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Welcome to the Devcon Event app!

Devcon is an intensive introduction for new Ethereum explorers, a global family reunion for those already a part of our ecosystem, and a source of energy and creativity for all.

Ethereum developer conference

Devcon Bogotá, Oct 11 → 14

Devcon Bogotá App

Talk 2

The Portal Network is the culmination of five years of development and research targeting lightweight access to the Ethereum Protocol.  Learn what the Portal Network is, how it works, and what it will mean for Ethereum to have a reliable decentralized network tailor made for end users to interact with the Ethereum protocol.

I am a long time core developer of the Ethereum protocol that loves to make things and tell stories.

Piper Merriam

The Portal Network

The Ethereum merge is a high-stakes event for the entire industry, and requires several large, stateful, distributed software systems to behave flawlessly in order for it to succeed. Unfortunately, it’s very difficult to develop distributed stateful systems like a blockchain with high confidence. Many of the worst bugs in these systems don’t show up in the happy case, but require particular network, hardware, or timing conditions in order to manifest.

Data nerd turned crypto enthusiast working at Antithesis to push the boundaries of finding bugs in distributed architectures.

David Searle

Will Wilson

Debugging the Ethereum Merge with Parallel Universes

The merge of the beacon-chain consensus layer with the EVM execution layer is a major milestone for Ethereum, if not the most significant. The changes introduced are also affecting testing infrastructure. It's an excellent opportunity to look at the public testnet infrastructure, compare the various networks, and present the Sepolia and Goerli testnets to teams and developers still relying on Kovan, Rinkeby, or Ropsten.

Head of Protocol Engineering and Managing Director (Germany) at ChainSafe Systems. Initiator of the Goerli Testnet Initiative and organizer of ETHBerlin. Maintainer of the open-source Ethereum Ruby and Crystal libraries.

Afri Schoedon

Post-Merge Testnets

Web3 users often sign transactions without knowing what they are doing. How can we let them take more informed decisions? Contracts verified on Sourcify (https://sourcify.dev) can be presented with human-friendly information via the ABI and the NatSpec documentation

The talk will explain how it's made possible with "Solidity contract metadata" and how Sourcify's "full verification" works. We'll also touch upon alternative approaches to how to display human-readable tx information to the users

Main Developer of the project sourcify.dev 
Ethereum Foundation

Kaan

Human-Friendly Contract Interactions

Recent updates about Solidity and plans for the future.

Daniel

Technical Details of the Solidity Compiler

The story of Alice in her journey of making her smart contract upgradeable.

She starts with a very naive approach, and quickly bumps into the fundamental problems of proxies: using CALL vs DELEGATECALL, the execution context, storage collisions, the importance of tooling, etc.

As her system grows in complexity, her proxy architecture iterates and becomes more and more sophisticated, finally arriving to a very powerful, elegant and easy to use architecture: The Router Proxy.

Die hard Etherean. 15 years in software development. 5 years in Ethereum app layer development. Creator of the Ethernaut CTF game. Founder of the EthernautDAO. Ex Aragon and OpenZeppelin. Currently core contributor at Synthetix, as well as forming devs and helping teams grow via the EthernautDAO.

Alejandro Santander

Alice in Proxyland

Transactions are stored in the blockchain as hexadecimal data. That may be ok if you are a shadowy super coder but if you are like the rest of us you just need to have them explained in English.
If there are no tools that allow decoding of those transactions then the potential of web3 can not be realized

Its crucial such tools are developed in the open, as opensource code since decoding events for different chains and protocols scale faster than what any team of developers can maintain alone

ethereum developer since 2014! Contributed to solidity compiler and c++ ethereum.
Built the DAO, saw it get destroyed, then hacked it back to save whatever we could both in ETH and ETC.
Development lead for the Raiden network.
Founder of rotki.

I like birding :D

Lefteris Karapetsas

Understanding Transactions in EVM-Compatible Blockchains Powered by Opensource

Just a quick overview of some of the new APIs and features of Ethers introduced in v6, including Typed-Values, more-flexible Contract interaction and Layer 2 enhancements.

Just another random developer from Canada, loving Ethereum and looking forward to the awesome future Blockchain has in store. Otherwise, the author of ethers and co-author of Firefly. :)

Richard Moore

Ethers: What's New in v6?

