Evidence row 123599

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://usaref.dev/v1/answers/income-tax"
    ]
  ],
  "name": "Usaref - N America reference",
  "owner_address": "0x1f0409ccd20a2fb497d4decef4e17e9d0688fea6",
  "raw": {
    "accepts": [
      {
        "amount": "20000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0x1F0409ccD20A2fb497d4DeCeF4E17e9d0688FeA6",
        "scheme": "exact"
      }
    ],
    "description": "Statutory income tax on a taxable-income figure: per-bracket workings, effective + marginal rate",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "country": "ca",
              "taxable_income": 5000000
            },
            "bodyType": "json",
            "method": "POST",
            "type": "http"
          },
          "output": {
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "body": {
                  "properties": {
                    "country": {
                      "description": "ISO country code",
                      "enum": [
                        "bs",
                        "ca",
                        "cr",
                        "do",
                        "gt",
                        "hn",
                        "mx",
                        "pa",
                        "sv",
                        "us"
                      ],
                      "type": "string"
                    },
                    "receipt": {
                      "description": "Optional. true adds an Ed25519 answer receipt on a paid 200, included in this price. Not a certified extract.",
                      "type": "boolean"
                    },
                    "taxable_income": {
                      "description": "Taxable income in the country's local currency, in the schedule's own period basis (annual for most, monthly for CI/UG/ET/CR). NOT gross pay — reliefs are applied before this.",
                      "type": "number"
                    }
                  },
                  "required": [
                    "country",
                    "taxable_income"
                  ],
                  "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": {
                  "properties": {
                    "breakdown": {
                      "description": "Per-bracket workings: band, rate, taxable-in-band, tax",
                      "type": "array"
                    },
                    "disclaimer": {
                      "type": "string"
                    },
                    "effective_rate": {
                      "type": "number"
                    },
                    "marginal_rate": {
                      "type": "number"
                    },
                    "net_of_tax": {
                      "type": "number"
                    },
                    "provenance": {
                      "description": "The statutory instrument the answer rests on: effective_from, last_confirmed, official source URL, notes",
                      "type": "object"
                    },
                    "receipt": {
                      "description": "Only when receipt=true on a paid 200. kind answer_receipt. Verify at /certified/public-key.",
                      "type": "object"
                    },
                    "scope_note": {
                      "description": "Explicit boundary: this is tax on taxable income, NOT net take-home (reliefs + social security excluded)",
                      "type": "string"
                    },
                    "status": {
                      "type": "string"
                    },
                    "tax": {
                      "description": "Statutory income tax on the taxable income",
                      "type": "number"
                    },
                    "tax_unit": {
                      "description": "Present for UVT/UTA/UIT/BPC schedules — the unit's currency value used to scale the bands",
                      "type": "object"
                    }
                  },
                  "required": [
                    "status",
                    "tax",
                    "effective_rate",
                    "breakdown"
                  ],
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "iconUrl": "https://res.cloudinary.com/bdb-prod/image/upload/c_fill,ar_1:1,w_256,h_256,f_auto,q_auto/v1791989458/bazaar-icons/f7fc99e5e62a5464.png",
    "lastUpdated": "2026-10-19T18:46:55.208Z",
    "quality": {
      "l30DaysTotalCalls": 5,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-10-19T18:46:53.772Z"
    },
    "resource": "https://usaref.dev/v1/answers/income-tax",
    "serviceName": "Usaref - N America reference",
    "tags": [
      "income-tax",
      "tax",
      "north-america"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Statutory income tax on a taxable-income figure: per-bracket workings, effective + marginal rate"
}

What the leaf hashes

{"body":"d878d73cd47b6a172d0802ee4246155308c840470d1a12d7a30937cdf1f53357","id":123599,"kind":"listing","method":"baseline/1","observed_us":1793025623364748,"prev":null,"subject":"x402_bazaar:https://usaref.dev/v1/answers/income-tax","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. 0x592832e87b1a5ae555ac8aa1353d5671b32ea4660b449a2aab75002d4da9dbde
2. 0xe43b7944a9d9e04fa724b6cf152cc6f74d560f0aa98bb135de4733c4011c4b78
3. 0x1a4c11a505f66baf96d634d8b21dc441f2ae3dd3458978d103c209ee3c467500
4. 0x70c1a06e0e39e15aa802fe286f749bb4f80120896f71a4bc0ffa75db2d654289
5. 0xd9f7aa0119a52d4d3ce41815c9d19151f5131df6408f9b0eb3a2cfea7572c3e2
6. 0x9a24ea4a071623e296859192e968ce1a63fc7749bbbc61d635f5f5a5da613674
7. 0xb46db318a7e8611131c2c03e8bdb36c60e3da160d92f364252ae01e4ea1bb334
8. 0xf87a7ec64783cfb91dd7204aab49f00f0b7add530c66c442337a9431d3e2e337
9. 0xd446fb8a293ef659909ea01ca759b213fcef3b2391af4ad20116c641340e19e2
10. 0x299a3ff4761c07d1cb4987908783634f7b9e00f8f10a005c2d99c16a74924a4f
11. 0x049f39c56b6b9cf95e0d9ebf2081f54ac35b4d69ec211e8498958f47d088b46c
12. 0xf522fa92d4115c2b18b96aa43119f8df9b4e96c92f5d6449d0fe96dcd4bf324c
13. 0xc8abb13c711b67d9f1ef145286ed450a0f5566f054a4b290ea3d711873bcbe20
14. 0x5cdeb4648502e0633d01cc4f3379d48cccb9d4f528565b2868eb93db0df9e829
15. 0x7726154b91b2ad65b13849ef6cb6443b1f0ff113a3089c9bd5f2bcfc16be099d
16. 0x47b89901b0f07938a6b9a66ddf35683903f79d756a7c7763665fd632758b08d0
17. 0x9a83be955a206deb65b995adfd92c58fa31c95fbbf926bd199d300e70b08b26d
18. 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae