Paper 2024/1189
The Espresso Sequencing Network: HotShot Consensus, Tiramisu Data-Availability, and Builder-Exchange
Abstract
Building a Consensus platform for shared sequencing can power an ecosystem of layer-2 solutions such as rollups which are crucial for scaling blockchains (e.g.,Ethereum). However, it drastically differs from conventional Consensus for blockchains in two key considerations: • (No) Execution: A shared sequencing platform is not responsible for pre-validating blocks nor for processing state updates. Therefore, agreement is formed on a sequence of certificates of block data-availability (DA) without persisting them or obtaining blocks in full. At the same time, the platform must stream block data with very high efficiency to layer-2 entities for execution, or (in the case of rollups) for proof generation. • Builder-Exchange: A shared sequencing platform delegates to external entities to build blocks and separates it from the role of a consensus proposer. This allows an ecosystem of specialized builders to pre-validate transactions for diversified rollups, languages, and MEV exploits. However, separating the task of block-building from proposing brings a new challenge. Builders want assurances that their blocks would commit in exchange for revealing their contents, whereas validators/proposers want assurance that the data in committed blocks will be available and fees paid. Neither one trusts the other, hence the shared sequencing platform should facilitate a “fair-exchange” between builders and the sequencing network. The Espresso Sequencing Network is purpose-built to address these unique considerations. Among the main novelties of the design are (i) a three-layered DA system called Tiramisu, coupled with (ii) a costless integration of the DA with the platform’s consensus core, and (iii) a Builder-Exchange mechanism between builders and the consensus core. Note that this paper relies substantially on and can be seen as an extension of The Espresso Sequencer: HotShot Consensus and Tiramisu Data Availability [84].
Note: Minor update.
Metadata
- Available format(s)
-
PDF
- Category
- Cryptographic protocols
- Publication info
- Preprint.
- Keywords
- consensusdata-availabilityblockchainfair-exchange
- Contact author(s)
-
jeb @ espressosys com
benedikt @ espressosys com
philippe @ espressosys com
binyi @ espressosys com
ellie @ espressosys com
ben @ espressosys com
brendon @ espressosys com
gus @ espressosys com
fernando @ espressosys com
chengyu @ espressosys com
dahlia @ espressosys com
kartik @ espressosys com
keyao @ espressosys com
alex @ espressosys com
nathan @ espressosys com
sishan @ espressosys com - History
- 2024-08-14: last of 2 revisions
- 2024-07-23: received
- See all versions
- Short URL
- https://ia.cr/2024/1189
- License
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CC BY
BibTeX
@misc{cryptoeprint:2024/1189,
author = {Jeb Bearer and Benedikt Bünz and Philippe Camacho and Binyi Chen and Ellie Davidson and Ben Fisch and Brendon Fish and Gus Gutoski and Fernando Krell and Chengyu Lin and Dahlia Malkhi and Kartik Nayak and Keyao Shen and Alex Xiong and Nathan Yospe and Sishan Long},
title = {The Espresso Sequencing Network: {HotShot} Consensus, Tiramisu Data-Availability, and Builder-Exchange},
howpublished = {Cryptology {ePrint} Archive, Paper 2024/1189},
year = {2024},
url = {https://eprint.iacr.org/2024/1189}
}
