{
  "manageEntity": {
    "action": "Save",
    "entityId": "226522",
    "entityType": "Track",
    "nonce": "0xd4b5a97bbd7fc2baea218dcdb4f77a7b26537a304837ee21eddd1279dec6bf25",
    "signature": "0x3f7efef4811a2b9a6ecb3914dd2269e0ec42e8a2fb47ec31d7a7caf6a14e6ae9510524665af912ec99a8e2f5e269851bb0bc82085ba2294105fb8ed2c747d1fb1c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}