{
  "manageEntity": {
    "action": "Save",
    "entityId": "1218595498",
    "entityType": "Track",
    "nonce": "0x19de1a622ec32a77d474fb5067a9c295c92a1b859077a8e0f52483759ec28d78",
    "signature": "0xce53650f5d296af5234bd6d581d7f03ec1b048c02e2b5ef51a019846c67dcd04764180a16fa73fd068c9ffc2a0a7d17960124d9786e0b338393ba1f64c8978261b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}