Proud to be a founding member of the @BTCconsortium. Bitcoin’s long-term security has always been core to what we do, from open-source research to practical post-quantum work like OP_CHECKSHRINCS. Supporting the independent developer community that keeps the network resilient is a natural extension of that mission.

Today, the best quantum hardware can just about factor 21 (3 x 7). Blockstream Research hired Mikhail Kudinov, one of the cryptographers behind NIST's post-quantum signature standard, and we have already proposed OP_CHECKSHRINCS, an optimized hash-based signature opcode for Bitcoin. How we are making Bitcoin post-quantum secure:

Blockstream

OP_CHECKSHRINCS: A Hash-Based Signature Opcode for Post-Quantum Bitcoin

OP_CHECKSHRINCS is a proposed Bitcoin opcode for post-quantum signatures whose security rests on SHA-256, the hash function Bitcoin already uses.

New 0-conf infrastructure for Liquid and other Blockstream Elements - based deployments is here. Swap services, exchanges and other applications that accept Liquid payments now have access to near-instant transfer times. More in the technical explainer. 👇

Blockstream

0-Conf for Elements and Liquid: A Technical Explainer

New 0-conf infrastructure for Liquid and other Elements-based deployments is here. As a Blockstream-operated service, it aggregates mempool visibi...

Managing a Lightning node used to mean living in the command line. The Core Lightning app puts your channels, fees, and peer control in one screen. Your node, your rules. Core Lightning runs at home in one click on @Umbrel ☂️ or @Start9. Run the app from source:

GitHub

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

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

Everyone you've orange-pilled is still leaving their coins on an exchange. The best way to teach self-custody is to hand someone the keys. Jade Core makes it a five-minute conversation, not a lecture. Bring someone in this week. https://store.blockstream.com/products/blockstream-jade-core

Hashcash, invented by @Adam Back, is cited in the Bitcoin whitepaper. Yet in 2013, watching bitcoin pass $100, he thought he had missed the boat. Own your bitcoin from day one. Download the Blockstream app:

Blockstream: Bitcoin and digital asset infrastructure

Blockstream App: A multi-platform, feature-rich Bitcoin and Liquid Wallet.

Blockstream app guides you from your first bitcoin purchase to full self-custody, all inside one elegant, security-first Bitcoin experience.

Everyone you've orange-pilled is still leaving their coins on an exchange. The best way to teach self-custody is to hand someone the keys. Jade Core makes it a five-minute conversation, not a lecture. Bring someone in this week https://store.blockstream.com/products/blockstream-jade-core @Leo_Usi.blossom.band/e07ff6681c18ef8338073ef644563ff4b76addb986818d163286387ad912e066.jpg" alt="image" loading="lazy">

OP_CHECKSHRINCS uses one public key with two ways to spend. The first path keeps signatures small by having the device track how many times it has signed. The second path doesn't track anything and is always available as a safety net. If your device is lost or replaced, you restore with your recovery phrase and fall back to that second path. It's more expensive to spend from, but you are never locked out. This is how SHRINCS works. Read about the OP_CHECKSHRINCS opcode put forward by Blockstream Research and what it means for Bitcoin's post-quantum security:

Blockstream

OP_CHECKSHRINCS: A Hash-Based Signature Opcode for Post-Quantum Bitcoin

OP_CHECKSHRINCS is a proposed Bitcoin opcode for post-quantum signatures whose security rests on SHA-256, the hash function Bitcoin already uses.

Reusing a bitcoin address links your transactions and weakens your privacy. The Blockstream app gives you a fresh receive address every time, and your funds stay in self-custody from the moment you buy. Take back your privacy. Download the Blockstream app:

Blockstream: Bitcoin and digital asset infrastructure

Blockstream App: A multi-platform, feature-rich Bitcoin and Liquid Wallet.

Blockstream app guides you from your first bitcoin purchase to full self-custody, all inside one elegant, security-first Bitcoin experience.

OP_CHECKSHRINCS uses one public key with two ways to spend. The first path keeps signatures small by having the device track how many times it has signed. The second path doesn't track anything and is always available as a safety net. If your device is lost or replaced, you restore with your recovery phrase and fall back to that second path. It's more expensive to spend from, but you are never locked out. This is how SHRINCS works. @Leo_Usi.blossom.band/49740ad2a9d86f9a2cd7912199400cfe94aa91fa1569cedb88f9b1a9050f3995.gif" alt="image" loading="lazy"> Read about the OP_CHECKSHRINCS opcode put forward by Blockstream Research and what it means for Bitcoin's post-quantum security:

Blockstream

OP_CHECKSHRINCS: A Hash-Based Signature Opcode for Post-Quantum Bitcoin

OP_CHECKSHRINCS is a proposed Bitcoin opcode for post-quantum signatures whose security rests on SHA-256, the hash function Bitcoin already uses.

"Buy the dip and hodl. Don't get shaken out." - @Adam Back

Most people buy bitcoin first and secure it later. With Jade paired to the Blockstream app, every purchase lands straight in offline cold storage, secured by your hardware wallet from the very first transaction.

Self-custody got a reputation for being hard. Jade Core is here to end it. Serious protection for your bitcoin, with a setup simple enough that "I'll do it later" stops being a reason. https://store.blockstream.com/products/blockstream-jade-core

An unconfirmed transaction isn't lost, it's waiting its turn in the mempool, and the fee you paid is its place in line. In a hurry? Bump the fee in the Blockstream app to move up the queue.

Spending on the @Liquid Network is going near-instant. 0-conf brings safe-to-act-on transfers, now in public beta with a full release around the corner. And with the issuance cap removed, issuers can mint stablecoins and other Issued Assets at real-world scale. The full Liquid roadmap is in our Q2 update.

Blockstream

Blockstream Quarterly Update - Q2 2026

From a proposed post-quantum opcode to a reimagined Jade lineup and a Liquid roadmap with dates, here's what Blockstream shipped in Q2 2026.

Today, losing your hardware wallet is fine. Your recovery phrase gets you back in. In a post-quantum signing setup, the device also holds state: a running count of how many times it has signed. That state matters for security. SHRINCS is designed so that if the device is lost, the recovery phrase loads into a new one and falls back to a path that needs no state at all. The fallback needs no state, so a lost device is never a lost wallet. More expensive to spend from, but always accessible. Blockstream Research Director Jonas Nick on building a post-quantum scheme that stays safe even when hardware fails:

Blockstream

OP_CHECKSHRINCS: A Hash-Based Signature Opcode for Post-Quantum Bitcoin

OP_CHECKSHRINCS is a proposed Bitcoin opcode for post-quantum signatures whose security rests on SHA-256, the hash function Bitcoin already uses.

Getting off an exchange shouldn't be hard. Jade Core is the simplest way to hold your own bitcoin, built for anyone taking self-custody for the first time. @Adam Back on the thinking behind it.

Satoshi chose secp256k1 for Bitcoin’s cryptography. Jonas Nick and Blockstream Research are among the co-maintainers of libsecp256k1, the library every Bitcoin node runs to implement it. Researching what comes next is a natural extension of that work.

Turns out you don't need to wave a device at a webcam, tape over your laptop camera, or set up in a windowless room to take self-custody of your bitcoin. Jade Core keeps it simple: plug in, back up, transact, done. https://store.blockstream.com/products/blockstream-jade-core

The Blockstream Explorer API is home to one of the fastest ways to sync a Bitcoin wallet. With QuickSync, you send one descriptor and get the complete history back in a single response. Grab an API key and see it for yourself. 🔗

Blockstream Explorer