{
  "manageEntity": {
    "action": "Save",
    "entityId": "561692",
    "entityType": "Track",
    "nonce": "0xffa7cf4e04cadb88cff01ca3e2197da6a524a117ae0f254d4f970979b835d39a",
    "signature": "0xf9e4c83b5f4a14fc28325d12c22bca9947fe0b19167bbce8568bf84a010d20201e46467b8b18a49a9803fc064ec069701fa1a93a61ac026adabd7f3605bdbf4e1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}