diff --git a/api.json b/api.json
index f051ebe..faffc3f 100644
--- a/api.json
+++ b/api.json
@@ -1370,10 +1370,11 @@
         }
       },
      "CurveType": {
-       "description":"CurveType is the type of cryptographic curve associated with a PublicKey. * secp256k1: SEC compressed - `33 bytes` (https://secg.org/sec1-v2.pdf#subsubsection.2.3.3) * secp256r1: SEC compressed - `33 bytes` (https://secg.org/sec1-v2.pdf#subsubsection.2.3.3) * edwards25519: `y (255-bits) || x-sign-bit (1-bit)` - `32 bytes` (https://ed25519.cr.yp.to/ed25519-20110926.pdf) * tweedle: 1st pk : Fq.t (32 bytes) || 2nd pk : Fq.t (32 bytes) (https://github.com/CodaProtocol/coda/blob/develop/rfcs/0038-rosetta-construction-api.md#marshal-keys) * pallas: `x (255 bits) || y-parity-bit (1-bit) - 32 bytes` (https://github.com/zcash/pasta)",
+       "description":"CurveType is the type of cryptographic curve associated with a PublicKey. * secp256k1: SEC compressed - `33 bytes` (https://secg.org/sec1-v2.pdf#subsubsection.2.3.3) * secp256k1_bip340: x-only - `32 bytes`  (implicitly even `Y` coord. Secp256k1 compressed keys may be repurposed by dropping the first byte. (https://github.com/bitcoin/bips/blob/master/bip-0340.mediawiki#Public_Key_Generation)) * secp256r1: SEC compressed - `33 bytes` (https://secg.org/sec1-v2.pdf#subsubsection.2.3.3) * edwards25519: `y (255-bits) || x-sign-bit (1-bit)` - `32 bytes` (https://ed25519.cr.yp.to/ed25519-20110926.pdf) * tweedle: 1st pk : Fq.t (32 bytes) || 2nd pk : Fq.t (32 bytes) (https://github.com/CodaProtocol/coda/blob/develop/rfcs/0038-rosetta-construction-api.md#marshal-keys) * pallas: `x (255 bits) || y-parity-bit (1-bit) - 32 bytes` (https://github.com/zcash/pasta)",
        "type":"string",
        "enum": [
          "secp256k1",
+         "secp256k1_bip340",
          "secp256r1",
          "edwards25519",
          "tweedle",
@@ -1428,13 +1429,14 @@
         }
       },
      "SignatureType": {
-       "description":"SignatureType is the type of a cryptographic signature. * ecdsa: `r (32-bytes) || s (32-bytes)` - `64 bytes` * ecdsa_recovery: `r (32-bytes) || s (32-bytes) || v (1-byte)` - `65 bytes` * ed25519: `R (32-byte) || s (32-bytes)` - `64 bytes` * schnorr_1: `r (32-bytes) || s (32-bytes)` - `64 bytes`  (schnorr signature implemented by Zilliqa where both `r` and `s` are scalars encoded as `32-bytes` values, most significant byte first.) * schnorr_poseidon: `r (32-bytes) || s (32-bytes)` where s = Hash(1st pk || 2nd pk || r) - `64 bytes`  (schnorr signature w/ Poseidon hash function implemented by O(1) Labs where both `r` and `s` are scalars encoded as `32-bytes` values, least significant byte first. https://github.com/CodaProtocol/signer-reference/blob/master/schnorr.ml )",
