NFC Cards
near-field crypto hardware
NFC cards are crypto-enabled hardware devices that use near-field communication (NFC) technology to securely store private keys and authorize transactions when tapped against compatible readers (like smartphones or NFC wallets). Often shaped like standard credit cards, they offer a highly portable, tap-to-sign user experience for Web3 interactions while maintaining cold storage-level security. NFC cards are a newer class of hardware wallets, blending physical ease of use with cryptographic protection.
Use Case: A user sends XRP from their Tangem NFC card by tapping it to their phone, confirming the transaction through a secure appÔÇöno USB cables, passwords, or browser extensions needed.
Key Concepts:
- Near-Field Communication (NFC) ÔÇö Short-range wireless interface used for secure key access
- Cold Storage Functionality ÔÇö Private keys remain isolated and never touch the internet
- Tap-to-Sign ÔÇö Transactions are authorized by physical presence and confirmation
- Self-Custody ÔÇö User controls assets via card + wallet app, without third-party dependencies
- Mobile Web3 Compatibility ÔÇö NFC cards connect directly to dApps and DeFi interfaces via phone
Summary: NFC cards offer a next-generation solution for secure, convenient crypto storage and transaction signing. As a form of physical hardware wallet, they combine strong security (cold key storage) with seamless user experience (tap-to-confirm). Brands like Tangem are popularizing NFC cards as mobile-native alternatives to traditional USB devices like Ledger or Trezor. With rising demand for portable and intuitive access to DeFi, staking, and NFTs, NFC cards represent a key step toward mainstream-friendly self-custody in the Web3 era.