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Hackathon control board Toronto, consensus edition

building consensus

Build something real. Find collaborators, choose a challenge, ship your project, and put it in front of the bitcoin++ community.

§ Featured builds

Built in public.

Winning and featured projects from this hackathon. Explore the full gallery →

Overall winner First Place

template-watcher

Unassigned

A neutral, real-time observability dashboard for the BIP-110 soft fork debate. template-watcher answers one question no existing tool answers: which mining pools are producing BIP-110-compliant block templates without signaling for the fork - the leading indicator that a miner may be quietly positioning to switch sides.

Miner signallingbip-110consensuscompliance

GitHub Demo

Overall winner Second Place
Award winner Most Unnecessary Use Of OpenTimestamps In An Otherwise Serious Entry

Can You Hack BTC?

Unassigned

A fun game showing why Bitcoin is (basically) unhackable, with real Lightning sat rewards.

GitHub Demo

Overall winner Third Place

Bitcoin Kernel MCP

Don't let your AI agent reason about Bitcoin consensus. Let it ask the consensus engine directly: an MCP server exposing libbitcoinkernel for hallucination-free script and block validation.

consensuslibbitcoinkernel

GitHub

§ More winning builds

Honorable mentions & sponsor prizes

Award winner Honorable Mention
Award winner Best Use of BDK

BDK Compact Block Filters in BULL

Attempt to integrate BDK CBF into Bull wallet

BDKCBFKyotoPrivacyBullBitcoinWallet

GitHub Demo

Award winner Honorable Mention
Sponsor award Best use of Soapbox

BITvote

Unassigned

A nostr-based poll application to enable bitcoin-backed voting. Votes are based on nostr identity, and require a bitcoin deposit in a designated wallet the voter controls to secure the vote.

nostrvotingconsensusproposallightningsocial

Award winner Best Beginner Hack
Award winner Honorable Mention

NodeSignal

A Signal-like messaging app for Bitcoin nodes, hence the name! After researching Core vs Knots, I have come to the conclusion that we need better ways to directly and efficiently discuss consensus, and what better way to do that than through Bitcoin nodes themselves?

social-networkdecentralizednode-softwaremessagingconsensus-discussion

GitHub

Award winner Honorable Mention

Is this good for Bitcoin? Just Ask BIPS

Educational tool to learn more about consensus changing BIPS

consensusbitcoineducation

Award winner Honorable Mention

Silent Receipts

Silent Receipts lets a sender or receiver prove, or disprove, that one specific transaction paid a silent-payments address, to one verifier, using public chain data alone. No scan key, no payment history, no master key ever revealed, just a ~140-byte bundle per transaction.

silent paymentsBDKopentimestamps

GitHub Demo Slides

Award winner Honorable Mention

Crypto Proof Visualizer

#11

Visualizes cryptography proofs

Award winner Best use of Wavelength

OpenStays

Unassigned

An open-source booking engine where availability and self-custodial Bitcoin payments converge on one conflict-proof reservation state, with OpenTimestamps receipts and Wavelength signet rewards.

GitHub Demo Docs

Sponsor award Best Use of Simplicity

KISS-BDK

Unassigned

KISS-BDK pairs a BDK testnet coordinator with KISS-signer, an offline signing device, to build, verify, sign, and broadcast Bitcoin transactions entirely over QR.

BDKRustEmbedded COfflineSigning DevicePSBTQR Codessilent paymentsrbitcoin

GitHub

§ Prizes

Prize pool.

Ranked rewards for the top projects. Challenges can stack on top.

★ 1st place · grand prize

2.5M satoshis

template-watcher + bitcoin++ tix

First Place · 2.5M satoshis

★ 2nd place

1.75M satoshis

Can You Hack BTC? + bitcoin++ tix

Second Place · 1.75M satoshis

★ 3rd place

750k satoshis

Bitcoin Kernel MCP + bitcoin++ tix

Third Place · 750k satoshis

+ Additional awards

[ Award ]

Best Beginner Hack

Welcome to your first hackathon! This award is for the submission whose entire team is brand new to open source or bitcoin development. Only eligible to teams where EVERY member is a high-school/undergraduate student OR a first-time contributor to open-source bitcoin.

Prizes

bitcoin++ tix 1.6M satoshis

For each member of your team

[ Award ]

Honorable Mention

Great project that the judges thought deserved some recognition.

Prizes

bitcoin++ tix 1.6M satoshis

For each member of your team

[ Award ]

Best use of Wavelength

Wavelength is a toolkit that makes it easy to add self-custodial bitcoin payments to any application without running a Lightning node, managing channels, or sourcing liquidity. Built for both humans and AI agents, it supports sending and receiving bitcoin through a simple, flexible API. This prize will be awarded to the team with the best use of Wavelength.

The winning team will have the opportunity to showcase their project on a Lightning Labs community call, AND be joined by a Lightning Labs engineer for a one-hour vibe-coding and pair-programming session.

Prizes

1-hour Pair Programming Session 750k satoshis

Join a Lightning Labs engineer for a one-hour vibe-coding / pair-programming session on a project of your choice!

Project Showcase 750k satoshis

Showcase your project on a Lightning Labs community call!

[ Award ]

Best Use of BDK

Bitcoin Development Kit (BDK) is a library that allows you to seamlessly build cross-platform Bitcoin wallets without worrying about bitcoin internals. This prize will be awarded to the team with the best usage of BDK.

Prizes

Cash Money 1M satoshis

[ Blockstream ]

Best Use of Simplicity

Simplicity is a powerful, formally specified smart contract language designed for Bitcoin’s trust model. Live on the Liquid Network, it enables developers to build expressive, predictable, and auditable financial applications using SimplicityHL’s approachable Rust-like syntax. This prize will be awarded to the team with the most innovative use of Simplicity. Example ideas for projects include: 1. A SimplicityHL stablecoin with blacklisting functionality, and 2. Bitcoin SPV node as a SimplicityHL smart contract in Liquid.

Each member of the winning team will receive a Blockstream Jade hardware wallet.

Prizes

Blockstream Jade Hardware Wallets 1M satoshis

Each member of the winning team will receive a Blockstream Jade hardware wallet.

[ Soapbox ]

Best use of Soapbox

Soapbox builds open-source tools for social media, AI development, activism, and the decentralized web. This prize will be awarded to the team with the best use of Soapbox technology to build an open, user-owned, censorship-resistant app, community tool, or Bitcoin-enabled experience. Learn more at https://canva.link/wy5s2n45dkquwb6

Prizes

Cash Money 1M satoshis

[ Award ]

Most Unnecessary Use Of OpenTimestamps In An Otherwise Serious Entry

For the project with the most unnecessary use of OpenTimestamps in an otherwise serious entry. Powered by OpenTimestamps. Learn more at https://opentimestamps.org/

Prizes

Cash Money 42k satoshis

§ The judges

9 judges.

Scoring is handled by the assigned hackathon judges.

JUDGE #01

§ Project gallery