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> Can you give an example?

it is very easy to find an example of censorship, not sure why you need one but let's say: "World marks 32 years since Tiananmen massacre as China censors all mention of it"

There is also daily examples of censorship on this website.

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I mean an example for when you'd want to put user data on the blockchain – rather than a description of the general category. (It's a mistake many mathematicians make at one time or other: declaring a property on all members of a certain set without first checking whether it's the empty set.)

And yet we all knew about it without blockchains and cryptotransactions are banned in China.

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