I think blockchain is a great example of interesting tech with very few real applications outside of crypto currency. Others have pointed out that there's many

I think blockchain is a great example of interesting tech with very few real applications outside of crypto currency. Others have pointed out that there's many cheaper ways to prevent bit rot. Almost anything you can do with a blockchain can be accomplished with a centralized ledger. Bitcoin is a great example of interesting tech that overcomplicates something everyone understands to fix problems most people don't have. Should we ever find a major vulnerability in a common implementation, it could be game over.