Twig.verbose {
-                        "Fetching transaction (txid:${transaction.txIdString()}  block:${transaction
-                            .minedHeight})"
-                    }
-                    val transactionData =
+                    val rawTransactionUnsafe =
                         fetchTransaction(
-                            transactionId = transaction.txIdString(),
-                            rawTransactionId = transaction.rawId.byteArray,
-                            minedHeight = transaction.minedHeight,
-                            downloader = downloader
+                            transactionRequest = transactionRequest,
+                            downloader = downloader,
                         )
 
-                    // Decrypting and storing transaction is run just once, since we consider it more stable
-                    Twig.verbose {
-                        "Decrypting and storing transaction " +
-                            "(txid:${transaction.txIdString()}  block:${transaction.minedHeight})"
-                    }
-                    decryptTransaction(
-                        transactionData = transactionData,
-                        minedHeight = transaction.minedHeight,
-                        backend = backend
-                    )
+                    Twig.debug { "Transaction fetched: $rawTransactionUnsafe" }
 
-                    Twig.debug {
-                        "Done enhancing transaction (txid:${transaction.txIdString()} block:${transaction
-                            .minedHeight})"
+                    // We need to distinct between the two possible states of [transactionRequest]
+                    when (transactionRequest) {
+                        is TransactionDataRequest.GetStatus -> {
+                            Twig.debug {
+                                "Resolving TransactionDataRequest.GetStatus by setting status of " +
+                                    "transaction: txid: ${transactionRequest.txIdString() }"
+                            }
+                            val status =
+                                rawTransactionUnsafe?.toTransactionStatus(network)
+                                    ?: TransactionStatus.TxidNotRecognized
+                            setTransactionStatus(
+                                transactionRawId = transactionRequest.txid,
+                                status = status,
+                                backend = backend
+                            )
+                        }
+                        is TransactionDataRequest.Enhancement -> {
+                            if (rawTransactionUnsafe == null) {
+                                Twig.debug {
+                                    "Resolving TransactionDataRequest.Enhancement by setting status of " +
+                                        "transaction. Txid not recognized: ${transactionRequest.txIdString()}"
+                                }
+                                setTransactionStatus(
+                                    transactionRawId = transactionRequest.txid,
+                                    status = TransactionStatus.TxidNotRecognized,
+                                    backend = backend
+                                )
+                            } else {
+                                Twig.debug {
+                                    "Resolving TransactionDataRequest.Enhancement by decrypting and storing " +
+                                        "transaction: txid: ${transactionRequest.txIdString()}"
+                                }
+                                decryptTransaction(
+                                    rawTransaction =
+                                        RawTransaction.new(
+                                            rawTransactionUnsafe = rawTransactionUnsafe,
+                                            network = network
+                                        ),
+                                    backend = backend
+                                )
+                            }
+                        }
                     }
+
+                    Twig.debug { "Done enhancing transaction: txid: ${transactionRequest.txIdString()}" }
                     SyncingResult.EnhanceSuccess
                 } catch (exception: CompactBlockProcessorException.EnhanceTransactionError) {
-                    SyncingResult.EnhanceFailed(
-                        transaction.minedHeight,
-                        exception
-                    )
+                    SyncingResult.EnhanceFailed(null, exception)
                 }
             traceScope.end()
             return result
         }
 
-        // TODO [#1254]: CompactblockProcessor.fetchTransaction pass txId twice
-        // TODO [#1254]: https://github.com/zcash/zcash-android-wallet-sdk/issues/1254
+        /**
+         * Fetch the transaction complete data by [TransactionDataRequest.EnhancementRequired.txid] from Light Wallet
+         * server. This function handles [Response.Failure.Server.NotFound] by returning null.
+         *
+         * @return [RawTransactionUnsafe] if the transaction has been found, null otherwise.
+         *
+         * @throws CompactBlockProcessorException.EnhanceTransactionError in case of any other error
+         */
         @Throws(EnhanceTxDownloadError::class)
         private suspend fun fetchTransaction(
-            transactionId: String,
-            rawTransactionId: ByteArray,
-            minedHeight: BlockHeight,
-            downloader: CompactBlockDownloader
-        ): ByteArray {
+            transactionRequest: TransactionDataRequest.EnhancementRequired,
+            downloader: CompactBlockDownloader,
+        ): RawTransactionUnsafe? {
+            var transactionResult: RawTransactionUnsafe? = null
             val traceScope = TraceScope("CompactBlockProcessor.fetchTransaction")
-            var transactionDataResult: ByteArray? = null
+
             retryUpToAndThrow(TRANSACTION_FETCH_RETRIES) { failedAttempts ->
                 if (failedAttempts == 0) {
-                    Twig.debug { "Starting to fetch transaction (txid:$transactionId, block:$minedHeight)" }
+                    Twig.debug { "Starting to fetch transaction: txid: ${transactionRequest.txIdString()}" }
                 } else {
                     Twig.warn {
-                        "Retrying to fetch transaction (txid:$transactionId, block:$minedHeight) after" +
-                            " $failedAttempts failure(s)..."
+                        "Retrying to fetch transaction: txid: ${transactionRequest.txIdString()}" +
+                            " after $failedAttempts failure(s)..."
                     }
                 }
-                when (val response = downloader.fetchTransaction(rawTransactionId)) {
-                    is Response.Success -> {
-                        transactionDataResult = response.result.data
-                    }
-                    is Response.Failure -> {
-                        throw EnhanceTxDownloadError(minedHeight, response.toThrowable())
+
+                transactionResult =
+                    when (val response = downloader.fetchTransaction(transactionRequest.txid)) {
+                        is Response.Success -> response.result
+                        is Response.Failure ->
+                            when {
+                                response is Response.Failure.Server.NotFound -> null
+                                response.description.orEmpty().contains(NOT_FOUND_MESSAGE_WORKAROUND, true) ->
+                                    null
+                                response.description.orEmpty().contains(NOT_FOUND_MESSAGE_WORKAROUND_2, true) ->
+                                    null
+                                else -> throw EnhanceTxDownloadError(response.toThrowable())
+                            }
                     }
-                }
             }
             traceScope.end()
-            // Result is fetched or EnhanceTxDownloadError is thrown after all attempts failed at this point
-            return transactionDataResult!!
+            return transactionResult
         }
 
