Evidence row 72545

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://combinatorics.openverbs.com/v1/catalan"
    ]
  ],
  "name": "Catalan number",
  "owner_address": "0xb3f4de103f34b99f0da19b4f16d6b53a14c2194a",
  "raw": {
    "accepts": [
      {
        "amount": "4000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0xb3f4de103F34b99f0Da19B4F16D6B53a14C2194A",
        "scheme": "exact"
      }
    ],
    "description": "The n-th Catalan number Cₙ = C(2n, n)/(n+1), counting balanced bracketings, binary trees, and many other structures. Requires n ≤ 10000.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "n": "42"
            },
            "bodyType": "json",
            "method": "POST",
            "type": "http"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "body": {
                  "additionalProperties": false,
                  "properties": {
                    "n": {
                      "description": "Non-negative integer ≤ 10000.",
                      "pattern": "^\\d+$",
                      "type": "string"
                    }
                  },
                  "required": [
                    "n"
                  ],
                  "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"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-10-02T10:29:16.654Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-10-02T10:29:16.365Z"
    },
    "resource": "https://combinatorics.openverbs.com/v1/catalan",
    "serviceName": "Catalan number",
    "tags": [
      "catalan number",
      "compute catalan",
      "balanced bracket count",
      "binary tree count",
      "catalan api"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "The n-th Catalan number Cₙ = C(2n, n)/(n+1), counting balanced bracketings, binary trees, and many other structures. Requires n ≤ 10000."
}

What the leaf hashes

{"body":"17fe9793e3ba5b92bb69d2bb750950d43945b412ec94a2b9a0180bc69f23a89c","id":72545,"kind":"listing","method":"baseline/1","observed_us":1793025486195136,"prev":null,"subject":"x402_bazaar:https://combinatorics.openverbs.com/v1/catalan","subject_kind":"source_record"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-26 (296695 rows).

1. 0xbe70a4e53f743c13d7cb252eb41018b1e0e39486f27469d53af2db2c49e4ea4d
2. 0xcd030ad34f9af0b1ef623838c1195d1b6618f8a936905e610d45a450ed7a15c4
3. 0x0f7be26f8c3a193f0c2608b7f6cc551e19f19ccdfe6dc44e2a4b8b6c70efc53d
4. 0x2e2e4d8c6bbb7bec2fd6e861c92d22eb99fbd0c741067dca3019c61b1a9b680d
5. 0x512a4bdde504ce1ed04d7f34f312c0b605508136a36f292764b03ea39076cbc3
6. 0x18712172d50cdab574fc699e7c722c38f87b0293e843891504f0941327feea7c
7. 0x7962fc6745efdc605345d80bac915890798e9ee6d7748b7b241d55b97e6924ea
8. 0xfe21c3371c5feae86b94e3f787d959035bc78138abeacf6528aaa2e0f8764fdf
9. 0x3d099a7c22d810954fd7b1d778d0e3aa00cd895cb2389d397ae7c71ec73378e0
10. 0x6a746b816cbae6dd852b6174fa370c7d8224f421d42164fa99d1a244739599d1
11. 0x0c2fadf69af6b0b6e19a10cc8f6ddfdff26662d74207cc53dcbcf5abfbdbc8c9
12. 0xa6f71fd6c3a59323bf7c5386a54935b14c555d8c717289cc73700f56d86994cd
13. 0xd5b5bb5812612371a70171b2252d90e95bb0581ea5a3be198122adc8442e4f79
14. 0xf692ce2b0a640ec9f75aa960e5fb1c2c7091a04e24881798735752c19014e519
15. 0x9f68b5e15459cb62b8c0cd4c124fa61c74147b4a5755a200fbecd21a581635d1
16. 0x123ec8bee20ddc55223eeef5a4f4d6c4b6416515adbb911c56759f5cde56e452
17. 0xd0651cb9bc8155eb52b5247d506e74b8a935057dc190ba52091702ac25ed3a40
18. 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae