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The ransom note suggested that they were expecting ransom amount in Bitcoins while the amount to be paid was not disclosed clearly .
 ( ransom: were expecting,  The ransom note: tool, Bitcoins: payment method, they: 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: were expecting,  The ransom note: tool, Bitcoins: payment method, they: attacker) 