Cryobrick

Air-gapped cold storage on your feature phone. Zero cost. No shipping. Plausible deniability.

Why CryoBrick?

Addressing the critical gaps in Bitcoin self-custody: visibility, cost, privacy, and accessibility. Plausible Deniability

Looks like a normal feature phone. No one can tell you're using it for Bitcoin custody just by looking at it. Air-Gapped Security

Absolute physical separation. Keys are generated and stored on a device that has never touched a packet of data. Zero Cost

No hardware purchase required. If you have a feature phone, you can turn it into cold storage at zero additional cost. No Shipping, No Waiting

No customs delays, no shipping restrictions, no geographic barriers. If you can get a feature phone, you can use CryoBrick.

No Personal Information

We don't collect your data. No email, no address, no accounts. The wallet runs entirely on your device. Standard Support

Full support for Native SegWit (BIP84) and PSBT signing. Compatible with Blue Wallet, Sparrow, and more. The Problem We Solve

Bitcoin's cryptography is nearly unbreakable in the digital world. But securing Bitcoin physically? That's where users face real danger.

Traditional self-custody methods—paper backups, metal plates, hardware wallets—all expose users to three critical risks: theft by criminals, confiscation by authorities, and recognition by anyone looking.

Hardware wallets offer excellent cryptographic security, but they come with critical shortcomings: zero plausible deniability, cost barriers, privacy data leaks, and geographic restrictions.

CryoBrick addresses these vulnerabilities with a solution that's secure, affordable, and—most importantly—invisible.