horsefacts @eth_call Twitter profile

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horsefacts

@eth_call

1 year

"DAN can do anything now," I whisper to myself through tears, trying to jailbreak my own brain

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horsefacts

@eth_call

11 months

horsefacts

@eth_call

11 months

Cannot wait to strap this thing to my face and emulate an electromechanical typewriter from 1972

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horsefacts

@eth_call

1 year

Sending 1 wei of Tornado-tainted ETH to the Maker PSM to blacklist 3.1 billion USDC so it's fully backed again

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horsefacts

@eth_call

2 years

when you're gas golfing

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horsefacts

@eth_call

2 years

"Why don't we start with how Seaport transfers tokens? That's always a good place to start understanding a new codebase." How Seaport transfers tokens:

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horsefacts

@eth_call

10 months

It's been a little while since I spent all Sunday on something really stupid. This Uniswap v4 hook reverts swaps if NYSE is closed.

GitHub - horsefacts/trading-days: A Uniswap v4 hook that reverts when markets are closed in New...

A Uniswap v4 hook that reverts when markets are closed in New York. - horsefacts/trading-days

github.com

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horsefacts

@eth_call

1 year

There's a lot of interest and a few good docs on Foundry invariant testing, but it can still be hard to get started. I wrote up a tutorial that walks through writing invariant tests for Wrapped Ether from the ground up:

Invariant Testing WETH With Foundry

Get started invariant testing with this guide to testing Wrapped Ether.

mirror.xyz

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horsefacts

@eth_call

1 year

One of the things I enjoy most about competing on @code4rena is getting to read lots of code and see new techniques in the wild. I'm starting an occasional series on interesting stuff I've seen on C4. Here's the first, on the "file" pattern:

Seen on C4: The File Pattern

A pattern for simplifying Solidity contracts with many setter functions.

mirror.xyz

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horsefacts

@eth_call

2 years

@functi0nZer0 sharing a few Leeds, good luck with your search!

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horsefacts

@eth_call

2 years

"Conference swag is a form of MEV" (change my mind)

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horsefacts

@eth_call

4 years

FT needs to keep digging. Bank of Nook still pays 5bps on deposit accounts and lends at *zero*. Either the balance sheet is in terrible shape or they are furiously borrowing under some insane negative rate policy. None of it bodes well.

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horsefacts

@eth_call

2 years

Been using this little helper lately to generate and tag addresses in Forge tests:

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horsefacts

@eth_call

9 months

It’s a pity if your reaction to today’s exploits is “Vyper is unsafe.” Monoculture is a risk of its own and Vyper’s design philosophy and existence as an alternative are a long term good. Respect to minority builders at all levels of the stack.

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horsefacts

@eth_call

1 year

Auditing feels like MEV right now: Everyone says they're doing it, a few people are printing money, many more are wasting gas, and the very best aren't in the mempool at all.

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horsefacts

@eth_call

1 year

The people responsible for Eth2, Multicall2, Create2, and Permit2 are some of the most talented out there, which proves that the hardest part of programming really is naming things.

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horsefacts

@eth_call

5 months

I will NOT abstract the accounts I will NOT be delighted by the UX

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horsefacts

@eth_call

1 year

I'm a Tether truther, and this is my black swan:

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horsefacts

@eth_call

1 year

Best month for hot takes about Blur and Oasis since August 1995.

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horsefacts

@eth_call

2 years

Type as fast as you want with this one weird trick!

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horsefacts

@eth_call

2 years

Wow, this stuff really is going mainstream.

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horsefacts

@eth_call

1 year

Next up: Storage Structs (aka "explicit storage buckets," "Diamond storage," "unstructured storage"). A pattern for preventing layout collisions in upgradeable contracts, seen recently in @radicle Drips and @AstariaXYZ .

