CryptoKitties served as an even more pertinent example, when the supposedly-scalable Ethereum network crashed due to the demand for digital cats. So, what is the second layer? Basically, the second layer is what it describes; a group of projects, applications, and infrastructure software solutions that sit on top of blockchain’s base layer. The proliferation of second layer solutions will take us even further, and there are many examples. As mentioned above, one of the earliest examples of the second layer is one that most know about called the Lightning Network (LN).

Source: Forbes April 25, 2019 05:48 UTC