{
  "manageEntity": {
    "action": "Create",
    "entityId": "177443278",
    "entityType": "Track",
    "metadata": "{\"cid\":\"\",\"data\":{\"title\":\"3 Bass.wav\",\"is_stream_gated\":false,\"is_unlisted\":false,\"field_visibility\":{\"genre\":true,\"mood\":true,\"tags\":true,\"share\":true,\"play_count\":true},\"is_downloadable\":true,\"stem_of\":{\"category\":\"OTHER\",\"parent_track_id\":382425628},\"owner_id\":42634173,\"track_cid\":\"baeaaaiqseaa2eu4om6c3jj242bvuxoraho6xvm6bwkbnv6gue3zwawfyyurh6\",\"orig_file_cid\":\"baeaaaiqsed24vx26pdx5b5xjah5klrfayqyqa4vawhm7raxnxbcus4ut252n2\",\"orig_filename\":\"3 Bass.wav\",\"audio_upload_id\":\"4400fe9806cf460f1eb2d0f2418fe23c\",\"duration\":209,\"bpm\":89,\"musical_key\":\"E flat major\",\"audio_analysis_error_count\":0}}",
    "nonce": "0x8c72b7790b0f21c040e3321bbac20cc6c83a6c5cb8258821955daba4c19ce785",
    "signature": "0x9143ec742599fe6441f504e6137c3e1936c5f7cbfdfe87621d222410d87721e13ba4cd46efd86d61340cef6d458144c0f3d8f7cd3d993c80a9d86e0cfb30d3391b",
    "signer": "0x18a7B3405E81900d8aF72d98D5f2C54e2C988f9b",
    "userId": "42634173"
  }
}