{
  "manageEntity": {
    "action": "Save",
    "entityId": "353229050",
    "entityType": "Track",
    "nonce": "0xc333cbfc18670e4cd4702497320dade2ae2554921264b8f2b9d2fca869882e84",
    "signature": "0xfc01968bd23620563f518c9ae2e8df8dda9d39dfe482d3ec8822adace81e003329182841640c5b027778510616e5e74d48e69aa92415dcbcd512c05a16544b851b",
    "signer": "0x7D273271690538cF855E5b3002A0dD8c154bB060",
    "userId": "1"
  }
}