The digital currency community has had another, albeit smaller, controversy over an exchange suddenly losing money, freezing accounts, and promising to pay its clients back over time. Digital exchange CryptoRush announced yesterday that it had lost 1.5 million BlackCoins (a digital currency similar to Bitcoin, though much less established) worth approximately $70,000 due to a bug that allowed users to withdraw more than they had in their accounts. By the time the bug was fixed, CryptoRush didn’t have enough reserves to cover the legitimate deposit accounts left behind. Digital currencies under the microscope For those within the crypto community, there…