Evidence row 2202072

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://construction-calc.x402tookit.com/stair-calc"
    ]
  ],
  "name": "Construction Calculators",
  "owner_address": "0xb531320805c5bed1d46aeadcf4f008fdf172dbda",
  "raw": {
    "accepts": [
      {
        "amount": "20000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
        "scheme": "exact"
      },
      {
        "amount": "20000",
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM",
          "transactionVersions": [
            0
          ]
        },
        "maxTimeoutSeconds": 300,
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "payTo": "DUPiupXtuox38dcGoXUKer5mAydCzmaHjrbQ66qeEm8s",
        "scheme": "exact"
      },
      {
        "amount": "20000",
        "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:137",
        "payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
        "scheme": "exact"
      },
      {
        "amount": "20000",
        "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:42161",
        "payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
        "scheme": "exact"
      }
    ],
    "description": "Stair layout from total rise: number of risers, exact riser height, total run, stringer length, angle and a code check.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "targetRiserIn": 7.5,
              "totalRiseIn": 108,
              "treadDepthIn": 10
            },
            "type": "http"
          },
          "output": {
            "example": {
              "angleDeg": 39.719,
              "asOf": "2026-10-11T14:25:13.933Z",
              "comfortRule": 25.429,
              "comfortRuleOk": false,
              "degraded": false,
              "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
              "issues": [],
              "notChecked": [
                "your local code: limits below are the common US IRC residential ones (max riser 7-3/4 in, min tread 10 in, 3/8 in variation) and other places differ",
                "headroom (about 6 ft 8 in), handrails, guards, landings, nosing and stringer width and size",
                "…2 more"
              ],
              "reasons": [
                "Comfort rule 2 x riser + tread = 25.43 in (outside the 24 to 25 in range often used).",
                "Number of risers = total rise divided by the target riser, rounded; all risers are then equal.",
                "…1 more"
              ],
              "riserHeightIn": 7.71429,
              "risers": 14,
              "source": "computed locally",
              "stringerLengthIn": 169.009,
              "summary": "14 risers of 7.714 in and 13 treads of 10 in: total run 130 in (10.83 ft), stringer about 169.01 in, 39.7 degrees.",
              "totalRunFt": 10.833,
              "totalRunIn": 130,
              "treadDepthIn": 10,
              "treads": 13,
              "verdict": "WITHIN_COMMON_LIMITS"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "properties": {
                    "targetRiserIn": {
                      "description": "Preferred riser height, default 7.5",
                      "type": "number"
                    },
                    "totalRiseIn": {
                      "description": "Floor-to-floor height in inches",
                      "type": "number"
                    },
                    "treadDepthIn": {
                      "description": "Tread depth in inches, default 10",
                      "type": "number"
                    }
                  },
                  "required": [
                    "totalRiseIn"
                  ],
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "angleDeg": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "asOf": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "comfortRule": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "comfortRuleOk": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "degraded": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "disclaimer": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "issues": {
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "notChecked": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "reasons": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "riserHeightIn": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "risers": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "source": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "stringerLengthIn": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "summary": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "totalRunFt": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "totalRunIn": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "treadDepthIn": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "treads": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "verdict": {
                      "type": [
                        "null",
                        "string"
                      ]
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-11-01T22:43:59.547Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-11-01T22:43:59.361Z"
    },
    "resource": "https://construction-calc.x402tookit.com/stair-calc",
    "serviceName": "Construction Calculators",
    "tags": [
      "stairs",
      "stringer",
      "riser",
      "tread",
      "carpentry"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Stair layout from total rise: number of risers, exact riser height, total run, stringer length, angle and a code check."
}

What the leaf hashes

{"body":"80cbb66aca849d85f2c4d4d6d303b971febad90bbf8a0befc770bc498b7aa331","id":2202072,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646812396643,"prev":null,"subject":"x402_bazaar:https://construction-calc.x402tookit.com/stair-calc","subject_kind":"source_record"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-11-02 (444186 rows).

1. 0x66782de82d863dbf34fabac4cb0ee2270c24afdcef08a6f6dc2a8b0e0173086a
2. 0xc98144e4c6f1df63a97319f815461bb7fc20042c38f3e0e88c4b7701e116ad00
3. 0xefaab4fd0feebbc0883218a2477b6682ddd59c4290eab39194a01d32540de238
4. 0x8d9fa5ba6627bb2aade812441cad3cd386bad929ba62fb2420b8bed98a771416
5. 0x4af978833ee2185153a335bf5a4d4b477c3f2328652e877b207ca2d2f8552b98
6. 0xc8dc29740cf5bfb133b5caa4441668f0a34221060436b5613d96937a5cfe75b3
7. 0xb11d4fecc3445b96e620f6005a7af2dd659e0fa16b7b6b15edd2291fa6399217
8. 0xb77ca8e100e904806aface94bd831d2ac800d2bfdcdc607862e341c3d678bc6e
9. 0x4987f5a2323f3db0197d8ef3a6a4a1fc009ccc33babc16d35238358e16e53b53
10. 0x0197b022e7c3d9e10c37d88e008d17fbb73a312c470f5a5571ca803d7cd4de4b
11. 0x5bd5a96f522730cc2d7c83453f529cad4c5355c32378d76ca968a8d0b9548f59
12. 0xafbca494e50a3e802cc29be04745764c359231efd8cff417b639a8de09c4e118
13. 0xc1de5d78ad0d5e6c3608f4aebcde48975d4694ff02af180260cf7b52890d7af1
14. 0xfb5ea8fd7d0c463ff98fdc93228854845802421c0e3865536227edf756498fcd
15. 0x23f4763e8db2efe57fbc28dfc68f2b97b65f54a03425994e68157763af649a50
16. 0x0e5696ae625571c52ddcd8dc09aa6c994b4ab38f2086df20d56f1f01c603e501
17. 0xf9973981f80219d4f00fa9186b40a8144accc0c9875572fb79eaea312a21a187
18. 0x4d205063c881c48edbbb37762a8d3bbb7444d4c42daa882f663a231893d25c35
19. 0x365b161a4b68d750dcc4b3ecce1154a2163c87b08762079428e68f0ebb6a754e

Day root

0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1

Chained

0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2

Published

On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af