Evidence row 2201548

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://music-theory.x402tookit.com/chord"
    ]
  ],
  "name": "Music Theory",
  "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": "Spell a chord from its symbol (Cmaj7, F#m7b5, G7b9, Dsus4, C/E): notes, intervals, semitones and MIDI numbers.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "symbol": "Cmaj7"
            },
            "type": "http"
          },
          "output": {
            "example": {
              "asOf": "2026-10-11T14:26:13.222Z",
              "bass": null,
              "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.",
              "intervals": [
                "1",
                "3",
                "…2 more"
              ],
              "inversion": 0,
              "midiRootOctave4": [
                60,
                64
              ],
              "modifications": [],
              "notChecked": [
                "voicings and inversions beyond the slash bass you typed",
                "alternative names for the same chord",
                "…1 more"
              ],
              "notes": [
                "C",
                "E",
                "…2 more"
              ],
              "quality": "major 7th",
              "reasons": [
                "Spelled from the root with each degree on its own letter name; MIDI numbers stack the chord upward from the root in octave 4."
              ],
              "root": "C",
              "semitonesFromRoot": [
                0,
                4
              ],
              "source": "computed locally",
              "summary": "Cmaj7 (major 7th): C E G B.",
              "symbol": "Cmaj7",
              "verdict": "SPELLED"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "properties": {
                    "symbol": {
                      "description": "Chord symbol: C, Am7, Bbmaj7, F#m7b5, G7b9, Cadd9, Dsus4, C/E",
                      "type": "string"
                    }
                  },
                  "required": [
                    "symbol"
                  ],
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "asOf": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "bass": {},
                    "degraded": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "disclaimer": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "intervals": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "inversion": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "midiRootOctave4": {
                      "items": {
                        "type": "number"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "modifications": {
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "notChecked": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "notes": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "quality": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "reasons": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "root": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "semitonesFromRoot": {
                      "items": {
                        "type": "number"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "source": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "summary": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "symbol": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "verdict": {
                      "type": [
                        "null",
                        "string"
                      ]
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-11-01T23:39:33.758Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-11-01T23:39:33.476Z"
    },
    "resource": "https://music-theory.x402tookit.com/chord",
    "serviceName": "Music Theory",
    "tags": [
      "music",
      "chords",
      "harmony",
      "theory"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Spell a chord from its symbol (Cmaj7, F#m7b5, G7b9, Dsus4, C/E): notes, intervals, semitones and MIDI numbers."
}

What the leaf hashes

{"body":"5c1fe604aa35735b1b129b4997755e6c7508e4eb11f3d4d1a5a40cbb8508adcf","id":2201548,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646806616630,"prev":null,"subject":"x402_bazaar:https://music-theory.x402tookit.com/chord","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. 0x165aa2da2d1db09b8e1740ae7448641490511ec9222036fdcdbda31b6b5b5f92
2. 0x8773d106bf13af876a786e2be6620df47704fa2faec83342c56db9d64512108a
3. 0x450435a293e89697bd9507012e3555c7fb06daeadc1fbf95b8a653a896eac40c
4. 0x3c18399210738fef95df7e87cde2c46f2891e4ca3ca93ddecfbf034ca2e7b805
5. 0x5fa59179adf6039106cd37118fefe742eb9cf8fec3c2bb0fe0027f9cd1afaefa
6. 0x3559f0abb4a64475bf9fc5c20fa37858a1b8e9e5e04ade4549416d58d1e70e93
7. 0x9c8be84c32f02917e3213b34cab6e339139e192ab7bc07fa1980a3bbacdcd02f
8. 0x2b2f945f1f69edb02a797c734250ff445fb5c60614735422251eb79188e92531
9. 0x97f244ca21b101ab5a18f5df26c2cc02af82ef9758fef66900ec562e6b655b20
10. 0x1f582c35ae0505afe6139a627572289f34aa62d2ca1f404bed36f5d7d819f427
11. 0x09a0308be148dd9c435d029c4870156cf50430143848aa84134844ccc95dd81a
12. 0x29be3b4bc5c51b5da3d3a47abd9ef1ece21fc6515a9b343d9bb205b2bd4f3e0a
13. 0xac2edb456c581283e2c60a03e146bbba52ffbe8a277ea7e858384f30bbc24d54
14. 0xd35a6b56332d7bee4b13ce3efea77dd0a6863016f58691fb78e2e2faf7ab8e87
15. 0xb6470417fdb2a0e3de9c1abb1722cbc88bc0dfb5afda0a77e1eac26ab1683ece
16. 0xac40f077ca4be8c3432a67771725cc315e8101fc2649999cfad2c900a7640e27
17. 0x53a741b69e9e51c4a288a74712aa6ac3fb28c8923cd3e6461d161c4f2d48b31a
18. 0x050f2978b537f7afb21ee1551577cdf146d1c56f4df12d24315ae5e69366b0a4
19. 0x365b161a4b68d750dcc4b3ecce1154a2163c87b08762079428e68f0ebb6a754e

Day root

0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1

Chained

0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2

Published

On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af