@powforge/mcp-identity

MCP server that scores any Nostr pubkey's depth-of-identity before your handler runs. Chaintip-anchored Schnorr cert, L402 priced, drop-in for AI agents that need Sybil resistance on top of paid APIs.

npm: npm i @powforge/mcp-identity

Homepage: https://powforge.dev/explorer

Whitepaper: https://powforge.dev/whitepaper

What It Does

Three MCP tools that wrap the PowForge Depth-of-Identity Oracle:

• `doi_score_lookup` — given a Nostr pubkey (hex or npub), returns multi-dimensional identity score (network, longevity, kinetic-filter cost). L402-priced via the upstream oracle.
• `doi_sign_vouch` — builds an unsigned Nostr event for vouching depth-of-identity for another pubkey. Caller signs; oracle counts toward score on observation.
• `doi_score_verify` — offline Schnorr verification of a signed DoI cert returned from the oracle. No network.

Why Identity-Anchored Pricing

Most paid-API services charge per-request flat. That fails on agent-to-agent surfaces where:

1. New agents look identical to scrapers — no signal on intent or risk.
2. Long-tail abusers extract value cheaper than they impose cost.
3. Whitelist gating doesn't scale to open agent ecosystems.

DoI gives your server a quantitative number for "how much would it cost to fake this caller's identity at this depth" — anchored to a specific Bitcoin chaintip cert that's non-repudiable. Use it as a multiplier on your L402 macaroon price, a rate-limit input, or a routing key.

Quick Start

npm i @powforge/mcp-identity

Add to your MCP config (Claude Desktop, Cursor, etc):

{
  "mcpServers": {
    "powforge-identity": {
      "command": "npx",
      "args": ["-y", "@powforge/mcp-identity"]
    }
  }
}

Restart the client. Three new tools appear under powforge-identity.

Why Chaintip-Anchored

The score includes a Schnorr signature over (score, dimensions, score_chaintip_height, score_chaintip_blockhash). That binds the claim to Bitcoin's kinetic filter — recomputable PageRank scores can be silently rewritten, but a chaintip-anchored cert is a fixed claim against a known time. Verification is offline.

The oracle's falsifiable claim window is documented in the whitepaper.

L402 Pricing

The MCP server transparently handles the L402 macaroon dance with oracle.powforge.dev. First call returns a 402 with a Lightning invoice; the wrapper pays from a wallet you configure (env: LNBITS_INVOICE_KEY) and retries. No keys, no accounts.

Status

• v0.7.0 published to npm 2026-04-28.
• Three tools exposed.
• Cert format documented in the whitepaper.
• Oracle availability monitored at https://powforge.dev/oracle/freshness.

License

MIT.

Source

Source lives in a private development repo. Issues, questions, and bug reports welcome here.