{
  "manageEntity": {
    "action": "Create",
    "entityId": "449062880",
    "entityType": "Track",
    "metadata": "{\"cid\":\"\",\"data\":{\"track_id\":449062880,\"field_visibility\":{\"mood\":true,\"tags\":true,\"genre\":true,\"share\":false,\"play_count\":false,\"remixes\":true},\"genre\":\"Audiobooks\",\"isrc\":null,\"is_unlisted\":true,\"iswc\":null,\"license\":null,\"is_stream_gated\":false,\"stream_conditions\":null,\"is_download_gated\":false,\"download_conditions\":null,\"title\":\"9781442329805_Unit_12\",\"duration\":1671,\"audio_upload_id\":\"c99f22bbe4f1e39f4cf562dcbacbf535\",\"track_cid\":\"baeaaaiqseatbbkz6wdgs6ghlssajwsqfy44libglfiej6ramclg23pjpptnr2\",\"preview_cid\":\"\",\"orig_file_cid\":\"baeaaaiqsec7juucbtehyd776zliza4fco4g5fpryaepjb6z6d6hwpmmea6lzy\",\"orig_filename\":\"9781442329805_Unit_12.mp3\",\"is_downloadable\":false,\"is_original_available\":false,\"is_playlist_upload\":true,\"ddex_release_ids\":null,\"ddex_app\":\"\",\"parental_warning_type\":null,\"bpm\":160,\"is_custom_bpm\":false,\"musical_key\":\"D minor\",\"is_custom_musical_key\":false,\"comments_disabled\":false,\"is_scheduled_release\":false,\"owner_id\":120826721,\"audio_analysis_error_count\":0,\"cover_art_sizes\":\"baeaaaiqsebywt65kqbd75ep3nb5d6mzv27noeiskdc54a3tgw5kf5u6hle3ic\"}}",
    "nonce": "0x92a75c63c0b9458bc0293a61325093c4cdaba3fa52ac61c09a79882ecf04dd9c",
    "signature": "0x1af81bcaa1b3439720e0b203eaa7a451beaec64eee2f5f9b9a8ff65d82afd4092ec7b56c92f5e8524ed0b37e68f5d204febd90123c997842d0344e44c5adf3db1c",
    "signer": "0x44372f1010E4CC58A32eC42c0761e4E659De0941",
    "userId": "120826721"
  }
}