         @Throws(EnhanceTxDecryptError::class)
         private suspend fun decryptTransaction(
-            transactionData: ByteArray,
-            minedHeight: BlockHeight,
+            rawTransaction: RawTransaction,
             backend: TypesafeBackend,
         ) {
             val traceScope = TraceScope("CompactBlockProcessor.decryptTransaction")
             runCatching {
-                backend.decryptAndStoreTransaction(transactionData)
+                backend.decryptAndStoreTransaction(rawTransaction.data, rawTransaction.height)
             }.onFailure {
                 traceScope.end()
-                throw EnhanceTxDecryptError(minedHeight, it)
+                throw EnhanceTxDecryptError(rawTransaction.height, it)
+            }
+            traceScope.end()
+        }
+
+        @Throws(EnhanceTxDataRequestsError::class)
+        private suspend fun transactionDataRequests(backend: TypesafeBackend): List<TransactionDataRequest> {
+            val traceScope = TraceScope("CompactBlockProcessor.transactionDataRequests")
+            val result =
+                runCatching {
+                    backend.transactionDataRequests()
+                }.getOrElse {
+                    traceScope.end()
+                    throw EnhanceTxDataRequestsError(it)
+                }
+            traceScope.end()
+            return result
+        }
+
+        @Throws(EnhanceTxSetStatusError::class)
+        private suspend fun setTransactionStatus(
+            transactionRawId: ByteArray,
+            status: TransactionStatus,
+            backend: TypesafeBackend,
+        ) {
+            val traceScope = TraceScope("CompactBlockProcessor.setTransactionStatus")
+            runCatching {
+                backend.setTransactionStatus(transactionRawId, status)
+            }.onFailure {
+                traceScope.end()
+                throw EnhanceTxSetStatusError(it)
             }
             traceScope.end()
         }
@@ -2394,3 +2585,7 @@ class CompactBlockProcessor internal constructor(
         }
     }
 }
+
+private const val NOT_FOUND_MESSAGE_WORKAROUND = "Transaction not found"
+private const val NOT_FOUND_MESSAGE_WORKAROUND_2 =
+    "No such mempool or blockchain transaction. Use gettransaction for wallet transactions."
diff --git a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/block/processor/model/SyncingResult.kt b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/block/processor/model/SyncingResult.kt
index 3824d236c..b11b88cc1 100644
--- a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/block/processor/model/SyncingResult.kt
+++ b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/block/processor/model/SyncingResult.kt
@@ -61,7 +61,7 @@ internal sealed class SyncingResult {
     data object FetchUtxos : SyncingResult()
 
     data class EnhanceFailed(
-        override val failedAtHeight: BlockHeight,
+        override val failedAtHeight: BlockHeight? = null,
         override val exception: CompactBlockProcessorException
     ) : Failure, SyncingResult()
 
diff --git a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/exception/Exceptions.kt b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/exception/Exceptions.kt
index bbb7000a9..3d3115df1 100644
--- a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/exception/Exceptions.kt
+++ b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/exception/Exceptions.kt
@@ -98,26 +98,35 @@ sealed class CompactBlockProcessorException(message: String, cause: Throwable? =
 
     open class EnhanceTransactionError(
         message: String,
-        val height: BlockHeight,
+        val height: BlockHeight?,
         cause: Throwable
     ) : CompactBlockProcessorException(message, cause) {
-        class EnhanceTxDownloadError(
-            height: BlockHeight,
-            cause: Throwable
-        ) : EnhanceTransactionError(
-                "Error while attempting to download a transaction to enhance",
-                height,
-                cause
-            )
+        class EnhanceTxDownloadError(cause: Throwable) : EnhanceTransactionError(
+            "Error while attempting to download a transaction to enhance",
+            null,
+            cause
+        )
 
         class EnhanceTxDecryptError(
-            height: BlockHeight,
+            height: BlockHeight?,
             cause: Throwable
         ) : EnhanceTransactionError(
                 "Error while attempting to decrypt and store a transaction to enhance",
                 height,
                 cause
             )
+
+        class EnhanceTxSetStatusError(cause: Throwable) : EnhanceTransactionError(
+            "Error while attempting to set status of a transaction to the Rust backend",
+            null,
+            cause
+        )
+
+        class EnhanceTxDataRequestsError(cause: Throwable) : EnhanceTransactionError(
+            "Error while attempting to request transactions data from the Rust backend",
+            null,
+            cause
+        )
     }
 
     class MismatchedNetwork(clientNetwork: String?, serverNetwork: String?) : CompactBlockProcessorException(
@@ -281,6 +290,12 @@ sealed class LightWalletException(message: String, cause: Throwable? = null) : S
         "Failed to fetch latest block height with code: $code due to: ${description ?: "-"}",
         cause
     )
+
+    class GetTAddressTransactionsException(code: Int, description: String?, cause: Throwable) : SdkException(
+        "Failed to get transactions belonging to the given transparent address with code: $code due" +
+            " to: ${description ?: "-"}",
+        cause
+    )
 }
 
