Deposit and withdraw
Burn a coin back into the vault it was launched against and take your share of what it holds, or add to that backing for everyone. Both go straight to the contract.
The vault
What it holds right now
Withdraw
Burning is the only way anything leaves the vault. You get your share of every asset it holds, priced off the supply at that moment, in one transaction. No approval, no queue, and nobody can turn it off.
Burning is permanent. The supply only goes down.
Deposit
The supply was fixed at launch and there is no function to add to it, so a deposit here mints you nothing. It raises the backing behind every token that already exists, your own included. If you want a coin of your own, launch one instead.
This is a gift to holders, not a purchase.