alt Hacker Newsblockchains are isolated environment where it can only know about data/states within itself.
if outside data is needed, then it needs something called an oracle, which delivers real-world and/or even other blockchain data to it.
you can learn more about oracle here: https://chain.link/education/blockchain-oracles
I’m convinced that there is a reason from blockchain, but it was like 10 years too early - OR - we’ve already passed the problem it solves and didn’t notice.