Evidence row 407458

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": 46,
      "l30DaysUniquePayers": 1,
      "lastCalledAt": "2026-10-26T23:24:25.103Z"
    },
    "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":"85b1d61e4a596ad0fd1dd81c6a2f4826be289e6af2945f936ea0bd57a55f8f2c","id":407458,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793080248874351,"prev":298488,"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. 0xcca94525031a4cd2f4cd42f7ff4848ed1a81dee0baecb3d92e30bf77f99d4004
2. 0xdd3d10c22a1cc2834fe4052c6cefed53d520560401e8ff3adcdca0765002c0db
3. 0xc30f7eb86a8c47922af50501c9c05202f4aae00588e4a0b5cd64c766ed46fae4
4. 0x9723b6e7db70b55fdfad7e0270a4b6b08d1af186274d44ec5aa4fd4278983700
5. 0x49cd49a57aa87f0dcead573eb9a6a4c25657d32c71f4ddde858de8e3941c2af9
6. 0x64074d497ed6b2997b5d3bb5de21cd7467063abe67e0755844caa6d58685bf1a
7. 0x7824ec819a7d820ab339524fac5355fc2fe9aba8f0278a68ee252c5483412b69
8. 0xafd4658b4d6f8a90031e87d34cc12b92abe1c874578cd51ee4a69a1f98a6d83c
9. 0xac15dafbec928364e6fbd32eb26e80422c838965fb1805b543360fdf64e1329d
10. 0x6903dfc6a8eef68f78bd5dca209fb04016ed07e4688163fadd127d834549d06e
11. 0x4eb72d2edb3b063d190586d64965ee7a33e28b4ffbc292fb4be0995ba6f8daa5
12. 0x6c0803f2d7123e0bcd2a148e9fde0f429f31dc964ced287e760ee656fcd9912f
13. 0xeb77e9d1884bf470f4a13a5869956a83ac37957112a29ccb9e63ddf7791b5a0b
14. 0xcc49fd573532e5a29f5be4033f62a2eff71456c020bd2258312b98e95cfe301e
15. 0x969cd44e5a4e8dc3110540398fbf689659eb51df735c1cda5d8f021ef9ff5683
16. 0xa94627de1af0e823832e05a9069b304ecccb8c0cdb8f9cfc4f2039bfb9799dc5
17. 0xdf1105afdc109de3c09a98fc8a3864159ad964e6f49b635c105a27a1e1f14310
18. 0x2bf8151e5f157dd183b9de6fa00469551932a7a6e3f33a694895000ac9061197
19. 0x9fc354c0ea3efc3f1b6548bb77ea902a50f2c9647647ea61592efce2bd795699

Day root

0xdd77e5e99da32c3f154180d63e3c3e6fe11e896a2c6896412ef6b5c4bcf7e795

Chained

0x23bb4dfd09f55c15ac3962f53578e02c6114d5bfd9bb451cf8794fb6e2817ef4

Published

On Arc Testnet, block 69414147: 0xb2ebd83aafeb765a0ce66e76aefb133ed06606c98038fd56191e2bcd1dcb77b4