Kraken, a popular cryptocurrency exchange, shut down for a several hours of scheduled maintenance on Wednesday; 30+ hours later it is still down (Jon Southurst/Bitsonline)

Jon Southurst / Bitsonline:
Kraken, a popular cryptocurrency exchange, shut down for a several hours of scheduled maintenance on Wednesday; 30+ hours later it is still down  —  Kraken users have expressed frustration and anger on social media as a scheduled upgrade went from two hours to more than a day.





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