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Chainvoice

Chainvoice is a decentralized invoicing dApp for EVM-compatible chains. Create, send and pay invoices on-chain in the network's native coin or any ERC-20 token, with invoice details encrypted end to end. The contract has no owner and isn't upgradeable, and it can be deployed to any EVM chain. Live deployments are listed in Deployments.md.

Table of Contents

• Overview
• Features
• Project Structure
• Getting Started
• Frontend Setup
• Run with Docker
• Smart Contract Testing
• Deploy to an EVM Chain
• Environment Variables
• Community and Support

Overview

Chainvoice transforms traditional invoicing by leveraging blockchain technology to create a trustless, automated payment system. Users can create invoices, manage payments, and track transaction history with complete transparency and security.

Features

• Decentralized Invoice Creation - Create and manage invoices on-chain
• Multi-Token Support - Pay using native currency or ERC-20 tokens
• Immutable Records - Verifiable transaction history and status tracking
• Treasury Management - Built-in fee management for platform sustainability
• Privacy Protection - Encrypted invoice data with access control
• User-Friendly Interface - Intuitive web application with wallet integration: browser wallets connect through WalletLink (EIP-6963), with no WalletConnect relay or project ID

Project Structure

Chainvoice/
├── frontend/ # Web application (UI/UX, wallet integration)
├── contracts/ # Solidity smart contracts (core invoicing logic)
├── docs/ # Documentation and guides
└── README.md # This file

Getting Started

1. Fork the repository
2. Clone your fork

git clone https://github.com/YOUR_USERNAME/Chainvoice.git
cd Chainvoice

Frontend Setup

1. Navigate to frontend directory
   cd frontend

2. Install dependencies
   npm install

3. Start development server
   npm run dev

4. Open application Navigate to http://localhost:5173 in your browser

Run with Docker

Prefer containers? One command brings up the frontend together with a ThruBox relay, which invoice sending and receiving depend on — no Node.js install, and no second repository to clone:

cp frontend/.env.example frontend/.env
docker buildx build -t chainvoice/thrubox-relay:main "https://github.com/AOSSIE-Org/ThruBox-Server.git#main"
docker compose up --build

The app is then at http://localhost:5173 and the relay at http://localhost:3000. See docs/docker.md for the full guide, including the production profile that serves the built bundle behind nginx.

Smart Contract Testing

Prerequisites: Foundry must be installed

1. Navigate to contracts directory
   cd contracts

2. Run test suite
   forge test

3. Run tests with verbosity (optional)
   forge test -vvv

Deploy to an EVM Chain

The same contract and deploy script work on any EVM chain.

Prerequisites

• Foundry installed
• A wallet funded with the chain's native coin
• An RPC URL for the chain

Deployment Steps

1. Configure environment variables
   cp contracts/.env.example contracts/.env
   Edit contracts/.env with your actual values

2. Compile contracts
   cd contracts
   forge build

3. Load environment variables
   source .env

4. Deploy
   The script reads DEV_ADDRESS and DEV_FEE_RECEIVER (both required, non-zero) and an optional DEV_FEE_WEI (default 0.0005 ether, must not be 0) from .env, and passes them to the constructor. The dev address sets devFee and devFeeReceiver and hands its own role over in two steps (proposeDev, then acceptDev from the new address), so use a multisig; devFeeReceiver receives withdrawn fees. The compiler targets evm_version = "london" with via_ir (see contracts/foundry.toml), so one bytecode also runs on chains that have not adopted newer EVM upgrades.

RPC_URL=https://your-chain-rpc.example  # the chain's RPC endpoint
forge script script/Chainvoice.s.sol:DeployChainvoice --rpc-url "$RPC_URL" --account deployer --broadcast

Chain-specific flags:

• No EIP-1559 (no base fee): add --legacy, or forge script fails with unsupported feature: eip1559.
• Verification (recommended): add --verify on a chain Etherscan supports (needs ETHERSCAN_API_KEY). For a chain with a Blockscout explorer, add --verify --verifier blockscout --verifier-url "$EXPLORER_URL/api/" instead, with EXPLORER_URL set to the explorer's base URL (no key needed).
• Higher on-chain gas than forge simulates (Sepolia, for example): add --gas-estimate-multiplier 800.
• Block gas limit: a full 30-invoice batch needs about 6.2M gas, so the chain's block gas limit should be at least 8M.

After deploying, record the address in Deployments.md.

