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TDO claims the studio initially agreed to pay a ransom of 50 Bitcoin ( $ 67,000 ) by January 31 , and the two parties even signed a contract , albeit TDO signed it using the name " Adolf Hitler . "
 ( ransom: pay a ransom,  50 Bitcoin: price, $ 67,000: price, January 31: time, the studio: victim) 
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: pay a ransom,  50 Bitcoin: price, $ 67,000: price, January 31: time, the studio: victim) 