{
  "manageEntity": {
    "action": "Save",
    "entityId": "1388424487",
    "entityType": "Track",
    "nonce": "0x72b02729f61e0f2a1c7d2bdca67cae9c3fce9bf10f4e06d054c39ea7ca8935d5",
    "signature": "0xf001c9928ebe79fd2e672a6ae07f4fa9b7b9a50292f2dcf42efd3c7936df0f037408eea61f8dff0ae6b6312993f6b392f6ac7078063f205bf935d827d9cb82561c",
    "signer": "0x12705C8Fe8CE886CeFEFa0d4d46E906f2c35C954",
    "userId": "477934274"
  }
}