The databases were stolen Attack.Databreach between 2011 to 2017 from widely visited forums providing information about Bitcoin mining and trading . The combined number of data stolen Attack.Databreach from these forums is more than 12,000,000 including 536,727accounts from MerlinsMagicBitcoin.com which suffered a data breach Attack.Databreach in January 2017 , 514,409 accounts from BitcoinTalk.org forum which was hacked Attack.Databreach in May 2015 , 568,357 stolen Attack.Databreach from BTC-E.com back in October 2014 , 21,439 accounts from BTC4Free.com which was hacked Attack.Databreach in January 2014 , 21,439 accounts from BTC4Free.com which was also hacked Attack.Databreach in January 2014 . 3,153 Bitcoin.Lixter.com which was breached Attack.Databreach in September 2014 , 1,780 BitLeak.net accounts stolen Attack.Databreach back in March 2014 , 28,298 DogeWallet.com accounts stolen Attack.Databreach in January 2014 , 61,011 MtGox.com stolen Attack.Databreach in June 2011 , 34,513 BitsCircle.com ( breach Attack.Databreach date unknown ) 10,855,376 BitcoinSec from 2014 breach Attack.Databreach and 3,149 accounts from TheBitcoinShop.pixub.com ( breach Attack.Databreach date unknown ) . In some cases , the passwords have been decrypted while some are using SHA1 hash which is easy to decrypt since Google security researchers have already broken the SHA-1 web security tool last month . The price set for this data is USD 400 ( BTC 0.3817 ) It must be noted that BitcoinTalk.org and BTC-E.com are two of the most important bitcoin related platforms having their data sold on the dark web since 2016 by several other vendors . However , we are not sure about rest of the platforms . Either way , if you have an account on any of the forums mentioned above change your password asap . Also , some of the forums discussed aren ’ t active anymore ; therefore , the relevance of their data is out of the question .