Leo Alt @leonardoalt Twitter profile | Pikagi

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Leo Alt

@leonardoalt

3,674

Followers

457

Following

143

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@powdr_labs @ethereum @SpearbitDAO

Berlin, Germany

Joined June 2018

Don't wanna be here? Send us removal request.

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@leonardoalt

Leo Alt

1 year

I'm extremely excited to start this new journey, especially with friends, to solve some of the most fun problems in the ZK space. Lots of cool things incoming!

@powdr_labs

powdr labs

1 year

Introducing 𝑝𝑜𝑤𝑑𝑟, a modular stack for zkVMs! Earlier this year, @ethchris , @vanderkriek & @leonardoalt started the 𝑝𝑜𝑤𝑑𝑟 project to improve zkVM tooling. With the continued support from the @ethereum Foundation, the team will soon become 𝑝𝑜𝑤𝑑𝑟 𝑙𝑎𝑏𝑠. More ↓

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@leonardoalt

Leo Alt

3 years

I know that I show nothing

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@leonardoalt

Leo Alt

2 years

Let JS unite us all 🤝🤝

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@leonardoalt

Leo Alt

3 years

rendering mid-post-lisbon crypto twitter

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@leonardoalt

Leo Alt

2 years

Oh the 0.4.24 days...

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@leonardoalt

Leo Alt

2 years

There you go @maurelian_ The way to use errors in @solidity_lang depends on your alignment, so please follow this

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@leonardoalt

Leo Alt

2 years

Just joined the Foundry contributooors club. Foundry now has direct access to @solidity_lang 's model checker via `foundry.toml` 1/n

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@leonardoalt

Leo Alt

3 years

It's been too long since we last bashed upgradeability

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@leonardoalt

Leo Alt

3 years

The EF's Formal Verification and Applied ZKP teams are together looking for someone to work on FV of Zero Knowledge apps! If you're going to EthCC we can also chat in person about it.

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Formal Verification Researcher/Engineer - Zero Knowledge Applications - HackMD

# Formal Verification Researcher/Engineer - Zero Knowledge Applications ## Ethereum Foundation (rem

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@leonardoalt

Leo Alt

2 years

story of all of us

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@leonardoalt

Leo Alt

2 years

All good bro no overflows

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@leonardoalt

Leo Alt

2 years

I wanted to dive into the deepest details of zkRollups, so I'm writing a simple one from scratch and it's been extremely fun! It's quite modular, easy to change, and works end-to-end. I'm not in Denver, but if anyone wants to hack on it I'm happy to help!

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GitHub - leonardoalt/fusion: An experimental progressive and fast zkRollup written in Rust, focused...

An experimental progressive and fast zkRollup written in Rust, focused on performance, modularity, and applying cutting-edge Verifiable Computation proof systems. - leonardoalt/fusion

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@leonardoalt

Leo Alt

1 year

we did it!!

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@leonardoalt

Leo Alt

1 year

wait, why don't we just compile LLVM to EVM????

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@leonardoalt

Leo Alt

3 months

Here's a deep dive into our EthBerlin4 project R55: Have fun u nerds

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This post explains how R55 works and our process for building the PoC in under 40h.

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@leonardoalt

Leo Alt

4 years

The SMTChecker's CHC engine can now synthesize external unknown code as part of a counterexample! Available in @solidity_lang upcoming 0.8.1

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Automated Synthesis of External Unknown Functions

The SMTChecker, a formal verification module built-in the Solidity compiler, received a lot of improvements in 2020. Many improvements are related to Solidity’s language features, such as structs,...

fv.ethereum.org

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@leonardoalt

Leo Alt

2 years

kyc is the biggest scam in our industry

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@leonardoalt

Leo Alt

3 years

Most important conclusion of the @solidity_lang developer survey 2021: as usual, Vim > Emacs

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@leonardoalt

Leo Alt

2 years

why are Airbnb's interns testing in prod with my account go away

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@leonardoalt

Leo Alt

1 year

new low level EVM language just dropped?

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GitHub - fjl/geas: The Good Ethereum Assembler

The Good Ethereum Assembler. Contribute to fjl/geas development by creating an account on GitHub.

