{
  "manageEntity": {
    "action": "Create",
    "entityId": "504971474",
    "entityType": "Track",
    "metadata": "{\"cid\":\"\",\"data\":{\"track_id\":504971474,\"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,\"mood\":\"Easygoing\",\"is_stream_gated\":false,\"stream_conditions\":null,\"is_download_gated\":false,\"download_conditions\":null,\"tags\":\"20101106\",\"title\":\"조민준 LIVE 애국가 2010\",\"duration\":62,\"audio_upload_id\":\"f3534b48b4f289e3314b01c83f9b049f\",\"track_cid\":\"baeaaaiqsedtxvwq4fpecrvfmhx3a35yuyffn2cc5cfoqolr2kvcid5ismioyi\",\"preview_cid\":\"\",\"orig_file_cid\":\"baeaaaiqsecudqlsuczk4l4urryhlj5tccd5yirj5zwjsfvndfnz23bnwwerja\",\"orig_filename\":\"14-7_국기에_대한_경례(무전주_애국가).mp3\",\"is_downloadable\":false,\"is_original_available\":false,\"is_playlist_upload\":false,\"ddex_release_ids\":null,\"ddex_app\":\"\",\"parental_warning_type\":null,\"bpm\":126,\"is_custom_bpm\":false,\"musical_key\":\"E major\",\"is_custom_musical_key\":false,\"comments_disabled\":false,\"is_scheduled_release\":false,\"owner_id\":734659738,\"audio_analysis_error_count\":0,\"cover_art_sizes\":\"baeaaaiqsecy6vpnehrnigemecjogk6eenqh4sglq7xhgwahkh4q2uymnmitia\"}}",
    "nonce": "0x15c2b306c52d32e524efae1fbbaac99774eef9d4b5369b2dddb774f6db28945a",
    "signature": "0xe5deb1fcd986974113463089aab8878d28081aacc05a66a443237d233bea8d3717bedb591fc5e17af1296095c5c72facf6c83fa789a4ed9dfdbbc264afbffeb21c",
    "signer": "0x5440c29276C58761A1C9fac1CF686DACF3AF49b0",
    "userId": "734659738"
  }
}