Nostr Signer

Reliability

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How to connect

Add it to any MCP client that supports remote servers.

{
  "mcpServers": {
    "nostr-signer": {
      "type": "http",
      "url": "https://signer.frontiercrown.com/mcp"
    }
  }
}

17 tools

• get_setup_url

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

• get_signer_status

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

• begin_nostrconnect_pairing

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

• connect_bunker

  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.

• get_public_key

  Return the public key exposed by the currently paired signer.

• prepare_note

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

• prepare_event

  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.

• sign_event

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

• publish_event

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

• query_events

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

• disconnect_signer

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

• get_grynvault_account_dashboard

  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.

• approve_grynvault_browser_handoff

  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.

• prepare_grynvault_supporter_invoice

  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.

• create_grynvault_supporter_invoice

  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.

• prepare_grynvault_nip05_invoice

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

• create_grynvault_nip05_invoice

  After separate explicit user confirmation, sign the prepared authorization and create exactly one pending 2,000-sat [email protected] invoice. Does not pay, settle, activate, or prove identity.

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