One of the most salient features of our Tech Hiring culture is that there is so much bullshit. Everyone knows this. Each of us contributes his share. But we tend to take the situation for granted.
Unfortunately, the useful part is not new and the new part is not useful.
The useful-but-not-new part is that its datastructure is a Merkle tree - something you know already, it's like git.
The new-but-not-useful part is that it has a decentralized consensus algorithm. Technically it's impressive, but it is also very complex, which means for whatever thing "you can do with the blockchain", there is a simpler - therefore better - technical way to do it. Therefore in most cases the blockchain is "needed" not technically but for ideological tech-bro libertarian reasons.
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The blockchain is something new and useful.
Unfortunately, the useful part is not new and the new part is not useful.
The useful-but-not-new part is that its datastructure is a Merkle tree - something you know already, it's like git.
The new-but-not-useful part is that it has a decentralized consensus algorithm. Technically it's impressive, but it is also very complex, which means for whatever thing "you can do with the blockchain", there is a simpler - therefore better - technical way to do it. Therefore in most cases the blockchain is "needed" not technically but for ideological tech-bro libertarian reasons.