3699
The attacker had also promised to return the stolen data and keep quiet about the hack if KeepKey would agree to pay him 30 Bitcoin ( ~ $ 30,000 ) .
 ( data breach: the hack,  the stolen data: compromised data, The attacker: 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:
 ( data breach: the hack,  the stolen data: compromised data, The attacker: attacker) 