Nostr Onchain

Your keys. Your signatures.
Nothing in between.

Hardware and software for sovereign signing — Nostr events and Bitcoin transactions, signed on devices you hold, verified by code you can read. No custodians, no accounts, no trusted third parties.

Nostr Onchain Client

Web client

The flagship client — dual Nostr + Bitcoin signer, social multisig from npubs, and OP_RETURN-linked notes.

Pocket Signer

Hardware Preorder now — ships November

A USB-C hardware signer with a touch screen. Real BIP-340 signatures on-device, tap to approve every event and every transaction.

nostrtx

Web app

Bitcoin transactions for Nostr keys. Build taproot PSBTs, collect multisig signatures, broadcast — entirely client-side.

Pocket Signer Link

Browser extension

The browser extension for the Nostr Onchain Pocket Signer. Plugged in = you can sign. Unplugged = you can't.

Bunker Bridge

Device feature

NIP-46 remote signing from your phone or any bunker-aware client, with every request approved on the device screen.