Development Kit

Golang

geth

Geth ships official Go packages that can be embedded into third party desktop and server applications.

docs link: https://geth.ethereum.org/docs/developers/dapp-developer/native

Java

web3j

web3j is a highly modular, reactive, type safe Java and Android library for working with Smart Contracts and integrating with clients (nodes) on the Ethereum network. This allows you to work with Ethereum blockchains, without the additional overhead of having to write your own integration code for the platform.

docs link: https://www.web3labs.com/web3j-sdk

JavaScript

ethers.js

ethers.js is a complete and compact library for interacting with the EVM-compatible Blockchain and its ecosystem.

docs link: https://docs.ethers.org/v5/

web3.js

web3js is a highly modular, reactive, type safe Java and Android library for working with Smart Contracts and integrating with clients (nodes) on the Ethereum network. This allows you to work with Ethereum blockchains, without the additional overhead of having to write your own integration code for the platform.

Installation

To start using web3.js in your project, run:

npm install web3

Basic Setup

Before using web3.js, you need to import and initialize it in your project:

// web3.js v1
const Web3 = require('web3');

// web3.js v4
const { Web3 } = require('web3');

Connecting to HashKey Chain

To connect to HashKey Chain Mainnet, use:

const web3 = new Web3('https://mainnet.hsk.xyz');

Reading Blockchain Data

Once connected, you can interact with the network. Here's an example of fetching the latest block:

async function getLatestBlock() {
    const latestBlock = await web3.eth.getBlockNumber();
    console.log(`Current block number: ${latestBlock}`);
}

Account Management

Create and manage accounts securely:

const privateKey = "YOUR_PRIVATE_KEY";
const account = web3.eth.accounts.privateKeyToAccount(privateKey);
console.log(`Account address: ${account.address}`);

Smart Contract Interaction

To interact with smart contracts on HashKey Chain:

const contractABI = [
    // Your contract ABI here
];
const contractAddress = "YOUR_CONTRACT_ADDRESS";
const contract = new web3.eth.Contract(contractABI, contractAddress);

// Read contract data
async function readContract() {
    const result = await contract.methods.getValue().call();
    console.log(`Contract value: ${result}`);
}

// Write to contract
async function writeContract(newValue) {
    const tx = await contract.methods.setValue(newValue).send({
        from: account.address,
        gas: 200000
    });
    console.log(`Transaction hash: ${tx.transactionHash}`);
}

For more detailed information and advanced features, visit the web3.js documentation.

Python

web3.py

web3.py is a Python library for interacting with Ethereum to help with sending transactions, interacting with smart contracts, reading block data, and a variety of other use cases.

Installation Requirements

• Python version 3.10+

• Poetry package manager

Setup Steps

1. Set Up Development Environment

   python --version    # Should be 3.10+
   poetry --version   # Verify Poetry installation

2. Install web3.py

   poetry install web3

3. Basic Usage Example

   from web3 import Web3
   
   # Connect to HashKey Chain testnet
   w3 = Web3(Web3.HTTPProvider('https://hashkeychain-testnet.alt.technology'))
   
   # Verify connection
   print(w3.is_connected())

4. Environment Configuration Create a .env file with your credentials:

   cp .env.local .env
   # Edit .env with your credentials

docs link: web3py