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Cashu is awesome. David Chaum would be pleased to see what you're done. I couldn't find it, but he made a cartoon explanation of an IRL scratch off card that could be used as physical ecash. It had multiple denominations on a single card, and you scratch off a few QR codes in different denominations to reveal the payment amounts for scanning by the merchant. Maybe you could team up with Madex or another artist to design a promotional scratch off card for conferences or IRL orange pilling kits. https://chaum.com/

For the payer to receive the e-cash in the first place, they must expose their IP to the same mint that the payee uses to redeem the e-cash. Using Tor or a VPN does very little to obfuscate actors with a whole network topography view.