Cryptocurrency exchange Kraken is still down nearly 48 hours after the site initiated a system upgrade. Kraken engineers had estimated the downtime would only be two hours. Much like Gilligan’s three‐hour cruise that went horribly wrong, Kraken users all over the Internet are raging over the downtime and asking difficult questions.Nearly all digital currency exchanges have faced significant growing pains in the last year, as the interest in cryptocurrencies has grown exponentially. Coinbase and Bitstamp have been overwhelmed with user traffic, leading to delays. Bitfinex has been hit by DDOS attacks and recently had to stop registration for new users because of overwhelming demand. Binance and Bittrex have also halted new user signups.