btcFrom South China Morning Post | Bitcoin exchanges have been crippled by hackers exploiting a weakness in the digital currency’s core network. The biggest breach affected the ability of several major digital currency companies to process withdrawals, halting or suspending the process. No individual or group has claimed responsibility for the distributed denial-of-service (DDoS) attack, which overwhelms websites with requests for data.

“This went from an isolated exercise that was happening to a single exchange to a relatively broad-based attack,” said Andreas Antonopoulos, chief security officer of digital wallet provider Blockchain. Antonopoulos, who first made the discovery, was not sure how many were involved in the attack or where it originated. Top exchanges Bitstamp and BTC-e, which control more than half of bitcoin transactions, suspended or delayed withdrawals as trading platforms stepped up checks and inspections on order books.

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