Arculus
NFC metal card wallet with 3-factor tap-to-sign. Slick, but closed-source and app-dependent.
Overview
The Arculus is a premium NFC card wallet made by CompoSecure, a company known for manufacturing high-end metal payment cards. It brings that polished metal-card build to Bitcoin self-custody: a sleek card with no screen or battery that you tap to your phone to sign, secured by a three-factor model combining the physical card, a PIN, and your phone/biometrics. For people who want a slick, premium tap-to-sign experience that fits in a wallet, it's an attractive object.
Each card holds keys in a secure element, and signing happens on-tap through the Arculus app. The three-factor approach — something you have (the card), something you know (PIN), and your phone-based authentication — is the core of its pitch, aiming to make unauthorized use hard even if one factor is compromised. It supports Bitcoin and a range of other coins and has a genuinely premium feel.
The honest trade-offs mirror other screenless card wallets, plus one more: Arculus is closed-source and app-dependent, so you're trusting CompoSecure's firmware and the Arculus app rather than auditable code, and the wallet's usability leans heavily on that app remaining supported. With no screen of its own, you verify transactions on your phone, so you trust the phone's display more than a device that shows the destination itself. For a buyer who wants a premium, tap-to-sign metal card and isn't focused on open-source or air-gap, Arculus is a stylish option; those who prioritize verifiability should look to open-source devices with their own screens.
Key features
- Premium metal NFC card from CompoSecure (a payment-card maker)
- Three-factor security: card + PIN + phone/biometrics
- Secure element key storage; tap-to-sign via the Arculus app
- No battery or screen; slim and durable
- Supports Bitcoin and a range of other coins
- Polished, premium build quality
- Pocketable card form factor
Specs
- connection NFC
- open Source No
- secure Element Yes
Who it’s for
People who want a premium tap-to-sign card and don’t need open source.
Arculus: frequently asked questions
Is the Arculus open-source?
No. It's closed-source and app-dependent, so you're trusting CompoSecure's firmware and the Arculus app rather than auditable code.
How does the three-factor security work?
It combines the physical card, a PIN you know, and your phone/biometric authentication, so an attacker needs more than just the card to move funds.
Do I verify transactions on the card?
No — the card has no screen, so you verify on your phone. That means trusting the phone display more than a device that shows the destination itself.
What happens if the Arculus app is discontinued?
Because it's app-dependent, long-term usability relies on continued app support. As with any wallet, keep your recovery seed so you could restore elsewhere.
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