# Withdrawal or Unshielding

Looking at the `transferFrom` & `transferMultiple` functions you’d see a recurring parameter called `_transferData` this object contains a property called `tType` which signifies the transfer type, this can be either `INTERNAL` or `EXTERNAL`. External transfers tells the contract to unshied the asset being transfered and the address provided as the `_receiver` is assumed to be a non-stealth address.

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