Bitcoin Optech Newsletter: Major Wallet, Lightning Network, and Core Infrastructure Upgrades Boost Security and Fee Management

The unified Bitcoin Optech Newsletter coverage details a spectrum of influential technical upgrades across the Bitcoin ecosystem, including key advancements in leading Bitcoin wallets, Lightning Network implementations, and Bitcoin Core infrastructure. Notable wallet updates include Cake Wallet’s integration of Payjoin v2, enhancements to Sparrow Wallet, and Safe Wallet’s addition of CPFP fee bumping, each improving transaction efficiency and privacy. Hardware progression is highlighted by COLDCARD Q’s release and Bitkey’s newly open-sourced code. Major releases such as Bitcoin Knots 28.1, LND 0.19.0-beta (which brings robust RBF-based fee bumping), and Core Lightning 25.05rc1 have focused on fee management, scalability, and node resilience. Further, the Bitcoin Core infrastructure has strengthened credential security and advanced mempool developments. Upgrades to Core Lightning also enhance interoperability, backup robustness, and plugin architecture. Additional developer tools, such as opcodes documentation, JoinMarket simulators, and a PSBTv2 explorer, cater to ongoing protocol refinement. The newsletters emphasize that while no direct news significantly moved the market this week, these under-the-hood improvements reinforce Bitcoin’s performance, scalability, security, and infrastructure reliability. For crypto traders, the ongoing technological evolution suggests a strong foundation for the ecosystem, particularly in terms of transaction agility and network robustness.