SlowMist Chief Information Security Officer 23pds posted that Authy, a popular 2FA service second only to Google Authenticator, was hacked and leaked 33 million users' phone numbers. If you are an Authy user, be wary of phishing attacks. The current official developer Twilio has confirmed the vulnerability, and a large number of practitioners in the cryptocurrency industry use this 2FA software. Please pay attention to asset security.