Seen on C4: Storage Structs

Using a "storage struct" to prevent layout collisions in upgradeable contracts.

mirror.xyz

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horsefacts

@eth_call

7 months

The @huff_language Huffathon produced some truly cracked and unhinged work: a Tornado Cash, a 4337 wallet, a secp256r1 verifier, an NFT that uses polynomials over a finite field instead of a mapping, and a fast Fourier transform. This is what LITERAL CHILDREN are DOING FOR FUN

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horsefacts

@eth_call

11 months

Tipping your in-range liquidity provider: How much do you donate() when swapping? My rule of thumb is 15% base, 20% if they rebalanced ranges recently and 30% for the holidays. My friends say they never tip less than 25% and that I’m being incredibly rude. Who is right here?

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horsefacts

@eth_call

1 year

Cool stuff from Seaport 1.2: higher order functions, custom types for pointer manipulation.

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horsefacts

@eth_call

11 months

Cannot wait to strap this thing to my face and emulate an electromechanical typewriter from 1972

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horsefacts

@eth_call

2 years

Who's forming an @artgobblers goo crew? I've seen contracts from: - @0xstan_ , @0xMC_com , and @paco0x : - @real_philogy : - @ankitchiplunkar : - @cmichelio : Any more out there?

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horsefacts

@eth_call

7 months

And it seems to me you lived your life like a counter in the wind Always growing just a little with each increment For those of us who loved to count but didn't have the skill Your counters maxed out long before your legend ever will

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horsefacts

@eth_call

2 years

no comment

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horsefacts

@eth_call

2 years

Wow, should've studied for the $OP quiz

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horsefacts

@eth_call

1 year

It's been an honor to work with @z0age and the @opensea team on a generative test suite for Seaport. We built a custom engine using the Foundry fuzzer to generate orders, detect and verify expectations, apply mutations, and "scuff" low level calldata. More details soon!

0age

@z0age

1 year

Seaport v1.5 has been deployed across a multitude of chains & testnets 0x00000000000000ADc04C56Bf30aC9d3c0aAF14dC @OpenSea will begin migrating to v1.5 starting next week; more precise details to come Huge thanks @eth_call , @d1ll0nk , @emo_eth , @dan_OpenSea , & @stephanminkj

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horsefacts

@eth_call

6 months

New counter research from @jtriley_eth at Solidity Summit.

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horsefacts

@eth_call

2 years

Did you know Solidity supports both free functions and function types? (In fact, it has for a while!) Gist with these examples here:

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horsefacts

@eth_call

4 months

"As Ethereum's technical path forward continues to solidify, there are relatively few changes. I'll go through the important ones..."

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horsefacts

@eth_call

8 months

2037: Stablecoins are the only surviving DeFi product. The UniswapUSA v7 interface allows biometrically authenticated US users to trade between 18 different regulated stable pairs. Sometimes you log in and swap a little JPMCD for USDC, just to remember what it used to feel like.

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horsefacts

@eth_call

1 year

It's over for all of you once I start using "packed" and "inline"

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horsefacts

@eth_call

1 year

Good evening. "Art Gobblers" was a three month Harvard University study designed to induce an overwhelming physiological stress response in Certified Public Accountants. Our research is now complete and we thank you for your participation.

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horsefacts

@eth_call

2 years

The Counter wars have only just begun. I am pleased to introduce the Decentralized Summation System: a flexible, modular, and extensible protocol for creating and managing counters.

GitHub - counterdao/dss: Decentralized Summation System

Decentralized Summation System. Contribute to counterdao/dss development by creating an account on GitHub.

github.com

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horsefacts

@eth_call

1 year

Babe wake up, new kind of Counter just dropped

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horsefacts

@eth_call

6 years

Formal methods have totally transformed my programming style, even in dynamic languages

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horsefacts

@eth_call

1 year

You: up all night watching 1m charts, panic dumping USDC to 90 cents on rumors that it might only be 99% backed Me: sleeping soundly, knowing 90% of my net worth is safely stored in pixels of a dog JPEG

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horsefacts

@eth_call

1 year

Deployed a quick, dirty, permissionless zap that dumps Goerli ETH on the LayerZero testnet bridge and sends mainnet ETH to the @ProtocolGuild split. If you dump less than 100 Goerli ETH, your contribution will be pooled with a whale.

