Developer Documentation

KeyLink is a decentralized NFC wallet key management protocol that allows users to securely store and access their cryptocurrency wallets using physical NFC cards.

Core Features:
• 🔒 Encrypted storage of wallet data (mnemonic phrases, private keys, etc.) on NFC cards
• 🛡️ Dual security protection with PIN and biometric authentication
• 📱 Third-party application authorization management system
• ✍️ Transaction signing and data read/write capabilities
• 📊 Complete access records and audit logs
• 🌐 Support for multiple mainstream Web3 wallet integrations

Technical Features:
• Cross-platform development with Flutter
• Local encrypted storage, with no data uploaded to the cloud
• Support for multiple card types (mnemonic, private key, password, data)
• Whitelist mechanism to ensure the security of third-party applications

Device Requirements:
• Android 6.0+ (API level 23+)
• NFC hardware support (required)
• Minimum RAM: 2GB
• Storage Space: 100MB
• Biometric support (recommended)

Development Environment:
• Flutter 3.0+
• Dart 3.0+
• Android SDK 23+
• NFC tags (NTAG213/215/216)

Supported Wallet Applications:
• MetaMask - Verified
• Trust Wallet - Verified
• Coinbase Wallet - Verified
• WalletConnect-compatible wallets
• Other Web3 wallets that support deep linking