a cryptocurrency exchange has mistakenly sent emails to 125,000 users, wrongly telling them their two-factor authentication settings had been changed. Coinbase apologised on social media, saying it was focused on building trust and “that issues like this can hurt that trust”. Two-factor authentication requires users to enter information, such as a texted code, in addition to a password and Under most circumstances, only someone with access to the account could change two-factor authentication settings. the alert caused alarm many among users, who feared their accounts had been hacked. Is hacking delating the efforts to making crypto currencies an internet native payment system ?