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This technical overview explains how blockchain systems maintain shared ledgers and how their components fit together. It introduces cryptographic hashes, digital signatures, transactions, blocks and the processes used to agree on additions to a ledger.
The report compares permissioned and permissionless systems, discusses consensus models and smart contracts, and examines limitations, misconceptions and possible applications. It treats cryptocurrency as one use of the technology within a broader technical account. The complete 2018 NISTIR 8202 includes its original illustrations, glossary and references.