{
  "manageEntity": {
    "action": "Save",
    "entityId": "887791760",
    "entityType": "Track",
    "nonce": "0xe0e29da2b6f372baab334438694c5d8bed325cb71c34c2c1d88075c98b2f7bfd",
    "signature": "0xf321ed25769efc32b685f9a4f191b9d8e16753618dc012875f57a3bebcf049b230e07eb2ebd25f91416281304668de02fab86e14681d9b42e379c434e122dcd91b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}