{
  "manageEntity": {
    "action": "Save",
    "entityId": "438959",
    "entityType": "Track",
    "nonce": "0x1ae683116f7755dc789f942273ed75a2c7fcc99986c4912f87af57ea0b67294a",
    "signature": "0xa0df6e3bbb644321e1613bf083a90f1a3e2ee1c6d1b9432b3933c16d5c9a447a252b41225161aadcad60bd63a637b16dd058869e19bf74ae89642837ad8d68611b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}