{
  "manageEntity": {
    "action": "Save",
    "entityId": "1591173384",
    "entityType": "Track",
    "nonce": "0x440aada7b83d3b57dbe8c0cbd6f9fe5580d30990ee57f8a65412d1e8f7221f29",
    "signature": "0xadcaf0f39391fe216d3c47ffe13909311b21653d49538e571c66e3a2856c50c864c5281ffc70d6dd5b1189097b16b93a8f524d8102b2052c2b9534083af7a9451b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}