Bitcoin Core: 28.1

Date: April 2026 (contextualized for this paper’s release) Version Focus: Bitcoin Core 28.1 Author: [Generated for informational purposes] Abstract Bitcoin Core 28.1 represents a significant maintenance and feature release in the Bitcoin protocol’s reference implementation. Building on the foundational changes of version 28.0, this point release introduces critical bug fixes, performance optimizations, memory pool (mempool) policy improvements, and enhanced peer-to-peer (P2P) protocol robustness. This paper provides a deep dive into the architecture of Bitcoin Core 28.1, analyzing its transaction relay mechanism, validation logic, fee estimation improvements, and security patches. We also examine the release’s impact on node operators, miners, and wallet users, as well as its alignment with long-term Bitcoin scalability and decentralization goals. 1. Introduction Bitcoin Core is the primary software client that powers the Bitcoin network. As of early 2026, version 28.1 is the latest stable release in the 28.x series. Unlike major version bumps (e.g., 27.0 → 28.0), point releases such as 28.1 focus on stability, bug fixes, and minor feature backports, but they often include subtle changes that affect transaction propagation, fee market dynamics, and security posture.

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