如何构建未签名的psbt

有没哪位大神用java实现过构建taproot的未签名psbt？能否提供一份demo给我参考一下，万分感谢

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1 个回答

Wade - Footprint Analytics CTO 2024-09-04 16:13

　擅长：数据分析,GameFi,NFT

添加BitcoinJ依赖：
```js
<dependency>
    <groupId>org.bitcoinj</groupId>
    <artifactId>bitcoinj-core</artifactId>
    <version>0.15.10</version>
</dependency>
```
构建未签名PSBT

```js
import org.bitcoinj.core.*;
import org.bitcoinj.crypto.TransactionSignature;
import org.bitcoinj.params.TestNet3Params;
import org.bitcoinj.script.Script;
import org.bitcoinj.wallet.Wallet;
import org.bitcoinj.wallet.WalletTransaction;

import java.util.ArrayList;
import java.util.List;

public class TaprootPSBT {

public static void main(String[] args) {
        NetworkParameters params = TestNet3Params.get();

// 创建一个新的交易
        Transaction tx = new Transaction(params);

// 添加输入
        String inputTxId = "your-input-transaction-id";
        int inputIndex = 0;
        Coin inputAmount = Coin.valueOf(100000); // 输入金额
        TransactionOutPoint outPoint = new TransactionOutPoint(params, inputIndex, Sha256Hash.wrap(inputTxId));
        tx.addInput(outPoint, ScriptBuilder.createTaprootOutputScript(new ECKey())); // 使用Taproot脚本

// 添加输出
        String outputAddress = "your-output-address";
        Coin outputAmount = Coin.valueOf(90000); // 输出金额
        Address address = Address.fromString(params, outputAddress);
        tx.addOutput(outputAmount, address);

// 创建PSBT
        PSBT psbt = new PSBT(tx);

// 添加输入的相关信息
        PSBTInput psbtInput = psbt.getInput(0);
        psbtInput.setWitnessUtxo(new TransactionOutput(params, null, inputAmount, ScriptBuilder.createTaprootOutputScript(new ECKey())));

// 打印PSBT
        System.out.println(psbt.toBase64());
    }
}

```

- [BitcoinJ Documentation](https://bitcoinj.github.io/)
 **BitcoinJ入门教程**：
   - [Getting Started with BitcoinJ](https://bitcoinj.github.io/getting-started)