We shill an assembly SHA256 library that is optimized to compute the hash tree root of a Merkle tree. It consists of reusing two publicly available methods:
1. Hardcoding padding block. This method is used in Bitcoin's core client hashing algo. 
2. Use CPU-vectorization to hash different branches in parallell. This is Intel's "multi-buffer" method. 

Initial benchmarks show up to 1200% improvement on hashing of large lists on AVX512. 

A GoAssembly version is used by prysm.

I am a professional mathematician that temporarily happen to be a core developer at prysmaticlabs. I enjoy the types of puzzles that arise when trying to hack the protocol.

Potuz

The Right Way to Hash a Merkle Tree

zkSNARKs are becoming a cornerstone of decentralised technologies. Yet they are often considered impenetrable to newcomers. We will present an update on the ZoKrates toolbox, a set of tools aimed at making developing zkSNARK applications easier using a high-level language instead of handcrafted circuits.

Thibaut Schaeffer

A ZoKrates Update

We will share some Plonkish circuit designing patterns we learned during the zkevm development.

Chih-Cheng builds some privacy or scaling applications.

Chih-Cheng Liang

Little Things I’ve Learned in Developing Halo2 Circuits

October 2019 seems like an eternity ago, and there have been a variety of interesting, sometimes novel, and sometimes repetitive security incidents across the ecosystem since then.  We will discuss those incidents, what went wrong, how they've been resolved, and what lessons have been learned, or new mechanisms put in place, in the service of preventing a repeat.

Lane Rettig is a writer, hacker, entrepreneur, and investor deeply fascinated by the intersection of technological and social systems, and committed to architecting and building human-centric software. He's been working full time on blockchain R&D since 2017. He was formerly an Ethereum core developer, and now focuses his efforts on Spacemesh, a  a next-generation smart contract platform based on a novel consensus mechanism.

Lane Rettig

Ryan Lackey has been a cypherpunk since the early 1990s. After working on anonymous Chaumian blinded electronic cash and dropping out of MIT, he moved to the Caribbean to build his first startup. Co-founder of the world's first offshore datahaven, HavenCo, he also has worked as a war-zone defense contractor, founded a YC-funded startup to Cloudflare, and is now Chief Security Officer of Evertas, the first dedicated cryptoasset insurance company.

Ryan Lackey

Investing in the infrastructure and tools needed to build the Network State. Previously co-founded Mosendo DAI wallet, PowerTrade options exchange, and DeFi Nation community. DAOs: MetaCartel, RaidGuild, Synthetix, UMA

Tom Howard

Arun Devabhaktuni

Notable security incidents since Devcon V

Often cited virtues of blockchains are immutability, transparency, decentralization, openness, and trustlessness. Many also think of their most natural applications as financial. Yet a critical affordance of such systems is often missed: the way they are uniquely suited to facilitate cooperation. Here I show how via CK and DVPs.

Shrey Jain is a Web3 researcher at Microsoft under Glen Weyl where he focuses his research on identity, coordination, and machine learning.

Shrey Jain

Working Towards a Plural Public via Common Knowledge and Designated Verifier Proofs

Many DAOs have adopted Oracle based tools to make gassless votes executable. I demonstrated an exploit of one such oracle that was possible because the other users on the oracle app were undercapitalized or not paying attention. This type of attack highlights the weaknesses and risks of many assumptions people have about the attention span of DAO members, and execution conditions. I will show common misconfigurations of tools that are the most risky, and show people how they can fix them.

Isaac Patka is a developer and founder in the DAO space. He is a core developer in the Moloch Mystics building Moloch v3, and a member of DAOHaus where he built DAO composability tooling to enable Moloch v2 DAOs to directly control Gnosis Safes through Zodiac modules. He is the co-creator of Logos, a framework-agnostic DAO furthering the adoption of Web3 governance in IRL communities.

Isaac Patka

Exploiting Inattention & Optimism in DAOs

Marius joined the Ethereum Foundation in 2020 to work on go-ethereum. He's interested in fuzzing, testing and shipping The Merge. He wrote his master thesis on differential fuzzing of EVMs where he found 3 critical consensus issues.

