DAG it off: Latency Prefers No Common Coins

TL;DR

Black Marlin is a novel DAG-based Byzantine atomic broadcast protocol that achieves optimal latency without relying on common coins, outperforming existing protocols in throughput and latency.

Contribution

It introduces Black Marlin, the first DAG-based protocol that avoids common coins and reliable broadcast, while maintaining optimal latency and efficiency.

Findings

Achieves 3-round latency in ideal conditions

Outperforms state-of-the-art DAG protocols in throughput

Maintains optimal communication complexity

Abstract

We introduce Black Marlin, the first Directed Acyclic Graph (DAG)-based Byzantine atomic broadcast protocol in a partially synchronous setting that successfully forgoes the reliable broadcast and common coin primitives while delivering transactions every round. Black Marlin achieves the optimal latency of 3 rounds of communication (4.25 with Byzantine faults) while maintaining optimal communication and amortized communication complexities. We present a formal security analysis of the protocol, accompanied by empirical evidence that Black Marlin outperforms state-of-the-art DAG-based protocols in both throughput and latency.