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@leonardoalt

Leo Alt

2 years

if smart contracts were never written we maybe wouldn't have hacks

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@leonardoalt

Leo Alt

2 years

After only using dapptools/foundry for a long time and now dealing with JS tests for a few days, it blew my mind that people are still writing JS tests, it's so so bad.

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@leonardoalt

Leo Alt

2 years

A short answer from the perspective of @solidity_lang , smart contract devs, and users: 1/5 Massive gas savings via RJUMP, RJUMPI, RJUMPV. This benefits every user of every contract written in every language.

@abcoathup

abcoathup.eth 🐡 🛡️🦇🔊

2 years

@TimBeiko @protolambda @N_EDITS I am still hoping someone from team EOF can explain the benefits to Solidity and the app layer of EOF.

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@leonardoalt

Leo Alt

1 year

1/3 A big joint effort will soon enable us to verify Nova proofs on Ethereum. @huitseeker @han__0110 and I have been working on halo2curves and adapting Nova to use the BN/Grumpkin cycle. @jbaylina @eduadiez @roger_taule are also close on the Circom verifier. Relevant links \/

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@leonardoalt

Leo Alt

3 years

Wanted to try out Foundry and recent @solidity_lang , wrote a symbolic execution engine with a Difference Logic solver as a little hackathon this weekend. Still kinda surprised it actually works. Code could use memory vectors tho

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GitHub - leonardoalt/dl_symb_exec_sol: Symbolic execution engine written in Solidity, based on...

Symbolic execution engine written in Solidity, based on Difference Logic. - leonardoalt/dl_symb_exec_sol

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@leonardoalt

Leo Alt

3 months

Really happy that we managed to pull off what at first felt like a crazy ambitious technical project for a hackathon. Big thanks to my teammates @lcvella , Rodrigo, Moritz and ofc @ETHBerlin !! Running on no sleep so a write-up will come later this week

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GitHub - leonardoalt/r55

Contribute to leonardoalt/r55 development by creating an account on GitHub.

@ETHBerlin

ETHBerlin04

3 months

Our final track award is for Infrastructure. The winner is R55, a huge congrats to the team. And a big shoutout to the runners up are Anti-Correlation & Voto⚡️

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@leonardoalt

Leo Alt

2 years

Foundry + Solidity tip: if `via_ir = true` is taking too long to compile, you can specify which optimizers should run. The example below is less optimized but compiles faster, kinda like a `--debug` option `optimizerSteps = 'dhfoDgvulfnTUtnIf'`

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@leonardoalt

Leo Alt

2 years

Hacking with @_hrkrshnn on the train to @EFDevconnect , writing a new optimization step for @solidity_lang . Maybe fewer `unchecked` blocks will be needed soon 👀

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@leonardoalt

Leo Alt

2 years

The way @3blue1brown connects math to stories, mystery, and the feeling of "I gotta know why and how!!" is the absolute explanation why schools fail so badly at teaching math and science. Same goes for coding.

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@leonardoalt

Leo Alt

1 year

A month of slow typing for me

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@leonardoalt

Leo Alt

2 years

The *actual* first zkevm is from 2021, written in @zokratesproject 👀

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GitHub - leonardoalt/tinyzkevm

Contribute to leonardoalt/tinyzkevm development by creating an account on GitHub.

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@leonardoalt

Leo Alt

2 years

"what the fuck is this shit" wow what a nice and respectful way of publicly asking fellow devs for information the entitlement is baffling

@norswap

Happy Norswap 🤠🏴‍☠️✨

2 years

The solidity compiler changes the deployed bytecode depending on whitespace in the source code. What the fuck is this shit?

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@leonardoalt

Leo Alt

7 months

except wave is money

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@solidity_lang

Solidity

7 months

Solidity v0.8.24 is out! 🎉 The latest version of the compiler brings readiness for "Cancun" network upgrade, including support for transient storage (EIP-1153), shard blob transactions (EIP-4844), & more. ✍️Blog: 💾GitHub:

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@leonardoalt

Leo Alt

3 years

Something today reminded me of this. Use Rust to advertise all the good stuff, but... (includes non-Eth L1 chains)

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@leonardoalt

Leo Alt

1 year

PUSH0 PARTY EF BERLIN OFFICE TONIGHT LET'S GO

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@leonardoalt

Leo Alt

2 years

self review best review

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@leonardoalt

Leo Alt

2 years

approaching the end of the Solidity dev survey

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@leonardoalt

Leo Alt

2 years

Absolute chad work by Kamil, @matheuspit77 and @iskdrews at @ETHBerlin , writing a basic LSP for Yul in under 20h while learning Rust.

