japanese currency exchange

TOKYO: A blunder at a Japanese cryptocurrency exchange let investors briefly buy bitcoins for free - though none were able to profit from the mistake. Zaif, a government-registered exchange run by Osaka-based Tech Bureau Corp, said on Tuesday that a system glitch had let seven customers buy bitcoin with no yen value during a 20-minute window last week. The exchange voided the trades after discovering the error, which happened on Feb. 16 - though it was still trying to resolve the issue with one customer who tried to…