5. Configure frontend
   cp frontend/.env.example frontend/.env
   Edit frontend/.env and set the variable for the chain you deployed to — the frontend reads VITE_CONTRACT_ADDRESS_<chainId>, not a single shared variable, for example:
   VITE_CONTRACT_ADDRESS_=your_deployed_contract_address_here
   See Environment Variables for the full list.

6. Restart frontend development server
   cd frontend
   npm run dev

Environment Variables

Frontend Configuration (frontend/.env)

#Base (8453)
VITE_CONTRACT_ADDRESS_8453=0x9b31091AA0b4F287114B2A9a3D239Db04a9A07E1
#Ethereum Sepolia (11155111)
VITE_CONTRACT_ADDRESS_11155111=0x6E5Ac5C2c10b4eD34909CFf0DF776832504E9677
#Mordor Testnet (63)
VITE_CONTRACT_ADDRESS_63=0x9b306924Eef2f021E1BC8a54202E90057E3988d8
#Polygon Amoy (80002)
VITE_CONTRACT_ADDRESS_80002=0xBee456a4eF315273E9b6bC1C9eE0737aefD461e0
#Polygon Mainnet (137)
VITE_CONTRACT_ADDRESS_137=0x9b31091AA0b4F287114B2A9a3D239Db04a9A07E1
#Ethereum Classic (61) — blank until redeployed, see note below
VITE_CONTRACT_ADDRESS_61=

⚠️ Renaming the key registry functions changed their selectors, so only a contract deployed from the current contracts/src/Chainvoice.sol will answer. The addresses above are such deployments, and Deployments.md is the record of every deployment. Keys registered against an earlier deployment do not carry over; those users must register again.

⚠️ Ethereum Classic is left blank on purpose. It still runs only the v1 contract, which stores invoice payloads on-chain as strings and has no public key registry, so it does not match the current ABI. The app treats any non-empty address as supported, so filling it in would send calls that contract cannot decode. Populate it only after a v2 deployment.

⚠️ Security Note: Never commit .env files to version control. Keep your private keys secure.

Relay configuration

Invoice payloads travel encrypted over a ThruBox relay, configured with:

VITE_RELAY_URL=http://localhost:3000
VITE_RELAY_API_KEY=
VITE_RELAY_TIMEOUT_MS=

• VITE_RELAY_URL — in development this is the target the Vite dev server proxies /relay to, so the browser stays same-origin. In production, either an absolute https:// URL (which requires CORS on the relay) or a path such as /relay that your host rewrites to it (Vercel rewrites, Netlify redirects, nginx proxy_pass), which avoids CORS entirely.
• VITE_RELAY_API_KEY — only needed if the relay sets security.api_key. This is not a secret: Vite inlines every VITE_-prefixed variable into the built JavaScript, so any visitor can read it. Treat it as a spam speed-bump, not access control. To keep a relay key private, proxy relay calls server-side and inject it there.
• VITE_RELAY_TIMEOUT_MS — request timeout, default 15000. Raise it (around 60000) on hosts that suspend idle instances: a cold start can take most of a minute, and sends are deliberately not retried, so a timeout means an undelivered invoice.

Deployed Contracts

v2 (current)

Stores only keccak256 of the invoice data on-chain and exposes the public key registry. Deployments.md is the full record, including constructor parameters and deployment blocks.

• Base (8453), mainnet 0x9b31091AA0b4F287114B2A9a3D239Db04a9A07E1
• Polygon (137), mainnet 0x9b31091AA0b4F287114B2A9a3D239Db04a9A07E1
• Ethereum Sepolia (11155111), testnet 0x6E5Ac5C2c10b4eD34909CFf0DF776832504E9677
• Mordor (63), Ethereum Classic testnet 0x9b306924Eef2f021E1BC8a54202E90057E3988d8
• Polygon Amoy (80002), testnet 0xBee456a4eF315273E9b6bC1C9eE0737aefD461e0

v1 (Mainnet Deployment — Jan 1)

Stores the invoice payload on-chain as strings. Superseded, kept for reference.

• Ethereum Sepolia (11155111) 0x54a542dCDC306eE281b5De4613EcEfe6e6ABc562
• Ethereum Classic (61) 0xD044A85a5daC307217B9bF313A90E8a60AF7DdCe
• Polygon Mainnet (137) 0xD044A85a5daC307217B9bF313A90E8a60AF7DdCe

Release: release v1

Community and Support

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Contributing

We welcome contributions! Please read our contributing guidelines and submit pull requests for any improvements.

Before making or updating any smart contract changes, please review the Smart Contract Contribution Guidelines to ensure compliance with testing, design, and review requirements.

Built with ❤️ by Stability Nexus.

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