Evidence row 1038626

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://tabularium.matt-3e0.workers.dev/write"
    ]
  ],
  "name": "Tabularium",
  "owner_address": "0x951bd91ad61d2d867f21b54d2f717d8fff4ad28a",
  "raw": {
    "accepts": [
      {
        "amount": "3000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 60,
        "network": "eip155:8453",
        "payTo": "0x951BD91AD61d2D867F21b54D2f717D8FFF4aD28a",
        "scheme": "exact"
      }
    ],
    "description": "Append a value to a private, hash-chained workspace owned by the paying wallet.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "idempotency_key": "retry-7f3a",
              "key": "notes/today",
              "value": "Met the supplier; follow up Friday."
            },
            "bodyType": "json",
            "method": "POST",
            "type": "http"
          },
          "output": {
            "example": {
              "entry": {
                "hash": "<sha256 hex of this entry>",
                "key": "notes/today",
                "op": "write",
                "prev": "<hash of entry 2>",
                "seq": 3,
                "ts": 1790000000000,
                "valueHash": "<sha256 hex of the value>"
              },
              "expiresAt": 1792592000000,
              "head": {
                "hash": "<entry hash>",
                "seq": 3,
                "sig": "<base64 Ed25519 signature over the head>"
              },
              "ok": true,
              "wallet": "0x..."
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "body": {
                  "properties": {
                    "idempotency_key": {
                      "description": "Optional retry id; a repeat returns the original entry",
                      "pattern": "^[A-Za-z0-9._:-]{1,128}$",
                      "type": "string"
                    },
                    "key": {
                      "description": "Key to append under",
                      "pattern": "^[A-Za-z0-9._:/-]{1,128}$",
                      "type": "string"
                    },
                    "value": {
                      "description": "UTF-8 value, up to 64 KB",
                      "maxLength": 65536,
                      "type": "string"
                    }
                  },
                  "required": [
                    "key",
                    "value"
                  ],
                  "type": "object"
                },
                "bodyType": {
                  "enum": [
                    "json",
                    "form-data",
                    "text"
                  ],
                  "type": "string"
                },
                "method": {
                  "enum": [
                    "POST"
                  ],
                  "type": "string"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method",
                "bodyType",
                "body"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-10-29T16:18:24.176Z",
    "quality": {
      "l30DaysTotalCalls": 91,
      "l30DaysUniquePayers": 3,
      "lastCalledAt": "2026-10-29T16:18:23.644Z"
    },
    "resource": "https://tabularium.matt-3e0.workers.dev/write",
    "serviceName": "Tabularium",
    "tags": [
      "agent-memory",
      "storage",
      "verifiable",
      "hash-chain",
      "key-value"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Append a value to a private, hash-chained workspace owned by the paying wallet."
}

What the leaf hashes

{"body":"510708ce67044f5595b50bb2f30e8f01c82e2f69deb45c168a20067529272648","id":1038626,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793298273237595,"prev":751167,"subject":"x402_bazaar:https://tabularium.matt-3e0.workers.dev/write","subject_kind":"source_record"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-29 (242798 rows).

1. 0x9dc644da0340796ab43e6003172b4f3c13a94b28bca582adb037d67a7f4b47fa
2. 0xda861be29b8d827823fda75ea805d9390260b78873d5c1eda66c11343a41907b
3. 0x36f0cc9cb34fa6a59cdf3af47e862787cc5191be5340088a8cbd75144da9543e
4. 0x1b48cac4526cd6ce21fc13f1e9ca72f4f8b4f96e05c76ffb1868e16852e3fd1f
5. 0xd71df482888bafbaf85177f45814a3f6b5090c9f553038eedbae99ab6f8237e1
6. 0x48721e67cfda940a288ff7cb7b0e36d1548de3af7943a474b19a84c1c0e36349
7. 0xc1b36596a015d0522d16300e13793a760782d2e5b46a4bd04588e65123e83c0c
8. 0xe9690dc397cb4505a847b159a81c1185ee37a344a07981d2557236fc6387383c
9. 0x3301e3ec4c7882a85934a83ab815a00652f484a997ac0402411e0b25921d5a3a
10. 0xa0f19835c645bb5bee5750b8d6bf0f2911b685426471c6615826d15c41ce21a4
11. 0x92af1bf8a2c62189ad8a66e282d0ddda72114c468617970bfd245a3b830c2f90
12. 0x92baf29212252c438f8f8c855a3143deac423fa668be5886d1e86d13c47132ec
13. 0xbb0a2c430dc54812e3f6b6c2468d5b94e0ff1143439ee40a935801628b42ca5f
14. 0x96603408ef495fb0a8106bb839ad20e6578c0c0fbded2a9b235438f5985b0f0b
15. 0x4a1f9fe26bf92c291485b5fb33b95d1917a994e417ac0526ccef55ede0a90a4c
16. 0xe38dc587bc010668982bd78025ac33d7326ffc2587f2de00e848da2718907ecf
17. 0xa1fa2e97e71ad6e802f325afd74bb7095901f2060529c9739182a1233f8804bc
18. 0xe01539ac4c9f9cdf265a9e5c6d99c8da11e70ff0c7175fb23e402d33b9d79785

Day root

0xc050555c6b023f2aefb6536efb9f0760b92c30a0d06c572b7daf63db259ea17c

Chained

0x4cde8bae2042512e1bec11650628f0293556311cc4ea74d99ffddf02b671a7d6

Published

On Arc Testnet, block 69753317: 0x9e85c340732f416e431b111fae72f7624870125f7f379af2732eb6c2ba8cf6a1