{
  "manageEntity": {
    "action": "Create",
    "entityId": "249207786",
    "entityType": "Track",
    "metadata": "{\"cid\":\"\",\"data\":{\"track_id\":249207786,\"description\":\"\",\"field_visibility\":{\"mood\":true,\"tags\":true,\"genre\":true,\"share\":true,\"play_count\":true,\"remixes\":true},\"genre\":\"Electronic\",\"isrc\":\"\",\"is_unlisted\":false,\"iswc\":\"\",\"license\":null,\"is_stream_gated\":false,\"stream_conditions\":null,\"is_download_gated\":false,\"download_conditions\":null,\"tags\":\"\",\"title\":\"CM_301 - 飛向宇宙  Полёт в космос  Fly to the Universe  [中文]\",\"duration\":290,\"audio_upload_id\":\"4a9e8f5cdfd2614054a5c6313c263fcd\",\"track_cid\":\"baeaaaiqsebgzggxasfmri3ohwzayqrzfmzqvasg2u2wjqki4fa4vs42nxpc2y\",\"preview_cid\":\"\",\"orig_file_cid\":\"baeaaaiqseaujzkw5vmewgdobn5i7rss2rogrcj5axfvtayjodwzkngnxhc6lo\",\"orig_filename\":\"CM_301 - 飛向宇宙  Полёт в космос  Fly to the Universe  [中文].wav\",\"is_downloadable\":false,\"is_original_available\":false,\"is_playlist_upload\":false,\"ddex_release_ids\":null,\"ddex_app\":\"\",\"parental_warning_type\":null,\"bpm\":121,\"is_custom_bpm\":false,\"musical_key\":\"F major\",\"is_custom_musical_key\":false,\"comments_disabled\":false,\"is_scheduled_release\":false,\"owner_id\":610888861,\"audio_analysis_error_count\":0,\"cover_art_sizes\":\"baeaaaiqseagclxhqvilvupfvtx4dsprarvcp34kwohg37eyowrj3kmwe4gu5e\"}}",
    "nonce": "0xc499196bc6afa94f6f1fd89a2dfdb8678e4776c2577a99829bf6f665030ab570",
    "signature": "0xed765cfc26cbb8ae3a5ecae9d5e8dc950011e602262f27eb26ce9a119488233f2e8c1900cd666e00a7148b4d8ae620db8613bf15027621430f56cae0d9bf02031b",
    "signer": "0xf5BfE006B204417a4a7D6B64C2336EEE309eCc17",
    "userId": "610888861"
  }
}