## Blockchain Consensus Mechanisms: A Primer for Supervisors (2025 Update)

_IMF Working Papers, September 19, 2025_

## Source details

**Canonical URL:** [Blockchain Consensus Mechanisms: A Primer for Supervisors (2025 Update)](https://www.imf.org/en/publications/wp/issues/2025/09/19/blockchain-consensus-mechanisms-a-primer-for-supervisors-2025-update-570531)

## Other formats

- [Markdown version](/en/publications/wp/issues/2025/09/19/blockchain-consensus-mechanisms-a-primer-for-supervisors-2025-update-570531/index.md)
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## Bibliographic details
- Authors: Parma Bains
- Published: September 19, 2025
- Series: IMF Working Papers
- DOI: https://doi.org/10.5089/9798229024815.001

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### Overview
- Purpose: Provide an update to the Fintech Note "Blockchain Consensus Mechanisms: A Primer for Supervisors (2022)" by reviewing the growth of existing consensus mechanisms, exploring new consensus mechanisms, and the development of layer 2 protocols.
- Audience: Supervisors and regulatory authorities; non-technical and accessible to provide a broad understanding of the technology within supervisors' remits.
- Core premise: Consensus mechanisms underpin the effective operation of blockchains by ensuring a single consistent and honest ledger; their design and implementation can improve or impede the ability of regulatory and supervisory authorities to achieve their objectives and mandates.

### Major themes and content scope
- Review of existing consensus mechanisms, including BFT consensus and Nakamoto consensus.
- Exploration of new consensus mechanisms (examples and specific mechanisms are examined in the paper).
- Development and implications of layer 2 protocols for scalability and supervision.
- Intersection with smart contracts and Distributed Ledger Technology (DLT).
- Emphasis on supervisory implications rather than deep technical details.

### Key subjects and keywords covered
- Subjects: Blockchain and DLT, Emerging technologies, Smart contracts, Technology
- Keywords: BFT consensus, bitcoin, blockchain, Blockchain and DLT, blockchain Conensus mechanism, blockchain consensus mechanism, consensus, crypto, digital, Distributed ledger technology, dlt, Emerging technologies, ethereum, fintech, Global, layer2, Nakamoto consensus, Smart contracts, solana, supervision, tower BFT

### Intended takeaways for supervisors (enumerated)
- Understanding how different consensus mechanisms affect ledger finality, decentralization, and security.
- Awareness that design choices in consensus mechanisms can either facilitate or complicate regulatory and supervisory objectives and mandates.
- Recognition of the growing ecosystem: new consensus variants and layer 2 protocols change the supervisory landscape and may require updated approaches.
- Need for non-technical conceptual familiarity so supervisors can engage with technologists, regulated firms, and policy counterparts.

*Parma Bains, September 19, 2025*

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## Content in this bundle

- **Working Paper**
  - [Working Paper (Markdown version)](/-/media/files/publications/wp/2025/english/wpiea2025186-source-pdf.pdf.md){rel="alternate" type="text/markdown"}
  - [Working Paper (PDF)](/-/media/files/publications/wp/2025/english/wpiea2025186-source-pdf.pdf){rel="external" type="application/pdf"}

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_Source: https://www.imf.org/en/publications/wp/issues/2025/09/19/blockchain-consensus-mechanisms-a-primer-for-supervisors-2025-update-570531_