Consensus at the Frontier: Byzantine Fault Tolerance, PBFT, HotStuff, and What Blockchains Got Right and Wrong

Deep End Era. Engineering with Sankalp · Oct 10, 2026 · 1h

Seven organizations want one ledger, but they do not share a single source of trust. This episode builds from crash faults and Raft to Byzantine behavior and the impossibility results that constrain agreement. Different consensus approaches are examined through their assumptions, communication patterns and failure boundaries. The closing discussion considers how to prove and test consensus code, connecting protocol design to the reliability of the system built around it.

Chapters

00:00:00 Cold open: seven companies, one ledger, zero trust

00:02:31 Agreement is harder than it looks

00:04:35…