Nostr Signer

com.frontiercrown.signer/nostr-signerVersion 0.4.0

Approve Nostr signatures with your own browser signer without exposing a private key.

Status

Responds295 msNov 14, 2026, 13:58 UTCAnswered our handshake without sign-in.

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We could not refresh it, so this page shows the last copy.

Last checked: Nov 14, 2026, 13:58 UTC
Latency: 295 ms
Remotes responding: 1 of 1
Sign-in: No sign-in
Hosting: Hosted outside the EU (detected)
Registry data as of: Nov 14, 2026, 22:14 UTC

Data from the official MCP Registry, checked by run.zero. How we check

Connect

Streamable HTTP

https://signer.frontiercrown.com/mcpResponds295 msNov 14, 2026, 13:58 UTC

No sign-in

Claude Code

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

Claude Desktop and claude.ai

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Settings > Connectors > Add custom connector
Name: nostr-signer
Remote MCP server URL: https://signer.frontiercrown.com/mcp

Cursor

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

VS Code

code --add-mcp '{"name":"nostr-signer","type":"http","url":"https://signer.frontiercrown.com/mcp"}'

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Tools

17 tools

Tools of Nostr Signer
	Description		Read-only	Idempotent	Open world
`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.	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.	No	No	Not declared	Yes
`begin_nostrconnect_pairing`Advanced fallback: create a nostrconnect:// URI for the user to scan or open in a remote signer. Never accepts an nsec.	Advanced fallback: create a nostrconnect:// URI for the user to scan or open in a remote signer. Never accepts an nsec.	No	No	Not declared	Yes
`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.	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.	No	No	Not declared	Yes
`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, settle, activate, or prove identity.	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.	No	No	Not declared	Yes
`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.	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.	No	No	Not declared	Yes
`disconnect_signer`Forget the in-memory signer session and all prepared events.	Forget the in-memory signer session and all prepared events.	Yes	No	Not declared	No
`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.	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.	No	Yes	Not declared	Yes
`get_public_key`Return the public key exposed by the currently paired signer.	Return the public key exposed by the currently paired signer.	No	Yes	Not declared	No
`get_setup_url`Return the loopback-only page used to connect a NIP-07 browser extension or an advanced NIP-46 signer.	Return the loopback-only page used to connect a NIP-07 browser extension or an advanced NIP-46 signer.	No	Yes	Not declared	No
`get_signer_status`Check whether a user-controlled NIP-07 or NIP-46 signer is connected.	Check whether a user-controlled NIP-07 or NIP-46 signer is connected.	No	Yes	Not declared	No
`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.	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.	No	Yes	Not declared	No
`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, or settle an 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, or settle an invoice.	No	Yes	Not declared	Yes
`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.	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.	No	Yes	Not declared	Yes
`prepare_note`Prepare and bind an exact unsigned kind:1 note for user review. This does not sign or publish.	Prepare and bind an exact unsigned kind:1 note for user review. This does not sign or publish.	No	Yes	Not declared	No
`publish_event`Publish a previously verified signed event to configured relays. Requires separate explicit user intent.	Publish a previously verified signed event to configured relays. Requires separate explicit user intent.	Yes	No	Not declared	Yes
`query_events`Read a bounded set of verified public profile or note events from selected relays.	Read a bounded set of verified public profile or note events from selected relays.	No	Yes	Not declared	Yes
`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.	Ask the paired signer to approve and sign the exact event bound to a fresh intent. Requires explicit user intent and never publishes.	No	No	Not declared	Yes

Details

Registry status: Active
Published: Sep 11, 2026
Updated: Sep 11, 2026
Website: Not given
Repository: https://github.com/hudhaifahz/nostr-signer-chatgpt⁠ (opens in a new tab)
Categories (suggested): Invoicing and accounting Documents Browser automationSuggested categories are assigned automatically from the registry text and may be wrong. Verified operators can correct them.
GDPR: Not declared

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