Lewis Tseng

BBB: Make Benchmarking Blockchains Configurable and Extensible

2019

Interest in Blockchain technology gradually developed after Bitcoin was introduced in 2008, and has grown exponentially as Blockchain can be applied in many scenarios that require coordination among parties that do not typically trust each …

Enabling Pervasive Federated Learning using Vehicular Virtual Edge Servers

2021

Recent works have proposed various distributed federated learning (FL) systems for the edge computing paradigm. These FL algorithms can assist pervasive applications in various aspects, e.g., decision making, pattern recognition, and behavior prediction. Existing solutions …

Longest-chain Attacks: Difficulty Adjustment and Timestamp Verifiability

2023 · arXiv (Cornell University)

We study an adversary who attacks a Proof-of-Work (POW) blockchain by selfishly constructing an alternative longest chain. We characterize optimal strategies employed by the adversary when a difficulty adjustment rule alà Bitcoin applies. As time …

Poster: Timestamp Verifiability in Proof-of-Work

2023

Various blockchain systems have been designed for dynamic networked systems. Due to the nature of the systems, the notion of "time" in such systems is somewhat subjective; hence, it is important to understand how the …