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BitStamp, one of the top Bitcoin exchanges at the moment is temporary unavailable as security precaution due to possible compromise of some of their hot wallets. The downtime should not take a lot of time and there is probably no reason to be concerned about the possible problem as the service does store most of the coins in their cold wallet. Only some of the deposits/withdraws that have happened in the last few hours might be affected and these should be covered by BitStamp. In the meantime, while the service is temporary unavailable, there is a warning to users of the exchange not to send any coins to their wallets as these deposits will not appear in your balance, so you should wait for BitStamp to be fully operational before doing any coin deposits.
Update: It seems that the security breach on January 4th have caused some of Bitstamp’s operational wallets to be compromised, resulting in a loss of less than 19000 BTC according to the latest update from the exchange. The service is still not back to normal operation, but Bitstamp reassures their customers that they don’t have to worry that they will loose their coins.
This breach represents a small fraction of Bitstamp’s total bitcoin reserves, the overwhelming majority of which are held in secure offline cold storage systems. We would like to reassure all Bitstamp customers that their balances held prior to our temporary suspension of services will not be affected and will be honored in full.