{
  "manageEntity": {
    "action": "Save",
    "entityId": "817794528",
    "entityType": "Track",
    "nonce": "0x8cf676fcd073ea818b94d4f1262c89d445e13c9766c7c20dbbd4aaf3d2caba1d",
    "signature": "0x14497c6bdfe1f51aab7e041a342a56a3d16d6accd0ae75898886e9c7aeed662b2e53ea8d723aea822dcba94b5b1047e49dca951bb11b82b48fb1065ad8edaa551c",
    "signer": "0x4439B21462c7CE1E2a3fb562C97F8174005755B8",
    "userId": "302421523"
  }
}