{
  "manageEntity": {
    "action": "Save",
    "entityId": "1611524217",
    "entityType": "Track",
    "nonce": "0xa0a855ffc26625ecffce705dd18f013a8ad9715f05c3a6ed4786087db0109a78",
    "signature": "0x1fdfe69cef57783e14f9d6f972d48c8fe51235eddd0ea8cc8f3e841eba2159b71add78f9c27e42f5c6ac98b77caede8a86c62c80d50cf381f355737ce7f3d8531b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}