 /**
diff --git a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/Files.kt b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/Files.kt
index 81ece20a8..62b91d06d 100644
--- a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/Files.kt
+++ b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/Files.kt
@@ -19,6 +19,11 @@ internal object Files {
      */
     const val NO_BACKUP_SUBDIRECTORY = "co.electricoin.zcash" // $NON-NLS
 
+    /**
+     * Subdirectory under [NO_BACKUP_SUBDIRECTORY] for Tor client data.
+     */
+    const val TOR_SUBDIR = "tor"
+
     private val accessMutex = Mutex()
 
     /**
@@ -44,4 +49,8 @@ internal object Files {
         }
         return dir
     }
+
+    suspend fun getTorDir(context: Context): File {
+        return File(getZcashNoBackupSubdirectory(context), TOR_SUBDIR)
+    }
 }
diff --git a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/TypesafeBackend.kt b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/TypesafeBackend.kt
index 2bc955f68..7943abee2 100644
--- a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/TypesafeBackend.kt
+++ b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/TypesafeBackend.kt
@@ -6,6 +6,8 @@ import cash.z.ecc.android.sdk.internal.model.JniBlockMeta
 import cash.z.ecc.android.sdk.internal.model.ScanRange
 import cash.z.ecc.android.sdk.internal.model.ScanSummary
 import cash.z.ecc.android.sdk.internal.model.SubtreeRoot
+import cash.z.ecc.android.sdk.internal.model.TransactionDataRequest
+import cash.z.ecc.android.sdk.internal.model.TransactionStatus
 import cash.z.ecc.android.sdk.internal.model.TreeState
 import cash.z.ecc.android.sdk.internal.model.WalletSummary
 import cash.z.ecc.android.sdk.internal.model.ZcashProtocol
@@ -32,13 +34,13 @@ internal interface TypesafeBackend {
         account: Account,
         to: String,
         value: Long,
-        memo: ByteArray? = byteArrayOf()
+        memo: ByteArray? = null
     ): Proposal
 
     suspend fun proposeShielding(
         account: Account,
         shieldingThreshold: Long,
-        memo: ByteArray? = byteArrayOf(),
+        memo: ByteArray? = null,
         transparentReceiver: String? = null
     ): Proposal?
 
@@ -137,6 +139,12 @@ internal interface TypesafeBackend {
         limit: Long
     ): ScanSummary
 
+    /**
+     * @throws RuntimeException as a common indicator of the operation failure
+     */
+    @Throws(RuntimeException::class)
+    suspend fun transactionDataRequests(): List<TransactionDataRequest>
+
     /**
      * @throws RuntimeException as a common indicator of the operation failure
      */
@@ -149,7 +157,15 @@ internal interface TypesafeBackend {
     @Throws(RuntimeException::class)
     suspend fun suggestScanRanges(): List<ScanRange>
 
-    suspend fun decryptAndStoreTransaction(tx: ByteArray)
+    suspend fun decryptAndStoreTransaction(
+        tx: ByteArray,
+        minedHeight: BlockHeight?
+    )
+
+    suspend fun setTransactionStatus(
+        txId: ByteArray,
+        status: TransactionStatus,
+    )
 
     fun getSaplingReceiver(ua: String): String?
 
@@ -168,4 +184,10 @@ internal interface TypesafeBackend {
     fun isValidTransparentAddr(addr: String): Boolean
 
     fun isValidUnifiedAddr(addr: String): Boolean
+
+    /**
+     * @throws RuntimeException as a common indicator of the operation failure
+     */
+    @Throws(RuntimeException::class)
+    fun isValidTexAddr(addr: String): Boolean
 }
diff --git a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/TypesafeBackendImpl.kt b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/TypesafeBackendImpl.kt
index 92ebfcc9b..34c732dba 100644
--- a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/TypesafeBackendImpl.kt
+++ b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/TypesafeBackendImpl.kt
@@ -7,6 +7,8 @@ import cash.z.ecc.android.sdk.internal.model.JniSubtreeRoot
 import cash.z.ecc.android.sdk.internal.model.ScanRange
 import cash.z.ecc.android.sdk.internal.model.ScanSummary
 import cash.z.ecc.android.sdk.internal.model.SubtreeRoot
+import cash.z.ecc.android.sdk.internal.model.TransactionDataRequest
+import cash.z.ecc.android.sdk.internal.model.TransactionStatus
 import cash.z.ecc.android.sdk.internal.model.TreeState
 import cash.z.ecc.android.sdk.internal.model.WalletSummary
 import cash.z.ecc.android.sdk.internal.model.ZcashProtocol
@@ -231,6 +233,14 @@ internal class TypesafeBackendImpl(private val backend: Backend) : TypesafeBacke
         limit: Long
     ): ScanSummary = ScanSummary.new(backend.scanBlocks(fromHeight.value, fromState.encoded, limit), network)
 
+    override suspend fun transactionDataRequests(): List<TransactionDataRequest> =
+        backend.transactionDataRequests().map { jniRequest ->
+            TransactionDataRequest.new(
+                jniRequest,
+                network
+            )
+        }
+
     override suspend fun getWalletSummary(): WalletSummary? =
         backend.getWalletSummary()?.let { jniWalletSummary ->
             WalletSummary.new(jniWalletSummary)
@@ -244,7 +254,19 @@ internal class TypesafeBackendImpl(private val backend: Backend) : TypesafeBacke
             )
         }
 
