Briefing
The core research problem is the systemic threat Maximal Extractable Value (MEV) poses to blockchain consensus stability, as economic incentives for transaction manipulation override protocol security guarantees. This paper introduces the MAD-DAG protocol, which incorporates a novel MAD ledger function that fundamentally changes the incentive structure by completely discarding the transaction content and fees of blocks on a contested chain when a tie-breaking rule is invoked. This mechanism directly negates the economic advantage gained from selfish mining or rushing blocks, providing a stronger, consensus-level defense against MEV and ensuring the protocol’s security relies solely on honest behavior.
Context
Established Proof-of-Work and current Directed Acyclic Graph (DAG) consensus mechanisms are vulnerable because they treat MEV as a transparent, yet unmanageable, side-effect of transaction fees, leading to the “selfish mining” problem. Prevailing mitigation strategies, such as burning transaction fees, failed to account for the opaque nature of MEV itself, allowing rational actors to still profit from block withholding and reordering, thereby compromising the network’s liveness and security under adverse conditions.
Analysis
The MAD-DAG protocol operates on a Directed Acyclic Graph structure, but its innovation lies in the MAD ledger function. This function fundamentally differs from previous approaches by modifying the canonical ledger selection rule to destroy the economic value of a contested block. Conceptually, when the network encounters a tie (e.g. two chains of equal length), the protocol flags the contested blocks as “destructed” and completely removes their transaction and MEV content from the canonical ledger. This action ensures the malicious actor who attempted to gain an advantage by withholding a block receives zero economic reward, eliminating the profit motive that underpins all forms of MEV-driven consensus attacks.
Parameters
- MEV-Driven Selfish Mining Disincentive → Strictly eliminated by discarding block content. This is a stronger measure than fee burning, which fails to account for opaque MEV.
- MAD Ledger Function Action → Destructs red blocks on contested chains. This ensures zero transaction fees or MEV are received by the block producer.
Outlook
This foundational work on consensus-integrated MEV mitigation opens a new research avenue for designing incentive-aligned decentralized systems from first principles. The MAD ledger function provides a blueprint for future protocols to eliminate economic attack vectors at the core data structure level. This theoretical breakthrough could lead to a new generation of high-throughput DAG-based blockchains that are provably secure against rational block manipulation within the next three to five years.
Verdict
The MAD ledger function represents a foundational theoretical shift, proving that MEV-driven consensus instability can be eliminated by strategically destroying the economic incentive.
