{
  "manageEntity": {
    "action": "Save",
    "entityId": "1574762715",
    "entityType": "Track",
    "nonce": "0x4bd1419b81454c7d4ebdfe4536922e50dba2953ecf7e1bdc5233a95ced804887",
    "signature": "0xa042b68351222d5b4b2fa4eb05ec7b0961fb1c2d69fe22778c7bc2fbd7b8eaf4165623dbba981ac417ffdaddd7d7de44b71e30d1be39c03a76188f4b5d62adb81b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}