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Unlike Harak1r1 , this second group is a little bit more greedy and asks for 0.5 Bitcoin , which is around $ 500 , but this has n't stopped companies from paying , with 0wn3d 's Bitcoin wallet showing that at least three victims had paid his ransom demands .
 ( ransom: asks for,  0.5 Bitcoin: price, second group: attacker, $ 500: price) 
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:
 ( ransom: asks for,  0.5 Bitcoin: price, second group: attacker, $ 500: price) 