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GitHub - cameel/yul-lsp: Language server for the Yul language

Language server for the Yul language. Contribute to cameel/yul-lsp development by creating an account on GitHub.

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@leonardoalt

Leo Alt

2 years

@transmissions11 @z0age Why can't y'all be normal teenagers and just take drugs for that extra excitement

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@leonardoalt

Leo Alt

1 year

pip is so cursed how is any of this allowed

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@leonardoalt

Leo Alt

3 months

why are we using centralized L2s

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@leonardoalt

Leo Alt

1 year

Reviewing Polygon zkEVM was quite challenging, interesting and fun. I mainly analyzed the PIL State Machines which define specialized behavior via low-level constraints. We're doing a @SpearbitDAO workshop about that tomorrow, the recording will be uploaded after!

@0xPolygonFdn

Polygon Foundation

1 year

Every component of Polygon zkEVM (including the prover) has been audited—and those audit reports are available on GitHub. How else could you DYOR? Read the findings from @spearbitDAO ’s security audit 👇🏽

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@leonardoalt

Leo Alt

2 years

Who remembers this @solidity_lang milestone

@jzlegion

jz

4 years

Is the code from @ArianaGrande 's 34+35 music video Soldity? It has msg.sender, selfdestruct, and I'm pretty sure "greeter is mortal"is from the Solidity tutorial.

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@leonardoalt

Leo Alt

2 years

Foundry

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@leonardoalt

Leo Alt

3 years

Honest question: why doesn't @solidity_lang get many contributions from other people/teams? Folks not interested in compiler work? Is it generally considered scary? Too much work to get started? A lot more could get done by nerdsniping some of you

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@leonardoalt

Leo Alt

1 year

touching grass & tarmac

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@leonardoalt

Leo Alt

3 years

@Mudit__Gupta had to

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@leonardoalt

Leo Alt

1 year

wait, why don't we just compile LLVM to EVM????

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@leonardoalt

Leo Alt

2 years

Listening to ACD is quite sad these days. A bunch of for-profit companies trying to manipulate Ethereum to do what's gonna bring them even more money, regardless if a feature is ready.

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@leonardoalt

Leo Alt

2 years

merging a PR that's almost 2 years old

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@leonardoalt

Leo Alt

3 years

Have you ever had a proof

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@leonardoalt

Leo Alt

3 years

Now @ethchris debunking the fake news from some experts that @solidity_lang 's optimizer has "too many bugs" and therefore should not be used. Wat?

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@leonardoalt

Leo Alt

2 years

@dystopiabreaker lmao really can't make this stuff up sigh

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@leonardoalt

Leo Alt

3 years

I finally updated with a few links/projects. New additions below:

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GitHub - leonardoalt/ethereum_formal_verification_overview: Overview of the formal verification...

Overview of the formal verification projects in the Ethereum ecosystem. - leonardoalt/ethereum_formal_verification_overview

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@leonardoalt

Leo Alt

2 years

yall should use @vyperlang and @huff_language more often

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@leonardoalt

Leo Alt

7 months

Signal and Matrix: keep shipping "Crypto" community: "we rely on Discord and Telegram" 🤡🤡

@signalapp

Signal

7 months

Introducing usernames and phone number privacy on Signal! We’re making it possible for people to connect with each other without having to share phone numbers. Now launching to beta users, available for everyone soon.

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@leonardoalt

Leo Alt

1 year

hear me out: x86 precompile at address 0x86

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@leonardoalt

Leo Alt

10 months

and this, Ethereum folk, is why the EVM to this day sucks and will likely never improve. Conservatives think progress is "bs" and should not happen

@dankrad

Dankrad Feist

11 months

@Tudmotu @gballet @shemnon If you mean faster iteration on the EVM on mainnet, that is bs and should actually not happen. If you mean on rollups, then they can already do this NOW and don't need mainnet to implement any specific EOF veesion.

