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Grokking DelBrag: Out-of-Band On-Chain Fraud Proofs through Circuit Garbling @ Bitcoin++ Austin
My talk at Bitcoin++ on how DelBrag protocols work, including detailed schematics and timing analysis.
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Delbrag
Delbrag is a paper explaining how garbled circuits can be applied to make BitVM style constructs fraud proofs substantially more efficient, at the cost of increased out-of-band information exchange.
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Taproot Denial of Service Bug
TL;DR: Taproot’s sighash implementation could cause blocks to take 60s or more to validate with specially crafted standard transactions.
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Fun with CSFS I
In this blog series, I’ll write up some fun uses for CSFS I’m aware of.
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CSFS Re-Keying and Laddering, Deterministic Update Rekeying, & Applications to LN-Symmetry
This is a collab post with Rearden.
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Un-FE’d Covenants
Covenants in Bitcoin represent a method to restrict how and where coins can move.
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FE'd Up Covenants
Covenants are a way of expressing restrictions on Bitcoin.
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Spookchains: Drivechain Analog with Trusted Setup & APO
This post draws heavily from Zmnscpxj’s fantastic post showing how to make drivechains with recursive covenants.
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7 Theses on a next step for BIP-119
Warning: this post assumes a great deal of context on CTV is already understood by the reader.
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A Calculus of Covenants
This originally appeared on the mailing list.
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Sapio Studio Tutorial for CTV Meeting
Other people have followed this tutorial with some success: Common sticking points include: Not building latest sapio binary before starting Not building latest sapio-studio project before starting Not having the correct clang version (>=12) brew installi…
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London Advancing Bitcoin Tutorial
Other people have followed this tutorial with some success: https://gnusha.org/ctv-bip-review/2022-02-22.log If you’re having a problem, see above log where people have had issues.
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RoadMap or Load o' Crap?
Welcome to day 27 of my Bitcoin Advent Calendar.
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The History and Future of Sapio
Welcome to day 26 of my Bitcoin Advent Calendar.
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Decentralized Autonomous Organizations (DAOs) Will Save Bitcoin
Welcome to day 25 of my Bitcoin Advent Calendar.
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POWSWAP: Oracle Free Bitcoin Hashrate Derivatives
Welcome to day 24 of my Bitcoin Advent Calendar.
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Derivatives and Options For Bitcoin
Welcome to day 23 of my Bitcoin Advent Calendar.
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NFTs Part Two: Auctions, Royalties, Mints, Generative, Game Items
Welcome to day 22 of my Bitcoin Advent Calendar.
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Packaging Sapio Applications
Welcome to day 21 of my Bitcoin Advent Calendar.
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Oracles, Bonds, and Attestation Chains
Welcome to day 20 of my Bitcoin Advent Calendar.
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Part One: Implementing NFTs in Sapio
Welcome to day 19 of my Bitcoin Advent Calendar.
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Sapio Studio Payment Pool Walkthrough
Welcome to day 18 of my Bitcoin Advent Calendar.
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A Defense of Having Fun (and maybe staying poor)
Welcome to day 17 of my Bitcoin Advent Calendar.
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Composability in Sapio Contracts
Welcome to day 16 of my Bitcoin Advent Calendar.
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Decentralized Coordination Free Mining Pools
Welcome to day 15 of my Bitcoin Advent Calendar.
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Payment Channels in a CTV+Sapio World
Welcome to day 14 of my Bitcoin Advent Calendar.
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Payment Pools / Coin Pools
Welcome to day 13 of my Bitcoin Advent Calendar.
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Congestion Control
Welcome to day 12 of my Bitcoin Advent Calendar.
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Inheritence Schemes for Bitcoin
Welcome to day 11 of my Bitcoin Advent Calendar.
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Building Vaults on Bitcoin
Welcome to day 10 of my Bitcoin Advent Calendar.
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Sapio Primer
Welcome to day 9 of my Bitcoin Advent Calendar.
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Contracting Primitives and Upgrades to Bitcoin
Welcome to day 8 of my Bitcoin Advent Calendar.
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Review of Smart Contract Concepts for Bitcoin
Welcome to day 7 of my Bitcoin Advent Calendar.
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What's Smart about Smart Contracts: Bitcoin Maxi Edition
Welcome to day 6 of my Bitcoin Advent Calendar.
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Pillars of Bitcoin: Privacy
Welcome to day 5 of my Bitcoin Advent Calendar.
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Pillars of Bitcoin: Decentralization
Welcome to day 4 of my Bitcoin Advent Calendar.
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Pillars of Bitcoin: Self Custody
Welcome to day 3 of my Bitcoin Advent Calendar.
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Pillars of Bitcoin: Scalability
Welcome to day 2 of my Bitcoin Advent Calendar.
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Day 1: Rubin's Bitcoin Advent Calendar
What says Christmas more than an Advent Calendar to count the days till Santa comes?
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CheckSequenceVerify DISCOURAGE_UPGRADABLE_NOPS Defect
The other day I was writing some tests for BIP-119 (shoutout Gloria for the detailed feedback on improving tests).
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Infrastructure Bill: It's Go Time for Radical Self Custody
TL;DR: click here to answer call to action The infrastructure bill draft has been circulating which contains language that would have massive impact for the crypto ecosystem (and Bitcoin) in the United States, and most likely globally.
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BIP-118 What Gets Hashed Chart
As a part of my ongoing review of BIP-118 I put together a chart of what gets hashed under the current proposal.
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Quantum Proofing Bitcoin with a CAT
I recently published a blog post about signing up to a 5 byte value using Bitcoin script arithmetic and Lamport signatures.
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Templates, Eltoo, and Covenants, Oh My!
If you’ve been following The Discourse, you probably know that Taproot is merged, locked in, and will activate later this November.
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CheckSigFromStack for 5 Byte Values
I recently published a blog post about covenants on Bitcoin.
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Designing Bitcoin Contracts with Sapio
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Bitcoin is DeFi Panel
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How Taproot Could Improve Bitcoin — If It Gets Adopted
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Delegated signatures in Bitcoin within existing rules, no fork required (Connector Outputs)
This originally appeared on the mailing list, and has been edited lightly for some updates in 2025.