You will need to provide identification to withdraw any winnings from an online casino. Unlike land-based casinos where you need to provide your ID at the door, its only required by online casinos when you are ready to withdraw your winnings. Some casinos will request a scanned copy of your drivers license or passport, while others may even require a copy of your latest utility bill to verify the legal address on your ID.
Each online casino has different requirements when it comes to withdrawing your winnings. Some of the requirements are put into place to protect the casinos against fraud, while other requirements must be carried out in order to meet their licensing requirements that were made by the licensing body where their casino servers are located. Some licensing jurisdictions have strict requirements while other don't have any.