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Java版本离线签名怎么实现

发表于：2025-12-03 作者：千家信息网编辑

千家信息网最后更新 2025年12月03日，本篇内容介绍了"Java版本离线签名怎么实现"的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！Build

千家信息网最后更新 2025年12月03日Java版本离线签名怎么实现

本篇内容介绍了"Java版本离线签名怎么实现"的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！

Build jar

first get source code

git clone https://github.com/successli/tx_signer.git

get jar package
```
$ mvn assembly:assembly -Dmaven.test.skip=true
```
You can get a jar with dependencies, and you can use it in your project.

Test cases

Need 3 Parameters:

Private Keys Array
Template Object
After call build transaction api return a Template json object. build transaction api
use bytom java sdk return a Template object.
Raw Transaction
call decode raw-transaction api from dev branch. decode raw-transaction api

Call method:

// return a Template object signed offline basically.Template result = signatures.generateSignatures(privates, template, rawTransaction);// use result's raw_transaction call sign transaction api to build another data but not need password or private key.

Single-key Example:

@Test// 使用 SDK 来构造 Template 对象参数, 单签public void testSignSingleKey() throws BytomException {    Client client = Client.generateClient();    String asset_id = "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff";    String address = "sm1qvyus3s5d7jv782syuqe3qrh75fx23lgpzf33em";    // build transaction obtain a Template object    Template template = new Transaction.Builder()        .addAction(        new Transaction.Action.SpendFromAccount()        .setAccountId("0G0NLBNU00A02")        .setAssetId(asset_id)        .setAmount(40000000)    )        .addAction(        new Transaction.Action.SpendFromAccount()        .setAccountId("0G0NLBNU00A02")        .setAssetId(asset_id)        .setAmount(300000000)    )        .addAction(        new Transaction.Action.ControlWithAddress()        .setAddress(address)        .setAssetId(asset_id)        .setAmount(30000000)    ).build(client);    logger.info("template: " + template.toJson());    // use Template object's raw_transaction id to decode raw_transaction obtain a RawTransaction object    RawTransaction decodedTx = RawTransaction.decode(client, template.rawTransaction);    logger.info("decodeTx: " + decodedTx.toJson());    // need a private key array    String[] privateKeys = new String[]{"10fdbc41a4d3b8e5a0f50dd3905c1660e7476d4db3dbd9454fa4347500a633531c487e8174ffc0cfa76c3be6833111a9b8cd94446e37a76ee18bb21a7d6ea66b"};    logger.info("private key:" + privateKeys[0]);    // call offline sign method to obtain a basic offline signed template    Signatures signatures = new SignaturesImpl();    Template basicSigned = signatures.generateSignatures(privateKeys, template, decodedTx);    logger.info("basic signed raw: " + basicSigned.toJson());    // call sign transaction api to calculate whole raw_transaction id    // sign password is None or another random String    Template result = new Transaction.SignerBuilder().sign(client,                                                           basicSigned, "");    logger.info("result raw_transaction: " + result.toJson());    // success to submit transaction}

Multi-keys Example:

Need an account has two or more keys.

