Bull market? Bear market? Whatever, we are building on Bitcoin! ⚡️ Major performance improvements just dropped for CLN: 🚀 5x faster SQL loads for bookkeeper 💪 Giant PSBT handling (700+ inputs) 🔒 XPAY reliability enhancements ⚙️ Optimizations for large node operations Get the full rundown and upgrade to experience the performance improvements and fixes from our fully open-source Lightning implementation.

GitHub

Release v25.09.2 Hot Wallet Guardian · ElementsProject/lightning

v25.09.2 Hot Wallet Guardian II Bookkeeper and xpay users: please upgrade! This point release includes fixes for xpay, bookkeeper and optimisations...

A huge thank you to the Lugano Plan B team, @Plan ₿ Network, PoW Space, Satoshi Spritz, and Spazio21 for hosting an incredible week! We had a great time connecting with builders, showing new tech, and celebrating the future of Bitcoin. See you all next year in Lugano. ⚡🇨🇭

The latest $128M Balancer exploit is a reminder of something fundamental: most smart contracts today rely on audit-based hope*.* Developers write complex code, auditors review it, and everyone hopes there are no hidden logic flaws. But hope isn’t assurance. --- Simplicity takes a different approach. Developed by Blockstream Research in 2017, it’s a formally verifiable language. Meaning contracts can be mathematically proven to do exactly what they’re intended to do, and nothing more. No audits are required to verify the contract is doing what it is supposed to do. --- To understand why this matters, consider what causes most DeFi hacks: - Ambiguous conditions - Unchecked assumptions - Logical edge cases that humans miss Audits catch some of these, but not all. Simplicity eliminates ambiguity at the language level. --- How does it work? Simplicity is designed to be mathematically rigorous and predictable. As a low-level functional language, it allows mechanical reasoning about behavior, with proofs verifiable before any on-chain deployment. --- General-purpose languages are great for flexibility, but that flexibility comes at a cost: ambiguity. A single unchecked assumption in a general-purpose contract can have systemic financial consequences. --- Simplicity was engineered for high-assurance financial programming, where correctness, termination, and behavior can be *proven* before deployment. Its semantics are clear, and its outcomes deterministic. --- The goal isn’t “more expressive” smart contracts. It’s contracts that can’t fail silently, because they’ve been verified to work exactly as intended. That’s the difference between general-purpose code and high-assurance engineering. --- Simplicity was launched on the @Liquid Network July 31, 2025 and has been live since. Further integrations are underway for: - AMP - Enabling verifiable issuance and asset control - Enterprise Custody Solutions (ECS) - providing proof-backed execution paths for institutional custody workflows --- Simplicity prioritizes reliability over expressiveness. Rather than expanding complexity, it establishes a verifiable foundation. --- In short: Simplicity moves smart contracting from “we think this is secure” to “we can prove it is.” The Future of Finance Runs on Bitcoin 👉 Learn more:

Simplicity

Simplicity: Next-Generation Smart Contracts for Bitcoin

Build secure, transparent Bitcoin smart contracts with Simplicity. Learn, write, and deploy powerful contracts using Simplicity and SimplicityHL.

Today marks 17 years since Satoshi Nakamoto released the Bitcoin Whitepaper — introducing a peer-to-peer electronic cash system with no trusted parties, built on proof-of-work from @Adam Back' Hashcash. This idea changed money forever. See a recreation of the moment Satoshi reached out to @Adam Back about Hashcash to cite in the Bitcoin whitepaper, an email exchange that helped lay the foundation for proof-of-work and the entire Bitcoin network. “The root problem with conventional currency is all the trust that’s required to make it work.” — Satoshi Nakamoto, Bitcoin Whitepaper Secure your stack without a trusted third party. https://store.blockstream.com/products/jade-plus The blueprint for freedom is still hosted on Blockstream servers. Reread it today and remind yourself what Bitcoin is built on. 🔗 📄.pdf

No matter who’s folding your laundry, Jade’s Blind Oracle security architecture keeps your bitcoin safe from “evil maid” attacks.

