Cryptology ePrint Archive: Report 2019/876

Kadcast: A Structured Approach to Broadcast in Blockchain Networks

Elias Rohrer and Florian Tschorsch

Abstract: In order to propagate transactions and blocks, todayís blockchain systems rely on unstructured peer-to-peer overlay networks. In such networks, broadcast is known to be an inefficient operation in terms of message complexity and overhead. In addition to the impact on the system performance, inefficient or delayed block propagation may have severe consequences regarding security and fairness of the consensus layer. Therefore, we introduce Kadcast, a novel peer-to-peer protocol for block propagation in blockchain networks. Kadcast utilizes the well-known structured overlay topology of Kademlia to realize an efficient broadcast operation with tunable overhead. As our protocol is based on UDP, we incorporate forward error correction (FEC) to increase reliability while still maintaining its lightweight protocol architecture. To this end, we build a probabilistic model to analyze Kadcastís resilience to packet losses as well as random and adversarial node failures. Moreover, we evaluate Kadcastís block delivery performance, broadcast reliability, efficiency, and security based on advanced network simulations, which confirm the merits of the Kadcast protocol.

Category / Keywords: applications / broadcast, blockchain, cryptocurrency, peer-to-peer, networking

Original Publication (with minor differences): AFT '19: Proceedings of the first ACM conference on Advances in Financial Technologies

Date: received 30 Jul 2019, last revised 30 Jul 2019

Contact author: elias rohrer at tu-berlin de

Available format(s): PDF | BibTeX Citation

Version: 20190801:132221 (All versions of this report)

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