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Bitcoin has become the popular payment method for ransomware over the last two years , as the digital currency provides cybercriminals with a means of collecting ransoms , while also making it difficult to get the ransom - collectors ' identities , thanks to the level of anonymity it offers .
 cybercriminals: attacker; the digital currency: payment method; ransomware: tool; Bitcoin: payment method; the last two years: time
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:
 cybercriminals: attacker; the digital currency: payment method; ransomware: tool; Bitcoin: payment method; the last two years: time