Paper 2020/1101
NC-Max: Breaking the Security-Performance Tradeoff in Nakamoto Consensus
Ren Zhang, Dingwei Zhang, Quake Wang, Shichen Wu, Jan Xie, and Bart Preneel
Abstract
First implemented in Bitcoin, Nakamoto Consensus (NC) is the most influential consensus protocol in cryptocurrencies despite all the alternative protocols designed afterward. Nevertheless, NC is trapped by a security-performance tradeoff. While existing efforts mostly attempt to break this tradeoff via abandoning or adjusting NC's backbone protocol, we alternatively forward the relevance of the network layer. We identify and experimentally prove that the crux resides with the prolonged block propagation latency caused by not-yet-propagated transactions. We thus present a two-step mechanism to confirm only fully-propagated transactions, and therefore remove the limits upon NC's performance imposed by its security demands, realizing NC's untapped potential. Implementing this two-step mechanism, we propose NC-Max, whose (1) security is analyzed, proving that it provides stronger resistance than NC against transaction withholding attacks, and (2) performance is evaluated, showing that it exhausts the full throughput supported by the network, and shortens the transaction confirmation latency by 3.0 to 6.6 times compared to NC without compromising security. NC-Max is implemented in Nervos CKB, a public permissionless blockchain.
Metadata
- Available format(s)
-
PDF
- Category
- Cryptographic protocols
- Publication info
- Published elsewhere. Minor revision. NDSS 2022
- DOI
- 10.14722/ndss.2022.24370
- Keywords
- Nakamoto Consensusproof-of-work
- Contact author(s)
- ren @ nervos org
- History
- 2022-01-28: last of 3 revisions
- 2020-09-15: received
- See all versions
- Short URL
- https://ia.cr/2020/1101
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2020/1101,
author = {Ren Zhang and Dingwei Zhang and Quake Wang and Shichen Wu and Jan Xie and Bart Preneel},
title = {{NC}-Max: Breaking the Security-Performance Tradeoff in Nakamoto Consensus},
howpublished = {Cryptology {ePrint} Archive, Paper 2020/1101},
year = {2020},
doi = {10.14722/ndss.2022.24370},
url = {https://eprint.iacr.org/2020/1101}
}