Tangem is a hardware wallet in the form factor of a credit card. The private key is generated inside the card itself — in a certified secure element chip embedded in the plastic — and never leaves it. The card connects to a phone via NFC: tap the card to the phone, approve the transaction, and the card signs it without any data leaving the secure element. For Bitok Arena competitors who want hardware-grade key storage in a format that fits in a wallet alongside their other cards, Tangem offers a practical answer to the portability problem that makes traditional hardware wallets inconvenient to carry daily.
The private key is generated on the card, lives on the card, and signs on the card. NFC transmits only the data that needs signing — the transaction details — not the key. Tap to compete, tap to receive. The card does the rest.
Tangem sells cards in sets of two or three, with each additional card serving as a backup that holds the same key. The multi-card approach replaces the seed phrase model: instead of writing down a seed phrase, you have backup cards that restore access to the same addresses. This changes the backup workflow compared to traditional hardware wallets.
How Tangem Works for Bitok Arena Entry
Set up a Tangem wallet through the Tangem app on iOS or Android. During setup, the card generates a private key inside its secure element and produces a native SegWit Bitcoin address (bc1). If you have a two-card or three-card set, all cards in the set control the same key and address — any one of them can sign transactions. To enter Bitok Arena, open the Tangem app, navigate to the Bitcoin account, initiate a send to the master wallet address, and tap the Tangem card to the phone. The card receives the unsigned transaction via NFC, signs it inside the secure element, and returns the signed transaction to the app via NFC. The app broadcasts to the Bitcoin network.
The entire signing interaction takes a few seconds. There is no screen on the card to display transaction details — the confirmation happens in the Tangem app, not on the hardware itself. This is a meaningful difference from wallets like Ledger or Trezor that display the destination address on the device screen: with Tangem, the address verification happens in the app software, not in hardware-isolated display. For Bitok Arena competitors, verifying the destination address carefully in the Tangem app before tapping the card is the critical security step.
The no-seed-phrase model is a deliberate design choice by Tangem: seed phrases stored on paper introduce a human-readable copy of the private key that can be found, photographed, or stolen. Tangem's position is that multiple physical cards, each protected by PIN and stored separately, are more durable and less exposable than a paper phrase. For Bitok Arena participants who have struggled with seed phrase backup discipline, the card-based backup model is a meaningful practical alternative.