  There is a growing interest today in blockchain technology as a possible
foundation for the future global financial ecosystem. However, in order for
this future financial ecosystem to be truly global, with a high degree of
interoperability and stability, a number challenges need to be addressed
related to infrastructure security. One key aspect concerns the security and
robustness of the systems that participate in the blockchain peer-to-peer
networks. In this paper we discuss the notion of the decentralized trusted
computing base as an extension of the TCB concept in trusted computing. We
explore how a decentralized TCB can be useful to (i) harden individual nodes
and systems in the blockchain infrastructure, and (ii) be the basis for secure
group-oriented computations making within the P2P network of nodes that make-up
the blockchain system.
