{
  "manageEntity": {
    "action": "Save",
    "entityId": "891740611",
    "entityType": "Track",
    "nonce": "0x9b6866d13258f211966233873663f3490840f353c24cbc4a945e1fb498af55d9",
    "signature": "0x19f9300eae1f1d8adf18271dafdc75960839855acb24571a92af845df80e2fb360e9eb784296c4d3a5d296f17405784ba8729ce88f66c5359747c3b9a4c88bb21c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}