Evidence row 1507928

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": "2026-10-31T12:37:16.832Z",
    "quality": {
      "l30DaysTotalCalls": 95,
      "l30DaysUniquePayers": 5,
      "lastCalledAt": "2026-10-31T00:39:22.55Z"
    },
    "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":"6b677088366dfe1fb816f9541b22cc2dba602eaa1495fac64f0c216f90c47ebc","id":1507928,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793472705832817,"prev":1038626,"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 2026-10-31 (246033 rows).

1. 0x26caa67681d9df5aa3eef419992bb7b59718157ec0c3e8766f5ca4e1408ca00b
2. 0xabc9596532aa5fedc04b973cff02d6b335ea1f6471a5c4d6cbee77108a497f2d
3. 0xd414a012c03950400de1f0317074a2fb4c5096c626693c528a8087e3d22d330f
4. 0x807be1d918089d958bc3e107c1ace99bedd49fc263c8d7a2adac3eb387631dc8
5. 0xde0844e8dd25e6efc849490946d2b96bdcfad84de56f557098d9b3fb4f455e55
6. 0xdebd796514134b9be635fb23e24f31ba835380df3aa38bf5f76aca4da1d72221
7. 0xac4c9f2787741c8576ae71891439ccf74f15190403f22e862338d0a9c72243ba
8. 0xbbcaff292f7807e9d8a121cd66886af6a69440de94cca2387e636803abea3b85
9. 0x699f5088ecd287e3d88c2667688c441a61d298f057bf5b7fa131ce8bd98fff53
10. 0xc7d943a4fa4f51a399419d4dcb0c7686438984a2b30bfc7f207d4203c74c64c1
11. 0x3e3d659ff4f984c4d742c46330107160ab516c836577a1ac459117e1455f228a
12. 0x078aedc0122c8949e6b4016cd8db4fab2fafd794b31231da0b5cf691357423dd
13. 0xc1d42bd41f31c4145761729cf7217fc151a6aac475bc16f1703df71687d831de
14. 0x4c7bf6d7d7c379b3c87447200f991359af0970fc33642e540cd6032a5a5b24f6
15. 0x5212e7c531721a66b1d21d8222c94df019d60ce8150c25bfebe2e6eb1dd39726
16. 0x24ea73817c2ff07f87a42be89aff36ac5fe49b64420a647cd406ee60e6a77f70
17. 0x37f13582abb3c002d51c2f190c312129cbc3a39754618fee2c75c2441bb1eb94
18. 0x59f83f7228f07febe2780660e422e171b0359b8aa031ee3be07e991118130c15

Day root

0x24463725d1c0d9894bd6123691d532547aaa79f0762c0e45aa6a68acf1fd71ab

Chained

0x7d4824ff313dee7252a46f9d5c37b452851deb6c9f24a40c2f74ee0e53c82980

Published

On Arc Testnet, block 70093156: 0xedb7b832f4ebf6781b5ecd2ed241c435b862f4d3761541fa31adc1831b8c44a0