bitcoin++ goes private

talk

Comparing Coinjoin Implementations

Peter Todd

Time

Fri, Aug 8 · 9:30 AM – 10:00 AM

Location

Main Stage

Type

talk

Duration

30m

How do the current widely used coinjoin protocols compare, and how private are they actually? We'll go through the big three: payjoin, joinmarket, and wasabi, and review what they are and what flaws they have.

Speakers

Peter Todd

OpenTimestamps

X Nostr GitHub Website

talk

The state of ecash design: progress, risks, and what’s ahead.

Erik Cativo

Time

Fri, Aug 8 · 9:30 AM – 10:00 AM

Location

Talks Stage

Type

talk

Duration

30m

The state of ecashdesin : progress, risks, and what’s ahead. Over the past few years, Cashu has gone from an experimental concept to a growing ecosystem. I want to highlight the major development breakthroughs that helped get us here, the problems we’re still solving, and what might be coming next. I’ll go over stuff like: How people are finding mints (and how tools like bitcoinmints.com + Nostr are helping) What wallets are doing to help users avoid getting rugged How we’re starting to show mint reliability through things like the mint auditor Some newer, more experimental features like multinut payments, mint authorization, and NIP 60 wallets, It’s basically a look at what’s been figured out, what’s still messy, and what’s coming next, from the perspective of a designer who is working on this day-to-day.

Speakers

Erik Cativo

Bitcoin Design Foundation / Cashu

X Nostr GitHub Website

talk

Privacy Lego: Where Does Cashu Fit in Your Bitcoin Stack?

thesimplekid

Time

Fri, Aug 8 · 9:30 AM – 10:00 AM

Location

Workshops Stage

Type

talk

Duration

30m

Bitcoin gives us sound money, Lightning brings instant payments, but where does Cashu fit? This interactive session explores Cashu's unique role in the Bitcoin ecosystem. Through hands-on examples and live demonstrations using Rust Cashu implementations, participants will discover when and why to integrate Cashu into their Bitcoin applications.

Speakers

thesimplekid

Cashu

X Nostr GitHub Website

talk

El Tor - A high bandwidth Tor network fork incentivized with Bitcoin

eltordev

Time

Fri, Aug 8 · 10:00 AM – 10:30 AM

Location

Main Stage

Type

talk

Duration

30m

Come learn about the architecture of the El Tor network! El Tor is a high-bandwidth Tor network fork, incentivized by the Bitcoin Lightning Network. Users can host El Tor relays and earn sats for sharing their bandwidth. The urgency for such a network has never been greater, especially in light of escalating privacy threats globally—from Brazil's VPN prohibition to the legal challenges faced by Telegram's Pavel Durov. El Tor aims to transcend the existing boundaries of the Tor network and to scale beyond its current limitation. The project was inspired by the cypherpunk vision for a private internet. BOLT 12 offers (with blinded paths) was the catalyst to build such a network. Lightning is used for privately paying relays out of band. A higher bandwidth and more reliable Tor network can lead to future services being launched as hidden services by default, instead of "clearnet" (or KYC'd) servers. - Read the spec here https://github.com/el-tor/eltord/blob/master/spec/00_spec.md - Technical details on paid circuits https://github.com/el-tor/eltord/blob/master/spec/01_paid_circuits.md

