CustID CustID is a mobile identity vault built on Nostr and the SISTR protocol. Governments everywhere are rolling out national e-ID — the EUDI Wallet across the EU, Switzerland's e-ID, and more. Those wallets can work well, yet your recognized identity is still issued, attested and revocable by an authority. CustID flips that: your identity simply IS your key, held on your device, and no one can take it from you. One app to hold your identities, memberships, badges and passes — offline, without Google. Identity vault: multiple identities, keys protected by the hardware-backed Android Keystore, never held in plaintext during normal operation; moving or backing up an identity only ever exports an encrypted ncryptsec, never a raw key. Nostr signer (NIP-46 bunker): sign for any NIP-46 compatible client remotely; your key never leaves your device. No Google: no Firebase Cloud Messaging, no Google Play Services. Distributed via Zapstore only. NFC challenge-response: answer access-control challenges with a tap (doors, gates, event ticketing, ...). QR code proofs: scan or present signed proofs as an NFC fallback. Zero-knowledge proofs: planned in the SISTR project, for privacy-preserving identity claims. 👷 MVP public beta. ⚠ Please backup your keys and don't use CustID for critical applications until a stable release is published.