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September 23, 2021 21:50
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create and broadcast op_return data to bitcoin blockchain by using polar and bitcoinjs.
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| var bitcoin = require('bitcoinjs-lib'); | |
| const Client = require('bitcoin-core'); | |
| const client = new Client({ network: 'regtest',port: 18443, username: 'polaruser', password: 'polarpass', version: '0.21.1' }); | |
| async function sendopreturn() { | |
| try { | |
| const unspentutxos = await client.command('listunspent'); | |
| // console.log("unspentutxos: ", unspentutxos); | |
| // get a random UTXO | |
| const randomutxo = unspentutxos[Math.floor(Math.random()*unspentutxos.length)]; | |
| console.log(`randomutxo: `, JSON.stringify(randomutxo)); | |
| // get privkey for the utxo | |
| const wif = await client.command(`dumpprivkey`, randomutxo.address); | |
| // console.log("privkey for the utxo: ", wif); | |
| // use bitcoinjs-lib psbt to get raw op_return tx | |
| const alice = bitcoin.ECPair.fromWIF(wif, bitcoin.networks.regtest); | |
| const inputData1 = { | |
| hash: randomutxo.txid, | |
| index: randomutxo.vout, | |
| witnessUtxo: {script: Buffer.from(randomutxo.scriptPubKey, 'hex'), value: parseInt(randomutxo.amount*100000000)} | |
| }; | |
| // this is opreturn data - can be anything under 80 bytes | |
| const data = Buffer.from('03729d8e7a3bfcffc65b4f97df0bdbb128339a7110a1c1b33d8462d1355fc7ba', 'hex'); | |
| const embed = bitcoin.payments.embed({ data: [data] }); | |
| const psbt = new bitcoin.Psbt({ network: bitcoin.networks.regtest }) | |
| .addInput(inputData1) | |
| .addOutput({ | |
| script: embed.output, | |
| value: 0, | |
| }) | |
| .addOutput({ | |
| address: 'bcrt1q7xp6jcgmnuvvaqzr9sdg7yjdqfftswjdqz9897', | |
| value: 500000, | |
| }) | |
| .addOutput({ | |
| address: randomutxo.address, | |
| value: parseInt(randomutxo.amount*100000000)-501000, | |
| }) | |
| .signInput(0, alice); | |
| psbt.finalizeAllInputs(); | |
| const txHex = psbt.extractTransaction().toHex(); | |
| console.log(`txHex ${txHex}`); | |
| await client.command(`sendrawtransaction`, txHex); | |
| console.log("raw tx sent: ", txHex); | |
| } catch (error) { | |
| console.log("error: ", error); | |
| } | |
| } | |
| sendopreturn(); |
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