Product
Graffito Bitcoin · Notes
Personal notes on the bitcoin blockchain. Compose, encrypt, and sign completely offline — on a Passport Prime or your own devices — then broadcast from anywhere. Your words, sealed by your keys, carried by the most durable public record ever built.
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Open source
PGP Keychain
OpenPGP keys on Passport Prime
Paper Wallet
Offline bitcoin gift bills
BIP-85 Seeds
Deterministic child seeds
Text Editor
Edit text on the Prime
PDF Viewer
Pure-Rust PDF reading
Image Viewer
Safe image decodingVerify our apps
Passport Prime apps from ByteApps are signed with our publisher certificate — byteapps.crt. Before trusting it on your device (Settings > Apps > Allowed Publishers), check that its fingerprint matches:
1bca27c8e765a77fd44922bc058b815b46e627d68f2996e8c38ca6997b6be6f9
Reproduce it yourself — SHA-256 of the certificate's compressed public key:
openssl x509 -in byteapps.crt -pubkey -noout | openssl ec -pubin -conv_form compressed -outform DER | tail -c 33 | shasum -a 256
Contact
ByteApps LLC · Denver, Colorado
contact@byteapps.com