区块链钱包——BTC Java版离线签名交易

由于本人不再从事区块链相关的项目离线签名btc冷钱包，给迷茫的朋友们提供一些帮助~~

线下交易我不想过多解释。 说白了就是拿最后一条未发送的交易记录用私钥签名，然后广播到链上。

主要是对区块链线下交易进行链上utxo。

废话不多说，直接上代码：

UnspentUtxo交易查询参考：

离线签名（非segwit地址）：

import java.util.ArrayList;
import java.util.List;
import org.apache.commons.codec.binary.Hex;
import org.apache.commons.configuration2.Configuration;
import org.bitcoinj.core.Address;
import org.bitcoinj.core.Coin;
import org.bitcoinj.core.Context;
import org.bitcoinj.core.DumpedPrivateKey;
import org.bitcoinj.core.ECKey;
import org.bitcoinj.core.NetworkParameters;
import org.bitcoinj.core.Sha256Hash;
import org.bitcoinj.core.Transaction;
import org.bitcoinj.core.TransactionOutPoint;
import org.bitcoinj.core.UTXO;
import org.bitcoinj.core.Utils;
import org.bitcoinj.params.MainNetParams;
import org.bitcoinj.params.TestNet3Params;
import org.bitcoinj.script.Script;
import org.omg.CORBA.UNKNOWN;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.alibaba.fastjson.JSON;
import com.bscoin.coldwallet.cointype.common.ConfigUtil;
import com.bscoin.coldwallet.cointype.common.UnSpentUtxo;
import org.bitcoinj.core.TransactionConfidence;
/**  
    * @ClassName: RawTransaction  
    * @author DHing  
    *    
*/  
public class RawTransaction {
    private static Logger LOG = LoggerFactory.getLogger(RawTransaction.class);
    static NetworkParameters params;
    static {
        try {
            Configuration config = ConfigUtil.getInstance();
            params = config.getBoolean("bitcoin.testnet") ? TestNet3Params.get() : MainNetParams.get();
            LOG.info("=== [BTC] bitcoin  client networkID：{} ===", params.getId());
        } catch (Exception e) {
            LOG.info("=== [BTC] com.bscoin.coldwallet.cointype.btc.rawtransaction:{} ===", e.getMessage(), e);
        }
    }
        /**  
        * @Title: signTransaction
        * @param @param privKey 私钥
        * @param @param recevieAddr 收款地址
        * @param @param formAddr 发送地址
        * @param @param amount 金额
        * @param @param fee 手续费(自定义 或者 默认)
        * @param @param unUtxos 未交易的utxo
        * @param @return    参数  
        * @return char[]    返回类型  
        * @throws  
        */  
    public static String signTransaction(String privKey, String recevieAddr, String formAddr,
                                                                          long amount, long fee, 
                                                                          List unUtxos) {
        if(!unUtxos.isEmpty() && null != unUtxos){
            List utxos = new ArrayList();
            // String to a private key
            DumpedPrivateKey dumpedPrivateKey = DumpedPrivateKey.fromBase58(params, privKey);
            ECKey key = dumpedPrivateKey.getKey();
            // 接收地址
            Address receiveAddress = Address.fromBase58(params, recevieAddr);
            // 构建交易
            Transaction tx = new Transaction(params);
            tx.addOutput(Coin.valueOf(amount), receiveAddress); // 转出
            // 如果需要找零 消费列表总金额 - 已经转账的金额 - 手续费
            long value = unUtxos.stream().mapToLong(UnSpentUtxo::getValue).sum();
            Address toAddress = Address.fromBase58(params, formAddr);
            long leave  = value - amount - fee;
            if(leave > 0){
                tx.addOutput(Coin.valueOf(leave), toAddress);
            }
            // utxos is an array of inputs from my wallet
            for (UnSpentUtxo unUtxo : unUtxos) {
                utxos.add(new UTXO(Sha256Hash.wrap(unUtxo.getHash()),
                                unUtxo.getTxN(),
                                Coin.valueOf(unUtxo.getValue()), 
                                unUtxo.getHeight(), 
                                false,
                                new Script(Utils.HEX.decode(unUtxo.getScript())),
                                unUtxo.getAddress()));
            }
            for (UTXO utxo : utxos) {
                TransactionOutPoint outPoint = new TransactionOutPoint(params, utxo.getIndex(), utxo.getHash());
                // YOU HAVE TO CHANGE THIS
                tx.addSignedInput(outPoint, utxo.getScript(), key, Transaction.SigHash.ALL, true);
            }
            Context context = new Context(params);
            tx.getConfidence().setSource(TransactionConfidence.Source.NETWORK);
            tx.setPurpose(Transaction.Purpose.USER_PAYMENT);
            LOG.info("=== [BTC] sign success,hash is :{} ===",tx.getHashAsString());
            return new String(Hex.encodeHex(tx.bitcoinSerialize()));
        }
        return null;
    }
    public static void main(String[] args) {
        List us = new ArrayList();
        UnSpentUtxo u = new UnSpentUtxo();
        u.setAddress("mifiHFYFPk5cri4oneXVsRZJZKovvdDcjo");
        u.setHash("2bc6ac92468c2b4f1fcd2349822dc4663dfc0705b30131087a20ed8d17de8274");
        u.setHeight(    1413239);
        u.setScript("76a914a1806613a51a81966779e2fa1537013cf4cd2b1788ac");
        u.setTxN(1);
        u.setValue(100000);
        UnSpentUtxo u1 = new UnSpentUtxo();
        u1.setAddress("mvEtuEqYPMrLaKjJ5nTZ57vQAoYUtVmMaQ");
        u1.setHash("1893b6ff8ef2bd6f5d652937ffbaed5bb669c5d9ab450066253d6692f2d4d972");
        u1.setHeight(1413334);
        u1.setScript("76a914a1806613a51a81966779e2fa1537013cf4cd2b1788ac");
        u1.setTxN(1);
        u1.setValue(400000);
        us.add(u);
        us.add(u1);
        System.out.println(JSON.toJSONString(us));
        String c = signTransaction("cNRE3D1pbPPvGs9wpZd3X9NuLsuUQPzPa7ktQyF1nhqBabraocU9", "mifiHFYFPk5cri4oneXVsRZJZKovvdDcjo", "mvEtuEqYPMrLaKjJ5nTZ57vQAoYUtVmMaQ", 400000, 10000, us);
        System.out.println(c);
    }
}

图片.gif

package com.bscoin.coldwallet.cointype.common;
import java.io.Serializable;
public class UnSpentUtxo implements Serializable {
    private static final long serialVersionUID = -7417428486644921613L;
    private String hash;//交易hash
    private long txN; //
    private long value;//金额
    private int height;//区块高度
    private String script;//hex
    private String address;//钱包地址
    public String getHash() {
        return hash;
    }
    public void setHash(String hash) {
        this.hash = hash;
    }
    public long getTxN() {
        return txN;
    }
    public void setTxN(long txN) {
        this.txN = txN;
    }
    public long getValue() {
        return value;
    }
    public void setValue(long value) {
        this.value = value;
    }
    public int getHeight() {
        return height;
    }
    public void setHeight(int height) {
        this.height = height;
    }
    public String getScript() {
        return script;
    }
    public void setScript(String script) {
        this.script = script;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
}

图片.gif

签名成功返回给Hex离线签名btc冷钱包，用它来解码查看交易详情：

图片

的

图片.gif

最后：

  调用节点钱包api: *sendrawtransaction(hex:object) *传入生成的Hex即可进行广播交易了。