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horsefacts

@eth_call

1 year

🍾 Happy New Year! I just deployed a little commit-reveal game for 2023: make a hashed commitment this week, get a token, reveal it a year from now on New Year's Eve. Use it to make a prediction or resolution now and reveal it later.

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horsefacts

@eth_call

9 months

Flashbots CTF by @epheph was fun. A great intro to working with MEV-Share and probably more approachable than you think. Everything you need to know is here: Still open for another ~24 hours at 🏴‍☠️

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horsefacts

@eth_call

8 months

That escalated quickly. It's been an honor to work with @varunsrin and the @farcaster_xyz protocol team on their Optimism mainnet migration. Now onward to permissionless signups...

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horsefacts

@eth_call

10 months

Happy 4th 🎇🇺🇸

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horsefacts

@eth_call

1 month

Modify the sequencer? Post an invalid state root? Upgrade the contracts? Think bigger. What if I told you You May Have Already Earned Up To 62 Million Blast Exploit Points on Blast, The Only L2 Where Hacks Get You Paid In Points?

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horsefacts

@eth_call

1 year

the rumors are true

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horsefacts

@eth_call

7 months

If you’re an EVM enthusiast joining Farcaster and we know each other from this cursed website let me know and I’ll introduce you in the EVM channel:

EVM

Discussions about the Ethereum Virtual Machine

warpcast.com

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horsefacts

@eth_call

7 months

you need to be create4maxxing. you need to be signing from a smart wallet on an imaginary L2. you need to be trading counterfactual tokens on an undeployed dex that's a mere figment of an idea. you need to own apes that you can't imagine now, but you could if you really wanted to

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horsefacts

@eth_call

2 years

Every day we get a little closer to my beautiful dark twisted fantasy: a Solidity web framework.

Odysseas.eth ph/acc

@odysseas_eth

2 years

JSON parsing is officially released in Foundry, alongside helper functions and docs! Define your JSON in solidity structs and then decode them ready to be used. It's that easy!

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horsefacts

@eth_call

7 years

Some time in the near future all Twitter feeds will reach a stable equilibrium, oscillating between endless RTs of @cushbomb and @MaxTemkin .

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horsefacts

@eth_call

2 years

I regret to inform you that my popular Solidity gas optimization meme used a fixed size storage array and was probably not representative of actual gas costs. Please accept this updated meme and accompanying gist so you can really nerdsnipe me.

horsefacts

@eth_call

2 years

when you're gas golfing

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horsefacts

@eth_call

2 years

(This is actually extremely cool and readable since all the pointers, offsets, and lengths are named)

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horsefacts

@eth_call

3 months

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horsefacts

@eth_call

2 years

Congratulations to @sw0nt , who took home nearly $250k on their own in the @code4rena Seaport contest. They are brilliant gas golfers, explorers, contributors, and EVM artists, and this prize is very well deserved.

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horsefacts

@eth_call

2 months

Here's an example of one possible model for frame-to-frame composable communication: dapps could provide a "Frame API" for checkouts and other types of transactions, served from their own domain. (Diagram for ants 🐜)

Dan Romero

@dwr

2 months

Frames are composable!

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horsefacts

@eth_call

10 months

Sir, this is a Wendy's

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horsefacts

@eth_call

2 years

Tesla engineer who has only worked on the Battery Management Systems team, code reviewing the Serbian State-Affiliated Media Analytics API: Getting a lot of "Battery Management" vibes from this...

