{
  "manageEntity": {
    "action": "Save",
    "entityId": "1564631978",
    "entityType": "Track",
    "nonce": "0x344b6a9fc1d31600515e91f74e48ba87b9be30af08632ea2bf73333ba733131a",
    "signature": "0xc15e91a413b7cd6c86c5d04ade40dedc18324954dcfb1211eae2fab25b45dd993082a56e094fbeaedb33b71d0d4945c615b8c22c191338f456cefd09511b14521c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}