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How does blockchain work?Blockchain records digital information and distributes it across the network without changing it. The information is distributed among many users and stored in an immutable, permanent ledger that can't be changed or destroyed. That's why blockchain is also called "Distributed Ledger Technology" or DLT.
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Critics, such as Greg Smith, MP for Mid Buckinghamshire, say soaring costs, delays, abandoned villages and damage to the natural and historic environment mean that it is not worth building.