Marius van der Wijden

Member of the go-ethereum team. Maintains several specifications, including `ethereum/execution-apis`. Co-author of EIP-3074.

lightclient

Geth team, interfacing between research and engineering. Interested in evolutions to the Ethereum protocol.

Guillaume Ballet

Péter Szilágyi

Geth Team AMA

A brisk jaunt through the state of the art in Solidity editor tooling, a tour of Nomic's Solidity Language Server and how we can take Solidity editor support to the next level.

Programmer and team lead at the Nomic Foundation.

John Kane

Better Solidity Support in VSCode by Hardhat

We’ve been pumping up Remix with new tools & features for users of all levels.  Come learn the latest Remix tricks & techniques.  We'll cue up editor improvements, tool integrations (including Git), Remix shortcuts, and our new workflows. We’ll also demo our new interface for using Remix with proxy contracts.  This talk will take your scratchings on Remix to 11.

Rob Stupay is managing communications at Remix.

Rob Stupay

What's new in Remix

Oracles continue to fuel the growth of the Ethereum and layer-2 ecosystem. To build dApps that serve real-world use cases, from DeFi and DAOs to NFTs and beyond, Ethereum developers need access to secure oracle networks. In this session, we will dive into the latest oracle innovations and showcase new capabilities that enable Ethereum developers to build the scalable, secure, and feature-rich applications that can achieve widespread adoption.

Lorenz Breidenbach is the Head of R&D at Chainlink Labs. He is a security researcher and former BRIDGE fellow from ETH Zürich and IC3.  He's been working on Ethereum-adjacent research since 2017 on projects such as Flashboys 2.0, libsubmarine, GasToken.io, and "Enter the Hydra".

Lorenz Breidenbach

Improving Oracle Infrastructure on Ethereum

Join this talk to get an introduction to Decentralized Programable Key Pairs (PKPs), by Lit Protocol.

PKPs are 'distributed custody cloud wallets' that act as a personal compute platform that can write to a variety of state machines (e.g Ethereum, IPFS) because they are 'smart contracts with a secret' that can make arbitrary HTTP requests and use that data in the computation.

David Sneider is the co-founder at Lit Protocol, a network for decentralized compute, encryption, and access control.

David Sneider

Chris got started in crypto in 2011 and created the first commercially available hardware wallet in 2013, Piper Wallet.  He co-founded Lit Protocol to democratize access to threshold cryptography and bring freedom through math.

Chris Cassano

Decentralized Programmable Key Pairs

A Web3.py maintainer steps though how to use some of the lesser-known features recently released: async functionality, off-chain data lookups, plugin support and more.

Developer at the EF since 2017 working on the Mist Browser, Grid, and now the Python team maintaining Web3.py and creating educational resources.

Marc Garreau

Little-known Web3.py

Time in PoW is a random process, whereas in PoS we make progress in fixed time intervals. This has far reaching implications and incentivizing timely behavior by validators is non-trivial - especially in the context of MEV.

Researcher @ Ethereum Foundation, Robust Incentives Group

Caspar Schwarz-Schilling

Time in Ethereum - on the implications of replacing our dear friend Poisson

We at Status have been working to enable an interface to Web3 since our inception. We bought into the principles of this ecosystem, and have spent extraordinary effort to not compromise on those ethics while we continue to create applications that are easily accessible while also maintaining our user's rights. 

This talk is an overview of this journey, lessons learned, the fruits of this labor, why we're doubling down on this process, and why you should to.

Dr. Corey Petty started his blockchain focused research around 2012 as a personal hobby while doing his PhD candidacy at Texas Tech University in Computational Chemical Physics. He then went on to co-found The Bitcoin Podcast Network and still serves as a host on Hashing It Out. Corey entered the data science/blockchain security industry for a few years attempting to fix vulnerabilities in ICS/SCADA networks before transitioning to Status as Chief Security Officer. Now he works on infrastructure

Corey Petty

How to Ethically Build Public Good Infrastructure

Ethereum Foundation

Hold - Temporary

We need more mainstream users to partake in Etheruem PoS activity, 

A brief talk showcasing stake tooling for Ethereum deposit contract that allows a normal user to safely stake 32 ETH and have his/her Ethereum Validator from 0, this includes generating credentials and processing deposit, another 60 seconds will allow them to have a node up and running using DVT techstack.

