According to ChainCatcher, SlowMist Chief Information Security Officer (CISO) 23pds posted on social media that Authy, a popular 2FA service second only to Google Authenticator, was hacked, resulting in the theft of 33 million users' phone numbers. If you are an Authy user, please be wary of phishing attacks. The official developer Twilio has confirmed the vulnerability, and a large number of practitioners in the cryptocurrency industry use this 2FA software, so please ensure the safety of your assets.