> ## Documentation Index
> Fetch the complete documentation index at: https://chart-spec.enchor.us/llms.txt
> Use this file to discover all available pages before exploring further.

# CompetitiveTrackHash

## Properties

| Property | Modifier | Type | Description |
| - | - | - | - |
|  `btrack` | `readonly` | `Uint8Array`\<`ArrayBufferLike`> \| `null` | The track's `CHNF/20260801` BTrack, which `trackHash` is derived from; `null` unless asked for. |
|  `difficulty` | `readonly` | `"expert"` \| `"hard"` \| `"medium"` \| `"easy"` | - |
|  `durationMs` | `readonly` | `number` | - |
|  `instrument` | `readonly` | \| `"guitar"` \| `"guitarcoop"` \| `"rhythm"` \| `"bass"` \| `"drums"` \| `"keys"` \| `"guitarghl"` \| `"guitarcoopghl"` \| `"rhythmghl"` \| `"bassghl"` \| `"keysghl"` | - |
|  `trackHash` | `readonly` | `string` | The canonical TrackHash, as unpadded base64url. |


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