Blockchain Messaging API

This project provides an API to store and retrieve user-specific messages on the blockchain. All blockchain operations are performed through a single application wallet, but the API allows associating each transaction with a specific user by storing userId along with the message data.

Table of Contents

• Features
• Prerequisites
• Installation
• Usage

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Features

• Store user-specific messages on the blockchain
• Retrieve all messages stored on the blockchain
• Fetch messages for a specific user by their userId

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Prerequisites

Make sure you have the following installed before running the project:

• Node.js
• npm
• Web3.js
• Active Metamask account with testnet blockchain (this project uses fantomTestnet)

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Installation

1. Clone the repository:

   git clone https://github.com/OsmosysSoftware/blockchain-backend-transaction
   cd blockchain-backend-transaction

2. Install the dependencies:

   npm install

3. Configure the .env file with your Ethereum account's private key and contract details:

   PRIVATE_KEY=<your-wallet-private-key>
   PROVIDER_URL=<your-testnet-blockchain-url>
   CONTRACT_ADDRESS=<your-deployed-contract-address>

4. Deploy the smart contract :

   You can either deploy the contract manually using truffle or hardhat or include a script in the project for automated deployment.

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Usage

1. Start the server:

   node server.js

   The server will run on http://localhost:3000.

2. Use the available API endpoints to store and retrieve messages. Check the API Document