{
  "manageEntity": {
    "action": "Save",
    "entityId": "1145272831",
    "entityType": "Track",
    "nonce": "0x6489f8f2b81cf5f6c5e072d0e4b46dcf893ea36ab101dd6efb23600cfba79ced",
    "signature": "0x78fd2d16be44dc2ada04e076a9e7732652d5e4fd9eb0db294292bc238d4fc9d5322e0e40c11d8f0c877664cad75f6f345cbd431b79d32ae439508f454356137b1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}