{
  "manageEntity": {
    "action": "Save",
    "entityId": "942392870",
    "entityType": "Track",
    "nonce": "0x3600b121b17b423b576cee4f12166ad469ff61edc3b396e7c043ef518b2294b0",
    "signature": "0x0405c5304aeaf18bacf917b92f0363152226e84840213488848afe36353768aa4d22f3be677e231c1a4e3575b6c45292abce2ae6642ce5aea39b094e163c099d1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}