Every organization has hundreds of applications and databases, and its employees access them every day using their credentials (that is, their username and password). An attacker with such valid credentials can bypass existing security solutions, as they look like a legitimate user. As per the Verizon Data Breach report in 2016, more than 63% of successful breaches involved compromised credentials. Two-factor authentication (2FA) provides an added layer to the existing credential-based system protection as a solution to this drastically growing problem. As such, in this article, we will cover the following two topics: What is 2FA and Blockchain for 2FA.