{
  "manageEntity": {
    "action": "Save",
    "entityId": "770123",
    "entityType": "Track",
    "nonce": "0x59e401f4af5d552ddc7614d060add1f3879e1db7f36bfb777f8291776c4fc70e",
    "signature": "0x912a16b1e8a991f17d8b910ec2c15613b57526d6089ef0caa16411e33e3b4b086f53fc9e2b944f3c244a013bd8eff70b73ff899696beec3c2cf50b23c8a547f11b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}