{
  "manageEntity": {
    "action": "Save",
    "entityId": "214319100",
    "entityType": "Track",
    "nonce": "0x7e41d6efd3e2b0df9510eacc59a8905da219364327919ea8406e0b69e0405df8",
    "signature": "0x38fb56838cf82c2ca14fd4c6f0b3a8297af5a793bacf44e49d16c5f0d7e2acd306eb7ccc8e607eefc75fab9d3890d9531fd280900ca1f21102c8b64787a762551b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}