Blockchain and distributed ledger technology are systematic and technological approaches to the problem of having different parties agree on some facts. To understand the problem, consider a social setting where a group of friends has to decide how to spend t
he evening: they could go to the cinema or go to the restaurant. Any of these choices have some different options: which movie are they going to see?Which restaurant would satisfy everyone?
A lot of us could agree that this kind of decision is time-consuming, and finding a solution that is acceptable and welcomed by the majority of people can be very challenging. This problem is a specific instance of a much more general problem: the construction of consensus (consensus-building) between different parties.
The construction of consensus gets more complicated as we move from our social setting to the more rigorous formal world of distributed systems, which is comprised of autonomous systems, very often managed by different organisations and subject to different organisations.
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