Ethereum Proof of stake Fanboy 

https://blog.blockswap.network/eth2stakinganddaovalidators-ce7e72bbe63f

matt shams

Under 2 Min - Become an Ethereum Staker and Set Up Node

We highlight two challenges of parallel execution on Ethereum: 1. Historical data shows that data dependencies force us to execute a large portion of transactions serially. 2. If we assign incentives to scheduling decisions, this might introduce non-determinism that the system cannot tolerate. In this lightning talk, we present these two problems and outline some proposed solutions.

Note that this work was accepted for and presented at ICSE'22 (https://bit.ly/3HzPKZT)

I'm a web3 enthusiast, interested in both dapp development and low-level protocol engineering.

Péter Garamvölgyi

Challenges of Parallelizability under Ethereum's Execution Model

Ethereum consensus pyspec (https://github.com/ethereum/consensus-specs) is an executable specification that serves as a reference for consensus layer devs. It is also used for creating the test case vectors for client teams.

In this lightning talk, we will have a tutorial on how to run the Ethereum consensus pyspec. And bonus, learn how to write a test by yourself!

Hsiao-Wei Wang

How to use Executable Consensus Pyspec

Peter Davies gives an overview of the work of the EELS (Ethereum Execution Layer Specifications) team on the [new executable specifications](https://github.com/ethereum/execution-specs) for the Ethereum execution layer. He discusses why new specifications are needed and how they will impact future governance processes.

I am an independent Ethereum researcher (currently funded by the Ethereum Foundation). Most of my work is on the next generation [Execution Layer Specifications](https://github.com/ethereum/execution-specs).

Peter Davies

EELS: The Future of Execution Layer Specifications

The talk seeks to address the following questions:

- Why does PBS matter from CL's point of view? What happens if we completely ignore it on the protocol layer? What if we wait to release it?
- How did we implement hybrid PBS on CL clients from history to functional products?
- What do they look like in code?
- What are the gotchas and the trade-offs?
- What are the remaining questions we shall seek before moving to full PBS?

👋 Hi, I'm a core dev at Prismatic labs. I'm most known for my work on Prysm, a consensus layer client written in Go. I mostly worked on the proof of stake Ethereum, known as the beacon chain. Lately, I've been working extensively on "the merge", hybrid PBS, and eip4844.

Terence Tsao

Hybrid PBS from CL's Perspective

This talk gives an overview of the networking infrastructure of beacon nodes and details some of the recent research being done significantly reduce the growing bandwidth requirements of the Ethereum consensus layer.
In particular, we will discuss the network requirements of gossipsub, how long-lived subnets can be the cause and a potential solution to high bandwidth usage as well as preliminary results from experiments with an experimental extension to the gossipsub protocol, episub.

Adrian is a co-founder and director of Sigma Prime. He has a background in physics but has spent the last few years working on the Ethereum consensus protocol, building the Lighthouse client. He is primarily focused in the networking aspects of the client and the protocol.

Adrian Manning

I've been working with sigp for two years and a half in networking land and very happy to join

Diva

Reducing Beacon Chain Bandwidth for Institutional and Home Stakers

Lodestar is the newest production-ready consensus client, written entirely in TypeScript.

How did we do it? How did we go from buggy, slow, and scared to agile, confident chads?
Metrics, metrics, metrics!

We will introduce the concept of metrics-driven development in the context of blockchain node development and give fun examples where metrics saved our hide, time and time again.

Ethereum core developer working on Lodestar at ChainSafe

Cayman Nava

Lodestar: Metrics-Driven Development

We all use open source, it is the wealth of the commons that forms the foundations we all build on. While this is incredibly empowering, we may be inviting the devil to dine with us. This talk examines software supplychain attacks in the javascript and crypto ecosystems and how to keep your app, wallet, and users safe. We'll look at the free and opensource tool LavaMoat that protects MetaMask.

kumavis founded MetaMask and now leads their Security Research team. Contributor to MetaMask, LavaMoat, Endo, SES, Ethereumjs, js-libp2p.

Kumavis

Full-stack developer and technology researcher. JS Security Engineer at MetaMask working on LavaMoat and Endo. Started using Node.js at v0.8 and never stopped. Enjoys innovating and teaching security, diagnostics and maintainability. One of the oldest members of meet.js Poland community - both as a speaker and organizer.