-    override suspend fun decryptAndStoreTransaction(tx: ByteArray) = backend.decryptAndStoreTransaction(tx)
+    override suspend fun decryptAndStoreTransaction(
+        tx: ByteArray,
+        minedHeight: BlockHeight?
+    ) = backend
+        .decryptAndStoreTransaction(tx, minedHeight?.value)
+
+    override suspend fun setTransactionStatus(
+        txId: ByteArray,
+        status: TransactionStatus
+    ) = backend.setTransactionStatus(
+        txId = txId,
+        status = status.toPrimitiveValue()
+    )
 
     override fun getSaplingReceiver(ua: String): String? = backend.getSaplingReceiver(ua)
 
@@ -262,4 +284,6 @@ internal class TypesafeBackendImpl(private val backend: Backend) : TypesafeBacke
     override fun isValidTransparentAddr(addr: String): Boolean = backend.isValidTransparentAddr(addr)
 
     override fun isValidUnifiedAddr(addr: String): Boolean = backend.isValidUnifiedAddr(addr)
+
+    override fun isValidTexAddr(addr: String): Boolean = backend.isValidTexAddr(addr)
 }
diff --git a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/block/CompactBlockDownloader.kt b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/block/CompactBlockDownloader.kt
index 950aec877..789c54764 100644
--- a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/block/CompactBlockDownloader.kt
+++ b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/block/CompactBlockDownloader.kt
@@ -150,6 +150,42 @@ open class CompactBlockDownloader private constructor(val compactBlockRepository
      */
     suspend fun fetchTransaction(txId: ByteArray) = lightWalletClient.fetchTransaction(txId)
 
+    /**
+     * Get transactions belonging to the given transparent address
+     *
+     * @throws LightWalletException.GetTAddressTransactionsException if any error while getting the transactions occurs
+     * @return List of all the transaction belonging to the given transparent address on the given block range
+     */
+    fun getTAddressTransactions(
+        transparentAddress: String,
+        blockHeightRange: ClosedRange<BlockHeight>
+    ) = lightWalletClient.getTAddressTransactions(
+        tAddress = transparentAddress,
+        blockHeightRange =
+            BlockHeightUnsafe.from(blockHeightRange.start)..BlockHeightUnsafe.from(blockHeightRange.endInclusive)
+    ).map { response ->
+        when (response) {
+            is Response.Success -> {
+                Twig.verbose { "Get a new rawTransactionUnsafe successfully" }
+                response.result
+            }
+            is Response.Failure -> {
+                Twig.error(response.toThrowable()) { "Getting a new rawTransactionUnsafe failed" }
+                throw LightWalletException.GetTAddressTransactionsException(
+                    response.code,
+                    response.description,
+                    response.toThrowable()
+                )
+            }
+        }
+    }.onCompletion { error ->
+        if (error != null) {
+            Twig.error(error) { "Getting list of rawTransactionUnsafe failed" }
+        } else {
+            Twig.debug { "All rawTransactionUnsafe got successfully" }
+        }
+    }
+
     /**
      * Fetch all UTXOs for the given addresses and from the given height.
      *
@@ -168,7 +204,7 @@ open class CompactBlockDownloader private constructor(val compactBlockRepository
      *
      * @return a flow of information about roots of subtrees of the Sapling and Orchard note commitment trees.
      */
-    suspend fun getSubtreeRoots(
+    fun getSubtreeRoots(
         startIndex: UInt,
         shieldedProtocol: ShieldedProtocolEnum,
         maxEntries: UInt
diff --git a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/db/derived/AllTransactionView.kt b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/db/derived/AllTransactionView.kt
index cfffb7038..f3ba35cbd 100644
--- a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/db/derived/AllTransactionView.kt
+++ b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/db/derived/AllTransactionView.kt
@@ -57,15 +57,6 @@ internal class AllTransactionView(
                 AllTransactionViewDefinition.COLUMN_INTEGER_MINED_HEIGHT
             )
 
-        private val SELECTION_BLOCK_RANGE =
-            String.format(
-                Locale.ROOT,
-                // $NON-NLS
-                "%s >= ? AND %s <= ?",
-                AllTransactionViewDefinition.COLUMN_INTEGER_MINED_HEIGHT,
-                AllTransactionViewDefinition.COLUMN_INTEGER_MINED_HEIGHT
-            )
-
         private val SELECTION_RAW_IS_NULL =
             String.format(
                 Locale.ROOT,
@@ -148,16 +139,6 @@ internal class AllTransactionView(
             cursorParser = cursorParser
         )
 
-    fun getTransactionRange(blockHeightRange: ClosedRange<BlockHeight>) =
-        sqliteDatabase.queryAndMap(
-            table = AllTransactionViewDefinition.VIEW_NAME,
-            columns = COLUMNS,
-            orderBy = ORDER_BY,
-            selection = SELECTION_BLOCK_RANGE,
-            selectionArgs = arrayOf(blockHeightRange.start.value, blockHeightRange.endInclusive.value),
-            cursorParser = cursorParser
-        )
-
     suspend fun getOldestTransaction() =
         sqliteDatabase.queryAndMap(
             table = AllTransactionViewDefinition.VIEW_NAME,
diff --git a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/db/derived/DbDerivedDataRepository.kt b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/db/derived/DbDerivedDataRepository.kt
index 8542872ec..de8152665 100644
--- a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/db/derived/DbDerivedDataRepository.kt
+++ b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/db/derived/DbDerivedDataRepository.kt
@@ -26,9 +26,6 @@ internal class DbDerivedDataRepository(
         return derivedDataDb.transactionTable.findEncodedTransactionByTxId(txId)
     }
 
