{
  "manageEntity": {
    "action": "Save",
    "entityId": "1455978009",
    "entityType": "Track",
    "nonce": "0xc78c10d2b3ab6904ff2e75ecbd8283478dc9121069e34a6386e5b34be2569ab3",
    "signature": "0x67c55ec496aa08395f4a318b693cab9e06f9c97d1c9d36d261f61511616f40eb3768ee661422b0a8f809be58ec546e88398d680bd1ee86e644259b7c7e1ec50e1b",
    "signer": "0x6687B667182cfdc5646f5AEB14a9945c9b1d3A6B",
    "userId": "100"
  }
}