Custos Clavium

Custos Clavium is a secure NFC companion that helps you manage sensitive data without storing secrets on your phone.

With Custos Clavium, your NFC card is the single source of truth for passwords, notes, OTP accounts, and wallet keys. The app provides a secure interface to view, organize, and use this data through encrypted communication and card-based authentication.

Use Custos Clavium to: • Access passwords and secure notes • Manage OTP accounts and generate time-based codes • Create and manage wallet records linked to keys stored securely on the card • View public wallet addresses and network data (when internet access is enabled) • Sign supported blockchain transactions with the card • Organize slots, labels, and records without moving secrets off the card

Custos Clavium is designed around a simple principle: secrets stay on the card. The app does not store private keys, wallet secrets, seed phrases, or other sensitive data as long-term local backups. Sensitive operations require card presence and NFC interaction.

Features: • NFC-based secure access • Card-first secret storage • Passwords, notes, wallets, and OTP records • BIP39-assisted input • Wallet derivation support • On-card signing for supported flows • App PIN and biometric protection • Configurable network and internet access settings

Custos Clavium is built for users who want stronger separation between their mobile device and their secrets, while keeping everyday access practical and fast.