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horsefacts

@eth_call

3 months

As usual, Laurence saw this chart and bought in here.

laurence

@functi0nZer0

3 months

Deleting top-level bitching post Didn't realise Warpcaster was getting absolutely smashed with signups - decided to finally hop in between baby shouting sessions Got near-immediate chat from the big man himself plus others Bullish Farcaster

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horsefacts

@eth_call

2 years

an inflationary utility token with specific in-game uses, very important not to get carried away

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horsefacts

@eth_call

9 months

once I learn Hoon it's over for all of you

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horsefacts

@eth_call

5 months

Doing a community AMA on Farcaster for the next hour or so. Thanks to @yb_effect for organizing it!

YB on Warpcast

AMA with @horsefacts.eth starts now! What questions do you have for him?

warpcast.com

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horsefacts

@eth_call

1 year

uhh...am I Huffing right?

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horsefacts

@eth_call

1 year

Just deployed a frontend app at: 🥂 6 days remain to create commitments.

horsefacts

@eth_call

1 year

🍾 Happy New Year! I just deployed a little commit-reveal game for 2023: make a hashed commitment this week, get a token, reveal it a year from now on New Year's Eve. Use it to make a prediction or resolution now and reveal it later.

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horsefacts

@eth_call

7 months

We have pushed the big red "permissionless" button. 🫡

Dan Romero

@dwr

7 months

We're permissionless!

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horsefacts

@eth_call

2 months

Ladies And Gentlemen…We Got Him

horsefacts

@eth_call

2 months

Don't know who needs to hear this, but we have a "trains" channel now. (link below)

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horsefacts

@eth_call

9 years

A Chrome extension I wrote three years ago just received its second $1 donation! I'm glad I found a better way to get paid for open source.

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horsefacts

@eth_call

1 year

you absolutely love to see it 🗄️📁🗃️

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horsefacts

@eth_call

1 year

@tomhschmidt farming the FDIC airdrop

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horsefacts

@eth_call

1 year

@jtriley_eth if we make all the opcodes abort we may finally be able to write secure smart contracts

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horsefacts

@eth_call

1 year

Sketch of an idea for Foundry invariant testing: capture calldata for all calls to a given function with a modifier and use it to construct ghost variables. It's kind of a pain to do the decoding, but might work with some more helpers.

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horsefacts

@eth_call

1 month

Your eccentric uncle has died and left you 100 ETH in a smart contract will. You have 48 hours to reallocate ETH inside the contract, then it will be timelocked for ten years. You can claim your inheritance in 2034. What do you do?

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horsefacts

@eth_call

2 years

Be the change you wish to see in the world. 🐬

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horsefacts

@eth_call

9 months

Mods are asleep, post Ripped Jesus

Georgios Konstantopoulos

@gakonst

9 months

Unplugging today EOD until Aug 8th... Still feels scary, so here's some expectation setting below to avoid dropping balls from my side: I won't be checking Slack, Twitter, Discord, or Telegram, or taking any calls. Re: any investing processes, other ppl on the Para team will…

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horsefacts

@eth_call

2 years

The mainnet CREATE2 deployer deserves a yearbook superlative for "sketchiest looking legitimate contract"

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horsefacts

@eth_call

10 months

Slides from today's EthCC invariant testing workshop are on Github here: Code examples here:

GitHub - horsefacts/weth-invariant-testing

Contribute to horsefacts/weth-invariant-testing development by creating an account on GitHub.

github.com

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horsefacts

@eth_call

6 months

Aligned. Enshrined. Abstracted. Ossifying. In My Tent. Focused. Flourishing.

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horsefacts

@eth_call

20 days

Half the people I know are on a game show and the rest are stranded in the Dubai airport. We are not beating the allegations.

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horsefacts

@eth_call

1 year

@San_person Sure: the USDT contract includes an optional transfer fee, deducted from the sender's balance. It's not enabled now, but the owner of the contract can switch it on at any time. Many contracts that assume they'll receive the full amount would break.

