Patent number 12307443, issued by the United States Patent and Trademark Office, covers the technology behind the wearable cold wallet. Tangem’s ring incorporates a secure embedded chip that stores a user’s private cryptographic keys. To sign a blockchain transaction initiated on a smartphone, the user brings the ring near the phone, utilizing near-field communication (NFC) technology.

The signing process occurs entirely within the ring’s secure element; the private key is never transmitted externally. According to the announcement shared with Bitcoin.com News, Tangem stated the patented architecture ensures private keys remain isolated within the device, aiming to provide hardware-grade security. The Zug-based company is also developing contactless cryptocurrency payment functionality for the ring.

The company explained to our newsdesk that this marks Tangem’s third U.S. patent awarded in 2025. Previous patents cover a private key backup system and a cryptocurrency payment card that integrates self-custody with transactions. The company’s patent portfolio, including the new ring patent valid for 20 years, is positioned to support licensing and business partnerships.

Tangem said it sees an opportunity in the growing smart ring market. The firm believes that the global market for smart rings will experience double-digit compound annual growth, driven partly by demand for wearable payment and identity solutions. Tangem, founded in 2017, is headquartered in Switzerland and reports that it serves users in more than 220 countries.

Its existing product line includes card-shaped hardware wallets. According to the team, the patented ring represents an expansion into the wearable finance sector, targeting users seeking self-custody combined with wearable convenience.

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