{
  "manageEntity": {
    "action": "Save",
    "entityId": "509212",
    "entityType": "Track",
    "nonce": "0xe311ff2d5ffa95e8a2144484fa90ae51f3ee218c540db8bda34fc12ccd9b6c75",
    "signature": "0x615a050d1f53660e8926957312106f6439071228c98ccec5291235b30ad3d13b3c219db57d3d6a4fd628fb6d00772a4c0ebf2269bb852c806a768b5a1d2dc0971c",
    "signer": "0xab149ff8191773cca3D658756256803CE45A547c",
    "userId": "22023"
  }
}