Nostr Onchain: Keys, Signatures, Nothing in Between

Why it surfaced

Nostr Onchain puts a surprisingly broad signing stack in one focused package: a touchscreen USB-C signer, client-side taproot PSBT tools, social multisig from npubs, and OP_RETURN-linked notes. Its central promise—“Plugged in = you can sign. Unplugged = you can't.”—makes the project’s hardware-first philosophy unusually legible.

A self-custody signing ecosystem for Nostr events and Bitcoin transactions, spanning a web client, hardware signer, browser extension, and NIP-46 bridge.