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Hackers then can demand payment , typically in an untraceable cryptocurrency like Bitcoin — a digital asset that uses encryption — before agreeing to decrypt the files .
 ( ransom: demand payment,  Hackers: attacker, untraceable cryptocurrency like Bitcoin: payment method) 
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,  Hackers: attacker, untraceable cryptocurrency like Bitcoin: payment method) 