{
  "manageEntity": {
    "action": "Save",
    "entityId": "457102803",
    "entityType": "Track",
    "nonce": "0xc7b631fe6aeb4e9e4660629eb48d419866fbed008ab2d39a89e89c0596039051",
    "signature": "0x572e4298693c268ae1ad46cfb575efec41314d33c73577d9827dd3d0fd160b411c23a93775adc9d37aab8b90e5c13a32e0ef7de9d4e2cf60bd45f5c6234d7a2a1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}