4byte.sourcify.dev

Ethereum function and event signature database interface for Sourcify verified contracts.

Overview

A Next.js web interface for searching and looking up Ethereum function selectors and event signatures from the OpenChain API. The database is built from Sourcify verified smart contracts.

Features

• Text search: Use wildcards (*, ?) to find function/event signatures
• Hash lookup: Search by 4-byte function selectors or 32-byte event hashes
• Auto-detection: Automatically determines search type based on input format
• Copy to clipboard: Easy copying of signatures and hashes
• Statistics: Live count of functions and events in the database

Development

npm install
npm run dev

Open http://localhost:3000 to view the application.

Static Export

Build static files for deployment:

npm run build

Generated files will be in the out directory.

Environment Variables

Copy .env.example to .env.local and configure:

NEXT_PUBLIC_OPENCHAIN_API_URL=https://api.openchain.xyz
NEXT_PUBLIC_UMAMI_WEBSITE_ID=your-website-id