  Blockchains are appealing technologies with various applications ranging from
banking to networking. IOTA blockchain is one of the most prominent blockchain
specifically designed for IoT environments. In this paper we investigate the
convergence of IOTA consensus algorithms: Fast Probabilistic Consensus and
Cellular Consensus, when run on top of various topologies. Furthermore, we
investigate their resilience to various types of adversaries. Our extensive
simulations show that both Cellular Consensus and Fast Probabilistic Consensus
have poor convergence rates even under low power adversaries and have poor
scaling performances except for the case of Watts Strogatz topologies. Our
study points out that the design of IOTs dedicated blockchains is still an open
research problem and gives hints design.
