{
  "manageEntity": {
    "action": "Create",
    "entityId": "521902290",
    "entityType": "Track",
    "metadata": "{\"cid\":\"\",\"data\":{\"track_id\":521902290,\"field_visibility\":{\"mood\":true,\"tags\":true,\"genre\":true,\"share\":true,\"play_count\":true,\"remixes\":true},\"genre\":\"Metal\",\"isrc\":null,\"is_unlisted\":false,\"iswc\":null,\"license\":null,\"mood\":\"Cool\",\"is_stream_gated\":false,\"stream_conditions\":null,\"allowed_api_keys\":null,\"is_download_gated\":false,\"download_conditions\":null,\"title\":\"Zeit_Rammstein\",\"duration\":321,\"audio_upload_id\":\"bbbc3f0bedbcf10df21ac7f9cff4d812\",\"track_cid\":\"baeaaaiqseb6laizfrzyimuqdgxr2g23vfy3leijw3mpe4ioyuutizz7zgrqyy\",\"preview_cid\":\"\",\"orig_file_cid\":\"baeaaaiqsed5olmsobyazbuz77zqzxkj4kzq3mh3dxfl6f25ayhcgllvmv4eik\",\"orig_filename\":\"Zeit_Rammstein_320.mp3\",\"is_downloadable\":false,\"is_original_available\":false,\"is_playlist_upload\":false,\"ddex_release_ids\":null,\"ddex_app\":\"\",\"parental_warning_type\":null,\"bpm\":127,\"is_custom_bpm\":false,\"musical_key\":\"G minor\",\"is_custom_musical_key\":false,\"comments_disabled\":false,\"is_scheduled_release\":false,\"owner_id\":308558165,\"audio_analysis_error_count\":0,\"cover_art_sizes\":\"baeaaaiqseawizlxgo2xpaosq7dquk32xgmpr4qjsqytglliel3ik33aadxjf4\"}}",
    "nonce": "0xcd7e07a425033f7a6d07c3d1f042c6f0474ccfb2dc6583bbd1113bb2a70c228b",
    "signature": "0xa3c01fde9bbe7ce4f9d8437dabbb481b8a6c4386ec8b8791b95b85f684bab589552d5e162eca101712adc356af450105fddebb00ae2f9f217b62cced2bd604d21c",
    "signer": "0xa85dce385eaA369F6073e0b6e242561d0870425C",
    "userId": "308558165"
  }
}