Schmidty
@bitschmidty
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Funding Bitcoin node security, testing, and maintenance @bitcoinbrink Blocking and tackling at @bitcoinoptech
Joined September 2018
Review and test (non-trivial) changes: Kernel API Cluster Mempool BIP 54 Fuzzing & related infra Anything milestoned for v31.x Pick an issue labelled “CI Failed” and debug the non determinism. Core has too many changes in flight, and not enough consistent, high quality review.
What would I need to do in order to be considered a voice worth considering when it comes to Bitcoin Core discussions? This is a real question. I'm a technical person. I can read and write code. I've done it in the past. My career has taken me to other places, where I
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Thank you, @bitcoinhodlco! "We have chosen Brink as the first recipient of our grant and investment programme for a simple reason - the security, stability and ongoing strength of the Bitcoin protocol is absolutely fundamental not just to our own business, but also to Bitcoin
B HODL (AQUIS: $HODL | FRA: F5S) is pleased to announce it has issued its first grant under the Company’s Industry Support initiative. The first grant is made to @bitcoinbrink, a donation-funded team strengthening the Bitcoin protocol through research and development.
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B HODL (AQUIS: $HODL | FRA: F5S) is pleased to announce it has issued its first grant under the Company’s Industry Support initiative. The first grant is made to @bitcoinbrink, a donation-funded team strengthening the Bitcoin protocol through research and development.
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Bitcoin Optech newsletter #384 is here: - discloses vulnerabilities in LND - describes a project for running a virtual machine in an embedded secure element - summarizes changes to services/client software - summarizes popular Q&A from Stack Exchange - Optech Newsletter #384
bitcoinops.org
This week’s newsletter discloses vulnerabilities in LND and describes a project for running a virtual machine in an embedded secure element. Also included are our regular sections describing changes...
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Join @murchandamus and I in 30 minutes for Q&A
Murch (@murchandamus) and I cover a lot of Bitcoin technical developments on the @bitcoinoptech podcast each week. But there is a lot going on in Bitcoin that we don’t cover. What are you curious about? Drop a question below and join us for a Twitter/X Space tomorrow and we will
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Murch (@murchandamus) and I cover a lot of Bitcoin technical developments on the @bitcoinoptech podcast each week. But there is a lot going on in Bitcoin that we don’t cover. What are you curious about? Drop a question below and join us for a Twitter/X Space tomorrow and we will
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The injustice in the Samourai Wallet case is appalling. The SDNY is operating as a rogue district that is wrongfully attacking builders who follow the rules while building privacy tech. @POTUS, it would be shameful if Keonne and Bill spend a day in prison.
TFTC 692 w/ @keonne: "Bitcoin can advance human freedom or become a surveillance panopticon that enslaves us." We discuss: ⚡️ The case for a pardon ⚡️ DOJ's war on privacy ⚡️ Why miners are next
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Moonsettler (@4moonsettler) and Julian (@_julian256_) joined Optech to discuss Newsletter #383: News ● Consensus bug in NBitcoin library (1:04) Changing consensus ● LNHANCE soft fork (24:00) ● Benchmarking the varops budget (5:09) ● SLH-DSA (SPHINCS) post-quantum
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We just published "Hash-based signatures for Bitcoin," a new analysis of post-quantum schemes by @kudinov_mikhail and myself at @blksresearch. This paper serves as a gentle intro to hash-based schemes and explores how to optimize them specifically for application in Bitcoin. 🧵
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BIP54: Consensus Cleanup
64 Byte Transactions A 64 byte Bitcoin transaction has the potential to be confused with an intermediate hashing step in Bitcoin’s Merkle tree, because this is also 64 bytes. We explore how this vulnerability can be exploited & look at a proposed fix https://t.co/eTu2XiDXFv
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64 Byte Transactions A 64 byte Bitcoin transaction has the potential to be confused with an intermediate hashing step in Bitcoin’s Merkle tree, because this is also 64 bytes. We explore how this vulnerability can be exploited & look at a proposed fix https://t.co/eTu2XiDXFv
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A first release candidate for Bitcoin Core v30.1 has been tagged. A number of bugfixes have been backported to the newly available IPC interface, as well as various other changes. Guix builds have started, and binaries will be available soon.
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Lets peek into some day to day Bitcoin Core development work "cross-architecture non-determinism producing a difference in assembly code related to __builtin_dynamic_object_size, only occurring with FORTIFY_SOURCE=3 (not =2), and the first difference in compilation occurs during
Another case of cross-architecture non-determinism. Running a Windows cross-compiler, on x86_64 and aarch64, produces this difference in assembly, from the following (minified) code. Running on riscv matches x86_64. Noticed while updating our release compiler from GCC 13 to 14.
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Bitcoin Optech newsletter #383 is here: - describes a fixed vulnerability affecting the NBitcoin library - summarizes the LNHANCE soft fork proposal - relays a call to action to benchmark Bitcoin script execution under GSR's varops budget - highlights discussion of optimizations
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Interested in contributing to Bitcoin Open Source Software? The ₿OSS Challenge 2026 just opened up for applications! Previous ₿OSS participants who have completed the challenge have been funded to work on: Bitcoin Core Core Lightning Payjoin Silent Payments FROST LDK LDK
The ₿OSS Challenge is back 🎉 Start your career in bitcoin open source software (₿OSS) and change your life forever. https://t.co/ViLMvz1gvK
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Mark “Murch” Erhardt (@murchandamus), Gustavo Flores Echaiz (@gustavojfe), and Mike Schmidt (@bitschmidty) discuss Newsletter #382: News ● Stats on compact block reconstructions updates (0:34) ● Motion to activate BIP3 (7:26) Selected Q&A from Bitcoin Stack Exchange ● Do
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Yesterday we launched a full stack @StratumV2 web deployer for developers who want to spin up Pool and miner side apps locally. Would love feedback from devs and anyone comfortable with CLI. Anything unclear? What sucks, what can be better? https://t.co/uhuVw7rzZ9
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If you’ve ever donated to Brink, you should scrutinise how we’re spending your funds. We’re working hard to maintain the Bitcoin codebase, and expanding our security and maintenance efforts. We’re raising to fund more fuzzing engineers and infra; now’s a great time to donate.
Brink’s 2024 Annual Financial Report Brink recently completed our 2024 accounting audit and IRS Form 990 filing. Using that information, we have compiled Brink’s 2024 annual organizational and financial report.
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