-    override suspend fun findNewTransactions(blockHeightRange: ClosedRange<BlockHeight>): List<DbTransactionOverview> =
-        derivedDataDb.allTransactionView.getTransactionRange(blockHeightRange).toList()
-
     override suspend fun getOldestTransaction() = derivedDataDb.allTransactionView.getOldestTransaction()
 
     override suspend fun findMinedHeight(rawTransactionId: ByteArray) =
diff --git a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/exchange/UsdExchangeRateFetcher.kt b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/exchange/UsdExchangeRateFetcher.kt
new file mode 100644
index 000000000..2fcc520d8
--- /dev/null
+++ b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/exchange/UsdExchangeRateFetcher.kt
@@ -0,0 +1,84 @@
+package cash.z.ecc.android.sdk.internal.exchange
+
+import cash.z.ecc.android.sdk.internal.Twig
+import cash.z.ecc.android.sdk.internal.model.TorClient
+import cash.z.ecc.android.sdk.model.FetchFiatCurrencyResult
+import cash.z.ecc.android.sdk.model.FiatCurrencyConversion
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.coroutines.sync.withLock
+import kotlinx.datetime.Clock
+import java.io.File
+
+internal class UsdExchangeRateFetcher(torDir: File) {
+    private val torHolder = TorClientHolder(torDir)
+
+    @Suppress("TooGenericExceptionCaught", "ReturnCount")
+    suspend operator fun invoke(): FetchFiatCurrencyResult {
+        return retry {
+            val rate =
+                try {
+                    Twig.info { "[USD] Fetch start" }
+                    torHolder().getExchangeRateUsd()
+                } catch (e: Exception) {
+                    Twig.error(e) { "[USD] Fetch failed" }
+                    return FetchFiatCurrencyResult.Error(e)
+                }
+
+            Twig.debug { "[USD] Fetch success: $rate" }
+
+            FetchFiatCurrencyResult.Success(
+                currencyConversion =
+                    FiatCurrencyConversion(
+                        priceOfZec = rate.toDouble(),
+                        timestamp = Clock.System.now()
+                    )
+            )
+        }
+    }
+
+    suspend fun dispose() {
+        torHolder.dispose()
+    }
+
+    /**
+     * Retry with geometric order.
+     */
+    @Suppress("TooGenericExceptionCaught", "ReturnCount", "SwallowedException")
+    private suspend inline fun <T> retry(
+        times: Int = 3,
+        initialDelay: Long = 1000,
+        multiplier: Double = 2.0,
+        block: () -> T,
+    ): T {
+        var currentDelay = initialDelay
+        repeat(times - 1) {
+            try {
+                return block()
+            } catch (e: Exception) {
+                Twig.debug(e) { "[USD] Fetching attempt failed" }
+            }
+            delay(currentDelay)
+            currentDelay = (currentDelay * multiplier).toLong()
+        }
+        return block() // last attempt
+    }
+}
+
+private class TorClientHolder(private val torDir: File) {
+    private val mutex = Mutex()
+    private var torClient: TorClient? = null
+
+    suspend operator fun invoke(): TorClient =
+        mutex.withLock {
+            if (torClient == null) {
+                torClient = TorClient.new(torDir)
+            }
+            return torClient!!
+        }
+
+    suspend fun dispose() =
+        mutex.withLock {
+            torClient?.dispose()
+        }
+}
diff --git a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/model/TransactionDataRequest.kt b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/model/TransactionDataRequest.kt
new file mode 100644
index 000000000..2ab5bfb13
--- /dev/null
+++ b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/model/TransactionDataRequest.kt
@@ -0,0 +1,61 @@
+package cash.z.ecc.android.sdk.internal.model
+
+import cash.z.ecc.android.sdk.exception.SdkException
+import cash.z.ecc.android.sdk.internal.ext.toHexReversed
+import cash.z.ecc.android.sdk.model.BlockHeight
+import cash.z.ecc.android.sdk.model.ZcashNetwork
+
+/**
+ * Serves as cross layer (Kotlin, Rust) communication class.
+ */
+sealed interface TransactionDataRequest {
+    sealed class EnhancementRequired(open val txid: ByteArray) : TransactionDataRequest {
+        abstract fun txIdString(): String
+    }
+
+    data class GetStatus(override val txid: ByteArray) : EnhancementRequired(txid) {
+        override fun txIdString() = txid.toHexReversed()
+    }
+
+    data class Enhancement(override val txid: ByteArray) : EnhancementRequired(txid) {
+        override fun txIdString() = txid.toHexReversed()
+    }
+
+    data class SpendsFromAddress(
+        val address: String,
+        val startHeight: BlockHeight,
+        val endHeight: BlockHeight?,
+    ) : TransactionDataRequest {
+        init {
+            if (endHeight != null) {
+                require(endHeight >= startHeight) {
+                    "End height $endHeight must not be less than start height $startHeight."
+                }
+            }
+        }
+    }
+
+    companion object {
+        fun new(
+            jni: JniTransactionDataRequest,
+            zcashNetwork: ZcashNetwork
+        ): TransactionDataRequest {
+            return when (jni) {
+                is JniTransactionDataRequest.GetStatus -> GetStatus(jni.txid)
+                is JniTransactionDataRequest.Enhancement -> Enhancement(jni.txid)
+                is JniTransactionDataRequest.SpendsFromAddress ->
+                    SpendsFromAddress(
+                        jni.address,
+                        BlockHeight.new(zcashNetwork, jni.startHeight),
+                        if (jni.endHeight == -1L) {
+                            null
+                        } else {
+                            BlockHeight.new(zcashNetwork, jni.endHeight)
+                        }
+                    )
+
+                else -> throw SdkException("Unknown JniTransactionDataRequest variant", cause = null)
+            }
+        }
+    }
+}
diff --git a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/model/TransactionStatus.kt b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/model/TransactionStatus.kt
new file mode 100644
index 000000000..f9c7c9e0e
--- /dev/null
+++ b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/model/TransactionStatus.kt
@@ -0,0 +1,23 @@
+package cash.z.ecc.android.sdk.internal.model
+
+import cash.z.ecc.android.sdk.model.BlockHeight
+
+sealed class TransactionStatus {
+    abstract fun toPrimitiveValue(): Long
+
+    data class Mined(val height: BlockHeight) : TransactionStatus() {
+        override fun toPrimitiveValue() = height.value
+    }
+
+    data object NotInMainChain : TransactionStatus() {
+        private const val NOT_IN_MAIN_CHAIN = -1L
+
+        override fun toPrimitiveValue() = NOT_IN_MAIN_CHAIN
+    }
+
+    data object TxidNotRecognized : TransactionStatus() {
+        private const val TXID_NOT_RECOGNIZED = -2L
+
+        override fun toPrimitiveValue() = TXID_NOT_RECOGNIZED
+    }
+}
diff --git a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/model/ext/RawTransactionUnsafeExt.kt b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/model/ext/RawTransactionUnsafeExt.kt
new file mode 100644
index 000000000..d42b49de2
--- /dev/null
+++ b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/model/ext/RawTransactionUnsafeExt.kt
@@ -0,0 +1,16 @@
+package cash.z.ecc.android.sdk.internal.model.ext
+
+import cash.z.ecc.android.sdk.internal.model.TransactionStatus
+import cash.z.ecc.android.sdk.model.ZcashNetwork
+import co.electriccoin.lightwallet.client.model.RawTransactionUnsafe
+import co.electriccoin.lightwallet.client.model.RawTransactionUnsafe.MainChain
+import co.electriccoin.lightwallet.client.model.RawTransactionUnsafe.Mempool
+import co.electriccoin.lightwallet.client.model.RawTransactionUnsafe.OrphanedBlock
+
+internal fun RawTransactionUnsafe.toTransactionStatus(network: ZcashNetwork): TransactionStatus {
+    return when (this) {
+        is MainChain -> TransactionStatus.Mined(height.toBlockHeight(network))
+        is Mempool -> TransactionStatus.NotInMainChain
+        is OrphanedBlock -> TransactionStatus.NotInMainChain
+    }
+}
diff --git a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/repository/DerivedDataRepository.kt b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/repository/DerivedDataRepository.kt
index 286a20364..ec0496446 100644
--- a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/repository/DerivedDataRepository.kt
+++ b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/repository/DerivedDataRepository.kt
@@ -30,19 +30,6 @@ internal interface DerivedDataRepository {
      */
     suspend fun findEncodedTransactionByTxId(txId: FirstClassByteArray): EncodedTransaction?
 
