There are three layers of enterprise security to think about:

• The physical IT infrastructure layer, which includes use case-specific issues such as EAL5, network, and infrastructure isolation requirements.
• The blockchain middleware layer, which includes requirements for crypto modules, encryption levels, encryption on data storage, transfer and data at rest, and visibility of data between participants in the network.
• The blockchain consensus (trust system layer), which is central to blockchain and necessary to guarantee basic data store properties. If there are more players in the network, they have to bring capital equity to scale. This is about building a shared data store with enterprise data qualities at a lower barrier to entry. Consensus, even minimal consensus, is necessary to ensure this on the architecture in place. There's now a divide between cryptocurrency-based trust systems and non-cryptocurrency-based trust systems. The former models, such as POW/PoS, aren't sustainable for enterprise use cases aspiring to create permissioned blockchains.