There’s a reason I’m saying ‘digital cash’. I carry no water for current cryptocurrencies or blockchains. I’m interested in the goal, not any implementation (and what frustrates me about these crypto stans is their ego fixation on the implementation and the culture/brand/Lamborghinis over the goal).

As for credit limits: first off, Visa and Mastercard are payment systems - they don’t give you credit limits. Your card has ‘Visa’ or ‘Mastercard’ written on it, but it’s your bank that lends you the money to spend via V/M. I’m not proposing that the bank be replaced - I’m proposing that the payment system be replaced. Your bank will lend you money, and you will spend it using [tbd].

(BTW, I developed the lending algorithms at a unicorn startup bank. Billions in credit was dispensed by my code [and that of my reports]. I’m intimately familiar with that ecosystem. It’s not my central point here, but I do believe there’s substantial room for modernisation in that respect at almost every point in the chain: the CRAs, the lenders, the collections agencies, etc. If you’re interested, I’d be happy to expand, but right here I don’t want to distract from my actual point above.)