Blocks and Chains
The new field of cryptographic currencies and consensus ledgers, commonly referred to as
blockchains, is receiving increasing interest from various different communities. These commu-
nities are very diverse and amongst others include: technical enthusiasts, activist groups, re-
searchers from various disciplines, start-ups, large enterprises, public authorities, banks, finan-
cial regulators, business men, investors, and also criminals. The scientific community adapted
relatively slowly to this emerging and fast-moving field of cryptographic currencies and con-
sensus ledgers. This was one reason that, for quite a while, the only resources available have
been the Bitcoin source code, blog and forum posts, mailing lists, and other online publications.
Also the original Bitcoin paper which initiated the hype was published online without any prior
peer review. Following the original publication spirit of the Bitcoin paper, a lot of innovation
in this field has repeatedly come from the community itself in the form of online publications
and online conversations instead of established peer-reviewed scientific publishing. On the one
side, this spirit of fast free software development, combined with the business aspects of crypto-
graphic currencies, as well as the interests of today’s time-to-market focused industry, produced
a flood of publications, whitepapers, and prototypes. On the other side, this has led to deficits
in systematization and a gap between practice and the theoretical understanding of this new
field. This book aims to further close this gap and presents a well-structured overview of this
broad field from a technical viewpoint. The archetype for modern cryptographic currencies and
consensus ledgers is Bitcoin and its underlying Nakamoto consensus. Therefore we describe the
inner workings of this protocol in great detail and discuss its relations to other derived systems.
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