https://github.com/signum-network/signumj

SignumJ - Java Development Framework
https://github.com/signum-network/signumj

bitcoin blockchain burstcoin ethereum java jdk signum transaction

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SignumJ - Java Development Framework

• Host: GitHub
• URL: https://github.com/signum-network/signumj
• Owner: signum-network
• License: apache-2.0
• Created: 2018-09-27T15:07:32.000Z (about 6 years ago)
• Default Branch: master
• Last Pushed: 2024-06-29T21:20:05.000Z (5 months ago)
• Last Synced: 2024-09-30T13:42:13.231Z (about 2 months ago)
• Topics: bitcoin, blockchain, burstcoin, ethereum, java, jdk, signum, transaction
• Language: Java
• Homepage: https://signum.network/
• Size: 3.18 MB
• Stars: 29
• Watchers: 5
• Forks: 19
• Open Issues: 9
• Metadata Files:
  • Readme: README.md
  • License: LICENSE
  • Code of conduct: CODE_OF_CONDUCT.md

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README

        
# SignumJ

[![GPLv3](https://img.shields.io/badge/license-GPLv3-blue.svg)](LICENSE)

[![](https://jitpack.io/v/signum-network/signumj.svg)](https://jitpack.io/#signum-network/signumj)

Signum Java Development Framework

## Including in your project

* Maven:

```xml

	

	    jitpack.io

	    https://jitpack.io

	

    

	    com.github.signum-network

	    signumj

	    v1.3.1

	

```

* Gradle:

```gradle

repositories {

	maven { url 'https://jitpack.io' }

}

dependencies {

	implementation 'com.github.signum-network:signumj:v1.3.1'

}

```

## Usage

* Commonly used Signum objects / entities / helper classes can be found in the [entity](src/main/java/signumj/entity) package.

* For locally-performed cryptographic operations such as encrypting/decrypting, signing/verifying, etc please see the [SignumCrypto](src/main/java/signumj/crypto/SignumCrypto.java) interface (Use `SignumCrypto.getInstance()` to obtain a singleton instance)

* For Singum Node API calls such as making transactions and looking at blocks/accounts/transactions, please see the [NodeService](src/main/java/signumj/service/NodeService.java) interface. (Use `NodeService.getInstance("http://nodeAddress.com:8125")` to obtain an instance.)

The `NodeService` wraps the returned values in RxJava Singles. You can create your own `SchedulerAssigner` to automatically make all returned values subscribe on the specified schedulers. If you don't want to use RxJava, call `toFuture()` on any Single.

GSON is used for JSON serialization/deserialization. To obtain a `GsonBuilder` customized to serialize/deserialize the entities, call `SignumUtils.buildGson()`.

### SignumJ badge

If you use SignumJ on your project, please consider using one the badges available on the [style guide](https://signum.network/styleguide.html).

## Examples

Please see the [examples folder](src/test/java/signumj/examples).

Bellow a simple example on how to send a transaction and sign it locally.

```java

import signumj.Constants;

import signumj.crypto.SignumCrypto;

import signumj.entity.SignumAddress;

import signumj.entity.SignumValue;

import signumj.service.NodeService;

/**

 * Example which sends 1 SIGNA to another account with a fee of 0.1 SIGNA.

 * 

 * Performs the cryptographic signature locally so does not send the passphrase

 * to over the wire.

 * 

 */

public class SendTransactionBlockingGet {

	public static void main(String[] args) {

        NodeService node = NodeService.getInstance(Constants.HTTP_NODE_EUROPE2);

        String passphrase = "YOUR SENDING ACCOUNT PASSPHRASE, USED TO SIGN MESSAGES LOCALLY";

        

        SignumAddress recipient = SignumAddress.fromRs("S-JJQS-MMA4-GHB4-4ZNZU");

        SignumValue amountToSend = SignumValue.fromSigna(1);

        SignumValue fee = SignumValue.fromSigna(0.1);

        int deadline = 1440; // deadline in minutes before this transaction becomes invalid

        // Generate the transaction without signing it

        byte[] unsignedTransactionBytes = node.generateTransaction(recipient,

        		SignumCrypto.getInstance().getPublicKey(passphrase), amountToSend, fee, deadline, null).blockingGet();

        

        // Locally sign the transaction using our passphrase

        byte[] signedTransactionBytes = SignumCrypto.getInstance().signTransaction(passphrase, unsignedTransactionBytes);

        

        // Broadcast the transaction through the node, still not sending it any sensitive information.

        node.broadcastTransaction(signedTransactionBytes).blockingGet();

    }

}

```