75 citations · 148 across the 5 of their papers we have counts for
7 papers
On countable elementary free groups
Olga Kharlampovich, Christopher Natoli
We prove that if a countable group is elementarily equivalent to a non-abelian free group and all of its abelian subgroups are cyclic, then the group is a union of a chain of regul…
A Retrospective Analysis of User Exposure to (Illicit) Cryptocurrency Mining on the Web
Ralph Holz, Diego Perino, Matteo Varvello +6
In late 2017, a sudden proliferation of malicious JavaScript was reported on the Web: browser-based mining exploited the CPU time of website visitors to mine the cryptocurrency Mon…
Non--homogeneity in free groups
Olga Kharlampovich, Christopher Natoli
We prove that non-abelian free groups of finite rank at least 3 or of countable rank are not -homogeneous. We answer three open questions from Kharlampovich, Myasnikov, an…
Deconstructing Blockchains: A Comprehensive Survey on Consensus, Membership and Structure
Christopher Natoli, Jiangshan Yu, Vincent Gramoli +1
It is no exaggeration to say that since the introduction of Bitcoin, blockchains have become a disruptive technology that has shaken the world. However, the rising popularity of th…
Evaluating the Red Belly Blockchain
Tyler Crain, Christopher Natoli, Vincent Gramoli
In this paper, we present the most extensive evaluation of blockchain system to date. To achieve scalability across servers in more than 10 countries located on 4 different contine…
The Balance Attack Against Proof-Of-Work Blockchains: The R3 Testbed as an Example
Christopher Natoli, Vincent Gramoli
In this paper, we identify a new form of attack, called the Balance attack, against proof-of-work blockchain systems. The novelty of this attack consists of delaying network commun…