{
  "manageEntity": {
    "action": "Save",
    "entityId": "251090",
    "entityType": "Track",
    "nonce": "0x7c7adcd62e92655f345f2dbf0799a7c0e625ebcecf43e46464e6eca86325eacf",
    "signature": "0x873a9ce09b0da24d789635856130608d987132740492cec373a5ce456b6657c631b76380a28dd66dbc6a78bf17c43664962fb8c0f1d228c7756a1abc6ceaa79a1c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}