DAG-BFT vs Chain-BFT: The Essential Architectural Split

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This entry sits under systems index. Read it with fintech index for adjacent context and Smart Contract Bytecode Forensics — Three-Tier Verify Technique for the broader system boundary.

[!info] TL;DR Modern BFT consensus algorithms split into 2 major schools: Chain-BFT (HotStuff / Tendermint / Threshold Simplex / Malachite) chains blocks, while DAG-BFT (Narwhal / Bullshark / Mysticeti) promotes the mempool to a first-class consensus citizen. The essential split is not performance, but how the mempool is abstracted — Chain-BFT is suitable for settlement scenarios (audit-friendly), while DAG-BFT is suitable for high-throughput scenarios (100k+ TPS). Tempo and Arc both adopt Chain-BFT.

Comparison of the 2 major schools:

Why Tempo and Arc chose Chain-BFT:

1. Audit-friendly: in settlement scenarios, auditability is required for each transaction 1 件, and unfolding DAG history is too complex
2. TPS is already sufficient: stablecoin settlement does not require 100K+ TPS (Visa globally is about 24K TPS)
3. High academic maturity: the papers and implementations of HotStuff and Tendermint have both been validated at large scale
4. Formal specification verification is easier to implement: Malachite + Quint co-design is more direct under the Chain-BFT system

Scenarios where DAG-BFT is advantaged:

• High-TPS L1s such as Sui / Aptos (contrast with Global Dex Major Five Comparison on each company’s L1 rollout)
• Solana-like designs (PoH + Tower BFT is DAG-flavored)
• Future AI agent micropayment scenarios (millions of sub-cent transactions per second)

Academic frontier:

• Mysticeti (Sui, 2024): achieves sub-second finality with DAG-BFT
• Bullshark (2022, Aptos / Sui): formalizes the first-class mempool idea
• Threshold Simplex (2025, Tempo): engineering convergence of Chain-BFT + BLS aggregation
• Malachite (2025, Arc): Chain-BFT + Quint formal verification paradigm

Paper index:

• HotStuff: Yin et al. 2019 (https://arxiv.org/abs/1803.05069)

• Narwhal & Bullshark: Spiegelman et al. 2022

• Mysticeti: Babel et al. 2024

• Threshold Simplex: Tempo blog / Paradigm research

• Malachite: Informal Systems 2025

Application decision framework:

• Settlement / clearing → Chain-BFT (contrast with institutional chains’ preference for linear auditability in protocol renewal trigger)
• Games / high frequency → DAG-BFT
• General-purpose L1 → either can work (depending on ecosystem goals)

Related

• Wiki Index
• Threshold BFT consensus Rust implementation trend
• Economics of day-1 integration for quantum-resistant signatures

Sources

• HotStuff: BFT Consensus in the Lens of Blockchain (Yin et al. 2019) — https://arxiv.org/abs/1803.05069

• Narwhal and Tusk: A DAG-based Mempool and Efficient BFT Consensus (Danezis et al. 2022) — https://arxiv.org/abs/2105.11827

• Bullshark: DAG BFT Protocols Made Practical (Spiegelman et al. 2022) — https://arxiv.org/abs/2201.05677

• Mysticeti: Reaching the Limits of Latency with Uncertified DAGs (Babel et al. 2024) — https://arxiv.org/abs/2310.14821

• Malachite — Flexible BFT consensus engine in Rust (Chain-BFT implementation adopted by Arc) — https://github.com/informalsystems/malachite

• Tempo official site (Chain-BFT settlement L1 / Threshold Simplex) — https://tempo.xyz/