Speakers

eltordev

El Tor

X GitHub Website

talk

Miniscript

Ady Shimony

Time

Fri, Aug 8 · 10:00 AM – 10:30 AM

Location

Talks Stage

Type

talk

Duration

30m

Bitcoin Miniscript: The Key to Smarter Wallets

Speakers

Ady Shimony

Bitcoin

X Nostr GitHub

talk

payjoin ux challenges

Yashraj

Time

Fri, Aug 8 · 10:00 AM – 10:30 AM

Location

Workshops Stage

Type

talk

Duration

30m

payjoin ux challenges

Speakers

Yashraj

Bitcoin Design Community

X GitHub

panel

Panel: Building your privacy stack

Calle, Jeff Gardner, Walton, Super Testnet, Elias Rohrer

Time

Fri, Aug 8 · 10:30 AM – 11:30 AM

Location

Main Stage

Type

panel

Duration

1h

Speakers

Calle

Cashu

X Nostr GitHub Website

Jeff Gardner

White Noise

X Nostr GitHub Website

Walton

bitcoin++

X Website

Super Testnet

Independent

X Nostr GitHub

Elias Rohrer

Spiral

X Nostr GitHub Website

workshop

Be your own ISP - non KYC internet access

c03rad0r

Time

Fri, Aug 8 · 10:30 AM – 11:30 AM

Location

Talks Stage

Type

workshop

Duration

1h

How much of an identity do you really need in order to communicate? TollGate is a WiFi captive portal that accepts e-cash for internet access. You can buy internet access from my TollGate and resell it to someone outside of my to form a "mesh network" that doesn't require a routing algorithm. Your business decisions determine the route of the traffic. Let's try it out in the hands on workshop!

Speakers

c03rad0r

Toll Gate

Nostr GitHub

workshop

Build your own BTClock

Djuri Baars

Time

Fri, Aug 8 · 10:30 AM – 11:30 AM

Location

Workshops Stage

Type

workshop

Duration

1h

If you buy a workshop kit for EUR 150,- payable in Bitcoin (on-chain or LN), you can build your own FOSS/H BTClock during a guided building session. Depending on the available time, I could explain about how the project started and give a high overview of the hardware (15 minutes). The building itself is about 30 minutes as we created kits that only require screwing it together (no soldering required).

Speakers

Djuri Baars

BTClock (and Satsback.com)

X Nostr GitHub

hackathon

Hackathon Finals

Alex Lewin

Time

Fri, Aug 8 · 11:30 AM – 12:15 PM

Location

Main Stage

Type

hackathon

Duration

45m

Top finalists who make it out of the Expo will be invited to present their projects to compete for the top prize.

Speakers

Alex Lewin

Fedi

X GitHub Website

keynote

Cashu: Bitcoin micropayments with maximum privacy

Calle

Time

Fri, Aug 8 · 1:00 PM – 1:30 PM

Location

Main Stage

Type

keynote

Duration

30m

To come…

Speakers

Calle

Cashu

X Nostr GitHub Website

workshop

Operation ORCHESTRA 2.0 Annual Status Report

Urban Hernandez

Time

Fri, Aug 8 · 1:00 PM – 2:00 PM

Location

Talks Stage

Type

workshop

Duration

1h

A decade ago, Operation ORCHESTRA unveiled the blueprint for covert success in the technological domain—and it surpassed all expectations. Following its resounding achievements, an extension was swiftly approved to lay the groundwork for ORCHESTRA 2.0. This year's briefing will update decision-makers and program liaisons on the goals, breakthroughs, and strategies employed in the highly classified next chapter of systemic orchestration in the decentralized era.

Speakers

Urban Hernandez

escapethetechnocracy

X GitHub Website

talk

Light Clients Aren't Dead!

Robert Netzke

Time

Fri, Aug 8 · 1:00 PM – 2:00 PM

Location

Workshops Stage

Type

talk

Duration

1h

The current state of bitcoin clients outside of Bitcoin Core typically trade off speed for privacy. 2140 is attempting to bridge the gap to bring better privacy for resource-constrained applications. The talk will cover the current state of BIP 157/158 compact block filters, strategies for implementations to incorporate compact block filters to provide better privacy for their users, and ideas for future silent payments wallets built with private light clients.

Speakers

Robert Netzke

2140

GitHub Website

talk

Payjoin: Scaling is Privacy

spacebear

Time

Fri, Aug 8 · 1:30 PM – 2:00 PM

Location

Main Stage

Type

talk

Duration

30m

Privacy and Scaling are often viewed as competing goals, but they go hand in hand. The Lightning Network is arguably the most widely used privacy tool on Bitcoin, despite not being its explicit purpose. This talk re-frames Payjoin in this context.

