{
  "manageEntity": {
    "action": "Save",
    "entityId": "900240675",
    "entityType": "Track",
    "nonce": "0xbc375e81199eb9d0a662ec38297a577c6f247450ddee2a83b3d64e11a1d7717a",
    "signature": "0xf3fb0df837c500d5eae7c0d8ec1e66f5ef42eab7d5225a752d5abb18648849385558d637cecbc82009bcace30ca731e4cc855a99df3c0714c9929b098c08ece81c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}