{
  "manageEntity": {
    "action": "Create",
    "entityId": "736278675",
    "entityType": "Track",
    "metadata": "{\"cid\":\"\",\"data\":{\"track_id\":736278675,\"description\":\"\",\"field_visibility\":{\"mood\":true,\"tags\":true,\"genre\":true,\"share\":true,\"play_count\":true,\"remixes\":true},\"genre\":\"Pop\",\"isrc\":\"\",\"is_unlisted\":false,\"iswc\":\"\",\"license\":null,\"is_stream_gated\":false,\"stream_conditions\":null,\"allowed_api_keys\":null,\"is_download_gated\":false,\"download_conditions\":null,\"tags\":\"\",\"title\":\"フラワーフラワー\",\"duration\":149,\"audio_upload_id\":\"f605005c10a2bfd89c46b61154c6bf4c\",\"track_cid\":\"baeaaaiqseaazhqq66wewjcxj4kv4j2zk4pqtjnwqg3gvbllvgc5qlykh3zuzu\",\"preview_cid\":\"\",\"orig_file_cid\":\"baeaaaiqsebimtseku7sr2y46qljr4nfhu6ah6m3znwsnsr4ocusa54hbnevck\",\"orig_filename\":\"☆ぱっぱっ花ロク.mp3\",\"is_downloadable\":false,\"is_original_available\":false,\"is_playlist_upload\":false,\"ddex_release_ids\":null,\"ddex_app\":\"\",\"parental_warning_type\":null,\"bpm\":113,\"is_custom_bpm\":false,\"musical_key\":\"D major\",\"is_custom_musical_key\":false,\"comments_disabled\":false,\"is_scheduled_release\":false,\"owner_id\":392916338,\"audio_analysis_error_count\":0,\"cover_art_sizes\":\"baeaaaiqsecukdhaixp4ey7c3zyzqycsuwv6ddlur3f5t4yem7atfe7ahpe4oi\"}}",
    "nonce": "0x1676ef9902dd03aa0c48c5646e70dff91d0e9562576dda3becacfbf88970b8e2",
    "signature": "0x5a0905d2c9953246e7e5ef2fab86cf75675ea6dc7df7ea254c6999d4bef99cf543138601fb9f4f7b226fc8758502e17087c7b9820194846face4bdd274681d651b",
    "signer": "0x654f1b2DCF5eE0f42af2618ba269C1C8f8327BCA",
    "userId": "392916338"
  }
}