Evidence row 425254

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": "2026-10-27T05:01:41.753Z",
    "quality": {
      "l30DaysTotalCalls": 67,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-10-27T05:01:57.157Z"
    },
    "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":"6b047d82a3b5b025037761b4b3aa459b49ceee0b54604b0f366821e854584497","id":425254,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793086108690708,"prev":407458,"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 2026-10-27 (273461 rows).

1. 0xea59fcb2182c7c04f6b6219eec43b6f906e4f88f13281210a481294e3443a581
2. 0x3b6bb3074c722ee7816b714d0ab97a896a1d99876694f5fca68b8c8360ce4657
3. 0x8c744e0448af3eddec2a00e6f5e25418c6252473891ee064a3f623e85e2f8253
4. 0x1cc20869a5eae1cedc5837d3563e948c06eb8b7f6f8bbbc3a4c502f2e92dac47
5. 0x1808fed958937d49a66d6241236860667ff9e045c3a68b0df7e54bf922d5d03b
6. 0x39bf4400de79659442b445f42dc38c288125ef2749876a61fe755f0f68fe108c
7. 0xd989d7d9925f260c5bfed849c5b69c950d1d47b0c82cbc62240aafb03027005b
8. 0x9f09a1804a0eade7618e8dd5b2817d9b4309588b37685b66279acf0b953cf218
9. 0x7ccdf7ff36ebde7df6655ee08c74589be7dba18f5e10f9abba29901ab38aec95
10. 0x18efad64a76eebb9176b156f757703ccaa1d8e00ce45eca065bb985177141909
11. 0x8cc7cdbb404948d6c8277e8104fbf6f6ef7bc67273321adedcf016270a69a84e
12. 0x71d164c799d87b4dc25af672a70aaf73791d8dbb1786a5d4eb3ead269cb7c28a
13. 0x89602081fbcc80aef8908f5df765767a1a41cc8b089111259ea78e6583a8bc4b
14. 0x41f9f462759cb539183e979fb3eb967d94755cf039c44a64a9a3c4ad97523cfd
15. 0x56f7109d4cde42492651beb1237c13cdcbf95e6fee2b2482391a2388e04c4629
16. 0x8745bd887f5ce9f7a49558fd2b04cdcd97a05ea9f8a23f62d0e80cb13d328b0f
17. 0xdf1105afdc109de3c09a98fc8a3864159ad964e6f49b635c105a27a1e1f14310
18. 0x2bf8151e5f157dd183b9de6fa00469551932a7a6e3f33a694895000ac9061197
19. 0x9fc354c0ea3efc3f1b6548bb77ea902a50f2c9647647ea61592efce2bd795699

Day root

0xdd77e5e99da32c3f154180d63e3c3e6fe11e896a2c6896412ef6b5c4bcf7e795

Chained

0x23bb4dfd09f55c15ac3962f53578e02c6114d5bfd9bb451cf8794fb6e2817ef4

Published

On Arc Testnet, block 69414147: 0xb2ebd83aafeb765a0ce66e76aefb133ed06606c98038fd56191e2bcd1dcb77b4