CompoSecure

Arculus, built by the U.S.-based company CompoSecure, is a card-shaped cold storage hardware wallet for storing cryptocurrency and managing NFTs. The credit-card-sized Arculus Key Card stores encrypted private keys offline and communicates with a phone via tap-to-transact NFC, with no Bluetooth, WiFi or cables. The Arculus app adds 3-factor authentication using biometrics and a PIN.