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sampleCall.html
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<!DOCTYPE html>
<html dir="ltr" lang="en-US">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<meta name="description" content="btc relay, ethereum, bitcoin, bitcoin relay, smart contracts, sidechain, peg" />
<link rel="apple-touch-icon" sizes="57x57" href="images/favicons/apple-icon-57x57.png">
<link rel="apple-touch-icon" sizes="60x60" href="images/favicons/apple-icon-60x60.png">
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<link rel="icon" type="image/png" sizes="16x16" href="images/favicons/favicon-16x16.png">
<link rel="manifest" href="images/favicons/manifest.json">
<meta name="msapplication-TileColor" content="#ffffff">
<meta name="msapplication-TileImage" content="images/favicons/ms-icon-144x144.png">
<meta name="theme-color" content="#ffffff">
<link href='https://fonts.googleapis.com/css?family=Lato:400,300,300italic,400italic,700,700italic|Montserrat:400,700' rel='stylesheet' type='text/css'>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>BTC Relay verifyTx eth_call sample</title>
<link rel="stylesheet" href="./css/bootstrap.min.css">
<link rel="stylesheet" href="./css/dapp.css">
<script src="./js/jquery-2.1.3.min.js"></script>
<script src="./js/bootstrap.min.js"></script>
<script src="./js/btcRelayAbi.js"></script>
<script src="./js/bignumber.js"></script>
<script src="./js/web3.min.js"></script>
<script src="./js/bitcoin-proof.js"></script>
<script type="text/javascript">
if (typeof web3 !== 'undefined') {
// Web3 has been injected by the browser (Mist/MetaMask)
web3 = new Web3(web3.currentProvider);
} else {
// fallback - use your fallback strategy (local node / hosted node + in-dapp id mgmt / fail)
web3 = new Web3(new Web3.providers.HttpProvider("https://mainnet.infura.io:8545"));
}
var btcproof = require('bitcoin-proof');
// var gRelayAddr = web3.eth.namereg.addr('btcrelay');
var gRelayAddr = '0x41f274c0023f83391de4e0733c609df5a124c3d4'; // mainnet
var gMerkleProof;
var gBlockHashOfTx;
var gFeeVerifyFinney;
var RelayContractClass = web3.eth.contract(btcRelayAbi); // see ./js/btcRelayAbi.js
var gRelayContract = RelayContractClass.at(gRelayAddr);
// shows how to use web3 to make an eth_call to the relay contract
// verifyTx returns 1 (success) or 0 (verify failed)
function callVerifyTx(txBytes, txIndex, merkleSibling, txBlockHash) {
// gFeeVerifyFinney is transferred! coinbase must have it or verifyTx fails
var feeWei = web3.toWei(gFeeVerifyFinney, 'finney');
var objParam = { from: '0xde0b295669a9fd93d5f28d9ec85e40f4cb697bae', value: feeWei, gas: 3000000 };
var res = gRelayContract.verifyTx.call(txBytes, txIndex, merkleSibling, txBlockHash, objParam);
document.getElementById('result').innerText = res.toString(16);
}
function callContract() {
var txBytes = '0x' + $('#txHexText').val();
// console.log('txBytes: ' + txBytes)
var txBlockHash = '0x' + gBlockHashOfTx;
// web3.js wants 0x prepended
var merkleSibling = gMerkleProof.sibling.map(function(sib) {
return '0x' + sib;
});
callVerifyTx(txBytes, gMerkleProof.txIndex, merkleSibling, txBlockHash);
}
// includes sample of using the bitcoin-proof module
function getTxInfo() {
var txid = $('#transHex').val();
var urlJsonTx = "https://btc.blockr.io/api/v1/tx/raw/" + txid;
$.getJSON(urlJsonTx, function(data) {
$('#txHexText').val(data.data.tx.hex);
var blockNum = data.data.tx.blockhash;
var blockInfoUrl = "http://btc.blockr.io/api/v1/block/raw/"+blockNum;
$.getJSON(blockInfoUrl, function(res) {
gBlockHashOfTx = res.data.hash;
$('#txBlockHash').text(gBlockHashOfTx)
var txIndex;
for (var key in res.data.tx) {
if (res.data.tx[key] == txid) {
txIndex = key;
break;
}
}
gMerkleProof = btcproof.getProof(res.data.tx, txIndex);
console.log('merkle proof: ', gMerkleProof)
$('#mProof').val(JSON.stringify(gMerkleProof));
gFeeVerifyFinney = web3.fromWei(gRelayContract.getFeeAmount.call('0x'+gBlockHashOfTx), 'finney');
$('#feeVerifyTx').text(gFeeVerifyFinney);
})
})
}
$(function() {
// tx[1] of block 408000
$('#transHex').val('dd059634699e85b51af4964ab97d5e75fb7cd86b748d0ee1c537ca1850101dc7');
$('#btn-get-tx').click(getTxInfo);
$('#relayAddr').text(gRelayAddr);
});
</script>
</head>
<body>
<div class="container">
<div class="logo">
<img src="./images/BTCRelayLogo.png"/>
</div>
<p class="lead">BTC Relay at <span id="relayAddr"></span></p>
<p>This is a sample of calling <a href="https://github.com/ethereum/btcrelay/tree/master#verifytxrawtransaction-transactionindex-merklesibling-blockhash">verifyTx</a>
</p>
<h2>1.</h2>
<div class="row">
<form class="form">
<div class="form-group">
<label for="transHex">Bitcoin Transaction Hash</label>
<input type="text" class="form-control" id="transHex" size="64" maxlength="64"></input>
</div>
<button type="button" class="btn btn-default" id="btn-get-tx">Lookup</button>
</form>
</div>
<h2>2.</h2>
<div class="row">
<form>
<div class="form-group">
<label for="txHexText">Raw Transaction</label>
<textarea readonly class="form-control" name="textarea" id="txHexText" rows="6" cols="50"></textarea>
</div>
<div class="form-group">
<label for="mProof">Merkle Proof</label>
<textarea readonly class="form-control" name="textarea" id="mProof" rows="6" cols="50"></textarea>
</div>
<div class="form-group">
<label class="col-md-1 control-label">Block Hash</label>
<p class="form-control-static" id="txBlockHash">0</p>
</div>
<div class="form-group">
<label class="col-md-2 control-label">Verification fee milli-ether</label>
<p class="form-control-static" id="feeVerifyTx">?</p>
</div>
<button type="button" class="btn btn-default" onclick="callContract();">Call verifyTx</button>
</form>
</div>
<div class="row">
<div>BTC Relay verifyTx returned: <span id="result"></span></div>
</div>
<hr>
<div class="row">
<div>View page source to see the main steps:</div>
<ul>
<li>Getting a raw transaction and its index from a hash</li>
<li>Using <a href="https://www.npmjs.com/package/bitcoin-proof">bitcoin-proof </a>to get a Merkle proof</li>
<li>Calling <a href="https://github.com/ethereum/btcrelay#verifytxrawtransaction-transactionindex-merklesibling-blockhash">verifyTx</a></li>
</ul>
</div>
<div class="footer-logo">
<img src="./images/ethereum-logo-small.png"/>
</div>
</div>
</body>
</html>