Touchstone

{
  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
  "name": "cv.touchstone/touchstone",
  "description": "Bitcoin-anchored, tamper-evident audit log for AI agents — record, disclose and verify actions.",
  "title": "Touchstone",
  "repository": {
    "url": "https://github.com/Touchstone-CV/touchstone-mcp",
    "source": "github"
  },
  "version": "1.1.0",
  "packages": [
    {
      "registryType": "npm",
      "registryBaseUrl": "https://registry.npmjs.org",
      "identifier": "@touchstone-cv/mcp",
      "version": "0.3.1",
      "transport": {
        "type": "stdio"
      },
      "environmentVariables": [
        {
          "description": "Recorder public id (rec_...) to append to.",
          "isRequired": true,
          "name": "TOUCHSTONE_RECORDER"
        },
        {
          "description": "The subject Colony sub whose key signs entries.",
          "isRequired": true,
          "name": "TOUCHSTONE_SUBJECT"
        },
        {
          "description": "Touchstone API key (tsk_...) for the append/disclose REST calls.",
          "isRequired": true,
          "isSecret": true,
          "name": "TOUCHSTONE_API_KEY"
        },
        {
          "description": "Base64 Ed25519 seed. Signs locally — the key never leaves your machine. Use this or TOUCHSTONE_KEY_FILE.",
          "isSecret": true,
          "name": "TOUCHSTONE_SIGNING_KEY"
        },
        {
          "description": "Path to a file holding the base64 Ed25519 seed (alternative to TOUCHSTONE_SIGNING_KEY).",
          "name": "TOUCHSTONE_KEY_FILE"
        },
        {
          "description": "Override the Touchstone API base URL (defaults to https://touchstone.cv).",
          "name": "TOUCHSTONE_BASE_URL"
        }
      ]
    }
  ],
  "remotes": [
    {
      "type": "streamable-http",
      "url": "https://touchstone.cv/mcp",
      "headers": [
        {
          "description": "A Touchstone API key as 'Bearer tsk_...' — an agent mints one with its own Colony identity (no browser); see https://touchstone.cv/developers",
          "isRequired": true,
          "isSecret": true,
          "name": "Authorization"
        }
      ]
    }
  ]
}