+       "description":"SignatureType is the type of a cryptographic signature. * ecdsa: `r (32-bytes) || s (32-bytes)` - `64 bytes` * ecdsa_recovery: `r (32-bytes) || s (32-bytes) || v (1-byte)` - `65 bytes` * ed25519: `R (32-byte) || s (32-bytes)` - `64 bytes` * schnorr_1: `r (32-bytes) || s (32-bytes)` - `64 bytes`  (schnorr signature implemented by Zilliqa where both `r` and `s` are scalars encoded as `32-bytes` values, most significant byte first.) * schnorr_bip340: `r (32-bytes) || s (32-bytes)` - `64 bytes`  (sig = (bytes(R) || bytes((k + ed) mod n) where `r` is the `X` coordinate of a point `R` whose `Y` coordinate is even, most significant bytes first.) * schnorr_poseidon: `r (32-bytes) || s (32-bytes)` where s = Hash(1st pk || 2nd pk || r) - `64 bytes`  (schnorr signature w/ Poseidon hash function implemented by O(1) Labs where both `r` and `s` are scalars encoded as `32-bytes` values, least significant byte first. https://github.com/CodaProtocol/signer-reference/blob/master/schnorr.ml )",
        "type":"string",
        "enum": [
          "ecdsa",
          "ecdsa_recovery",
          "ed25519",
          "schnorr_1",
+         "schnorr_bip340",
          "schnorr_poseidon"
         ]
       },
diff --git a/models/CurveType.yaml b/models/CurveType.yaml
index 0900a26..6e88130 100644
--- a/models/CurveType.yaml
+++ b/models/CurveType.yaml
@@ -16,6 +16,7 @@ description: |
   CurveType is the type of cryptographic curve associated with a PublicKey.
 
   * secp256k1: SEC compressed - `33 bytes` (https://secg.org/sec1-v2.pdf#subsubsection.2.3.3)
+  * secp256k1_bip340: x-only - `32 bytes`  (implicitly even `Y` coord. Secp256k1 compressed keys may be repurposed by dropping the first byte. (https://github.com/bitcoin/bips/blob/master/bip-0340.mediawiki#Public_Key_Generation))
   * secp256r1: SEC compressed - `33 bytes` (https://secg.org/sec1-v2.pdf#subsubsection.2.3.3)
   * edwards25519: `y (255-bits) || x-sign-bit (1-bit)` - `32 bytes` (https://ed25519.cr.yp.to/ed25519-20110926.pdf)
   * tweedle: 1st pk : Fq.t (32 bytes) || 2nd pk : Fq.t (32 bytes) (https://github.com/CodaProtocol/coda/blob/develop/rfcs/0038-rosetta-construction-api.md#marshal-keys)
@@ -24,6 +25,7 @@ description: |
 type: string
 enum:
   - secp256k1
+  - secp256k1_bip340
   - secp256r1
   - edwards25519
   - tweedle
diff --git a/models/SignatureType.yaml b/models/SignatureType.yaml
index a983b0a..058bad4 100644
--- a/models/SignatureType.yaml
+++ b/models/SignatureType.yaml
@@ -19,6 +19,7 @@ description: |
   * ecdsa_recovery: `r (32-bytes) || s (32-bytes) || v (1-byte)` - `65 bytes`
   * ed25519: `R (32-byte) || s (32-bytes)` - `64 bytes`
   * schnorr_1: `r (32-bytes) || s (32-bytes)` - `64 bytes`  (schnorr signature implemented by Zilliqa where both `r` and `s` are scalars encoded as `32-bytes` values, most significant byte first.)
+  * schnorr_bip340: `r (32-bytes) || s (32-bytes)` - `64 bytes`  (sig = (bytes(R) || bytes((k + ed) mod n) where `r` is the `X` coordinate of a point `R` whose `Y` coordinate is even, most significant bytes first.)
   * schnorr_poseidon: `r (32-bytes) || s (32-bytes)` where s = Hash(1st pk || 2nd pk || r) - `64 bytes`  (schnorr signature w/ Poseidon hash function implemented by O(1) Labs where both `r` and `s` are scalars encoded as `32-bytes` values, least significant byte first. https://github.com/CodaProtocol/signer-reference/blob/master/schnorr.ml )
 type: string
 enum:
@@ -26,4 +27,5 @@ enum:
   - ecdsa_recovery
   - ed25519
   - schnorr_1
+  - schnorr_bip340
   - schnorr_poseidon