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supertestnet/gist:8df4b12812dd5a66ce965e0ae2f2d550

Last active January 10, 2024 15:57
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How to do arbitrary data script with p2tr
Raw
gistfile1.txt
https://mutinynet.com/tx/5e2be1456d1917338729449e60913781fe12b008b5b32cd76eacb953f66bd636
```html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, user-scalable=no">
<script src="https://cdn.jsdelivr.net/gh/6502/sha256@main/sha256.js"></script>
<script src="https://unpkg.com/@cmdcode/tapscript@1.4.0"></script>
<script src="https://bundle.run/noble-secp256k1@1.2.14"></script>
<style>
* {
box-sizing: border-box;
font-size: 1.15rem;
font-family: Arial, sans-serif;
}
html {
max-width: 800px;
padding: 3rem 1rem;
margin: auto;
line-height: 1.25;
padding: 0;
}
body {
margin: 0;
}
h1 {
font-size: 2rem;
}
h2 {
font-size: 1.5rem;
}
input {
line-height: 1.25;
width: 100%;
height: 1.8rem;
font-size: 1.15rem;
border: 1px solid grey;
}
.texto {
margin-top: 10rem;
word-wrap: break-word;
margin: 3rem;
}
@media screen and (max-width: 600px) {
}
</style>
<script>
var $ = document.querySelector.bind( document );
var $$ = document.querySelectorAll.bind( document );
var url_params = new URLSearchParams( window.location.search );
var url_keys = url_params.keys();
var $_GET = {}
for ( var key of url_keys ) $_GET[ key ] = url_params.get( key );
</script>
<script>
var SHA256 = string_or_uint8array => bytesToHex( sha256( string_or_uint8array ) );
var bytesToHex = bytes => bytes.reduce( ( str, byte ) => str + byte.toString( 16 ).padStart( 2, "0" ), "" );
var hexToBytes = hex => Uint8Array.from( hex.match( /.{1,2}/g ).map( byte => parseInt( byte, 16 ) ) );
var runscript = async () => {
var privkey = bytesToHex( nobleSecp256k1.utils.randomPrivateKey() );
var pubkey = nobleSecp256k1.getPublicKey( privkey, true ).substring( 2 );
var keyhash = SHA256( hexToBytes( pubkey ) );
var script = [ "this is some arbitrary data", 'OP_VERIFY', 'OP_DUP', 'OP_SHA256', keyhash, 'OP_EQUALVERIFY', 'OP_CHECKSIG' ];
var tapleaf = tapscript.Tap.encodeScript(script);
var [ tpubkey, cblock ] = tapscript.Tap.getPubKey(pubkey, { target: tapleaf })
var address = tapscript.Address.p2tr.fromPubKey(tpubkey, 'testnet');
console.log( "deposit at least 10k sats to this address:" );
console.log( address );
var txid = prompt( `deposit at least 10k sats to this address (which is also in your console):\n\n${address}\n\nthen enter the txid of your deposit` );
var vout = prompt( "and the vout" );
vout = Number( vout );
var amt = prompt( "and the amount in sats" );
amt = Number( amt );
var txdata = tapscript.Tx.create({
vin: [{
txid: txid,
vout: vout,
prevout: {
value: amt,
scriptPubKey: tapscript.Address.toScriptPubKey( address ),
},
}],
vout: [{
value: amt - 500,
scriptPubKey: tapscript.Address.toScriptPubKey( 'bcrt1q6zpf4gefu4ckuud3pjch563nm7x27u4ruahz3y' ),
}],
});
var sig = tapscript.Signer.taproot.sign( privkey, txdata, 0, { extension: tapleaf }).hex;
txdata.vin[ 0 ].witness = [ sig, pubkey, script, cblock ];
var isValid = await tapscript.Signer.taproot.verify( txdata, 0, { pubkey });
console.log( "sig is valid, right?", isValid );
var txhex = tapscript.Tx.encode( txdata ).hex;
var div = document.createElement( "div" );
div.innerHTML = `broadcast this tx:<br>${txhex}`;
$( '.texto' ).append( div );
}
</script>
</head>
<body>
<div class="texto"></div>
<script>
runscript();
</script>
</body>
</html>
```
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