Evidence row 3064996

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": "Agent memory: save a value under a key in a persistent key-value store owned by the paying wallet. The first write opens a 30-day workspace. Memory survives restarts, new machines and hand-offs between agents. Every write is hash-chained and signed (Ed25519), so the history verifies offline. Values up to 64 KB; failed writes are not charged.",
    "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": "2026-11-04T01:01:34.332Z",
    "quality": {
      "l30DaysTotalCalls": 103,
      "l30DaysUniquePayers": 8,
      "lastCalledAt": "2026-11-04T01:01:33.971Z"
    },
    "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": "Agent memory: save a value under a key in a persistent key-value store owned by the paying wallet. The first write opens a 30-day workspace. Memory survives restarts, new machines and hand-offs between agents. Every write is hash-chained and signed (Ed25519), so the history verifies offline. Values up to 64 KB; failed writes are not charged."
}

What the leaf hashes

{"body":"765262aa6ece3696a5014a1844ab8e1f8190f14e0d9045afd62b884bee143c85","id":3064996,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793822235597529,"prev":2633334,"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 2026-11-04 (424109 rows).

1. 0xc9674984e96e72f712277a99e2b4bbd215aa4e717326b5cc0a45b56b02b94007
2. 0x21acad743d18fe75320af5d1167978701d467b47968aac0c540b468c1bae7102
3. 0x929a78ba1679a7e8659a5f78f93608837cfc23285dfca93d0bd810de74b3d4d7
4. 0x64c5441aafc36970e14a55df97dd9fc1aa5ca6d25ec1d43952f68c83bb6d862d
5. 0x4897b2c3c30ddfacd6be5932aabebcdb999d50a85117fa50101dfea0edc03322
6. 0x10b00f644ac6881d6f0c35afea015357ecb84b528324d77b4bde1d6654ac3731
7. 0xa2df7b0073d1ce7be1e2a22df25f51ba5401519d1866202fecb1a8345a6946c6
8. 0x46ba328e97af6f66170fd3de8e95d26854afc8a1f6e97c117c848a1d02d546da
9. 0x094fe5d6f3318aa55b38535a69dd5aa49118364e5b96e8648a22fff7de8e5016
10. 0xc5377a7efe5893ade904dfbace8dc1c62135b951702d00ead23cd3f849807378
11. 0xa1382de4934aa532d7aa873379dbdb974b579bef0a3e7fcb1118323f8ffb5bd0
12. 0x6aaa2a689c83ead51ff3e19f515aea8059782b585ddf1f95d3887b3a6ea2f5de
13. 0x47b695342d1ff603ef448d2b6064dad9c6bc657dc08e80d74a4638d529397425
14. 0x90012fcf29099b73d24dc68936adf2b2365bf0be4f4ecef52e4c03a41113ab4a
15. 0x90983442ab42e700d20428d242c4145406c7d45f3761d2e64f4fe48376715c6a
16. 0x1ea547989ac488dff8da9e79b0ab4cffe98cb60fb4c76ae15e4a1f53a247e0be
17. 0x7efb735f8d49bcac59a20b148718d382f32a05352c0255ebbd501ca73055453d
18. 0x9c1c771179da4a002386557e8601b2d4983c3e366808477ee20da18c282c1dd8
19. 0xbb1998892a86d9633ea7b5de06760114b45777da649c217062ff0d65d7095f34

Day root

0xd4eed8c0ea3c90ec6f262b19fcc3b849f30cb82a0f84b8b89569e48af7d0c1ee

Chained

0x59305749c32724a02a23c368834d8a36ae9908da93a915e2962fffe01b4e591b

Published

On Arc Testnet, block 70772483: 0x813d56041c1efd407e56047129b597b154a1cb26458bb2768fd0a4630ac97345