Evidence row 72549

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://combinatorics.openverbs.com/v1/permutations"
    ]
  ],
  "name": "Permutations (nPr)",
  "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": "Number of ordered arrangements of r items from n, nPr = n!/(n-r)!. Requires r ≤ n and r ≤ 10000.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "n": "42",
              "r": "42"
            },
            "bodyType": "json",
            "method": "POST",
            "type": "http"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "body": {
                  "additionalProperties": false,
                  "properties": {
                    "n": {
                      "description": "Non-negative integer ≤ 1000000.",
                      "pattern": "^\\d+$",
                      "type": "string"
                    },
                    "r": {
                      "description": "Non-negative integer, r ≤ n.",
                      "pattern": "^\\d+$",
                      "type": "string"
                    }
                  },
                  "required": [
                    "n",
                    "r"
                  ],
                  "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": "2026-10-02T02:02:26.512Z",
    "quality": {
      "l30DaysTotalCalls": 1,
      "l30DaysUniquePayers": 1,
      "lastCalledAt": "2026-10-02T02:02:26.225Z"
    },
    "resource": "https://combinatorics.openverbs.com/v1/permutations",
    "serviceName": "Permutations (nPr)",
    "tags": [
      "permutations npr",
      "compute permutations",
      "ordered arrangements",
      "npr api",
      "permutation count"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Number of ordered arrangements of r items from n, nPr = n!/(n-r)!. Requires r ≤ n and r ≤ 10000."
}

What the leaf hashes

{"body":"1fe7718ec6a97eef112b835f0a7c3b10f758e2111058138aa18c1a15c9f3d241","id":72549,"kind":"listing","method":"baseline/1","observed_us":1793025486200096,"prev":null,"subject":"x402_bazaar:https://combinatorics.openverbs.com/v1/permutations","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. 0x0dd18eb4be911143040e3e6da33893ac6083a1a3e30fb106614c52c4e166f4c4
2. 0x80e8c2b0400c187282f6722ad3682000f339049c6ec135e657ed17e1e17dd1c1
3. 0xf0fb3681541641169e03fd96de91035e991fc759ef74b9eb9e425edb516ac28b
4. 0xebac3ae133158c812b0a42a4980ad50289d44709e6e956479c34efbe16b2306e
5. 0x2eda76e21101609d621492fd99c30ca325a6a0f7102698b2635dd59a445fcee2
6. 0xc25792c07939f195e889bcff26a53cfec4eec70f86a1ba41c85e2e6d7b649be8
7. 0xbdd491dab6de81438ce0be1e99cc4a4f05816b99946c7337992a0528d05a883a
8. 0x2bf9e6c3e76457f7bf0940b3173f7892bf624688aa900d2b147fad3d403a058b
9. 0xb63e377fabcfa8dee525cf16e5292eb4bf823791d7d6cf20cfedff876058ba79
10. 0x6660c80902a0d0eb7e099a74231019f561e7aad745384cd90bc57b2aac09aef3
11. 0xce6314435eaa4c458576d2a1150a919748260a8a10f1eae96b7a8bc75ff32536
12. 0x362683225b724b8d2d652a95968c57a6f4199ed4f2ad60900fc3603492f17520
13. 0x5aefcf9e3d86e125861c0d490079969110eea8fc901ec61531bba10bb58258a1
14. 0xa96bb9408ce00a0d40ddaba8736257dfce76d5478b131d69db1afdf8a824312b
15. 0x7ddc2fead128357f881b63e6c7c26d7fbbb84fca6c7c8e0bbfe386de86ca8d39
16. 0xc6a4d7899a0f442958e26505011190b7cff2483611c1b94eba9043e0ba9ac36e
17. 0x8c756542e482157df0c36464d75c937b845e4423dbbcfad08f0cf8d5a16b9a13
18. 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae