That link goes back to the fundamental concept of illegal numbers.
Anywhere a number can be written, illegal data may be written. Anywhere a number can be written immutably, illegal data may be written immutably.
This also gets at a fundamental issue of ethics of censorship, as censorship was viewed a few centuries ago: pieces of communication which enable wasted life being disabled & contained.
Do these images do that? Can abuse be stopped without censoring images of abuse?
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Phil raises an interesting suggestion that what-if blockchain miners weren't neutral?
Miners aren't neutral, after all. They just enforce minimal rules.
Could technological means be given to enforce cultural rules including with regards to reputation and past economic contributions? What would happen, if so?
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@Lasic - There are many large corporations developing blockchain research programs, including banks, microsoft, ibm, institutes funded by grants, etc.
This is not a viable complete protocol, but regulators are much more likely begin regulating claims. There is a saying that the code should speak for itself. I think this applies.