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ZK-Rollups cannot be implemented in without a hardfork since Miners would have to verify a zero-knowledge proof and miners do not do this in Bitcoin. Bitcoin does have Hash-preimage verification since the very beginning - one could imagine a distributed hash & hash-preimage generation but there is no such algorithm to my knowledge. If there was it would require new and complicated cryptography or a trusted dealer - which both isn't in the spirit of Bitcoin.
Optimistic Rollups are not possible on Bitcoin since they require to undo a transaction in case any party challenges the result. They would also require miners to verify the rollup when someone challenges the result which miners do not do in Bitcoin.
I don't think any of this is a good idea. Rollups always end up with so much chaos that it isn't in the spirit of Bitcoin. And if a construction requires a trusted dealers or a trusted group of participants - why bother with it in the first place - just do it in a SQL database and write the result on the Blockchain.
Big Green Egg
Fuck don't know any of these folks xept Snowden. I asked him a question once In a public forum zoom call thing. I was so excited to get to ask a question that I forgot my question and sat down. Thus began.........the dark times........
What you say about working all your life, I also observe that here in Portugal. I know several people who are already at retirement age who refuse to stop working. I've asked them why they do this and the answer is unanimous, "If I don't work, I'll die of boredom." It's not for money reasons. I don't quite understand this way of being yet, maybe because I still have many years ahead of me before I reach that age. When I get there, maybe I'll understand.