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Riga 2025, privacy edition
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Bitcoin++ Privacy Edition

Welcome to the Bitcoin++ Privacy Edition Hackathon!

This is the hackathon site for the bitcoin++ privacy edition hackathon in Riga, Latvia.

The main hackathon competition will be open ended (overall 1st, 2nd, 3rd). Anything involving bitcoin is fair game. Bonus points for privacy related projects.

There are optional challenges that hackers may create projects around. Submitting for a challenge is optional, and ALL projects will be considered for the main competition.

Logistics 

Thursday (8/7/25)
Kickoff Presentation: 11:45 AM (EEST UTC+3:00)
Hacking Begins: 1:15 PM
Submission Deadline: 3:15 PM - On Devpost

Report for Judging Expo: 3:30 PM
Judging Expo: 3:45 PM - 4:45 PM - MAX 3 minutes (practice & time yourself)

Friday (8/8/25)
Finalist Presentations: 11:30 AM - 12:15 PM - 5 minutes per team (main stage)
Awards & Closing: 4:15 PM

Submissions closed View project gallery → View schedule →
5M
Prize Pool (satoshis)
∞
Team size
15
Visible projects
7
Awards
§ Welcome

Welcome to the Bitcoin++ Privacy Edition Hackathon!

This is the hackathon site for the bitcoin++ privacy edition hackathon in Riga, Latvia.

The main hackathon competition will be open ended (overall 1st, 2nd, 3rd). Anything involving bitcoin is fair game. Bonus points for privacy related projects.

There are optional challenges that hackers may create projects around. Submitting for a challenge is optional, and ALL projects will be considered for the main competition.

§ Prizes

Prize pool.

Ranked rewards for the top projects. Challenges can stack on top.
★ 1st place · grand prize
2.5M satoshis
git-futz + 1st Overall — future Bitcoin++ ticket
1st Overall · 2.5M satoshis
★ 2nd place
1.5M satoshis
Spilling ecash + 2nd Overall — future Bitcoin++ ticket
2nd Overall · 1.5M satoshis
★ 3rd place
1M satoshis
git-futz + 3rd Overall — future Bitcoin++ ticket
3rd Overall · 1M satoshis
+ Additional awards
[ Award ]

ChaCha Slide Award - Best use of Cryptography

Tickets to future Bitcoin++ event - For the project with most novel, clever, or effective use of cryptography.

Prizes
ChaCha Slide Award - Best use of Cryptography — future Bitcoin++ ticket 1 satoshis

One ticket to a future Bitcoin++ event for each winning team member.

[ Award ]

Cloak & Dagger Award - Best Hack for Censorship Resistance

Tickets to future Bitcoin++ event - For the project that best thwarts surveillance, evades censorship, or empowers free expression in hostile environments.

Prizes
Cloak & Dagger Award - Best Hack for Censorship Resistance — future Bitcoin++ ticket 1 satoshis

One ticket to a future Bitcoin++ event for each winning team member.

[ Award ]

Honorable Mentions

Tickets to future Bitcoin++ event - Awarded to up to 6 “honorable mentions”.

Prizes
Honorable Mentions — future Bitcoin++ ticket 1 satoshis

One ticket to a future Bitcoin++ event for each winning team member.

[ Award ]

ROT13 Going on 30 - Best Beginner Hack

Tickets to future Bitcoin++ event - Only eligible to teams where EVERY member is a high-school/undergraduate student OR a first-time contributor to open-source bitcoin.

Prizes
ROT13 Going on 30 - Best Beginner Hack — future Bitcoin++ ticket 1 satoshis

One ticket to a future Bitcoin++ event for each winning team member.

§ The judges

9 judges.

Scoring is handled by the assigned hackathon judges and coordinators.
Benjamin Carman
JUDGE #01

Benjamin Carman

Spiral
Eric Sirion
JUDGE #02

Eric Sirion

Fedimint
Erik Cativo
JUDGE #03

Erik Cativo

Bitcoin Design Foundation / Cashu
Femi Longe
JUDGE #04

Femi Longe

Judge
Jesse Shrader
JUDGE #05

Jesse Shrader

AMBOSS Technologies
Max Hillebrand
JUDGE #06

Max Hillebrand

Cypherpunk
niftynei
JUDGE #07

niftynei

bitcoin++
Peter Todd
JUDGE #08

Peter Todd

OpenTimestamps
Super Testnet
JUDGE #09

Super Testnet

Independent
§ Overview

Build in public.

Projects stay private until organizers open the public gallery. Judges and admins can review submissions while the event is running.
Submissions closed

Welcome to the Bitcoin++ Privacy Edition Hackathon!

This is the hackathon site for the bitcoin++ privacy edition hackathon in Riga, Latvia.

The main hackathon competition will be open ended (overall 1st, 2nd, 3rd). Anything involving bitcoin is fair game. Bonus points for privacy related projects.

There are optional challenges that hackers may create projects around. Submitting for a challenge is optional, and ALL projects will be considered for the main competition.

Logistics 

Thursday (8/7/25)
Kickoff Presentation: 11:45 AM (EEST UTC+3:00)
Hacking Begins: 1:15 PM
Submission Deadline: 3:15 PM - On Devpost

Report for Judging Expo: 3:30 PM
Judging Expo: 3:45 PM - 4:45 PM - MAX 3 minutes (practice & time yourself)

Friday (8/8/25)
Finalist Presentations: 11:30 AM - 12:15 PM - 5 minutes per team (main stage)
Awards & Closing: 4:15 PM

Conference
Riga 2025, privacy edition
Timeline
TBA
View schedule →
Team size
Unlimited
§ Featured builds

Built in public.

Winning and featured projects from this hackathon. Explore the full gallery →
★ 1st Overall★ 3rd Overall

git-futz

Unassigned
Randomise timestamps in a Git commit history to prevent leaking the Time Zone of a developer.
bashgit
GitHub Docs
★ 2nd Overall

Spilling ecash

Unassigned
allow utxo ownership transfer with cashu. custodial, client enters into 2 of 2 multisig one way lightning channel with service.client gets everything back unless service claims before timelock.
bitcoinrust
Amperstrand Nakamoto
GitHub Docs
★ Cloak & Dagger Award - Best Hack for Censorship Resistance★ Honorable Mentions

Bitcoin core private broadcast end-to-end test

Unassigned
Bitcoin core PR #29415 upgrades `sendrawtransaction` with a private broadcast option. Try an end-to-end test from mobile wallet, through electrs, and out to the network via private broadcast.
proxmoxvms
Keith Mukai
Docs