@Test// 使用 SDK 来构造 Template 对象参数, 多签public void testSignMultiKeys() throws BytomException {    Client client = Client.generateClient();    String asset_id = "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff";    String address = "sm1qvyus3s5d7jv782syuqe3qrh75fx23lgpzf33em";    // build transaction obtain a Template object    // account 0G1RPP6OG0A06 has two keys    Template template = new Transaction.Builder()        .setTtl(10)        .addAction(        new Transaction.Action.SpendFromAccount()        .setAccountId("0G1RPP6OG0A06")        .setAssetId(asset_id)        .setAmount(40000000)    )        .addAction(        new Transaction.Action.SpendFromAccount()        .setAccountId("0G1RPP6OG0A06")        .setAssetId(asset_id)        .setAmount(300000000)    )        .addAction(        new Transaction.Action.ControlWithAddress()        .setAddress(address)        .setAssetId(asset_id)        .setAmount(30000000)    ).build(client);    logger.info("template: " + template.toJson());    // use Template object's raw_transaction id to decode raw_transaction obtain a RawTransaction object    RawTransaction decodedTx = RawTransaction.decode(client, template.rawTransaction);    logger.info("decodeTx: " + decodedTx.toJson());    // need a private key array    String[] privateKeys = new String[]{"08bdbd6c22856c5747c930f64d0e5d58ded17c4473910c6c0c3f94e485833a436247976253c8e29e961041ad8dfad9309744255364323163837cbef2483b4f67",                                        "40c821f736f60805ad59b1fea158762fa6355e258601dfb49dda6f672092ae5adf072d5cab2ceaaa0d68dd3fe7fa04869d95afed8c20069f446a338576901e1b"};    logger.info("private key 1:" + privateKeys[0]);    logger.info("private key 2:" + privateKeys[1]);    // call offline sign method to obtain a basic offline signed template    Signatures signatures = new SignaturesImpl();    Template basicSigned = signatures.generateSignatures(privateKeys, template, decodedTx);    logger.info("basic signed raw: " + basicSigned.toJson());    // call sign transaction api to calculate whole raw_transaction id    // sign password is None or another random String    Template result = new Transaction.SignerBuilder().sign(client,                                                           basicSigned, "");    logger.info("result raw_transaction: " + result.toJson());    // success to submit transaction}

Multi-keys and Multi-inputs Example:

@Test// 使用 SDK 来构造 Template 对象参数, 多签, 多输入public void testSignMultiKeysMultiInputs() throws BytomException {    Client client = Client.generateClient();    String asset_id = "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff";    String address = "sm1qvyus3s5d7jv782syuqe3qrh75fx23lgpzf33em";    // build transaction obtain a Template object    Template template = new Transaction.Builder()        .setTtl(10)        // 1 input        .addAction(        new Transaction.Action.SpendFromAccount()        .setAccountId("0G1RPP6OG0A06") // Multi-keys account        .setAssetId(asset_id)        .setAmount(40000000)    )        .addAction(        new Transaction.Action.SpendFromAccount()        .setAccountId("0G1RPP6OG0A06")        .setAssetId(asset_id)        .setAmount(300000000)    )    // 2 input        .addAction(        new Transaction.Action.SpendFromAccount()        .setAccountId("0G1Q6V1P00A02") // Multi-keys account        .setAssetId(asset_id)        .setAmount(40000000)    )        .addAction(        new Transaction.Action.SpendFromAccount()        .setAccountId("0G1Q6V1P00A02")        .setAssetId(asset_id)        .setAmount(300000000)    )        .addAction(        new Transaction.Action.ControlWithAddress()        .setAddress(address)        .setAssetId(asset_id)        .setAmount(60000000)    ).build(client);    logger.info("template: " + template.toJson());    // use Template object's raw_transaction id to decode raw_transaction obtain a RawTransaction object    RawTransaction decodedTx = RawTransaction.decode(client, template.rawTransaction);    logger.info("decodeTx: " + decodedTx.toJson());    // need a private key array    String[] privateKeys = new String[]{"08bdbd6c22856c5747c930f64d0e5d58ded17c4473910c6c0c3f94e485833a436247976253c8e29e961041ad8dfad9309744255364323163837cbef2483b4f67",                                        "40c821f736f60805ad59b1fea158762fa6355e258601dfb49dda6f672092ae5adf072d5cab2ceaaa0d68dd3fe7fa04869d95afed8c20069f446a338576901e1b",                                        "08bdbd6c22856c5747c930f64d0e5d58ded17c4473910c6c0c3f94e485833a436247976253c8e29e961041ad8dfad9309744255364323163837cbef2483b4f67"};    logger.info("private key 1:" + privateKeys[0]);    logger.info("private key 2:" + privateKeys[1]);    // call offline sign method to obtain a basic offline signed template    Signatures signatures = new SignaturesImpl();    Template basicSigned = signatures.generateSignatures(privateKeys, template, decodedTx);    logger.info("basic signed raw: " + basicSigned.toJson());    // call sign transaction api to calculate whole raw_transaction id    // sign password is None or another random String    Template result = new Transaction.SignerBuilder().sign(client,                                                           basicSigned, "");    logger.info("result raw_transaction: " + result.toJson());    // success to submit transaction}

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