-    /**
-     * Find all the newly scanned transactions in the given range, including transactions (like
-     * change or those only identified by nullifiers) which should not appear in the UI. This method
-     * is intended for use after a scan, in order to collect all the transactions that were
-     * discovered and then enhance them with additional details. It returns a list to signal that
-     * the intention is not to add them to a recyclerview or otherwise show in the UI.
-     *
-     * @param blockHeightRange the range of blocks to check for transactions.
-     *
-     * @return a list of transactions that were mined in the given range, inclusive.
-     */
-    suspend fun findNewTransactions(blockHeightRange: ClosedRange<BlockHeight>): List<DbTransactionOverview>
-
     suspend fun getOldestTransaction(): DbTransactionOverview?
 
     /**
diff --git a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/transaction/OutboundTransactionManager.kt b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/transaction/OutboundTransactionManager.kt
index fcc9b3e24..9fa49b118 100644
--- a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/transaction/OutboundTransactionManager.kt
+++ b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/transaction/OutboundTransactionManager.kt
@@ -127,6 +127,15 @@ internal interface OutboundTransactionManager {
      * @return true when the given address is a valid ZIP 316 Unified Address.
      */
     suspend fun isValidUnifiedAddress(address: String): Boolean
+
+    /**
+     * Return true when the given address is a valid ZIP 320 TEX address.
+     *
+     * @param address the address to validate.
+     *
+     * @return true when the given address is a valid ZIP 320 TEX address.
+     */
+    suspend fun isValidTexAddress(address: String): Boolean
 }
 
