{
  "manageEntity": {
    "action": "Save",
    "entityId": "1742711123",
    "entityType": "Track",
    "nonce": "0x1ad9f7d1a0f9570f2f3c431a39880965a54447946f718a48b2a5836f483d262a",
    "signature": "0xe2481b74fd6b546fc609b60b424ce99187161604da451fd2e2d8f43a489677544bb94f3bbe71d0a33482a9eefa6be0582bf24f186801259b97ebd1c0b5605bab1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}