Nostr Signer MCP server

• approve_grynvault_browser_handoffFree

  Sign a short-lived, read-only Grynvault account handoff code so the browser tab that created it can receive its own dashboard. This does not create an invoice, publish a Nostr event, change settlement, or grant wallet custody.

• begin_nostrconnect_pairingFree

  Advanced fallback: create a nostrconnect:// URI for the user to scan or open in a remote signer. Never accepts an nsec.

• connect_bunkerFree

  Connect a bunker:// URI only when the user knowingly supplied it. Prefer the local setup page so connection secrets are not placed in chat. Never accepts an nsec.

• create_grynvault_nip05_invoicewrite actionFree

  After separate explicit user confirmation, sign the prepared authorization and create exactly one pending 2,000-sat name@frontiercrown.com invoice. Does not pay, settle, activate, or prove identity.

• create_grynvault_supporter_invoicewrite actionFree

  After separate explicit user confirmation, sign the prepared authorization and create exactly one pending Grynvault supporter invoice. Does not pay it and never treats a redirect as settlement.

• disconnect_signerFree

  Forget the in-memory signer session and all prepared events.

• get_grynvault_account_dashboardFree

  Read the connected Nostr identity's Grynvault supporter, payment, and NIP-05 dashboard using a short-lived signed authorization. This does not create an invoice or change settlement.

• get_public_keyFree

  Return the public key exposed by the currently paired signer.

• get_setup_urlFree

  Return the loopback-only page used to connect a NIP-07 browser extension or an advanced NIP-46 signer.

• get_signer_statusFree

  Check whether a user-controlled NIP-07 or NIP-46 signer is connected.

• prepare_eventFree

  Validate and bind an exact unsigned Nostr event for user review. This does not sign or publish. Show the user every field before requesting a signature.

• prepare_grynvault_nip05_invoiceFree

  Check and normalize a name@frontiercrown.com identifier, then prepare its exact 2,000-sat invoice authorization. Does not sign, reserve the name, create, pay, or settle an invoice.

• prepare_grynvault_supporter_invoiceFree

  Prepare an exact, short-lived signed-authorization request for a one-time donation of 21 to 1,000,000 sats or the fixed 2,100-sat 30-day membership. Does not sign, create, pay, or settle an invoice.

• prepare_noteFree

  Prepare and bind an exact unsigned kind:1 note for user review. This does not sign or publish.

• publish_eventwrite actionFree

  Publish a previously verified signed event to configured relays. Requires separate explicit user intent.

• query_eventsFree

  Read a bounded set of verified public profile or note events from selected relays.

• sign_eventFree

  Ask the paired signer to approve and sign the exact event bound to a fresh intent. Requires explicit user intent and never publishes.

• –Code scanremote-only server, no package to scann/a
• Live reliabilityremote reachable in 235ms20/20
• Tool poisoning17 tool descriptions checked15/15
• Auth qualityopen endpoint exposes 3 write-action tools with no auth3/15
• Maintenancelast push 8 days ago15/15
• Maintainer identitynamespace and repository owner differ; GitHub account older than a year5/10

Nostr Signer: common questions

Is Nostr Signer MCP server safe?

Mostly: it is graded B (77/100). Read the Nostr Signer safety report

How do I install Nostr Signer?

It runs remotely at signer.frontiercrown.com. Add it to Claude Code, Claude Desktop or Cursor with the snippets above, or call it through the mcp.market gateway without installing anything.

Does Nostr Signer need an API key?

Not as far as the registry entry and our scan can tell: no credentials are declared or required.

Is Nostr Signer maintained?

The last commit was 9 days ago (2026-09-11). The latest release is v0.4.0.

Is Nostr Signer up?

100% of our last 2 checks got an answer. We check remote servers about four times a day.

What can I use instead of Nostr Signer?

Servers from other publishers that do the same job: Novada MCP server, SeleniumBase MCP server and AIHawk MCP server. Compare all Nostr Signer alternatives.