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The only way to make it secure is for users to bring their own wallet. On first connection they would input their wallet ID so monster look can be paid out.

When a user wants to buy something he needs to make it outside of minecraft, or use a custom minecraft extension that handles the wallet client-side.

A theft-proof way can be to avoid the anonymizing features of Bitcoin, that's it, by having the return address (for change in a transaction) being the same as the origin address.

That way you can simply monitor the blockchain for every player's single Bitcoin address, without having any private key.

Any transaction from those accounts should be explicitly initiated by the player, and for that you show QR codes in the game.

Perhaps it might be appropriate to state this in the hero image of the landing page.

Are you in the WoT? Also are you aware of Eulora?