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@leonardoalt

Leo Alt

5 months

I'm going to implement Brainfuck VMs in all possible ways using powdr. Here's the first one written directly in powdr-asm. Turned out quite nice actually, though it's fully untested - feel free to break it

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GitHub - leonardoalt/powdr-brainfuck: ZK proofs for Brainfuck execution using powdr

ZK proofs for Brainfuck execution using powdr. Contribute to leonardoalt/powdr-brainfuck development by creating an account on GitHub.

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@leonardoalt

Leo Alt

1 year

In Montenegro/Zuzalu tomorrow for the ZK week, reach out if you wanna chat about Powdr, Fusion, FV, Solidity or other cool stuff! I'll give a talk about Powdr on Friday and probably hack on Nova too at the hackathon

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GitHub - powdr-labs/powdr: A modular stack for zkVMs, with a focus on productivity, security and...

A modular stack for zkVMs, with a focus on productivity, security and performance. - powdr-labs/powdr

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@leonardoalt

Leo Alt

8 months

big goal for 2024 is to go to max 3 conferences, only 1 outside of Europe. Thinking @ETHBerlin , ZKSummit, @EFDevcon

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@leonardoalt

Leo Alt

2 years

This is fake news. First of all, this is not planned *at all*, it's just an exploration of what *could be*, please watch the talk. Second, this slide actually shows current Fe lmao

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@leonardoalt

Leo Alt

5 years

Solidity's SMTChecker now supports multi-transaction checks and unbounded loops!

SMTChecker toward completeness

The SMTChecker current model checking engine is safe but not complete. This means that assertions and other verification targets reported…

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@leonardoalt

Leo Alt

9 months

south americans in europe winter be like

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@leonardoalt

Leo Alt

2 years

last 10h of @paradigm_ctf I NEED to solve JIT and my teammates are playing 0xMonaco u happy @transmissions11

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@leonardoalt

Leo Alt

2 years

Another perk of being at the office is getting to type on my beast. Immediate increase of productivity + feels good

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@leonardoalt

Leo Alt

11 months

what happened to having more Solidity compilers? I'm this close to writing one in Prolog

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@leonardoalt

Leo Alt

6 years

Solidity has a built-in formal verification module, the SMTChecker. I talked about it at #Devcon4 and you can read about it here:

Formal Verification in Solidity

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@leonardoalt

Leo Alt

6 years

I'm compiling an updated list of Ethereum formal verification projects: Let me know if I missed something or got anything wrong!

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GitHub - leonardoalt/ethereum_formal_verification_overview: Overview of the formal verification...

Overview of the formal verification projects in the Ethereum ecosystem. - leonardoalt/ethereum_formal_verification_overview

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@leonardoalt

Leo Alt

1 year

solidity dev survey absolutely wild this year

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@leonardoalt

Leo Alt

2 years

Btw I didn't even have to think about crazy tricks to get it this short. Wrote a simple Yul code, compiled, and ran the GASOL super optimizer after

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GitHub - costa-group/gasol-optimizer

Contribute to costa-group/gasol-optimizer development by creating an account on GitHub.

@leonardoalt

Leo Alt

2 years

@the_ethernaut @721Orbit 3d353d5b81818202116012576001016003565b60019003803d5260203df3 assumes calldata input is uint256, computes floor(sqrt(x)), 30 bytes, wastes loads of gas

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@leonardoalt

Leo Alt

2 years

some alpha going on in calls 👀

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@leonardoalt

Leo Alt

3 years

Potentially organizing a Formal Verification Hangout day at @EFDevconnect , no talks just chill technical discussions and sharing, who's down? @MartinLundfall @rikardhjort @joranhonig @Montyly @GNSPS @vwuestholz @SagivMooly (sorry couldn't tag all, no offence)

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@leonardoalt

Leo Alt

1 year

lmao who else would write this block of code

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@curta_ctf

Curta

1 year

🚨 Puzzle 17 NOW LIVE 🚨 By @_hrkrshnn , cofounder at @SpearbitDAO 📌

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@leonardoalt

Leo Alt

1 year

. @zokratesproject just shipped a banger release with Nova support! At the same time as a bunch of people are hacking crazy stuff on Nova during Zuzalu's ZK Week & ZK hackathon Nova the future?