Naugtur

The Attacker is Inside: Javascript Supplychain Security and LavaMoat

Smart contract security audits have become a de facto requirement for Ethereum applications. However, there continue to be multi-million dollar hacks every week highlighting significant challenges with audits such as questionable quality, arguable effectiveness, unreasonable expectations, high cost, low availability and dearth of talent. This panel proposes to debate on these contentious aspects with some leaders in this space and peek into their crystal ball to see if we are REKT or WAGMI.

Jonathan Alexander is CTO of OpenZeppelin and co-founder of Forta. He leads the global development team at OpenZeppelin that works on OpenZeppelin Contracts, Wizard, Defender, and Forta. Formerly he was CTO at Tricentis and Vonage Business. When not working on software he likes spending time with his family, reading, tennis, and mountain hiking.

Jonathan Alexander

Gonçalo, currently co-founder of the ConsenSys Diligence team, has 20+ years of experience in offensive security.
Notable achievements range from cracking DRM algorithms to breaching a major international consumer electronics retailer.

While studying Aerospace engineering, Gonçalo also built 3 startups (AdTech, BioTech, Mobile). Passionate about turning MVPs into production-ready products, he has also mentored a fair share of entrepreneurs in the past 5+ years.

Gonçalo Sá

Nick Selby

Mehdi Zerouali is a co-founder and Director of Sigma Prime, a leading Sydney-based blockchain security company. Mehdi has been in the information security industry for 10 years and has performed hundreds of security assessments targeting critical infrastructure. With Sigma Prime, Mehdi applies his skills to the Blockchain space, helping prominent projects secure their decentralised protocols.

Mehdi Zerouali

Chandrakana Nandi

Security at Optimism. 
Previously co-founder of ConsenSys Diligence.

Maurelian

Future of Smart Contract Security Audits: REKT or WAGMI?

Solidity has quite a long history already, especially in terms of "crypto years". Yet, the project has not yet reached the "magical" 1.0 release.

This talk is discussing what the language could look like reaching 1.0; and going beyond reaching 2.0.

Alex is the team lead of Ipsilon at the Ethereum Foundation, a group focused on improving the EVM.  Alex has been an early contributor and co-lead of the Solidity team.

Alex Beregszaszi

What would Solidity 1.0 and 2.0 look like?

How symbolic computation in EVM / Solidity works, end-to-end. I'll try to give insights on problems that can be solved efficiently, forming constraints, relaxations, how to build custom solvers from scratch, and produce computer proofs. We'll be saving gas!

Hari

Symbolic Computation for Fun and for Profit

Geth comes with a variety of ways to analyze the execution of past and constructed transactions. In addition to the collection of built-in tracers, users can submit scripts in JavaScript or Go which hook to the EVM, receiving minute events such as "opcode executed" or "entered new call frame". In the workshop, the audience can follow along a summary of basic tracing, commonly faced problems, as well as an introduction to the more recently shipped features and how to write efficient tracers.

I work on the go-ethereum client, with a focus on tracing, the JSON-RPC as well as GraphQL APIs.

Sina Mahmoodi

EVM Tracing in Geth

EVM assembly can be quite opaque and intimidating at first glance.  In this talk we'll take a look at exactly how EVM assembly works under the hood while analyzing some common functionality we see in smart contracts - as well as showing some optimization techniques you can use by jumping down to assembly in your solidity contracts.

Alex has been in crypto since 2017 and currently works as a senior software engineer Thesis where he is working on a decentralized and fully-open-source web3 wallet.  He has previously worked in high frequency trading in the TradFi world as well as a centralized cryptocurrency exchange.

Alex Bazhenov

EVM - Some Assembly Required

Substreams is a powerful, parallelizable, blockchain data indexing technology, developed within The Graph.
It enables truly composable indexing, with shared modules written in Rust, both in batch and in streaming. It reaches unbeforeseen performances by virtue of its parallel design that supports both mappers and stateful store modules.
In this session, we will see how Substreams solve indexing for all blockchain protocols.

Alexandre, a trained classical pianist, now father of 8, started programming at age 12. He discovered Bitcoin in 2013 and launched the first Canadian Bitcoin payments processor. He continued to become a prolific data scientist and open-source advocate, only to come back to blockchain to build high-performance data solutions in the space.

