Unconfirmed transactions cannot be withdrawn.
Transaction that already is in at least one block is confirmed by definition - the act of being included in a block results in a confirmation.
Unconfirmed transactions can be "cancelled" by double spending the coins in the unconfirmed transaction.
Unconfirmed transactions cannot be withdrawn. Transaction that already is in at least one block is confirmed by definition - the act of being included in a block results in a confirmation.
Unconfirmed transactions can be "cancelled" by double spending the coins in the unconfirmed transaction.