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Separating Agreement from Execution to Improve the Scalability of BlockchainsThesis • September 24th, 2021
To implement a secure, decentralized ledger of cryptographically-chained blocks, Blockchain systems must implement several steps: select a group of transactions and include them in a block in a certain order; execute the ordered group of transactions; and agree with the other Blockchain participants on the results of the execution of the transactions through a consensus algorithm. Today, almost all Blockchain systems follow a monolithic architecture, where all these components are intertwined and executed on the same physical machine, sharing the same computational resources. As a consequence, these systems suffer from severe scalability issues, even in permissioned settings. In this thesis, we propose SepChain, a system that aims to improve on these scalability issues by proposing a simple and precise separation of the system into agreement and execution components. To demonstrate the benefits of this approach, we present a novel proof of concept of this principle, which consists of t
