From 72ee6b17d055ef929f0ac8e261f02bc03ac8001b Mon Sep 17 00:00:00 2001
From: OutCast3k <OutCast3k@gmail.com>
Date: Mon, 29 Dec 2014 22:55:28 +0000
Subject: [PATCH] custom data can now be added to the block chain using
 OP_RETURN when building a transaction

---
 index.html    | 10 +++++++-
 js/coin.js    | 16 +++++++++++++
 js/coinbin.js | 64 ++++++++++++++++++++++++++++++++++++++-------------
 3 files changed, 73 insertions(+), 17 deletions(-)

diff --git a/index.html b/index.html
index fb785bb..61aa67a 100644
--- a/index.html
+++ b/index.html
@@ -283,7 +283,7 @@
 
 					<div class="tab-pane tab-content" id="newTransaction">
 						<h2>Transaction <small>Create a new transaction</small></h2>
-						<p>Use this page to create to create a raw transaction</p>
+						<p>Use this page to create a raw transaction</p>
 
 						<b>Address, WIF key or Multisig Redeem Script</b>:
 						<div class="input-group">
@@ -311,6 +311,14 @@
 
 								<hr>
 
+								<label>Null Data</label> <span class="text-muted text-normal">(40 byte limit)</span>
+								<p class="checkbox">
+									<label><input type="checkbox" id="opReturn" class="checkbox-inline"> Allow data to be sent within the transaction and stored in the blockchain by using <a href="https://bitcoin.org/en/developer-guide#null-data" target="_"blank">OP_RETURN</a>.</label>
+									<div class="text-muted">When using this option you may enter a hex string or address into the address field on the output tab.</div>
+								</p>
+
+								<hr>
+
 								<label>Lock Time</label>
 								<p>The <a href="https://bitcoin.org/en/developer-guide#locktime-and-sequence-number">locktime</a> indicates the earliest time a transaction can be added to the block chain.</p>
 								<input type="text" class="form-control" value="0" id="nLockTime">
diff --git a/js/coin.js b/js/coin.js
index a1a2c1a..a303f31 100644
--- a/js/coin.js
+++ b/js/coin.js
@@ -383,9 +383,25 @@
 			o.value = new BigInteger('' + Math.round((value*1) * 1e8), 10);
 			var s = coinjs.script();
 			o.script = s.spendToScript(address);
+
 			return this.outs.push(o);
 		}
 
+		/* add data to a transaction */
+		r.adddata = function(data){
+			var r = false;
+			if(((data.match(/^[a-f0-9]+$/gi)) && data.length<80) && (data.length%2)==0) {
+				var s = coinjs.script();
+				s.writeOp(106); // OP_RETURN
+				s.writeBytes(Crypto.util.hexToBytes(data));
+				o = {};
+				o.value = 0;
+				o.script = s;
+				return this.outs.push(o);
+			}
+			return r;
+		}
+
 		/* list unspent transactions */
 		r.listUnspent = function(address, callback) {
 			coinjs.ajax(coinjs.host+'?uid='+coinjs.uid+'&key='+coinjs.key+'&setmodule=addresses&request=unspent&address='+address+'&r='+Math.random(), callback, "GET");
diff --git a/js/coinbin.js b/js/coinbin.js
index 6016fa3..a411b67 100644
--- a/js/coinbin.js
+++ b/js/coinbin.js
@@ -361,9 +361,16 @@ $(document).ready(function() {
 			}
 		});
 
+		$("#recipients .row").removeClass('has-error');
+
 		$.each($("#recipients .row"), function(i,o){
-			if($(".address",o).val()!="" && $(".amount",o).val()!=""){
-				tx.addoutput($(".address",o).val(), $(".amount",o).val());
+			var a = ($(".address",o).val()).substr(0,80);
+			if(((a!="") && coinjs.addressDecode(a)) && $(".amount",o).val()!=""){ // address
+				tx.addoutput(a, $(".amount",o).val());
+			} else if (((($("#opReturn").is(":checked")) && a.match(/^[a-f0-9]+$/ig)) && a.length<80) && (a.length%2)==0) { // data
+				tx.adddata(a);
+			} else { // neither address nor data
+				$(o).addClass('has-error');
 			}
 		});
 
@@ -589,26 +596,44 @@ $(document).ready(function() {
 				h += '</td>';
 				h += '</tr>';
 			});
+
 			$(h).appendTo("#verifyTransactionData .ins tbody");
 
 			h = '';
 			$.each(decode.outs, function(i,o){
 
-				var addr = '';
-				if(o.script.chunks.length==5){
-					addr = coinjs.scripthash2address(Crypto.util.bytesToHex(o.script.chunks[2]));
-				} else {
-					var pub = coinjs.pub;
-					coinjs.pub = coinjs.multisig;
-					addr = coinjs.scripthash2address(Crypto.util.bytesToHex(o.script.chunks[1]));
-					coinjs.pub = pub;
-				}
+				if(o.script.chunks.length==2 && o.script.chunks[0]==106){ // OP_RETURN
 
-				h += '<tr>';
-				h += '<td><input class="form-control" type="text" value="'+addr+'" readonly></td>';
-				h += '<td class="col-xs-1">'+(o.value/100000000).toFixed(8)+'</td>';
-				h += '<td class="col-xs-2"><input class="form-control" type="text" value="'+Crypto.util.bytesToHex(o.script.buffer)+'" readonly></td>';
-				h += '</tr>';
+					var data = Crypto.util.bytesToHex(o.script.chunks[1]);
+					var dataascii = hex2ascii(data);
+
+					if(dataascii.match(/^[\s\d\w]+$/ig)){
+						data = dataascii;
+					}
+
+					h += '<tr>';
+					h += '<td><input type="text" class="form-control" value="(OP_RETURN) '+data+'" readonly></td>';
+					h += '<td class="col-xs-1">'+(o.value/100000000).toFixed(8)+'</td>';
+					h += '<td class="col-xs-2"><input class="form-control" type="text" value="'+Crypto.util.bytesToHex(o.script.buffer)+'" readonly></td>';
+					h += '</tr>';
+				} else {
+
+					var addr = '';
+					if(o.script.chunks.length==5){
+						addr = coinjs.scripthash2address(Crypto.util.bytesToHex(o.script.chunks[2]));
+					} else {
+						var pub = coinjs.pub;
+						coinjs.pub = coinjs.multisig;
+						addr = coinjs.scripthash2address(Crypto.util.bytesToHex(o.script.chunks[1]));
+						coinjs.pub = pub;
+					}
+
+					h += '<tr>';
+					h += '<td><input class="form-control" type="text" value="'+addr+'" readonly></td>';
+					h += '<td class="col-xs-1">'+(o.value/100000000).toFixed(8)+'</td>';
+					h += '<td class="col-xs-2"><input class="form-control" type="text" value="'+Crypto.util.bytesToHex(o.script.buffer)+'" readonly></td>';
+					h += '</tr>';
+				}
 			});
 			$(h).appendTo("#verifyTransactionData .outs tbody");
 
@@ -618,6 +643,13 @@ $(document).ready(function() {
 		}
 	}
 
+	function hex2ascii(hex) {
+		var str = '';
+		for (var i = 0; i < hex.length; i += 2)
+			str += String.fromCharCode(parseInt(hex.substr(i, 2), 16));
+		return str;
+	}
+
 	function decodePrivKey(){
 		var wif = $("#verifyScript").val();
 		if(wif.length==51 || wif.length==52){