When I’m having discussions with corporate people who are thinking about how to set up a blockchain use case, I hear a lot of concerns about public ledgers: The technology is not mature enough, it’s too slow, we need to protect our proprietary data. I feel like there are a couple of misconceptions though and a key drawback of permissioned ledgers that people underestimate: Combinatorial complexity. So I’d like to stick up for public ledgers and share my 2 cents about the topic.