ā Understand Byzantine Fault Tolerance
Master PBFT phases, fault tolerance math, and enterprise blockchain consensus
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0 / 5 completedš PBFT: Key Takeaways
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Byzantine Fault Tolerance
- ā¢Tolerates malicious nodes
- ā¢Requires n = 3f + 1 total nodes
- ā¢Up to f nodes can be faulty
- ā¢Mathematically proven safety
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Three-Phase Protocol
- ā¢Pre-Prepare: Primary broadcasts
- ā¢Prepare: Replicas vote on order
- ā¢Commit: Final commitment
- ā¢Reply: Execute and respond
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Performance Benefits
- ā¢Instant finality
- ā¢High throughput (1000+ TPS)
- ā¢Low latency (milliseconds)
- ā¢Energy efficient
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Enterprise Focus
- ā¢Permissioned networks
- ā¢Known validator set
- ā¢Regulatory compliance
- ā¢Real-world production use
Quick Reference
| Property | PBFT Value |
|---|---|
| Consensus Type | Byzantine Fault Tolerant |
| Minimum Nodes | n = 3f + 1 (e.g., 4 for f=1) |
| Quorum Size | 2f + 1 votes required |
| Finality | Instant (deterministic) |
| Throughput | 1,000-10,000+ TPS |
| Network Type | Permissioned (known validators) |
| Message Complexity | O(nĀ²) per consensus round |
| Examples | Hyperledger Fabric, Tendermint, Zilliqa |
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Strengths
- ā¢ Provably secure Byzantine fault tolerance
- ā¢ Instant finality - no waiting for confirmations
- ā¢ High throughput for known validator sets
- ā¢ Low energy consumption
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Limitations
- ā¢ Requires permissioned network (not anonymous)
- ā¢ Scales poorly with large validator sets
- ā¢ Communication overhead O(nĀ²)
- ā¢ Not suitable for fully public blockchains
š§ Test Your Knowledge
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