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Different ransom amounts have been presented to victims , and the price of Bitcoin has climbed dramatically over the past week , causing some variation in the payment sizes .
 ( ransom: ransom,  Bitcoin: payment method, the past week: time, victims: 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: ransom,  Bitcoin: payment method, the past week: time, victims: victim) 