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In January , the hacker collected an unspecified Bitcoin reward for reporting a bug to the AlphaBay staff that would have allowed an attacker access to over 218,000 private messages .
 ( discover vulnerability: reporting,  hacker: discoverer, a bug: vulnerability, AlphaBay staff: vulnerable system owner, allowed an attacker access: capabilities, January: time) 
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:
 ( discover vulnerability: reporting,  hacker: discoverer, a bug: vulnerability, AlphaBay staff: vulnerable system owner, allowed an attacker access: capabilities, January: time) 