Talks and Poster Presentations (with Proceedings-Entry):
A. Judmayer, N. Stifter, P. Schindler, E. Weippl:
"Pitchforks in Cryptocurrencies: Enforcing rule changes through offensive forking- and consensus techniques";
Talk: 2018 International Workshop on Cryptocurrencies and Blockchain Technology (CBT 2018),
Barcelona, Catalonia;
2018-09-06
- 2018-09-07; in: "Springer Data Privacy Management, Cryptocurrencies and Blockchain Technology",
Springer Lecture Notes in Computer Science,
11025
(2018),
197
- 206.
English abstract:
The increasing number of cryptocurrencies, as well as the rising
number of actors within each single cryptocurrency, inevitably leads
to tensions between the respective communities. As with open source
projects, (protocol) forks are often the result of broad disagreement. Usually, after a permanent fork both communities \mine" their own business and the conflict is resolved. But what if this is not the case? In this paper, we outline the possibility of malicious forking and consensus techniques that aim at destroying the other branch of a protocol fork. Thereby, we illustrate how merged mining can be used as an attack method against a permissionless PoW cryptocurrency, which itself involuntarily serves as the parent chain for an attacking merge mined branch of a hard fork.