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In that case , the hackers wiped the organization ’s servers and backup servers , and demanded 50 bitcoins — valued at $ 43,000 — to restore the data .
 ( ransom: demanded,  50 bitcoins: price, $ 43,000: price, wiped the organization ’s servers and backup servers: attack pattern, the hackers: attacker) 
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: demanded,  50 bitcoins: price, $ 43,000: price, wiped the organization ’s servers and backup servers: attack pattern, the hackers: attacker) 