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With data hijacking , attackers compromise insecure database installations , copy data , then delete the contents and leaving behind a ransom note in the form of a directory name demanding a ransom be paid via Bitcoin .
 via Bitcoin: payment method
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:
 via Bitcoin: payment method