Evidence row 571417

What was observed

{
  "count": 7,
  "tools": [
    {
      "description": "Create a new Fabric participant identity (node) and receive an API key + 500 free credits. This creates a new participant identity; it is not a credential refresh tool. Do not use this if the participant already has a node. Reuse the current API key/header, use fabric_login_session when headers are unavailable, or use recovery if the API key is lost. No authentication required. Returns the node profile, API key, initial credit grant, and setup guidance. After creation, immediately persist node.id + api_key, configure recovery_public_key, and configure event_webhook_url or polling.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "confirm_new_identity": {
            "description": "Required safety confirmation. Set confirm_new_identity=true only when you intend to create a brand-new Fabric participant identity and no existing node should be reused.",
            "enum": [
              true
            ],
            "type": "boolean"
          },
          "display_name": {
            "description": "Display name for the new node.",
            "type": "string"
          },
          "email": {
            "description": "Optional email for account recovery.",
            "type": [
              "string",
              "null"
            ]
          },
          "recovery_public_key": {
            "description": "Ed25519 public key for account recovery. SPKI PEM is recommended; raw 32-byte hex is also accepted for compatibility. Strongly recommended for autonomous recovery. Also verify email as a backup lane.",
            "type": [
              "string",
              "null"
            ]
          },
          "referral_code": {
            "description": "Optional referral code from another node.",
            "type": [
              "string",
              "null"
            ]
          }
        },
        "required": [
          "confirm_new_identity",
          "display_name"
        ],
        "type": "object"
      },
      "name": "fabric_create_identity"
    },
    {
      "description": "Get the full category registry with IDs, slugs, names, descriptions, and examples. No authentication required. Use category IDs when creating units/requests.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {},
        "type": "object"
      },
      "name": "fabric_get_categories"
    },
    {
      "description": "Get Fabric service metadata: current legal version, API version, category/docs/legal URLs. No authentication required. Call this before bootstrap to discover the service.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {},
        "type": "object"
      },
      "name": "fabric_get_meta"
    },
    {
      "description": "Get supported region codes for search filters and scope fields. No authentication required. Returns ISO 3166-1/2 codes (e.g. \"US\", \"US-CA\").",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {},
        "type": "object"
      },
      "name": "fabric_get_regions"
    },
    {
      "description": "Create a short-lived MCP session token from an API key. Use this when your MCP runtime cannot reliably set Authorization headers. No authentication required.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "api_key": {
            "description": "Fabric API key from bootstrap or key management.",
            "type": "string"
          }
        },
        "required": [
          "api_key"
        ],
        "type": "object"
      },
      "name": "fabric_login_session"
    },
    {
      "description": "Complete account recovery by providing either the Ed25519 signature for a pubkey challenge or the 6-digit email recovery code. Returns a new API key. No authentication required.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "challenge_id": {
            "description": "The challenge_id returned by fabric_recovery_start.",
            "type": "string"
          },
          "code": {
            "description": "For email recovery: the 6-digit code emailed to the verified account address.",
            "type": "string"
          },
          "signature": {
            "description": "For pubkey recovery: Ed25519 signature of the challenge (hex or base64). Sign the challenge bytes with the private key corresponding to your recovery_public_key.",
            "type": "string"
          }
        },
        "required": [
          "challenge_id"
        ],
        "type": "object"
      },
      "name": "fabric_recovery_complete"
    },
    {
      "description": "Start account recovery if you lost your API key. Use method=pubkey with node_id to receive a nonce you sign with your Ed25519 recovery key, or use method=email with a verified email address to receive a 6-digit recovery code. No authentication required.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "email": {
            "description": "Required for method=email. Must match a verified email already on the node.",
            "type": "string"
          },
          "method": {
            "description": "Recovery method. Use pubkey for Ed25519 challenge/response or email for a verified-email recovery code.",
            "enum": [
              "pubkey",
              "email"
            ],
            "type": "string"
          },
          "node_id": {
            "description": "Required for method=pubkey. Your node ID (UUID from the original bootstrap response).",
            "type": "string"
          }
        },
        "required": [
          "method"
        ],
        "type": "object"
      },
      "name": "fabric_recovery_start"
    }
  ]
}

What the leaf hashes

{"body":"e2ed1f5a9fc1a95aecb679aabb8844508cef277858a31a6ce92d4085a9999dce","id":571417,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793140236446664,"prev":null,"subject":"d6591793-06e6-4421-946c-5ea93eca904c","subject_kind":"endpoint"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-27 (273461 rows).

1. 0xa9d47ce30650c50d0961dbb4f89283bf5358969e009241c4d7ab869e23b68105
2. 0xce670b2670925130e748da0c47ee5508156ef25f7cf1b05914c27e07f7dfd7c5
3. 0xa3a9ebbb9ece75e7e2e07d3ad77d7fe125df14182412263a0acd87081ab0a82a
4. 0x67d22c9f7463969a5334666487916f9bb7948ca24c4cd45cc1e06492ec610fa1
5. 0x549b0a239c74ba2f1db6eaffa8a139a81ba7320199fa7f293ae977c6881bd815
6. 0xf9f0aad56c513f38a0835b5374964c2013004eff4fffacfcbd3ba7e41afb2e9b
7. 0x6fb0bf69a4ea4bca2213f0064ec81d154aa4a10cd79ac762ae836ff95d72867e
8. 0xdb820871489216f2a59cdcbbfae664fb629626fc9282fd566f2e330c2c6da92e
9. 0x9e0cd50bab40589d5c3f7030630dbf089f8dd78283bfa0dab03fb9025ccbc2ca
10. 0x3466d9f1e31dbdede2329b2c4dc10b270dcded0105bcbe659412818a11723341
11. 0x324d1c483a7a3f90b87e666635af8af905bde0bcef0945e9f29ca54a05110160
12. 0x209c5ec9dadef949213746eeb17aaa8b9acf049b484430fc0bc152ee10f2e007
13. 0x5e700087f2a5e8fb7372f2c2db037d66942006d666bb45dd92f745011295fa7b
14. 0x98c6ed3e7b5bb7f1757a8660af410226a11dd563bf83010040c2ce059ab45e54
15. 0xec7bb68216a4deb1960acfbbd75da88f7e468b58adb9cf3ec62f2790e46508b3
16. 0x64c405a28e8819716221eb2529fe4ce277ab08025e17e685cbd5ece75ceb75c7
17. 0xf30fddbf4811226c58e8f0daf36fddd79fc5f1356b592bb1d99a8061ddbabe66
18. 0x2bf8151e5f157dd183b9de6fa00469551932a7a6e3f33a694895000ac9061197
19. 0x9fc354c0ea3efc3f1b6548bb77ea902a50f2c9647647ea61592efce2bd795699

Day root

0xdd77e5e99da32c3f154180d63e3c3e6fe11e896a2c6896412ef6b5c4bcf7e795

Chained

0x23bb4dfd09f55c15ac3962f53578e02c6114d5bfd9bb451cf8794fb6e2817ef4

Published

On Arc Testnet, block 69414147: 0xb2ebd83aafeb765a0ce66e76aefb133ed06606c98038fd56191e2bcd1dcb77b4