{
  "manageEntity": {
    "action": "Save",
    "entityId": "957444937",
    "entityType": "Track",
    "nonce": "0xfbd44235cb98c0a81cfefafc47ccdddbb64b55d5cef24d246802e92bc7e92044",
    "signature": "0x761ca66642bcbd08ddcfd2c210931f7ee60fa9e8068ef58b9c8ef5fcd59c6a8b7763679e8b8326c4d856009bb51363fdab1ca45e80d575b4648c5455b55279a41b",
    "signer": "0x0D2c1331F52a98aF1Bd206E3C28062E717CA9E51",
    "userId": "597927803"
  }
}