{
  "manageEntity": {
    "action": "Save",
    "entityId": "772568359",
    "entityType": "Track",
    "nonce": "0xe3f5fe768da9e5f643338a02dc5f04af32d1bbdcc210f4a3ed8941de919f20d3",
    "signature": "0xfd6b0e38c56840658419cefce9d68af6806671a531fc0c9cb307e823e2e7e935335acfd0e8e5f66b05a45f1c9cc932e1f566b64f29efb4e514d55020050c48411c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}