{
  "manageEntity": {
    "action": "Save",
    "entityId": "551310",
    "entityType": "Track",
    "nonce": "0x578c3bfdc1b5b797998eba2ece11d427f3548a7ec5a3689bf7adcd8176a4f86a",
    "signature": "0x568c5cac3cf5c58f53dacb91903d64aa0fdbbe3661df3e712b452902bc4cccad54a9a2b872e2618011262c031088b43d015f44a694319f8f7389b4fe9303926c1c",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}