{
  "manageEntity": {
    "action": "Save",
    "entityId": "201820799",
    "entityType": "Track",
    "nonce": "0x62fc9e8490336c0466531dd62e46d2123d02fce3c99b1d65e2324c84de7676e7",
    "signature": "0x436ace54a79720d888480d05125f01a5fb71cf26922b27547d5f24d163da2c5e6c5c305cf28e36f42c29ce1aa879d4ac354c77e5be7bbf1f6c1876d1bf6a33e81c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}