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According to Cisco , the Coinhoarder group is by far the largest phishing operation that has targeted Blockchain.info , the biggest Bitcoin wallet service online .
 phishing: the largest phishing operation
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: phishing, data breach, ransom, discover vulnerability, patch vulnerability 
Text: {0} 
Answer:
 phishing: the largest phishing operation