OffChainPay

Seamless Crypto Payments – Online or Offline

OffChainPay is a hybrid payment solution enabling instant transactions using Ethereum-based cryptocurrencies, even in offline environments. Designed for speed, security, and accessibility, it bridges the gap between blockchain and everyday payments.

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🌟 Key Features

• Dual-Mode Payments – Works both online (via blockchain) and offline (via secure off-chain ledger).
• Ethereum Integration – Powered by smart contracts for transparent and immutable transactions.
• Fast Settlement – Instant payments without waiting for block confirmations in offline mode.
• Secure Architecture – Hash-based encryption and offline verification to prevent fraud.
• Cross-Platform – Usable on web and mobile for merchants and customers.

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🛠 Tech Stack

• Blockchain: Ethereum (Solidity Smart Contracts)
• Frameworks: Hardhat / Remix for development & deployment
• Languages: JavaScript, Solidity
• Security: SHA-256 / ECDSA-based signing
• Storage: Off-chain database + on-chain contract records

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🚀 How It Works

1. Online Mode:

   • User initiates payment
   • Smart contract validates & processes on Ethereum blockchain
   • Transaction receipt stored on-chain

2. Offline Mode:

   • Transaction request signed and stored locally
   • Secure verification via merchant node
   • Syncs with blockchain once connectivity is restored

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📌 Installation

# Clone repository
git clone https://github.com/yourusername/offchainpay.git

# Install dependencies
npm install

# Compile contracts
npx hardhat compile

# Deploy to testnet
npx hardhat run scripts/deploy.js --network sepolia