The blockchain technology is at its infancy stage and it is already making innovations in different industries. Though there are a lot of restrictions against it presently and some nations do not want to adopt it
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To the best of my knowledge only cryptocurrencies can be forbidden or restricted in some countries but the blockchain technology can't be restricted in no shape or form.
Moreover many companies tries to integrate blockchain in their business-models as the most advanced accounting system. And such changes are considered even at the state level, so there is no restrictions for technology itself