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bitcoin.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Bitcoin Paper Wallet Generator</title>
<meta name="description" content="A lightweight, client-side, reliable, fast, open-source universal paper wallet generator supporting almost every major cryptocurrency">
<meta name="keywords" content="minimal, reliable, fast, universal, paper, wallet, generator, offline, bitcoin, btc, cryptocurrency">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="css/style2.css">
</head>
<body >
<div id="container">
<br>
<div class="noprint">
<button onclick="generate()">Generate</button>
<button onclick="window.print()">Print</button>
<a href="index.html">
<input type="button" value="Home"/>
</a>
<!---->
<br>
<div>
<label>My Public/Private address need include(The longer the custom string, the longer the generation time):</label>
<br>
<input id="SpecifyKeyword" type="" name="" placeholder="66">
<br><br>
<button onclick="generate(true);">Generate custom public address</button>
<button onclick="generate(false);">Generate custom private address</button>
</div>
<!---->
</div>
<table>
<tr>
<h1 id="titlePaper">Bitcoin Paper Wallet</h1>
</tr>
<tr>
<th class="grayHeaders">Public Address
<span id="shareColor">(SHARE)</span>
</th>
</tr>
<tr>
<td>
<div id="public"> </div>
</td>
</tr>
<tr>
<td>
<div id="public_qr"></div>
</td>
</tr>
<tr>
<th class="grayHeaders">
<div id="secretLabel">Private Key
<span id="secretColor">(SECRET)</span>
</div>
</th>
</tr>
<tr>
<td>
<div id="secret"> </div>
</td>
</tr>
<tr>
<td>
<div id="secret_qr"></div>
</td>
</tr>
<tr>
</table>
<script src="js/bitcoinjs-lib.js"></script>
<script src="js/qrcode.js"></script>
<script>
async function generate(isPublic) {
console.log("isPublic",isPublic );
document.getElementById("public").textContent = "";
document.getElementById("secret").textContent = "";
document.getElementById("public_qr").textContent = "";
document.getElementById("secret_qr").textContent = "";
const timer = ms => new Promise(res => setTimeout(res, ms))
// then the created Promise can be awaited
document.getElementById("public").textContent = "Generating...";
/////////////////////////////////////
var keyPair ;
var pubKey ;
var privKey ;
var CustomString=document.getElementById('SpecifyKeyword').value;
console.log("CustomString",CustomString );
console.log("CustomString.length",CustomString.length);
do {
var step;
await timer(1);
keyPair = bitcoin.ECPair.makeRandom();
pubKey = keyPair.getAddress();
privKey = keyPair.toWIF();
var LastString ;
if (isPublic) {
LastString= pubKey.substr(pubKey.length - CustomString.length);
}else{
LastString= privKey.substr(privKey.length - CustomString.length);
}
console.log('LastString:',LastString);
document.getElementById("public").textContent = pubKey;
document.getElementById("secret").textContent = privKey;
// if (pubKey.includes("888")) {
// break;
// }
} while (!LastString.includes(CustomString));
//}
console.log('******pubKey:',pubKey);
/////////////////////////////////////
document.getElementById("public").textContent = pubKey;
document.getElementById("secret").textContent = privKey;
document.getElementById("public_qr").textContent = "";
document.getElementById("secret_qr").textContent = "";
new QRCode(document.getElementById("public_qr"), {text: pubKey, width: 128, height: 128, correctLevel : QRCode.CorrectLevel.H});
new QRCode(document.getElementById("secret_qr"), {text: privKey, width: 128, height: 128, correctLevel : QRCode.CorrectLevel.H});}
</script>
</body>
</html>