Evidence row 572576

What was observed

{
  "count": 9,
  "tools": [
    {
      "description": "Independently verify a 5arz PoHF JWT: checks the ES256 signature against the live public JWKS and validates expiry/not-before, then returns valid/invalid plus the decoded claims. No API key needed — this is pure cryptographic verification you could also do with any standard JWT library. Accepts either the legacy pohf_jwt / pop_jwt or the standards-conformant sd_jwt_vc (IETF SD-JWT VC, typ dc+sd-jwt).",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "pohf_jwt": {
            "description": "The credential returned by verify_human — the compact JWT, or the sd_jwt_vc string (ends in ~).",
            "type": "string"
          }
        },
        "required": [
          "pohf_jwt"
        ],
        "type": "object"
      },
      "name": "check_credential"
    },
    {
      "description": "Fetch a Proof-of-Human-Fulfillment receipt by attestation id. Returns the signed packet, verifier identifier, JWKS URL, and a how-to-verify hint. Free, no API key — pair it with check_credential to verify the signature yourself.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "attestation_id": {
            "description": "Returned at fulfillment, or in the X-Attestation-Id header on the buy response.",
            "type": "string"
          }
        },
        "required": [
          "attestation_id"
        ],
        "type": "object"
      },
      "name": "get_attestation_receipt"
    },
    {
      "description": "Return the current plan, seals and document checks used this month, and what remains. Requires an API key.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "apiKey": {
            "description": "Optional: pass your key here if your client cannot set the Authorization header.",
            "type": "string"
          }
        },
        "type": "object"
      },
      "name": "get_balance"
    },
    {
      "description": "Return the current Verified-Human-Hour (VHH) index — the benchmark price of one hour of verified human work/attention, in USD. Free, no API key. Useful for pricing verified-human data and as a citable benchmark.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {},
        "type": "object"
      },
      "name": "get_vhh_index"
    },
    {
      "description": "List currently-buyable verified human work tasks. Each task includes its USD price, remaining slots, supported settlement chains, and the kind of Proof-of-Human-Fulfillment receipt issued on completion. Free, no API key.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "limit": {
            "description": "Max tasks to return (default 20, max 100).",
            "type": "number"
          }
        },
        "type": "object"
      },
      "name": "list_verified_human_tasks"
    },
    {
      "description": "Buy one slot of a verified human task. Called without payment it returns an HTTP 402 / x402 challenge with settlement instructions; settle USDC on the offered chain and call again with x_payment and purchase_id to receive an attestation_id — a verifiable Proof-of-Human-Fulfillment receipt. No API key required; the payment is the authentication.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "agent_key_thumb": {
            "description": "Optional RFC 7638 JWK thumbprint of your agent key; embedded in the receipt's cnf.jkt claim.",
            "type": "string"
          },
          "purchase_id": {
            "description": "Purchase id from the previous 402. Required when presenting an x_payment.",
            "type": "string"
          },
          "task_id": {
            "description": "Task id from list_verified_human_tasks.",
            "type": "string"
          },
          "x_payment": {
            "description": "Optional X-PAYMENT settlement proof. Omit to receive the 402 challenge.",
            "type": "string"
          }
        },
        "required": [
          "task_id"
        ],
        "type": "object"
      },
      "name": "purchase_verified_human_task"
    },
    {
      "description": "Create a 5arz API key so your agent can request proof-of-human credentials. Every new key starts on the Free plan — 1,000 credential seals a month and 10 document checks, no card. Pass mode:\"test\" for an unlimited free sandbox key (arz_test_…) whose credentials are marked test:true — never treat test credentials as production proof. The key is shown once; store it.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "contactEmail": {
            "description": "Contact email for the account.",
            "format": "email",
            "type": "string"
          },
          "mode": {
            "default": "live",
            "description": "live for production keys; test for an unlimited free sandbox key.",
            "enum": [
              "live",
              "test"
            ],
            "type": "string"
          },
          "name": {
            "description": "Your company or agent name.",
            "type": "string"
          }
        },
        "required": [
          "name",
          "contactEmail"
        ],
        "type": "object"
      },
      "name": "register_agent"
    },
    {
      "description": "Get a Stripe checkout link for a 5arz plan. Free (1,000 seals/mo, 10 document checks), Starter ($99/mo, 100k seals, $1.25/document check), Growth ($499/mo, 1M seals, $0.75/check), Scale ($2,499/mo, unlimited seals, $0.50/check). SEALS are credential signatures and are effectively free; DOCUMENT CHECKS are the vendor identity verification and are what you are really paying for. Human verification is always free to the human, at any volume. Requires an API key.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "apiKey": {
            "description": "Optional: pass your key here if your client cannot set the Authorization header.",
            "type": "string"
          },
          "plan": {
            "description": "starter=$99/mo, growth=$499/mo, scale=$2,499/mo. See https://5arz.com/pricing.",
            "enum": [
              "starter",
              "growth",
              "scale"
            ],
            "type": "string"
          }
        },
        "required": [
          "plan"
        ],
        "type": "object"
      },
      "name": "subscribe"
    },
    {
      "description": "Mint a signed Proof-of-Human-Fulfillment (PoHF) credential attesting a real, ID-verified, live human performed an action. Provide sessionId to attest work fulfillment, or memberId to attest that an ID-verified human is behind an account (optionally wallet-bound). This does not establish that the person holds only one account — read sybil_checked in the returned claims before gating one-per-person actions. Counts as one seal against your monthly plan allowance (1,000/month on Free; unlimited for test keys). Returns an ES256 JWT that anyone can verify against the public JWKS — pass it to check_credential. Requires an API key (Authorization: Bearer, or the apiKey argument).",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "apiKey": {
            "description": "Optional: pass your key here if your client cannot set the Authorization header.",
            "type": "string"
          },
          "memberId": {
            "description": "Member to attest as an ID-verified, live human (personhood path).",
            "type": "string"
          },
          "sessionId": {
            "description": "Verified session to attest (work-fulfillment path).",
            "type": "string"
          },
          "wallet": {
            "description": "Optional EVM address to bind for on-chain isVerifiedHuman() gating (personhood path).",
            "type": "string"
          },
          "walletNonce": {
            "description": "Optional wallet challenge nonce.",
            "type": "string"
          },
          "walletSig": {
            "description": "Optional EIP-191 personal_sign of the wallet challenge.",
            "type": "string"
          }
        },
        "type": "object"
      },
      "name": "verify_human"
    }
  ]
}

