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In a blockchain system, nodes regularly distribute data to other nodes. Theideal perspective taken in the scientific literature is that data is broadcastto all nodes directly, while in practice data is distributed by repeatedmulticast. Since correctness and security typically have been established forthe ideal setting only, it is vital to show that these properties carry over toreal-world implementations. This can be done by proving that the ideal and thereal behavior are equivalent.  In the work described in this paper, we take an important step towards such aproof by proving a simpler variant of the above equivalence statement. Thesimplification is that we consider only a concrete pair of network topologies,which nevertheless illustrates important phenomena encountered with arbitrarytopologies. For describing systems that distribute data, we use adomain-specific language of processes that is embedded in a general-purposeprocess calculus. This allows us to leverage the rich theory of process calculiin our proof, which is machine-checked using the Isabelle proof assistant.

Your Blockchain Needn't Care How the Message is Spread