The CLN app just updated ⚡️ This official Blockstream tool lets you run a Core Lightning node with a clean, intuitive UI. It now features smoother SSO setup and simplified authentication flows. Run Lightning your way with CLN at the core. Built for operators who want full CLN power with a streamlined interface. Try it now. ⬇️

GitHub

GitHub - ElementsProject/cln-application: Official core lightning application by Blockstream

Official core lightning application by Blockstream - ElementsProject/cln-application

Our CEO @Adam Back explains how the @Liquid Network now has over $4B TVL in real-world assets like MicroStrategy and Metaplanet shares that are trading 24/7 and priced in BTC.

We’re proud to return to Lugano Plan B, Europe’s hub for those turning Bitcoin’s potential into working systems. @Adam Back will showcase Bitcoin as the base layer for global finance and the Blockstream crew will be demoing Jade in Villa Ciani and hosting workshops in Spazio21. 🧵⬇️ Hands-on self-custody starts here. Valeria Vaccaro walks through how to build and run your own Jade. Learn self-custody from the engineers behind the tech. Oct 24 · 12:00 PM · Custody Room · Spazio21 If you build on Bitcoin, you’ll want front row. @Adam Back joins Olaoluwa Osuntokun, Federico Tenga and @Stephan Livera to talk “Assets on Bitcoin” leveraging platforms like the @Liquid Network , Bitfinex, and Lightning. Oct 24 · 2:30 PM · P2P Stage · Lugano Plan B Not your keys, not your coin! Blockstream's Alessandro Sagli walks through how to manage your Bitcoin with Jade from setup to full control. 2:30 PM · Custody Room · Spazio 21 Self-custody starts with true randomness. 🎲 Join Blockstream hardware engineer Valerio Vaccaro on the Italian stage at Lugano Plan B for a live session on “Entropy Generation with Dice.” 🗓️ Oct 25 · 16:00–17:00 · Custody Room Valerio will also break down SHA256 and show how a mini-miner brings Bitcoin’s proof of work to life. 2:30 PM and 4:00PM · Mining Room · Lugano Plan B Balance shows zero? Don’t panic. Blockstream’s Alessandro Sagli walks through the most common failure modes in Bitcoin custody and how to recover your funds safely. 10:30 AM · Spazio 21 Join Jade Engineers Valerio Vaccaro and Riccardo Casatta for “Master of the Keys”. A hardware wallet multisig masterclass from innovators in the industy. Oct 25 · 2:00 PM · UTXO Room Sound money changes how companies think. @Adam Back takes the stage with Jack Mallers, Paolo Ardoino and @preston to explore “The Evolution of Corporate Treasuries: Embracing Bitcoin” Oct 25 · 2:30 PM · WAGMI Stage Your node defines your view of Bitcoin. It’s how you connect, verify, and interact with the network. Leonardo Comandini explains how to choose and configure the right setup for your stack. 2:30 PM beginners 4:00PM Advanced · Nodes Room · @Spazio21 Blockstream @Liquid Network Engineer Leonardo Comandini joins Frederico Tenga, @tiero, Bit Walt and Mattia to discus Digital assets on Bitcoin. Oct 25 · 3:30 PM · Patio · Spazio21 Italian Language Join key Core Lightning contributor and Greenlight Principal Engineer Christian Decker for a panel with Olaoluwa Osuntokun, @Roy, and John Carvalho as the delve “Inside Lightning Implementations” Moderator: @ODELL Oct 25 · 5:00 PM · P2P Stage Capital markets are moving towards tokenization on platforms like the @Liquid Network and Bitfinex Securities. @Adam Back joins Gabor Gurbacs, Jonathan Krane and Jesse Knutson to discuss how transparency and settlement shift when finance runs on Bitcoin. Oct 25 · 5:15 PM · WAGMI Stage

Packed house at the Bitcoin Capital Summit for the “Mapping the Path Forward” panel. @Adam Back with Paolo Ardoino, Willy Woo, and @preston discussing Bitcoin’s next chapter.