{
  "manageEntity": {
    "action": "Save",
    "entityId": "297590",
    "entityType": "Track",
    "nonce": "0xfa2713d8730dca05e64d172e3b91aee15a978b9967f826f055912e9797a90bed",
    "signature": "0xe033751ced5d48fcb69dee1496c92c939ad93aa3fa973268309cb260fed4a4da00220d07e3c5ffd2d179dba898fe41ca096a328fb550931a1df06311d6c99e7e1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}