History repeats itself. It especially feels that way in the blockchain security space.
One of the advantages of blockchain (and the early days of the internet) is composability -- our ability to build on someone else's work. Often because it's open source.
A recent hack on Binance chain was the result of composability. Code had been taken from one project and imported into Binance chain. Turns out that code had a bug.
In 1989, Clifford Stoll wrote in a fantastic book on one of the first documented hacking attempts. He writes 30 years ago "diversity in software is a good thing."
As we build on to the open source internet with open source blockchain components, we should be thinking about composability, diversity and of course security.