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blockchains 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

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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.

Well, technically DVCSes like git use "blockchain" (the repo, logically, is pretty much a chain of blocks that incorporate the hash of the previous blocks - just tree instead of linear dependency).

So we are already successfully using blockchain for decades just not as... currency provider.

Forward secure sealing (used in logging) also have similar idea

What makes it a block chain instead of a tree is that there's a way to form consensus on which block is the next in the chain.

What makes it different than database logging is that the consensus method is distributed and decentralized, and anyone can participate.

>What makes it a block chain instead of a tree

Or a Merkle tree

The Merkle tree used by git is only a component of blockchain. Also in three or four years blockchain will have been in use for decades itself (i.e. two).

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