Tangem

Tangem is a self-custody cryptocurrency hardware wallet and companion app for storing and managing digital assets. Its NFC-powered cards contain a secure element that generates and keeps private keys inside the chip; multiple cards can be linked as backups, while a recovery seed phrase remains optional. Users tap a card to a phone to sign transactions and manage assets in the app, including sending, buying, selling, swapping, staking, and spending crypto across supported blockchain networks. The wallet requires no battery, cable, or charging, and the site describes an EAL6+-certified chip, audited firmware, and a 25-year limited hardware warranty.