{
  "manageEntity": {
    "action": "Save",
    "entityId": "837772526",
    "entityType": "Track",
    "nonce": "0xb40a01e3306d64ee322b69a81b3b3143d5d5b2e0858fb0d936ec40b20dd42fa1",
    "signature": "0x4fa5f180ea8b3707a03398bd0b51a107d15ec7c396c97e2469a56ee4f2d2c9c25cd2d145766db94fc68240d0de2c65ae22102bd9e2ea44d1959cf38ca1214bec1b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}