# Frontiercrown Signer Nostr Signer MCP server

Source: https://glimind.com/server/mcp-registry%2Fcom.frontiercrown.signer%2Fnostr-signer
Registry id: `mcp-registry/com.frontiercrown.signer/nostr-signer`
Status: live (checked 2026-10-27T10:02:02.342Z)

## Measurements (30 days)

- Uptime: 100%
- Checks: 5019
- Outages (90 days): 1

## Install

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

Claude Code:

```sh
claude mcp add --transport http frontiercrown-signer-nostr-signer-mcp-se https://signer.frontiercrown.com/mcp
```

## Tools (17)

- `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, 
- `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 nse
- `create_grynvault_nip05_invoice`: After separate explicit user confirmation, sign the prepared authorization and create exactly one pending 2,000-sat name@frontiercrown.com invoice. Does not pay
- `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
- `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
- `get_public_key`: Return the public key exposed by the currently paired signer.
- `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.
- `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.
- `prepare_grynvault_nip05_invoice`: 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, o
- `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 si
- `prepare_note`: Prepare and bind an exact unsigned kind:1 note for user review. This does not sign or publish.
- `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.
- `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.

Measured by Glimind (https://glimind.com): MCP handshake + tool list only, no tool is ever called. CC BY 4.0.