This document specifies a reference architecture for Distributed Ledger Technology (DLT) systems including blockchain systems. The reference architecture addresses concepts, cross-cutting aspects, architectural considerations, and architecture views, including functional components, roles, activities, and their relationships for blockchain and DLT.

More details can also be found here: https://www.iso.org/obp/ui/en/#iso:std:iso:23257:ed-1:v1:en