Speakers

spacebear

Payjoin Dev Kit

X Nostr GitHub Website

talk

CISA

Fabian Jahr

Time

Fri, Aug 8 · 2:00 PM – 2:30 PM

Location

Main Stage

Type

talk

Duration

30m

- Pros and Cons of a CISA softfork (what's in the HRF Report) - Current state of proposal and implementation FWIW, I could speak longer than 20min but I like to keep it short :) But if there is still room in the schedule let me know and I can extend the content.

Speakers

Fabian Jahr

Brink

X GitHub

talk

Payment Channels and Privacy

Super Testnet

Time

Fri, Aug 8 · 2:00 PM – 3:00 PM

Location

Talks Stage

Type

talk

Duration

1h

In this workshop, you'll create and test payment channels based on the hedgehog protocol, and along the way learn how off chain transactions can improve financial privacy

Speakers

Super Testnet

Independent

X Nostr GitHub

workshop

Private Web Payments with Cashu (and nostr)

Egge

Time

Fri, Aug 8 · 2:00 PM – 3:00 PM

Location

Workshops Stage

Type

workshop

Duration

1h

In this workshop we will explore how we can utilise open networks like Cashu and nostr to create privacy preserving payment rails on the web.

Speakers

Egge

X Nostr GitHub Website

talk

Privacy issues in the Bitcredit network

Mykyta Tymko

Time

Fri, Aug 8 · 2:30 PM – 3:00 PM

Location

Main Stage

Type

talk

Duration

30m

Bitcredit main goal is to make the use of Bitcoin in the real economy possible. "Orange-pilled businesses". The protocol is based on the concept of peer to peer credit contract between companies based on a proven financial instrument such as a bill of exchange denominated in bitcoin. And further adding liquidity to bills of exchange based on ecash, with which companies will be able to pay their workers. In this talk I would like to focus on anon mode, a mode in the application that will allow businesses to remain completely anonymous.

Speakers

Mykyta Tymko

Bitcredit Protocol

X Nostr GitHub Website

talk

Privacy beyond Bitcoin

Eric Sirion

Time

Fri, Aug 8 · 3:30 PM – 4:15 PM

Location

Main Stage

Type

talk

Duration

45m

Why you should work on privacy projects that aren’t “bitcoin”. An overview of technologies and contribution opportunities that are key to building the cryptoanarchist project. * Network level privacy (e.g. Mixnets) * Paths to KYC-resistant hosting * Autonomous, self-replicating applications * Private, decentralized communities

Speakers

Eric Sirion

Fedimint

X Nostr GitHub Website

talk

Timelocks and Their Use in Recovery Solutions

Oren Zomer

Time

Fri, Aug 8 · 3:30 PM – 4:15 PM

Location

Talks Stage

Type

talk

Duration

45m

Absolute and Relative Timelocks in Bitcoin are necessary for 2nd layer solutions, but what else can we do with them? Let's dive into how timelocks operate in Bitcoin, what they can\cannot do, and how we can use them to recover our Bitcoin in case our seed was lost.

Speakers

Oren Zomer

RITREK

X Nostr GitHub Website

talk

Lessons from Building Vexl: Balancing Encryption, Anonymity, and UX in Bitcoin Apps

David Novák

Time

Fri, Aug 8 · 3:30 PM – 4:15 PM

Location

Workshops Stage

Type

talk

Duration

45m

What does it take to build a peer-to-peer Bitcoin app that truly respects user privacy—without sacrificing usability? In this talk, we’ll share lessons learned from developing Vexl, a no-KYC, client-first Bitcoin trading app. We’ll explore the technical and architectural challenges of storing encrypted data in the database, designing anonymous communication and trust models, and crafting a user experience that remains intuitive despite strict privacy constraints. If you’re building in the Bitcoin space and care about user privacy while creating apps people can actually use, this talk is for you.

Speakers

David Novák

Vexl

GitHub Website

talk

Closing Ceremony

niftynei

Time

Fri, Aug 8 · 4:15 PM – 4:45 PM

Location

Main Stage

Type

talk

Duration

30m

Speakers

niftynei

bitcoin++

X Nostr GitHub Instagram Website