Yeah that was me! I made scratch off tickets at the @Cleveland Bitcoin halving party. It was only semi successful. I was using an lnbits beta instance and people had a hard time redeeming. But they were giveaways anyways so 🤷 . Cashu seems a better choice for this sorta thing. I didnt know enough abt it (or it wasnt quite ready yet?) back then. To @AU9913's point I dont think there is anything preventing that if the use-case is vouchers (this is why cashu exists). The QR codes authorize withdraws from a wallet but if that wallet doesnt exist or is unfunded, then the QR holder is effectively rugged.