2077
The combined number of data stolen from these forums is more than 12,000,000 including 536,727 accounts from MerlinsMagicBitcoin.com which suffered a data breach in January 2017 , 514,409 accounts from BitcoinTalk.org forum which was hacked in May 2015 , 568,357 stolen from BTC-E.com back in October 2014 , 21,439 accounts from BTC4Free.com which was hacked in January 2014 , 21,439 accounts from BTC4Free.com which was also hacked in January 2014 .
 ( data breach: data stolen,  these forums: victim, 12,000,000: number of data) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( data breach: data stolen,  these forums: victim, 12,000,000: number of data) 