BlockstreamNov 21, 2022

Tree-shaped programs like Miniscript are easy to read and analyze. Simplicity follows in these footsteps, enabling arbitrary computation using a tree, which can bring covenants, delegation, and more to Bitcoin.

Read the latest from #BlockstreamResearch:

https://blog.blockstream.com/from-miniscript-to-simplicity/

From Miniscript to Simplicity

Bitcoins are managed by computer programs that unlock funds in exchange for a valid witness. These Bitcoin scripts encode spending conditions that define what is and what is not a valid witness. Every transaction rests on this mechanism. Making sure that this works means making sure that transactions work. How

Blockstream
BlockstreamAug 19, 2022

Read the latest from #BlockstreamResearch on the development of open-source e-cash protocol @fedimint.

💾 Rebranding MiniMint to Fedimint

🧙‍♂️ Gaining developer traction

⚡️ Integrating Lightning

🌐 Signet coming soon

https://blog.blockstream.com/fedimint-update/

Fedimint Development Update

Much has happened since we last wrote about Fedimint, an open-source federated e-cash protocol co-sponsored by Blockstream that enables scalability, ease of use, and privacy by default for Bitcoin. By sponsoring Fedimint and further building out Bitcoin layer-2 infrastructure, we strengthen the case for Bitcoin as a new monetary system

Blockstream
BlockstreamJul 7, 2022

The #BlockstreamResearch team is excited to share the current progress on our research into the aggregation of signatures based on curve secp256k1, including an early draft BIP for non-interactive half-aggregation of BIP 340 Schnorr signatures. 🔏

https://blog.blockstream.com/half-aggregation-of-bip-340-signatures/

Half-Aggregation of BIP 340 Signatures

We are excited to share the current progress on our research into the aggregation of signatures based on curve secp256k1.

Blockstream
Show threadBlockstreamJun 20, 2022

8/ Elsewhere, #BlockstreamResearch and partners from @UniFAU & @CISPA proposed ROAST, a wrapper for Schnorr scheme FROST, which would scale threshold signatures in L2s like @Liquid_BTC that use a federated consensus model.

Whitepaper 👇

https://eprint.iacr.org/2022/550.pdf

BlockstreamJun 20, 2022

1/ #LAYER2ROUNDUP: Specter, Umbrel, & SideSwap share Liquid news, CLN v0.11.1, a new LND RC, Coin Corner announces The Bolt Card, & a new paper from #BlockstreamResearch on signature schemes for L2.

🧐 blog-form (more in-depth) [https://blog.blockstream.com/layer-2-roundup-june-22/]

👇 tweet-form

Layer-2 Roundup: Specter’s Liquid Issuer Extension, ROAST, and the Latest Releases in Lightning

Welcome to the inaugural long-form entry of the Layer-2 Roundup, a monthly summation of Bitcoin’s second layer, spanning new innovations and projects to protocol updates and discussions happening within the space. In this month’s issue, we cover Specter, Umbrel, and SideSwap’s new Liquid offerings, review the latest

Blockstream
BlockstreamMay 24, 2022

#BlockstreamResearch has been working on a wrapper for threshold signature schemes like FROST that guarantees a quorum of honest signers, such as @Liquid_BTC functionaries, and scales to even larger groups (tested with a 67-of-100 setup). 🔏

Learn more👇

https://medium.com/blockstream/roast-robust-asynchronous-schnorr-threshold-signatures-ddda55a07d1b

ROAST: Robust Asynchronous Schnorr Threshold Signatures

Making Bitcoin and Liquid more private and more efficient is a fundamental goal of our research efforts at Blockstream Research. One particular way to achieve this goal is to make transactions of…

Blockstream Engineering Blog
BlockstreamFeb 12, 2021
The #BlockstreamResearch team wrote about a new formally-proved fast & constant-time extended GCD algorithm that's under development for libsecp256k1 which would dramatically improve transaction signing performance and verification for #Bitcoin nodes. 🖊️ https://medium.com/blockstream/a-formal-proof-of-safegcd-bounds-695e1735a348
A Formal Proof of safegcd Bounds

Verifying a novel modular inversion algorithm using a proof assistant

BlockstreamFeb 9, 2021
In our latest #EngineeringBlog article, the #BlockstreamResearch team describes a hypothetical undetectable hardware wallet key exfiltration attack, and a new feature we've developed for #BlockstreamJade (and other HWWs) to protect users' keys. 🔐💠 https://medium.com/blockstream/anti-exfil-stopping-key-exfiltration-589f02facc2e
Anti-Exfil: Stopping Key Exfiltration

New cryptographic tech to protect users from leaking keys through hardware wallet attacks