 /**
diff --git a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/transaction/OutboundTransactionManagerImpl.kt b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/transaction/OutboundTransactionManagerImpl.kt
index 77404e566..15fbe419f 100644
--- a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/transaction/OutboundTransactionManagerImpl.kt
+++ b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/transaction/OutboundTransactionManagerImpl.kt
@@ -24,12 +24,18 @@ internal class OutboundTransactionManagerImpl(
         memo: String,
         account: Account
     ): EncodedTransaction {
+        val memoBytes =
+            if (memo.isBlank()) {
+                null
+            } else {
+                memo.toByteArray()
+            }
         return when (recipient) {
             is TransactionRecipient.Account -> {
                 encoder.createShieldingTransaction(
                     usk,
                     recipient,
-                    memo.toByteArray()
+                    memoBytes
                 )
             }
             is TransactionRecipient.Address -> {
@@ -37,7 +43,7 @@ internal class OutboundTransactionManagerImpl(
                     usk,
                     amount,
                     recipient,
-                    memo.toByteArray()
+                    memoBytes
                 )
             }
         }
@@ -48,14 +54,30 @@ internal class OutboundTransactionManagerImpl(
         recipient: String,
         amount: Zatoshi,
         memo: String
-    ): Proposal = encoder.proposeTransfer(account, recipient, amount, memo.toByteArray())
+    ): Proposal {
+        val memoBytes =
+            if (memo.isBlank()) {
+                null
+            } else {
+                memo.toByteArray()
+            }
+        return encoder.proposeTransfer(account, recipient, amount, memoBytes)
+    }
 
     override suspend fun proposeShielding(
         account: Account,
         shieldingThreshold: Zatoshi,
         memo: String,
         transparentReceiver: String?
-    ): Proposal? = encoder.proposeShielding(account, shieldingThreshold, memo.toByteArray(), transparentReceiver)
+    ): Proposal? {
+        val memoBytes =
+            if (memo.isBlank()) {
+                null
+            } else {
+                memo.toByteArray()
+            }
+        return encoder.proposeShielding(account, shieldingThreshold, memoBytes, transparentReceiver)
+    }
 
     override suspend fun createProposedTransactions(
         proposal: Proposal,
@@ -107,6 +129,8 @@ internal class OutboundTransactionManagerImpl(
 
     override suspend fun isValidUnifiedAddress(address: String) = encoder.isValidUnifiedAddress(address)
 
+    override suspend fun isValidTexAddress(address: String) = encoder.isValidTexAddress(address)
+
     //
     // Helper functions
     //
diff --git a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/transaction/TransactionEncoder.kt b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/transaction/TransactionEncoder.kt
index c0aa8ceac..4cd0ba132 100644
--- a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/transaction/TransactionEncoder.kt
+++ b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/transaction/TransactionEncoder.kt
@@ -125,6 +125,16 @@ internal interface TransactionEncoder {
      */
     suspend fun isValidUnifiedAddress(address: String): Boolean
 
+    /**
+     * Utility function to help with validation. This is not called during [createTransaction]
+     * because this class asserts that all validation is done externally by the UI, for now.
+     *
+     * @param address the address to validate
+     *
+     * @return true when the given address is a valid ZIP 320 TEX address
+     */
+    suspend fun isValidTexAddress(address: String): Boolean
+
     /**
      * Return the consensus branch that the encoder is using when making transactions.
      *
diff --git a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/transaction/TransactionEncoderImpl.kt b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/transaction/TransactionEncoderImpl.kt
index 39e12bae4..0566d428a 100644
--- a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/transaction/TransactionEncoderImpl.kt
+++ b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/transaction/TransactionEncoderImpl.kt
@@ -169,6 +169,16 @@ internal class TransactionEncoderImpl(
      */
     override suspend fun isValidUnifiedAddress(address: String): Boolean = backend.isValidUnifiedAddr(address)
 
+    /**
+     * Utility function to help with validation. This is not called during [createTransaction]
+     * because this class asserts that all validation is done externally by the UI, for now.
+     *
+     * @param address the address to validate
+     *
+     * @return true when the given address is a valid ZIP 320 TEX address
+     */
+    override suspend fun isValidTexAddress(address: String): Boolean = backend.isValidTexAddr(address)
+
     /**
      * Return the consensus branch that the encoder is using when making transactions.
      *
@@ -201,7 +211,7 @@ internal class TransactionEncoderImpl(
         usk: UnifiedSpendingKey,
         amount: Zatoshi,
         toAddress: String,
-        memo: ByteArray? = byteArrayOf()
+        memo: ByteArray? = null
     ): FirstClassByteArray {
         Twig.debug {
             "creating transaction to spend $amount zatoshi to" +
@@ -230,7 +240,7 @@ internal class TransactionEncoderImpl(
 
