Evidence row 2201549

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://music-theory.x402tookit.com/chord-name"
    ]
  ],
  "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": "Name a chord from its notes (C E G Bb, A C E G): best name, inversion and alternative names; first note is the bass.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "notes": "A C E G"
            },
            "type": "http"
          },
          "output": {
            "example": {
              "alternatives": [
                "C6/A"
              ],
              "asOf": "2026-10-11T14:26:12.958Z",
              "bass": "A",
              "best": "Am7",
              "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.",
              "inversion": 0,
              "notChecked": [
                "chords outside the 28 templates (clusters, polychords, altered dominants beyond b9 and #9)",
                "notes spelled differently from the intended root (the spelling of the note you give is used)",
                "…1 more"
              ],
              "pitchClasses": [
                0,
                4
              ],
              "quality": "m7",
              "reasons": [
                "The first note you gave is taken as the bass; a name whose root equals the bass is preferred.",
                "The same notes can be read from different roots (symmetrical or shared sets); context decides."
              ],
              "root": "A",
              "rootPosition": true,
              "source": "computed locally",
              "summary": "Am7; 1 other reading: C6/A.",
              "verdict": "AMBIGUOUS"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "properties": {
                    "notes": {
                      "description": "Notes separated by spaces or commas, lowest first: E G C or A C E G",
                      "type": "string"
                    }
                  },
                  "required": [
                    "notes"
                  ],
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "alternatives": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "asOf": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "bass": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "best": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "degraded": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "disclaimer": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "inversion": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "notChecked": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "pitchClasses": {
                      "items": {
                        "type": "number"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "quality": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "reasons": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "root": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "rootPosition": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "source": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "summary": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "verdict": {
                      "type": [
                        "null",
                        "string"
                      ]
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-11-01T23:39:30.664Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-11-01T23:39:30.344Z"
    },
    "resource": "https://music-theory.x402tookit.com/chord-name",
    "serviceName": "Music Theory",
    "tags": [
      "music",
      "chords",
      "harmony",
      "identify"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Name a chord from its notes (C E G Bb, A C E G): best name, inversion and alternative names; first note is the bass."
}

What the leaf hashes

{"body":"660468a1a0628d7fa6673606e079cea757aa4cf6f4c4a284f5080abf9cd23483","id":2201549,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646806620151,"prev":null,"subject":"x402_bazaar:https://music-theory.x402tookit.com/chord-name","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. 0xc208ecd7213ccba96a54691a4356b519399e485234c2e9308297ce05029489b3
2. 0x5656b8f351202879abfddae933bb5b2d67e7110c5a6b8c6a494dabcb49bfb6e1
3. 0x74f0654027a36563ff38d2e541b44d7c436934359359437d7b3670a703b5a457
4. 0x1f518a3131097d2fb775d1f7684a03a361f8b5b4a25777b5037dac9169dbf6a8
5. 0x8273f61146f55739a764355ba01181aafd6a237d268197c144d396a6bf65ad0c
6. 0xb58be61078ee8e7243a58e606513316b9976f59871a80f0e4bd5d922ec897be3
7. 0xce8f48b843a73302b8ca3ecb9b79ce58ffdc39454bf91d7009fca5cd20c3dd5a
8. 0x31ab5dc9995dc6d067682082b4380dcac735dced832cd2c206153c5e79eb9453
9. 0x8b49628896c7ed442568a40958310853b06c5b7ecf54cd733ae58cde2619d11a
10. 0x5bd717f6cf0ac41acdc06eccc61cd619f22178158a375370e7a99d8b2a5e37f6
11. 0x8551dbb665117270fe6d547f823354cb1f33f877d36defe3b31cc7b120e917ce
12. 0x7ad018da9217f00e9553ad7f613d19ec65a84c3a339588527c8b35c90d6567b4
13. 0xd7f4adbe11763ae678ef4c51fd1fa9ddf52bf60add48464d376475766e9accfe
14. 0x0b45a0435ea40bcbc48c2b318e8c62aa48a7e6b10e52b4548ada394225a7bd9f
15. 0xcbfaf790331071a9b3499a4db6f9d951fe5d04baefda2c66846b52b023ab8ae5
16. 0x37d31d28d0bd3743650d57e9fbf999efa4592cac831267f83aa125335b35a16b
17. 0xdb8bd933619a267f9790faac9839143d202be46af284371cc369cdf683f897ba
18. 0x98cbbf2c68ab4c0b4db782aeb88bea1f30b02178cf8b5d3d24a931d19492ea6d
19. 0x252cce55f1a3d5391c16f82d7f62494429a5f69b03486d4cfcfb7b2c96d6c884

Day root

0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1

Chained

0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2

Published

On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af