We invite submissions to the 1st Workshop on Multiple Concurrent Proposers (MCP), to be held in association with Financial Cryptography 2027. Most blockchain protocols elect a single leader to propose each block, which gives that leader a monopoly over transaction inclusion and ordering and, with it, the ability to extract rents from users in the form of maximal extractable value. MCP is an active area of research that instead lets many validators propose at once. Its central promise is fair access to markets, ensuring censorship resistance and removing the last look advantage that a single proposer holds over market participants. Improved geographic decentralization and higher throughput are among the further benefits it may bring.

This workshop provides a forum for interdisciplinary engagement across consensus, cryptography, mechanism design, and empirical measurement. We welcome both theoretical and empirical work, from either industry or academia, on the design and analysis of MCP protocols as well as the implications of MCP.

Submission Guidelines

Talk (4 pages). Must include abstract, title, and speaker who will attend, in LNCS format, excluding references and appendices. Talk submissions are not anonymous and should list their authors. Please begin the title for talks with the text “Talk:”.

Paper (15 pages). Complete research papers presenting novel ideas, systems, or analysis, in LNCS format, excluding references and appendices. Paper submissions must be anonymous.

List of Topics

Topics of particular interest include, but are not limited to, the following:

• Consensus protocols with multiple concurrent proposers, including DAG-based, multi-leader, and leaderless designs
• Parallel data dissemination and data availability
• Transaction deduplication and conflict resolution across concurrent proposals
• Validator selection and proposer-set formation
• Censorship resistance and transaction inclusion guarantees
• Accountability and slashing mechanisms
• Batch and threshold encryption for mempool privacy
• Transaction fee mechanisms and payment rules under multiple proposers
• Transaction ordering and MEV under multiple proposers
• Market microstructure implications of MCP, including fair access and the removal of last look advantages
• Fee payer DoS attacks and defenses for blockchains with asynchronous execution
• Performance measurements of production blockchains
• Empirical studies of censorship, MEV extraction, and validator decentralization

Committees

Program Committee

• Alejandro Ranchal-Pedrosa (Sei Labs)
• Andrea Canidio (Category Labs)
• Aniket Kate (Purdue University & Mysten Labs)
• Bernardo Magri (University of Manchester)
• Bruno Mazorra (Flashbots)
• Burak Öz (Flashbots)
• Dahlia Malkhi (UCSB)
• Dakai Kang (Sei Labs)
• Deepak Maram (Mysten Labs)
• George Danezis (Mysten Labs & UCL)
• Giulia Scaffino (TU Wien & Common Prefix)
• Guru Vamsi Policharla (Commonware)
• Jianting Zhang (Purdue University)
• Jovan Komatovic (Category Labs)
• Joy Wang (Mysten Labs)
• Ke Wu (University of Michigan)
• Lefteris Kokoris-Kogias (Mysten Labs)
• Maja Lie (Sei Labs)
• Mallesh Pai (Tempo)
• Nico Döttling (CISPA)
• Pranav Garimidi (a16z Frontier)
• Sarisht Wadhwa (University of Michigan)
• Yann Vonlanthen (Ethereum Foundation)
• Zeta Avarikioti (TU Wien & Common Prefix)

Program Chairs

• Lioba Heimbach (Category Labs)
• Benjamin Marsh (Sei Labs & University of Portsmouth)
• Max Resnick (Anza)
• Alberto Sonnino (Mysten Labs & University College London)

Publication

Accepted papers are published in the workshop proceedings.

Venue

The conference will be held at the Accra Beach Hotel & Spa in Barbados alongside FC 27.

Contact

All questions about submissions should be emailed to mcp27chairs@protonmail.com