{
  "manageEntity": {
    "action": "Save",
    "entityId": "528880",
    "entityType": "Track",
    "nonce": "0x5c413f00c0501888420652d721f6c061e0635e07d43a8135eeb662a8d7187052",
    "signature": "0xfcd056d9b50c9c02806de1a80115b984fbe16ed380a81e6e545c663858d16a6625230d09ce4475ee52bc1246c23d15670d6209ca81f0cad4c575fbdbb1b4d4621b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}