# Custos OS

> Stateless by design


## Pages

- [Custos OS](https://custos-os.com/): Custos OS is an air-gapped bitcoin signer built on SeedSigner that loads your seed from a PIN-protected SeedKeeper smartcard, by contact or NFC, and forgets it at power-off.
- [Privacy](https://custos-os.com/privacy-policy/): Custos OS site privacy: no analytics, no tracking cookies, no third-party scripts.


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