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Quite surprised at this comment. The reason I got into blockchain was _because_ of the incredibly difficult technical challenges it poses. Among the few I get to work on:
- How to implement robust p2p networking algorithms for sharding in a distributed system such as Ethereum (a very deep rabbit hole), as Ethereum is migrating to a "sharded" architecture
- How to solve the "data availability problem" https://github.com/ethereum/research/wiki/A-note-on-data-ava.... The current solution uses advanced cryptography known as KZG commitments https://dankradfeist.de/ethereum/2020/06/16/kate-polynomial-...
- How to solve the problem of "transaction frontrunning", in which miners have an asymmetric advantage in ordering transactions they put in blocks for their benefit, which can adversely affect users creating those transactions. This is a problem known as MEV (Miner Extractable Value) https://research.paradigm.xyz/MEV and there is some incredibly sophisticated work going into this problem. It is a deep engineering problem as well
I could go on and probably give you 20 other incredibly technical, challenging problems that are on the bleeding-edge of this technology. If you're interested, would be happy to chat more!