When you register on The Lott website or The Lott app, you are provided with a lottery account and a digital wallet account. The digital wallet, where your deposits are held and prizes are paid to once your account is verified is operated by Tatts Online Pty Ltd, a Victoria entity subject to Victorian law.
There are similar unclaimed money rules for businesses subject to laws of other Australian states and territories. For customers outside Victoria, claiming money from the Victorian State Revenue Office is very similar to claiming money from the state revenue department in your home state or territory.