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For permissionless blockchains, scalability is paramount. While currenttechnologies still fail to address this problem fully, many research workspropose sharding or other techniques that extensively adopt parallel processingof transactions. In these approaches, a potentially large number of committeesof nodes independently perform consensus and process new transactions. Hence,in addition to regular intra-committee communication, (1) new transactions haveto be delivered to the right committee, (2) committees need to communicate toprocess inter-shard transactions or (3) to exchange intermediate results. Tocontrast slowly adaptive adversaries, committees should be frequently changed.However, efficient communication to frequently-changing committees is hard.  We propose a simple approach that allows us to implicitly select committeemembers and effectively deliver messages to all members of a specificcommittee, even when committees are changed frequently. The aim of our designis to provide a committee selection procedure and a committee-targetedcommunication primitive to be applied in most of the scalable blockchainarchitectures that are currently proposed in literature. We provide atheoretical proof of the security of our approach and first experimentalresults that shows that our approach might be feasible in practice.

Blockchain Scalability and Security: Communications Among Fast-Changing Committees Made Simple