由于已经不从事区块链相关项目，对疑惑的小伙伴提供一些帮助~~
对于离线交易不做过多解释~，说白了就是拿上一笔未发出交易记录进行私钥的签名然后广播到链上。
主要是对区块链离线交易进行utxo上链。
废话不多说 ，直接上代码：
UnspentUtxo交易查询参考：https://blog.csdn.net/u011663149/article/details/91855077
离线签名(非隔离见证地址):
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<UnSpentUtxo> unUtxos) {
if(!unUtxos.isEmpty() && null != unUtxos){
List<UTXO> utxos = new ArrayList<UTXO>();
// 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<UnSpentUtxo> us = new ArrayList<UnSpentUtxo>();
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);
}
}
image.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;
}
}
image.gif
签名成功返回Hex，使用https://live.blockcypher.com/btc-testnet/decodetx/ 进行解码查看交易详情：
image
image.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。
