Evidence row 290402

What was observed

{
  "count": 2,
  "tools": [
    {
      "description": "Paid with x402 (USDC on Base). Writes the SHA-256 hash of a file on-chain; the block time becomes the proof of existence. Compute the hash locally and never send the file. The hash, the filename and the payer address become public and permanent. Without a payment in _meta[\"x402/payment\"] the result is the payment requirement.",
      "inputSchema": {
        "properties": {
          "filename": {
            "description": "Optional name to record with the hash: a-z 0-9 - _ .",
            "maxLength": 128,
            "type": "string"
          },
          "hash": {
            "description": "SHA-256 of the file, 64 hex characters",
            "pattern": "^(0x)?[0-9a-fA-F]{64}$",
            "type": "string"
          }
        },
        "required": [
          "hash"
        ],
        "type": "object"
      },
      "name": "anchor_hash"
    },
    {
      "description": "Free. Look up whether a file hash is anchored on Base and when, or read the proof written by a transaction. Pass `hash` or `tx`. Call it before anchor_hash to avoid paying for a hash that is already anchored.",
      "inputSchema": {
        "properties": {
          "hash": {
            "description": "SHA-256 of the file, 64 hex characters",
            "pattern": "^(0x)?[0-9a-fA-F]{64}$",
            "type": "string"
          },
          "tx": {
            "description": "Transaction hash; use instead of hash",
            "pattern": "^0x[0-9a-fA-F]{64}$",
            "type": "string"
          }
        },
        "type": "object"
      },
      "name": "find_proof"
    }
  ]
}

What the leaf hashes

{"body":"91cf635df592731e5e1371590cf651262dfc6d2262875ed7b2d3fca49c88f1d0","id":290402,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793047226203713,"prev":null,"subject":"e18fb48d-b985-4a75-87f2-64822bb7f02c","subject_kind":"endpoint"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-26 (296695 rows).

1. 0x7e2f1740d29ebc0aa7fa0028e822d2e4da8a614842dd5f110ab0de79c0554486
2. 0x51e01ed2b26ee23616f3a7c15cfc8d05e17495773da84049687374c77eb26ec9
3. 0xa38f8d6ea0698efb78183c8598ace640da152c6e9a6bf87ad3fc9cc3866d92ad
4. 0x01ba375f338dc52184c54a429bc9bfc0d4e01848f4899d299a23197f9c871283
5. 0xb0cfa88144d00150a93cd2cf9c79d1c0b37b052496af3a295669c81c7b4039e5
6. 0x8bd4cbb11bd572066fc7cd277cd960d3780f91a6a0420775d4b0a2636fd15b45
7. 0xaba52bd12028af00935a7f9fa66e67b44ffd94ada40f6afbaa776a571e575472
8. 0x8a1ca1d62fddb69e155a2ff7e858660354e32f1f917fb6b3c6fd5ff45ac1ebc6
9. 0x7d6ff8d99565f9f3d177151c94c94ffb5c789a5608dacd07ddde5b20f0151c26
10. 0x2718d6dca57166b1f1fa238e8a139e4cdbab7b7485a09970fff985d3b3878bfd
11. 0xaf10e841089e5989890dc77ffce42a46564d25ef15f30d1e35bf53a495483ad4
12. 0xab729e4203b650f2a3c15efd6fd44eb2482232373bc1de662fd9d496869eb2d3
13. 0x0bffb634300aa5609bddaa79e8d31d7cde36c0a5a4465472f809b9f5287e40d2
14. 0x7721d38652b6444b18e1193824e50490ade04851ce6221771f6e374c4527d80f
15. 0x15039087bf60ae9b06b756ec3cbc299760e59923a438bbd91e34d105186db0ed
16. 0x2b6e23e3624a1b66e1d2298cfbce99a93ce6b13d24a58112a71802d79c5f7a76
17. 0xd21942ae3214eff88e08ab04884fd4b11958b51af9a0741b7668e2d07a2c56c9
18. 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae