Is Chaum's eCash concept still workable nowadays? * https://chaum.com/wp-content/uploads/2022/11/eCash_2.0_9-7-22-.pdf https://chaum.com/wp-content/uploads/202

Is Chaum's eCash concept still workable nowadays? * https://chaum.com/wp-content/uploads/2022/11/eCash_2.0_9-7-22-.pdf https://chaum.com/wp-content/uploads/2022/11/eCash_2.0_9-7-2... * https://chaum.com/ecash/ https://chaum.com/ecash/ * https://www.nasdaq.com/articles/the-genesis-files:-how-david-chaums-ecash-spawned-a-cypherpunk-dream-2018-04-24 https://www.nasdaq.com/articles/the-genesis-files:-how-david... * https://en.wikipedia.org/wiki/Ecash https://en.wikipedia.org/wiki/Ecash