{
  "manageEntity": {
    "action": "Save",
    "entityId": "1618572917",
    "entityType": "Track",
    "nonce": "0x3abecf764a2d83ba26e64aabcd681c6076bfc2d17f0f55971d95a995075a8163",
    "signature": "0xfaaf3615defe5dba5ab45d6e7f709836b963e30bafd5f5a08e763d6c1f127d677a27303c4bf90bef0f3fba4b7cf2554ac5af9eac1f90da993719eb785981a53b1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}