Pizza Day Prague 2024

Even the more than 100 Opcodes in Bitcoin script as of today were not enough for the ZeroSync devs!
Therefore, we introduce the Tree++ language for more advanced Bitcoin scripts that carry state over multiple transactions and our riscV-compatible BitVM built on top of it.
Together we will explore Bit Commitments, Tree++, BitVM and Connector Outputs to eventually fuse them together in a Bridge design that allows trust-reduced sidechain peg-outs.

In this workshop, participants will receive free credits fo hosting on host4coins and learn how to install self-hosted versions of popular tools. Nextcloud, Cryptpad and Jitsi are a few examples of what participants will learn to install and run. A laptop with internet connection is required to participate and access to a registered domain name to point at the server is a plus. Linux command experience is strongly recommended. SSH key is mandatory.

Chaumian Ecash, a pioneering technology from the early 80s, promised unparalleled transactional privacy within the fiat banking system. Despite its speed, reliability, and efficiency, it never fulfilled its promise and ended up as a footnote in the history of digital currencies. Join me as we unravel the mysteries behind Ecash. This talk isn't just a history lesson; it's a forward-looking exploration of how ancient cryptography can shape the future of privacy in our digital world.

The famous pizza transaction was at the time when Bitcoin was pure gambling. But a speculation? We are all speculating with almost every decision we do. People dismiss Bitcoin because of volatility, but volatility and risk are not the same thing. A guide through assets your bankers try to sell you and why only a gambler would want them… And how to turn Bitcoin into the most conservative asset you can actually own.

In this workshop, we will bridge our beloved sats from Bitcoin to the Citrea and see how they can be utilized in decentralized applications. We will deploy a simple smart contract to Citrea and interact with it using our non-custodial wallet.

Workshop focused on Liana, a miniscript-enabled Bitcoin wallet. Delve into its unique features and security model. Understand the benefits of using a miniscript-enabled wallet and the design trade-offs that come with self-custody.

During the workshop, we'll navigate Bitcoin regtest transactions, enabling you to practice and understand the intricacies of securely managing your Bitcoin assets using Liana and understanding of the nuances of secure self-custody.

Asking the hard questions because it's easy to in front of this crowd without getting cancelled like Vlad on the birdapp.

This is the only presentation where you can throw tomatoes

On March 27th 2024, I recorded an interview with Roger Ver. It went viral!

Over the next few days, presumed friends started a character assassination campaign, former enemies tried to befriend me, and real friends told me to stay away from the internet for a while.

In spite of it all, I came out stronger than ever. WTF?!

With Samourai Wallet founders arrested and servers seized, what does it mean for the users of the wallet?

ZK Rollups are the ultimate scaling solution for Bitcoin. They create consistent fee revenue for miners through data availability and trustlessly scales BTC beyond Bitcoin with validity proofs.

We often get hung up on definitions of layers and everything wants to be a "Layer 2" these days. This talk will go into my thoughts why this is misguided and how instead we should be emphasizing the properties we care about and try to optimize for them instead of some fancy marketing term.

I will share my Bitcoin story including various Bitcoin Pizza moments from 2009-2011 when I worked with Satoshi, maintained bitcoin.org, bitcointalk.org and bitcoinexchange.com. Today my Bitcoin journey continues with Nostr development — I'll tell you how it's going and why I believe Nostr is an essential part of the "decentralize everything" stack.

New Bitcoin L2s claim to scale Bitcoin’s throughput with minimal trust assumptions. But when you dive deeper, the trust models for these scaling solutions aren’t any different than federated (and custodial) ecash application modules. On this panel, a rollup curious host will quiz the panelists on the trust assumptions related to different ecash implementations to learn if building rollup-like systems is even worth it.

Activate the Bitcoin Economy: sBTC is a 1:1 Bitcoin-backed asset that will allow developers to leverage the security, network effects, and .5T in latent capital of the Bitcoin network.

Exploring the concept of trust in systems as it relates to human interaction and how this can shape our understanding of proposals (scaling and otherwise) around Bitcoin.

Simplicity is a language to express spending conditions of coins. It replaces Bitcoin script and enables basically every scaling solution in existence. Simplicity's runtime is formally verified, which raises the bar for security on Bitcoin. You can build a lot while not burning your bitcoin in the process.
Let's see how Rust devs can write Simplicity using Simfony, a new high-level language. Let's run Simfony on your laptop / phone using the new web IDE. The future is now!

As far as the political spectrum is concerned, the libertarians and (crypto)anarchists, who have believed in crypto as non-state money from the beginning, are currently the ones who are (and will be) the richest thanks.

Rich people can change society the most thanks to capital.

Does the fact that crypto is going to the moon mean that there will be many wealthy and influential libertarians (like never before) and that society will become freer because of it?

In this presentation, we'll explore the crucial role of privacy in the infrastructure of base layer money. Specifically, we'll examine the privacy challenges faced by Bitcoin and the current solutions in place. Additionally, we'll delve into proposed remedies and discuss the ideas that Wasabi crew have in mind for Bitcoin privacy by using WabiSabi.

Undeterred by the absence of their comrade Ketominer, Polto and Darko, the remaining guardians of the Trinity's sacred knowledge, resolved to carry on. They improvised, adapting to their new reality like true cryptographic chameleons. Their quest for innovation and education could not be halted. Enter Openoms, the illustrious crypto alchemist, known far and wide for his wizardry with open-source magic.

The reformed duo—now a trio once more—announced an impromptu yet grand workshop: "Multisig with Various Hardware Wallets."

Hands on demo of the Raspiblitz software running on a laptop, Raspberry Pi 4 and 5.
Discuss custom installations and the usage of existing parts.

Workshop focused on the Specter DIY as a hardware wallet solution. Explore the world of hardware wallets, focusing on the unique features, QR code communication, and security models of the Specter DIY. Understand the design trade-offs that come with self-custody and the benefits of using a hardware wallet solution like Specter DIY. We'll navigate Bitcoin regtest transactions, enabling you to practice and understand the intricacies of securely managing your Bitcoin assets using the Specter DIY.

A diverse set of L2 technologies are emerging on Bitcoin. Various flavors of rollups settling on Bitcoin are enabling more complex and scalable computation. The experience of a diversified layer 2 ecosystem is what the Ethereum community has been embracing for the past few years and learned a lot over time. Let's reflect on this experience to see how Bitcoin can do better, not to repeat some of Eth's mistakes, and discuss ideas for the future.

Bitcoin L2s are all the talk of Bitcoin Twitter, but do these new projects actually inherit Bitcoin security, and do they really scale Bitcoin? In this talk, we'll work through a proposed risk analysis framework for Bitcoin scaling solutions and how the ecosystem should think about L2 definitions and security models.

Learn how Super Testnet's hedgehog protocol simplifies second-layer payments while also enabling offline receiving

Bitcoin rollups are limited by Bitcoin's on-chain data throughput. However, different types of L2s on the tradeoff space, such as validiums and optimiums, can use higher throughput off-chain data availability solutions such as Celestia, via the Blobstream bridge. Such solutions could also be deployed as L3 appchains on Bitcoin L2 rollups that use Bitcoin for DA, to extend the capacity of L2 rollups. This talk explores the design space and tradeoffs for using off-chain data availability.