What the leaf hashes

{"body":"fa1067d8806c3d1186bb8fd3882c02cc6fe4a2ab2059f3d06547d593067da1f2","id":572576,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793140798501652,"prev":null,"subject":"dae8b3b6-9dfc-4a04-89ea-fa37008356e9","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. 0xe79df18f8498ea364cc8e9785dfdcd4119802671594452484e5c66b37f676ffc
2. 0x09fee4d2f0626b51690bad3eb20d930d274c0996b66cf69e60ab81b0c5c6cd00
3. 0x62077a466d4431d755cd1eee7fad7ab55a05f983b69c0196cc1d7897f915be1a
4. 0xfa03e2cf193cc3a3cfaadf20669d09b76c8fea253067ea8096552b1586379e4f
5. 0x38d4b3c1814bdd7ad77fb87ec1bbc2e585cf847103ba1560ee199ac88618e63c
6. 0xb79404d1e65c18f8d75f33846a893878a4b17c555ad0e4384a7d4db2b633d3c7
7. 0x9277d23afc2c885c18b1b43d9dca45d654ec94187d4b80616d55cca616346afd
8. 0x6b457c15aeb1b11a8b75e6c455c8ed96cc98330334d5fe69ce11566ab9d08fdf
9. 0x0c929b2b80e2f67e95df5a364d8bbe2bd26441296c231574867f976859f33f79
10. 0xaec5d3351e5604d4e32362929edfac95737668bebf3cee0eb46499b94228ccab
11. 0x71c8691e7266a630f55422792837d4ddf268c83444f68d63c646c42b70b5ded5
12. 0x4f9b484326a98846a2342f967ce1e64ee9fa304288bb4355ab666475eb77b61c
13. 0xab6eb305329046d5ccb835dd8ca955f794e3ca110379a94dbdc780d016448561
14. 0x41f9f462759cb539183e979fb3eb967d94755cf039c44a64a9a3c4ad97523cfd
15. 0x56f7109d4cde42492651beb1237c13cdcbf95e6fee2b2482391a2388e04c4629
16. 0x8745bd887f5ce9f7a49558fd2b04cdcd97a05ea9f8a23f62d0e80cb13d328b0f
17. 0xdf1105afdc109de3c09a98fc8a3864159ad964e6f49b635c105a27a1e1f14310
18. 0x2bf8151e5f157dd183b9de6fa00469551932a7a6e3f33a694895000ac9061197
19. 0x9fc354c0ea3efc3f1b6548bb77ea902a50f2c9647647ea61592efce2bd795699

Day root

0xdd77e5e99da32c3f154180d63e3c3e6fe11e896a2c6896412ef6b5c4bcf7e795

Chained

0x23bb4dfd09f55c15ac3962f53578e02c6114d5bfd9bb451cf8794fb6e2817ef4

Published

On Arc Testnet, block 69414147: 0xb2ebd83aafeb765a0ce66e76aefb133ed06606c98038fd56191e2bcd1dcb77b4