Majorum: Ebb-and-Flow Consensus with Dynamic Quorums
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866911358030708736 |
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| author | D'Amato, Francesco Saltini, Roberto Tran, Thanh-Hai Vonlanthen, Yann Zanolini, Luca |
| author_facet | D'Amato, Francesco Saltini, Roberto Tran, Thanh-Hai Vonlanthen, Yann Zanolini, Luca |
| contents | Dynamic availability is the ability of a consensus protocol to remain live despite honest participants going offline and later rejoining. A well-known limitation is that dynamically available protocols, on their own, cannot provide strong safety guarantees during network partitions or extended asynchrony. Ebb-and-flow protocols [SP21] address this by combining a dynamically available protocol with a partially synchronous finality protocol that irrevocably finalizes a prefix.
We present Majorum, an ebb-and-flow construction whose dynamically available component builds on a quorum-based protocol (TOB-SVD). Under optimistic conditions, Majorum finalizes blocks in as few as three slots while requiring only a single voting phase per slot. In particular, when conditions remain favourable, each slot finalizes the next block extending the previously finalized one. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_03862 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Majorum: Ebb-and-Flow Consensus with Dynamic Quorums D'Amato, Francesco Saltini, Roberto Tran, Thanh-Hai Vonlanthen, Yann Zanolini, Luca Distributed, Parallel, and Cluster Computing Dynamic availability is the ability of a consensus protocol to remain live despite honest participants going offline and later rejoining. A well-known limitation is that dynamically available protocols, on their own, cannot provide strong safety guarantees during network partitions or extended asynchrony. Ebb-and-flow protocols [SP21] address this by combining a dynamically available protocol with a partially synchronous finality protocol that irrevocably finalizes a prefix. We present Majorum, an ebb-and-flow construction whose dynamically available component builds on a quorum-based protocol (TOB-SVD). Under optimistic conditions, Majorum finalizes blocks in as few as three slots while requiring only a single voting phase per slot. In particular, when conditions remain favourable, each slot finalizes the next block extending the previously finalized one. |
| title | Majorum: Ebb-and-Flow Consensus with Dynamic Quorums |
| topic | Distributed, Parallel, and Cluster Computing |
| url | https://arxiv.org/abs/2601.03862 |