Evidence row 2201773

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://grades-calc.x402tookit.com/study-time"
    ]
  ],
  "name": "Grades & Study Calc",
  "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": "Weekly study hours from credit hours using the 2 to 3 hours per credit rule, with total weekly workload and a daily plan.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "classDaysStudied": 5,
              "creditHours": 15,
              "hoursPerCredit": 2
            },
            "type": "http"
          },
          "output": {
            "example": {
              "asOf": "2026-10-12T01:53:43.063Z",
              "classHoursPerWeekApprox": 15,
              "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.",
              "hoursPerCredit": 2,
              "jobHoursPerWeek": 0,
              "notChecked": [
                "how demanding your particular courses are",
                "sleep, commuting and family time",
                "…1 more"
              ],
              "reasons": [
                "The total stays within a typical full-time workload."
              ],
              "remainingHoursAfterSleep8h": 67,
              "source": "computed locally (common college guidance: 2 to 3 study hours per credit hour)",
              "studyHoursPerStudyDay": 6,
              "studyHoursPerWeek": 30,
              "summary": "15 credit hours at 2 h each means 30 study hours a week (6 h on each of 5 days); with class the week is 45 hours.",
              "totalHoursPerWeek": 45,
              "verdict": "COMPUTED"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "properties": {
                    "classDaysStudied": {
                      "description": "Days a week you will study (default 5)",
                      "type": "integer"
                    },
                    "creditHours": {
                      "description": "Credit hours you are taking this term (for example 15)",
                      "type": "number"
                    },
                    "hoursPerCredit": {
                      "description": "Study hours per credit hour per week: 2 (default), 3 for hard courses",
                      "type": "number"
                    },
                    "jobHoursPerWeek": {
                      "description": "Paid work hours a week, to show the total load",
                      "type": "number"
                    }
                  },
                  "required": [
                    "creditHours"
                  ],
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "asOf": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "classHoursPerWeekApprox": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "degraded": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "disclaimer": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "hoursPerCredit": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "jobHoursPerWeek": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "notChecked": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "reasons": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "remainingHoursAfterSleep8h": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "source": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "studyHoursPerStudyDay": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "studyHoursPerWeek": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "summary": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "totalHoursPerWeek": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "verdict": {
                      "type": [
                        "null",
                        "string"
                      ]
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-11-01T23:26:39.554Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-11-01T23:26:39.383Z"
    },
    "resource": "https://grades-calc.x402tookit.com/study-time",
    "serviceName": "Grades & Study Calc",
    "tags": [
      "study",
      "college",
      "credit-hours",
      "workload"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Weekly study hours from credit hours using the 2 to 3 hours per credit rule, with total weekly workload and a daily plan."
}

What the leaf hashes

{"body":"3795495384138f50b96f58f6cf61378b73b41197dfbd58ec4ff9804d36a6deca","id":2201773,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646808852684,"prev":null,"subject":"x402_bazaar:https://grades-calc.x402tookit.com/study-time","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. 0x598c70f638afe93ff167fb353ae84cba61dbd166cd3f990b1f74d5a885696fe7
2. 0xe2391ca8503ce9c61bea23cb60950ad7ecdc39442f670ee32fd1e07999a8857d
3. 0xf663068a99154cacc27273132848cc94585de17dd0d0080e0bcf34d39ba05e67
4. 0x8876e101e2414c4af7475f9cd230e4b94ff9f0317b9b99d3aa1a35949d504fb6
5. 0x53bd3b60d26432ef8550009096747ddafbe963202dc6a5958178a60c05b6e41d
6. 0x892eadccc8b07288bece9167a4ec1cbcb9624824862a89aa2fe5c09989df7e7f
7. 0x6d6a406daf347fa77283bfe7fb21401550d24ad9f7b71dc23e66d2c79e0a7033
8. 0x67f232955c134e6bcbd226105f04b95652c7e94d41a33b4a1a258661b37d223e
9. 0x2a47598226f7de8d8a5aac40bc5ee3e1d2320ea7732a9ceb617b0ebc36e3d5c6
10. 0xd9d41db1b11a5e827ef356ce8d489f98bc52ba6626c01a016e9f9caf91657f65
11. 0x9a7b1bbfa6979d86314592b523be63d06fccf30879ca28ed18e82b2848b95d87
12. 0x743965841c5bcd4dc40acce4c5cb3378e8799faf86f86cbff29c65f36826cd7e
13. 0x04a2764875935b38489e204384b26fce2bde25d67ea9c3bfa8dfb815f7d3928e
14. 0x463370b8390b2f93f44023fe6ce3fd4ebff0a7fecb7894dd4f82f8253ec8661f
15. 0x52242d46cadab5f421a6f86c1edc6379b085ae98482fa80904e4a3028c1849a3
16. 0x1068659ec8f2bcf26e4ad39786557a8c45d60e5ebba4fce2fb9962b2c9c59920
17. 0xf9973981f80219d4f00fa9186b40a8144accc0c9875572fb79eaea312a21a187
18. 0x4d205063c881c48edbbb37762a8d3bbb7444d4c42daa882f663a231893d25c35
19. 0x365b161a4b68d750dcc4b3ecce1154a2163c87b08762079428e68f0ebb6a754e

Day root

0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1

Chained

0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2

Published

On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af