This paper proposes RepuCoin, the first system to provide guarantees even when more than 50% of the system's computing power is temporarily dominated by an attacker. RepuCoin defines a miner's power by its reputation as a function integrated over the entire blockchain, rather than through its sheer computing power which can be obtained relatively quickly and temporarily. As an example, after a single year of operation, RepuCoin can tolerate attacks compromising 51% of the network's computing resources, even if such power stays maliciously seized for almost a whole year.
Moreover, RepuCoin provides better resilience to known attacks, compared to existing PoW systems, while achieving a high throughput of 10000 transactions per second.
Category / Keywords: applications / Blockchain; cryptocurrency; blockchain consensus. Date: received 2 Mar 2018 Contact author: j yu research at gmail com Available format(s): PDF | BibTeX Citation Version: 20180305:160327 (All versions of this report) Short URL: ia.cr/2018/239 Discussion forum: Show discussion | Start new discussion