Thanks yest did this -- now trying to confirme actual equivalence of addresses.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>BTC Address Equivalence Checker</title>
<style>
body { font-family: system-ui, sans-serif; max-width: 600px; margin: 2rem auto; }
input, button { width: 100%; padding: .5rem; margin-top: .5rem; font-size: 1rem; }
pre { background:#f6f6f6; padding:1rem; border-radius:8px; }
.ok { color:green; }
.no { color:red; }
</style>
</head>
<body>
<h2>Bitcoin Mainnet ↔ Testnet Address Checker</h2>
<label>Mainnet or Testnet Address A:</label>
<input id="addrA" placeholder="bc1... or 1... or m...">
<label>Address B:</label>
<input id="addrB" placeholder="tb1... or m... or 1...">
<button id="btn">Compare</button>
<pre id="out"></pre>
<script type="module">
import { bech32 } from '
https://cdn.jsdelivr.net/npm/@scure/base@1.1.5/+esm';import bs58check from '
https://cdn.jsdelivr.net/npm/bs58check@2.1.2/+esm';function decodeAddress(addr) {
addr = addr.trim();
if (addr.toLowerCase().startsWith('bc1') || addr.toLowerCase().startsWith('tb1')) {
const { prefix, words } = bech32.decode(addr);
const version = words[0];
const program = bech32.fromWords(words.slice(1));
return { type: 'bech32', hrp: prefix, version, payload: bytesToHex(program) };
} else {
const buf = bs58check.decode(addr);
const version = buf[0];
const payload = buf.slice(1);
return { type: 'base58', version, payload: bytesToHex(payload) };
}
}
function bytesToHex(b){return Array.from(b, x=>x.toString(16).padStart(2,'0')).join('');}
function compare(a,b){
try {
const A = decodeAddress(a), B = decodeAddress(b);
const eq = A.payload === B.payload && A.type === B.type;
return {A,B,equivalent:eq};
} catch(e){ return {error:e.message}; }
}
document.getElementById('btn').onclick = () => {
const a = document.getElementById('addrA').value;
const b = document.getElementById('addrB').value;
const r = compare(a,b);
const out = document.getElementById('out');
if (r.error) { out.innerHTML = `<span class=no>Error:</span> ${r.error}`; return; }
out.innerHTML = `
A → ${JSON.stringify(r.A, null, 2)}
\nB → ${JSON.stringify(r.B, null, 2)}
\nResult: <strong class="${r.equivalent?'ok':'no'}">
${r.equivalent ? 'Equivalent ✅' : 'Different ❌'}
</strong>`;
};
</script>
</body>
</html>
