{
  "manageEntity": {
    "action": "Save",
    "entityId": "302152814",
    "entityType": "Track",
    "nonce": "0x63f2afb7880da72a23174f4e652f19c544415f58cedf1c5e6a27ad5ff4329fed",
    "signature": "0x2a6a05d19f9c0a979ba321734bde982b4d3042fe3d5fcb6bb67af452fca2451007e809800b45e372f577f0009aab94927352b6e4ee6cfa114d3515e8d38d46cc1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}