Two card-shaped hardware wallets that ditch cables, batteries, and Bluetooth are now competing for the same pocket. DCENT S, launched in July 2026 by South Korea's IOTRUST, and Tangem, a Swiss product with a longer track record, both rely on NFC to sign transactions — the phone's own radio field powers the chip. But the most critical difference between them isn't the shape or the chip; it's how they handle backup and recovery.
Backup and recovery: the R3covery Card vs. Tangem's approach
DCENT S ships with two cards, one of which is a dedicated 'R3covery Card.' The idea is that if you lose the main card, the second one can restore access. Tangem takes a different route: it generates the private key on-device and never lets it leave the secure element, but the company doesn't use a separate recovery card. Instead, Tangem relies on its app and a backup process that the company says is simpler for beginners. Both wallets generate keys on the secure element — keys never leave it — but the recovery mechanism is where the two designs diverge.
Durability and build: IP69 vs. IP69K plus X-ray protection
Both wallets are slim — DCENT S measures 85.6 by 54 mm and is 0.9 mm thick; Tangem is similarly sized. But Tangem pushes further on ruggedness. It carries an IP69K rating, which means it can withstand high-pressure, high-temperature water jets, plus resistance to X-rays, electrostatic discharge, and electromagnetic pulses. DCENT S has IP69 dust and water resistance, which is already high, but it doesn't claim protection against X-rays or EMP. Temperature range is close: DCENT S works from -30 to +50°C, Tangem from -25 to +50°C.
Security credentials: audits and anti-counterfeit features
Both wallets use EAL6+ certified secure elements — the same level found in government IDs and EMV payment cards. Both auto-lock after repeated wrong PIN entries and include tamper protection. But Tangem has published two independent firmware audits: one by Kudelski Security in 2018 and another by Riscure in 2023. DCENT S has not released equivalent third-party audits. Tangem also offers anti-counterfeit verification through its app; DCENT S does not emphasize that feature.
Form factor and warranty: a ring vs. a card
Tangem offers a wearable ring form factor in addition to the card. DCENT S sticks to the card shape. On warranty, Tangem gives 25 years of hardware coverage; DCENT S offers a limited lifetime warranty. Both are battery-free and powered entirely by the phone's NFC field during signing.
The two wallets share a lot of DNA — same secure element grade, same NFC power source, same on-device key generation. But the backup philosophy, the durability extras, and the audit history create real trade-offs. For now, DCENT S has not published the kind of third-party security audits that Tangem has, leaving that question open for potential buyers.
