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The attackers then demand payment before returning control of the computers , often through money paid into bitcoin or other largely untraceable online currencies .
 ( ransom: demand payment,  The attackers: attacker, bitcoin: payment method, other largely untraceable online currencies: payment method, computers: 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: demand payment,  The attackers: attacker, bitcoin: payment method, other largely untraceable online currencies: payment method, computers: victim) 