{
  "manageEntity": {
    "action": "Save",
    "entityId": "1543815468",
    "entityType": "Track",
    "nonce": "0x40689e967dc380a4949560d40267cdb09cae4e549f51e98eaaeff629f615be92",
    "signature": "0x6b02753a5a311dba0c0491b59d6702cd4fb546d6a0efa13218618167830a39040bd4cbac21049b4634d91108e07072d630f2b1f687a5c9d099bc7ff8635cd3a61b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}