About Tangem card
Tangem. Simply secure.
The Tangem card is a self-custodial hardware wallet. The main functions of Tangem cards are to securely create and store a private key and sign data.
The cards carry an EAL6+ certified secure smart-card chip based on ARM SC000 core architecture and having ISO14443 Type A contactless interface. Tangem’s card firmware is a native Сard OS (COS) providing a proprietary communication protocol on top of ISO14443 to interact with a contactless terminal. Once loaded into a particular card, COS binary code cannot be updated or managed.
Tangem does not develop or provide any server back-end for validation of the wallet balance. The system fully relies on the existing decentralized infrastructure of blockchain nodes with open external API. Tangem cards are self-sufficient, and the circulation of cards is uncontrolled. The only role of Tangem in the ecosystem is to sustain the card attestation chain ensuring the authenticity of the cards and integrity of COS.
Tangem card guarantees that it is the only place in the world that holds the private key. Therefore, it is not possible to export, import, restore or in some other way gain access to the wallet private key. Loss or physical destruction of the card is equivalent to loss of the wallet’s funds.
The Tangem card carries only one single secure chip providing direct end-to-end attestation of the entire device. This unique feature guarantees that you hold a genuine Tangem card, regardless of how and from where it was delivered to you.
The cards’ microprocessor employs many anti-tampering mechanisms that can recognize various types of invasive and non-invasive attacks. Tangem COS will react to attempts of such attacks according to its severity.
Tangem cards pass rigorous testing and can withstand environmental extremes, occasional mechanical deformation, electromagnetic pulse (EMP), electrostatic discharge (ESD) and X-rays within limits defined in ISO7810 standard.
Cards will also withstand unpredicted power outages that may occur when the NFC field or the host device is removed from the card. On-card data integrity is protected by a proprietary anti-tearing mechanism and triple storage redundancy. Embedded non-volatile memory (NVM) is certified and tested for more than 25 years of the data retention period.
It is recommended to avoid intentional bending with force and exposure to temperatures above 80℃, powerful X-rays and magnetic fields (e.g. MRI).