South Korean cryptocurrency exchange Bithumb says it accidentally sent $44B worth of bitcoin to customers as promotional rewards and has recovered 99.7% of it (Hyunjoo Jin/Reuters)

Hyunjoo Jin / Reuters: South Korean cryptocurrency exchange Bithumb says it accidentally sent $44B worth of bitcoin to customers as promotional rewards and has recovered 99.7% of it   —  South Korean cryptocurrency exchange Bithumb said on Saturday it had accidentally given away more than $40 billion worth of bitcoins …