From 9b8940dbbb24ad9efee32b6607cbd08b53c871b9 Mon Sep 17 00:00:00 2001
From: deanmlittle <10921578+deanmlittle@users.noreply.github.com>
Date: Mon, 2 Sep 2019 16:01:32 +0800
Subject: [PATCH 1/3] Update index.js

Added optional change address to promote single use addresses
---
 index.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/index.js b/index.js
index 8e76ec5..aa57984 100644
--- a/index.js
+++ b/index.js
@@ -62,8 +62,10 @@ var build = function(options, callback) {
           tx.to(receiver.address, receiver.value)
         })
       }
-
-      tx.fee(defaults.fee).change(address);
+      
+      //Pay remaining outputs to next address if defined, or default back to sender's address
+      const change = options.change ? new bitcoin.Address.fromString(options.change) : address;
+      tx.fee(defaults.fee).change(change);
       let opt_pay = options.pay || {};
       let myfee = opt_pay.fee || Math.ceil(tx._estimateSize()* (opt_pay.feeb || defaults.feeb));
       tx.fee(myfee);

From e74acca3a88a73913bfb343db46bb6e60a1ce11d Mon Sep 17 00:00:00 2001
From: deanmlittle <10921578+deanmlittle@users.noreply.github.com>
Date: Mon, 2 Sep 2019 16:02:11 +0800
Subject: [PATCH 2/3] Update package.json

Updated to latest version of BSV
---
 package.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package.json b/package.json
index ba435c8..17a9362 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
     "mingo": "^2.2.4"
   },
   "peerDependencies": {
-    "bsv": "0.27.1"
+    "bsv": "0.30.0"
   },
   "files": [
     "dist"

From 093c47be4f2524460aeb09e1640751f386d050b3 Mon Sep 17 00:00:00 2001
From: deanmlittle <10921578+deanmlittle@users.noreply.github.com>
Date: Mon, 2 Sep 2019 16:22:38 +0800
Subject: [PATCH 3/3] Update README.md

---
 README.md | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 1d3a826..6e23c12 100644
--- a/README.md
+++ b/README.md
@@ -92,7 +92,8 @@ var config = {
       address: "1A2JN4JAUoKCQ5kA4pHhu4qCqma8jZSU81",
       value: 1000
     }]
-  }
+  },
+  change: "1CBtFi158ieej44LJ9XkoGuH99t1BFh15j"
 }
 ```
 
@@ -436,6 +437,32 @@ datapay.build(tx, function(err, tx) {
 })
 ```
 
+
+#### 6. `change`
+
+The `change` attribute is used to optionally specify where change for unspent funds pays out to, making it easy to implement single-use addresses.
+
+- default: sender's address
+
+```
+const tx = {
+  safe: true,
+  data: ["0x6d02", "hello world"],
+  pay: {
+    key: "5JZ4RXH4MoXpaUQMcJHo8DxhZtkf5U5VnYd9zZH8BRKZuAbxZEw",
+  },
+  change: "1CBtFi158ieej44LJ9XkoGuH99t1BFh15j"
+}
+datapay.build(tx, function(err, res) {
+  /**
+  * res contains the generated transaction object
+  * (a signed transaction, since 'key' is included.)
+  * It also pays any unspent change to the address
+  * in the change field instead of returning to sender.
+  **/
+})
+```
+
 ---
 
 ### C. tx