Byzantine Fault Tolerance in Practice
BFT handles malicious nodes in distributed systems. Required for trustless networks but computationally expensive.
PBFT Algorithm
\\\`python class PBFTNode: def execute_pbft(self, request):
1. Pre-prepare
if self.isprimary: self.broadcastpreprepare(request)
2. Prepare (wait for 2f+1 matches)
if self.collectpreparevotes() >= 2*self.f + 1: self.broadcast_commit()
3. Commit (wait for 2f+1)
if self.collectcommitvotes() >= 2*self.f + 1: self.execute(request) \\\` Tolerates f failures out of 3f+1 nodes. Related: Blockchain Consciousness (2050)