     private suspend fun createShieldingSpend(
         usk: UnifiedSpendingKey,
-        memo: ByteArray? = byteArrayOf()
+        memo: ByteArray? = null
     ): FirstClassByteArray {
         return runCatching {
             saplingParamTool.ensureParams(saplingParamTool.properties.paramsDirectory)
diff --git a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/model/FetchFiatCurrencyResult.kt b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/model/FetchFiatCurrencyResult.kt
new file mode 100644
index 000000000..acc886eb2
--- /dev/null
+++ b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/model/FetchFiatCurrencyResult.kt
@@ -0,0 +1,10 @@
+package cash.z.ecc.android.sdk.model
+
+internal sealed interface FetchFiatCurrencyResult {
+    val fiatCurrency: FiatCurrency
+        get() = FiatCurrency.USD
+
+    data class Success(val currencyConversion: FiatCurrencyConversion) : FetchFiatCurrencyResult
+
+    data class Error(val exception: Exception) : FetchFiatCurrencyResult
+}
diff --git a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/model/FiatCurrency.kt b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/model/FiatCurrency.kt
new file mode 100644
index 000000000..b734d779d
--- /dev/null
+++ b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/model/FiatCurrency.kt
@@ -0,0 +1,34 @@
+package cash.z.ecc.android.sdk.model
+
+import android.icu.util.Currency
+
+data class FiatCurrency(val code: String) {
+    val symbol: String
+        get() = Currency.getInstance(code).symbol
+
+    init {
+        check(isAlpha3Code(code))
+    }
+
+    companion object Factory {
+        val USD = FiatCurrency("USD")
+
+        /**
+         * Checks whether [code] complies with ISO 4217 3-letter code.
+         */
+        @Suppress("ReturnCount", "MagicNumber")
+        fun isAlpha3Code(code: String): Boolean {
+            if (code.length != 3) {
+                return false
+            } else {
+                for (i in 0..2) {
+                    val ch = code[i]
+                    if (ch < 'A' || (ch in '['..'`') || ch > 'z') {
+                        return false
+                    }
+                }
+            }
+            return true
+        }
+    }
+}
diff --git a/sdk-incubator-lib/src/main/java/cash/z/ecc/android/sdk/model/CurrencyConversion.kt b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/model/FiatCurrencyConversion.kt
similarity index 58%
rename from sdk-incubator-lib/src/main/java/cash/z/ecc/android/sdk/model/CurrencyConversion.kt
rename to sdk-lib/src/main/java/cash/z/ecc/android/sdk/model/FiatCurrencyConversion.kt
index 5df0c68f7..b956468e7 100644
--- a/sdk-incubator-lib/src/main/java/cash/z/ecc/android/sdk/model/CurrencyConversion.kt
+++ b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/model/FiatCurrencyConversion.kt
@@ -10,26 +10,16 @@ import kotlinx.datetime.Instant
  * the server so it shouldn't have issues with client-side clock inaccuracy.
  * @param priceOfZec The conversion rate of ZEC to the fiat currency.
  */
-data class CurrencyConversion(
-    val fiatCurrency: FiatCurrency,
+data class FiatCurrencyConversion(
     val timestamp: Instant,
     val priceOfZec: Double
 ) {
+    val fiatCurrency: FiatCurrency = FiatCurrency.USD
+
     init {
         require(priceOfZec > 0) { "priceOfZec must be greater than 0" }
         require(priceOfZec.isFinite()) { "priceOfZec must be finite" }
     }
-}
 
-/**
- * Represents an ISO 4217 currency code.
- */
-@Suppress("MagicNumber")
-data class FiatCurrency(val code: String) {
-    init {
-        require(code.length == 3) { "Fiat currency code must be 3 characters long." }
-
-        // TODO [#532]: Add another check to make sure the code is in the known ISO currency code list.
-        // TODO [#532]: https://github.com/zcash/secant-android-wallet/issues/532
-    }
+    companion object
 }
diff --git a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/model/ObserveFiatCurrencyResult.kt b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/model/ObserveFiatCurrencyResult.kt
new file mode 100644
index 000000000..b8925358c
--- /dev/null
+++ b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/model/ObserveFiatCurrencyResult.kt
@@ -0,0 +1,6 @@
+package cash.z.ecc.android.sdk.model
+
+data class ObserveFiatCurrencyResult(
+    val isLoading: Boolean = true,
+    val currencyConversion: FiatCurrencyConversion? = null,
+)
diff --git a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/model/RawTransaction.kt b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/model/RawTransaction.kt
new file mode 100644
index 000000000..6e300632d
--- /dev/null
+++ b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/model/RawTransaction.kt
@@ -0,0 +1,56 @@
+package cash.z.ecc.android.sdk.model
+
+import cash.z.ecc.android.sdk.internal.model.ext.toBlockHeight
+import cash.z.ecc.android.sdk.model.RawTransaction.Companion.new
+import co.electriccoin.lightwallet.client.model.RawTransactionUnsafe
+
+/**
+ * Represents a safe type transaction object obtained from Light wallet server. It contains complete transaction data.
+ *
+ * New instances are constructed using the [new] factory method.
+ *
+ * @param data The complete data of the transaction.
+ * @param height The transaction mined height.
+ */
+data class RawTransaction internal constructor(
+    val data: ByteArray,
+    val height: BlockHeight?
+) {
+    init {
+        require(data.isNotEmpty()) { "Empty RawTransaction data" }
+    }
+
+    companion object {
+        fun new(
+            rawTransactionUnsafe: RawTransactionUnsafe,
+            network: ZcashNetwork
+        ): RawTransaction {
+            return RawTransaction(
+                data = rawTransactionUnsafe.data,
+                height =
+                    when (rawTransactionUnsafe) {
+                        is RawTransactionUnsafe.MainChain -> rawTransactionUnsafe.height.toBlockHeight(network)
+                        else -> null
+                    }
+            )
+        }
+    }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (javaClass != other?.javaClass) return false
+
+        other as RawTransaction
+
+        if (!data.contentEquals(other.data)) return false
+        if (height != other.height) return false
+
+        return true
+    }
+
+    override fun hashCode(): Int {
+        var result = data.contentHashCode()
+        result = 31 * result + height.hashCode()
+        return result
+    }
+}
diff --git a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/type/AddressType.kt b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/type/AddressType.kt
index ff4804b78..e41fdd70b 100644
--- a/sdk-lib/src/main/java/cash/z/ecc/android/sdk/type/AddressType.kt
+++ b/sdk-lib/src/main/java/cash/z/ecc/android/sdk/type/AddressType.kt
@@ -26,6 +26,11 @@ sealed class AddressType {
      */
     object Unified : Valid, AddressType()
 
+    /**
+     * An instance of [AddressType] corresponding to a valid ZIP 320 TEX address.
+     */
+    object Tex : Valid, AddressType()
+
     /**
      * An instance of [AddressType] corresponding to an invalid address.
      *