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According to the indictment , the attackers offered the city the option of paying six Bitcoin ( currently the equivalent of $ 22,500 ) to get keys to unlock all the affected systems or 0.8 Bitcoin ( about $ 3,000 ) for individual systems .
 the attackers: attacker; the city: victim
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: ransom 
  Option: victim, attacker, payment method, attack pattern, damage amount, tool, time, price, place 
Text: {0} 
Answer:
 the attackers: attacker; the city: victim