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@leonardoalt

Leo Alt

3 years

Following my talk at "Formal Verification in the Ethereum Ecosystem", organized by @rv_inc , here's a sort of transcript of the @solidity_lang 's SMTChecker + @dapptools demo (that actually worked live)

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SMTChecker, Remix & Dapptools

The SMTChecker is a formal verification module inside the Solidity compiler. Historically it has been complicated to run the SMTChecker on your own contracts, since you had to compile the compiler...

fv.ethereum.org

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@leonardoalt

Leo Alt

1 year

push0

@solidity_lang

Solidity

1 year

We just released Solidity 0.8.20! 🚀 This latest version includes a range of improvements in the via-IR pipeline and improves the list of events exposed in the contract ABI, and, most importantly, support for Shanghai! 📖: 💾:

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@leonardoalt

Leo Alt

1 year

We had a name for VM built-in functions, they were called opcodes. We should be getting rid of hacky precompiles and not adding more.

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@leonardoalt

Leo Alt

2 years

If there's a new recovered UST is it gonna be called RUST?

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@leonardoalt

Leo Alt

2 months

should I write a VM and call it AltVM

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@leonardoalt

Leo Alt

5 months

Greece is just amazing, will definitely visit Athens again. Also ZK Summit was great! Now back to building.

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@leonardoalt

Leo Alt

2 years

that's a weird distribution

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@leonardoalt

Leo Alt

1 year

bright_century_ahead_doomer_fusion_meme.png

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@leonardoalt

Leo Alt

2 months

Looks like we might lose EOF, again. L1 just isn't interested in future-proofing its VM. If any L2 wants to add RISCV smart contracts to their stack, I'm happy to help advise the effort. We've already built a working prototype via revm, interoperable with EVM contracts!

@leonardoalt

Leo Alt

3 months

Here's a deep dive into our EthBerlin4 project R55: Have fun u nerds

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@leonardoalt

Leo Alt

2 years

What a sick space they got us for the FV hangout!

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Leo Alt

1 year

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@leonardoalt

Leo Alt

2 years

Long flight entertainment is quite entertaining

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@leonardoalt

Leo Alt

2 years

but at the same time

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@leonardoalt

Leo Alt

2 years

Latest addition to the Ethereum FV list, by @TannrAllard and @Kurt_M_Barry \/ Now you have the whole weekend to learn some FM/FV

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GitHub - WilfredTA/formal-methods-curriculum: Formal methods training program with an emphasis on...

Formal methods training program with an emphasis on software in the blockchain & decentralized financed (DeFi) industry - WilfredTA/formal-methods-curriculum

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@leonardoalt

Leo Alt

8 months

touching sand (& tarmac)

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@leonardoalt

Leo Alt

1 year

do people actually not use vim?

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@leonardoalt

Leo Alt

2 years

did anyone say Yul -> PLONK compilation?

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@leonardoalt

Leo Alt

4 years

Upcoming in @solidity_lang 's SMTChecker: multi-transaction counterexamples including reentrant calls!

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@leonardoalt

Leo Alt

2 years

Who's down for Yul Summit in Canada?

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@leonardoalt

Leo Alt

2 years

Got back to the office and found these two new acquisitions. Which one first

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@leonardoalt

Leo Alt

1 year

I'll be sending this (and more) to my team on repeat until I get reviews

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@leonardoalt

Leo Alt

2 years

why is it so complicated to concat two [u8; 32] into a [u8; 64] in Rust in a type safe way? All solutions I see go through Vec and try_into unwrap, ugly af pls help

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@leonardoalt

Leo Alt

1 year

Excited for this one, hope you nerds don't break it too quickly

@curta_ctf

Curta

1 year

Puzzle 11 ⛳️ This Wednesday, May 24th at 10AM ET By @leonardoalt , formal verification lead @ethereum and @solidity_lang contributor

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Leo Alt

1 year

For the @solidity_lang nerds: have you ever used anonymous events? cc @sina_mahmoodi

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@leonardoalt

Leo Alt

2 years

Sitting at a cafe by the beach, listening to the new @meshuggah album, coding Ethereum stuff. Funny that the album is called "Immutable", just like smart contracts should be.

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@leonardoalt

Leo Alt

1 year

Symbolic execution still works tho 😬

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@0xkarmacoma

karma

1 year

As promised, here's the write-up: Thanks @walden_yan for the cool challenge! You were right about it being not SMT-friendly, I killed halmos after 15h of CPU time 🫠

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