Alexandre Bourget

Introducing The Graph Substreams for High-Performance Indexing

Five years ago, at DevCon in Prague, EY took the wraps off Nightfall, our open source public domain approach to privacy. Now it's live on Ethereum as a layer 2 privacy-enabled ZK-optimistic roll-up solution called Polygon Nightfall.  That's only half the story though - we also need private smart contracts.  This talk will cover our roadmap to that end, including our newest tool in development (also open source) called Starlight.

Paul Brody is the global blockchain leader at EY (Ernst & Young).  For the last seven years, he has championed the use of public blockchains and open systems for enterprise users and the need for privacy.  EY is the only major professional services company focused on the Ethereum ecosystem and committed to public blockchains.

Paul Brody

Chaitanya is an applied cryptography researcher working in EY's Blockchain R&D. She built Nightfall which is a zero knowledge proof based privacy solution for transferring tokens with privacy. She then worked to decrease the cost of these transactions further, one of the approaches to solve this lead to Nightfall 3, an optimistic zk solution for private transfers of tokens. Along with Polygon, she led the efforts to deploy Nightfall 3, also called Polygon Nightfall, to Ethereum mainnet in May 22

Chaitanya Konda

Scaling Privacy with Starlight

How to prove that you donated to Gitcoin grants or that you voted for a specific DAO proposal without giving out your Ethereum address? 

How to aggregate your reputation from multiple wallets?

Built as a new primitive, ZK Badges enable you to: 
- Import reputation from an account to another
- Selectively reveal personal data
- Aggregate your personal data from multiple accounts

dhadrien

ZK Badges: A new primitive for self sovereign identities

Eth EOAs and token standards (ERC20/721/1155) are terrible for end-user privacy. Can we build an alternative to them that preserves the existing functionalities while providing meaningful anonymity and privacy? This talk explores the functionality requirements of Eth user accounts, such as asset use authorization, asset & identity provenance, what privacy means in the areas of DeFi, NFTs, and identity, as well as concrete ways to build such an ecosystem.

Wei Dai is a Cryptographer at Bain Capital Crypto. He is **not** the inventor of b-money, who the unit of Ethereum and the Maker stablecoin is named after. Nevertheless, he aspires to contribute enough to the R&D of blockchains so that he may one day become "the Wei Dai."

Wei Dai

Software Security Engineer at the Privacy & Scaling Explorations Team

Kyle Charbonnet

Towards a Feature-Complete and Backwards-Compatible Privacy Layer for Ethereum

Historically, cryptographic protocols have been built special-purpose for specific kinds of claims or information hiding mechanisms. zkSNARKs and other new cryptographic tools move us to a world of "general-purpose" cryptography, where we have expressive languages to express claims about digital identity, reputation, and more. We discuss a high-level framework for thinking about where and why ZK and related technologies might (or might not) be useful for digital applications.

gubsheep is the creator of Dark Forest and runs applied ZK research and development at 0xPARC.

gubsheep

ZKPs and "Programmable Cryptography"

Leader of EthColombia and Community Supporter at Devcon.

Juan David Reyes

Ethereum Event Showcase

The merge unlocks a new era of truly light clients that can stay in sync with the Ethereum network using just 20 bytes / second. All obtained data can be verified in a trust-minimized manner, reducing the risk of a rogue centralized API provider serving incorrect data. This talk describes the latest advancements in CL light client protocols.

Etan Kissling

Light Clients After the Merge

In this talk the various techniques that some L1s and L2s use to provide EVM and RPC compatibility with end user and developer tooling will be examined. Special attention will be paid to features (address aliasing and expansion, RPC handing of system contracts, account abstraction) of other blockchains that Ethereum developers have discussed with an eye towards the compatibility issues they introduce.

Danno Ferrin is Principal Software Engineer at Hedera Hashgraph, where he spearheads the smart contract environment in the Hedera network. Previously he was Lead Protocol Engineer at ConsenSys Software Inc on their Ethereum Mainnet team, where he chose to go "full crypto" after leaving Google.

Danno is a maintainer for the Hyperledger Besu project, and sits on the Hyperledger Technical Steering Committee, where he is Vice Chair.