Re:Not Paying with Cash
by raincole on Wednesday September 03, 2025 @10:45PM
(#45122937)
In Taiwan, there is a similar system called EasyCard. That works offline.
...And as you expect it is vulnerable to double spend attacks. Hilariously the vulnerability was revealed in 2014 and nothing has been done to mitigate it. Yes, you can double spend in Taiwan today if you don't mind risking jail time.
From my (rudimentary) understanding of CAP, there is no prefect solution to this. I wonder how Japan handles it.
...And as you expect it is vulnerable to double spend attacks. Hilariously the vulnerability was revealed in 2014 and nothing has been done to mitigate it. Yes, you can double spend in Taiwan today if you don't mind risking jail time.
From my (rudimentary) understanding of CAP, there is no prefect solution to this. I wonder how Japan handles it.