{
  "manageEntity": {
    "action": "Save",
    "entityId": "774751779",
    "entityType": "Track",
    "nonce": "0x36426663bf546b64dc90269964e5e31350bf33be1a654b2e32ebec5ae926a195",
    "signature": "0xa8b553ce04cb7ce8e93b1df6f94614578bb67bade38c902a1dedb162feba9a9d30453f73e2c931acc076120ac4bdb51a44c3202e625daf82279c84f75995eec71b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}