LTC（莱特币）离线签名
大家好，我是小a，不太经常写博客，比较菜，之前没做过utxo模型，这几天在疯狂弥补自己的不足-。-研究还不够深入，如有不正确地方还望指出，以后写博客我也尽量回去用英文，或者自己进行google翻译，现在越来越觉得英文很重要，认知到自己很多不足，希望大家可以一起学习英语，如果实在不行就边google边看意思，以及语法。
About LTC offline signature
In fact, ltc belongs to the btc series. It is not difficult to find the source code. (In fact, the source code is the same -_-||, 1co’s altcoin), except that the network is different from the addressHeader, basically the same.。
The following explains the address generation of ltc
The generated address is actually the same as btc, it is a network, it is very simple .
// create address
//todo Here LitecoinNetParameters has a link in github as
[Ltc, doge's network description](https://github.com/dogecoin/libdohj/tree/master/core/src/main/java/org/libdohj/params)
LitecoinNetParameters networkParameters = LitecoinNetParameters.get();
ECKey ecKey = new ECKey();
LegacyAddress address = LegacyAddress.fromKey(networkParameters, ecKey);
String privateKey = ecKey.getPrivateKeyEncoded(networkParameters).toString();
System.out.println("address ：" + address1.toBase58());
System.out.println("privateKey ：" + privateKey);
Here I started to explain the offline signature. There is nothing different from btc. In addition to changing a network, I can’t think of it. It’s just a change. .
// sign transaction
/**
* ltc offline sign
* @param changeAddress //todo The change address can be entered. Here I pass the change as a parameter, and the exchange and wallet are not recommended.
* @param toAddressList //todo The roll-out address is a collection, you can also change to a single
* @param outAmount //todo Transfer out the amount, here is not made a list, you want to utxo one-to-one correspondence can be their own transformation
* @param fee //todo fee
* @param inputUtxos //todo Mainly business parameters, you can package according to your business.
* @return Signed rawHex parameter,Can be used for broadcasting
* @throws Exception
*/
public String ltcSign(String changeAddress, List<String> toAddressList, long outAmount, long fee, List<BtcUtxo> inputUtxos) {
if (null == changeAddress) {
return "changeAddress is null";
}
if (CollectionUtils.isEmpty(inputUtxos)) {
return "utxos is null";
}
LitecoinNetParameters networkParameters = LitecoinNetParameters.get();
Transaction transaction = new Transaction(networkParameters);
if (toAddressList.size() > 0) { //todo Multiple receiving addresses
for (int i = 0; i <toAddressList.size() ; i++) {
transaction.addOutput(Coin.valueOf(outAmount), LegacyAddress.fromBase58(networkParameters, toAddressList.get(i)));
}
}
//todo Change address output (input total amount - total transfer amount - handling fee)
long inputTotalAmount = inputUtxos.stream().mapToLong(BtcUtxo::getValue).sum();
//todo Amount * toAddressList.size() is written because the amount has not been split into multiples. The amount of the transfer must be one-to-one with the address. Temporary use of a fixed amount * Total number of utxo
long changeAmount = inputTotalAmount - outAmount * toAddressList.size() -fee;
//todo If the change is greater than 0, it will be transferred to the change address. This has been changed to a parameter and can be changed to zero. For security advice, write a fixed address here. Avoid misuse.
if (changeAmount > 0) {
transaction.addOutput(Coin.valueOf(changeAmount), LegacyAddress.fromBase58(networkParameters, changeAddress));
}
for (BtcUtxo inputUtxo : inputUtxos) {
UTXO utxo = new UTXO(
Sha256Hash.wrap(inputUtxo.getTxid()),
Long.valueOf(inputUtxo.getOutputN()),
Coin.valueOf(inputUtxo.getValue()),
0,
false,
new Script(Hex.decode(inputUtxo.getScript())));
TransactionOutPoint outPoint = new TransactionOutPoint(networkParameters, utxo.getIndex(), utxo.getHash());
transaction.addSignedInput(
outPoint,
utxo.getScript(),
DumpedPrivateKey.fromBase58(networkParameters,inputUtxo.getPrivateKey()).getKey(),
Transaction.SigHash.ALL,
true);
}
String rawHex = Hex.toHexString(transaction.bitcoinSerialize());
log.info("fee:{},utxoAmount:{},changeAmount{}", fee, outAmount * toAddressList.size(), changeAmount);
return rawHex;
}
public static void main(String[] args) throws Exception {
LtcClient ltcClient = new LtcClient();
List<BtcUtxo> utxos = Lists.newArrayList();
BtcUtxo btcUtxo1 = new BtcUtxo()
.setTxid("d49eaa1b9a41bc713a08475e4c5c1af4e2c66e2860803a592d70dbc76182bbac")
.setOutputN("2")
.setValue(1810000)
.setScript("76a9149a32e6692d659e41a135d9e6fe0e3f591574e6cb88ac")
.setPrivateKey("your privateKey");
utxos.add(btcUtxo1); //todo success
BtcUtxo btcUtxo2 = new BtcUtxo()
.setTxid("d49eaa1b9a41bc713a08475e4c5c1af4e2c66e2860803a592d70dbc76182bbac")
.setOutputN("0")
.setValue(100000)
.setScript("76a914d0a9fb2847920a5a9abf3b1a32ee3c7bf1b00f9b88ac")
.setPrivateKey("your privateKey");
utxos.add(btcUtxo2); //todo success
String pk1 = "your privateKey";//todo LQT3XfhBHc5qjj2EnpaBd3tAp4JCa3JPvT
String pk2 = "your privateKey";//todo LZHHJMMrScT7ZQU45BNzvoZ5PMagWdbUS8
String pk3 = "your privateKey";//todo LZibmf4x2cUZinLUwAmtcbAZR1JGSjaXuk
String pk4 = "your privateKey";//todo LeFGSc8QC2aZacDBEkECookyKjBr76Lkz6
String testaddr = "your privateKey";//todo LNTV6tGkpoLmdd4D8M8CaMapnRysfsQGbX
//todo Transfer multiple addresses (same amount)
List<String> toAddressList = new ArrayList<>();
toAddressList.add("LZibmf4x2cUZinLUwAmtcbAZR1JGSjaXuk");
toAddressList.add("LQT3XfhBHc5qjj2EnpaBd3tAp4JCa3JPvT");
String rawHex = ltcClient.ltcSign("LNTV6tGkpoLmdd4D8M8CaMapnRysfsQGbX",toAddressList, 954000, 1000, utxos);
//todo raw hex is sign result, you push need this.
System.out.println(rawHex);
//todo push,Signature result submission broadcast，if return txid,You need to confirm if the block is greater than 0 or 6 to think that he is successful.
ltcClient.push(rawHex);
This is my many-to-many link to success.
Need to discuss can contact me， QQ 936710254 or WeChat: wr199611