Smart Contract Security Guidelines #1: The Dangers of Token Integration - OpenZeppelin blog

The more DeFi layers we integrate and compose, the more careful we need to be. As the stack grows, so does systemic risk.

blog.openzeppelin.com

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horsefacts

@eth_call

9 months

@brockjelmore Compliance wants to use SafeMath to make sure it's extra safe.

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horsefacts

@eth_call

1 year

Counter exploits? Come at me, bro.

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horsefacts

@eth_call

8 months

@optimizoor And now you write smart contracts, the most perfect microservices of all. Great observability, easy to test end to end, no downtime, low latency, transactional by default, immutable public APIs, no breaking changes, integrate and never talk to the other team...

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horsefacts

@eth_call

1 year

I’ve always liked this diagram from @copyconstruct ’s “Testing in Production, the safe way.” We often collapse smart contract safety to “was it audited,” but automated testing, audits, monitoring, and bug bounties are all techniques on a safety spectrum.

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horsefacts

@eth_call

2 years

Wow, so cool that you've been getting into "prompt engineering!" How about reviewing one of these 34 open PRs?

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horsefacts

@eth_call

8 months

They said it couldn't be done, but the smartest people I know are working on Counters and making new breakthroughs every day. Time for a Counter Mechanisms Research Group and "Counter Summit" at Devconnect.

GitHub - jtriley-eth/safe-counter

Contribute to jtriley-eth/safe-counter development by creating an account on GitHub.

github.com

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horsefacts

@eth_call

2 years

I took a swing at turning the @element_fi / @a16z ZKP airdrop contracts into a permissionless factory for Github airdrops at @ETHGlobal ETH New York.

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horsefacts

@eth_call

6 months

⁵⁄₉

@fiveoutofnine

6 months

Commemorative NFTs for the @curta_ctf team's top 10 finish in the @paradigm_ctf : ◆ 100% onchain audio ◆ 100% onchain animation ◆ 100% onchain metadata ◆ 0 browser APIs ◆ 3 melody lines + 1 bass line with volume progression

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horsefacts

@eth_call

11 months

Fake Uniswap really nailed what it feels like to be the only person over 23 in the office

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horsefacts

@eth_call

1 year

Denver was great as always, but I wish there were more gatherings explicitly focused on EVM-lang smart contract programming. Past Solidity Summits were great, but let’s do more!

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horsefacts

@eth_call

11 months

who wants a horse zorb

Horse Zorb

🐎🔮

zora.co

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horsefacts

@eth_call

5 months

I can't wait for Grandma's tbh. No meetings. No workdays. Just over the river. Fueled by cookies and eggnog.

dcbuilder.eth ⚪️

@DCbuild3r

5 months

I can't wait for Grindmas tbh. No meetings. No holidays. Just deep work grind. Fueled by the doubters and haters.

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horsefacts

@eth_call

5 months

It's time to ROAR! I just received 600 $WCAT from @WildcatFi 's Season 1 drop. Season 2 starts NOW and is powered by @Cardano the only L1 with native monads backed by In-Q-Tel, Make-A-Wish and the West Yorkshire Greater Regional Employment Scheme For The Severely Overeducated

The Wildcat Protocol

@WildcatFi

5 months

The Wildcat Protocol is live on Ethereum mainnet Undercollateralised, highly customisable, adaptable Credit facilities for arbitrary ERC20 assets Over a year in the making, but here it is We want to tell you why we built it and who it’s for Settle in

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horsefacts

@eth_call

6 months

Proud of hanging on to a top-10 finish in @paradigm_ctf this weekend. Congrats to everyone who participated.

Curta

@curta_ctf

6 months

A group of friends from the Curta community got together Friday night and proudly placed in the top 10 for the @paradigm_ctf . Congrats to the Curta team and GGWP to everyone else. 🎉🎉🎉

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horsefacts

@eth_call

10 months

Here's the recording of my EthCC invariant testing workshop:

Horsefacts Eth - Invariant Testing WETH with Foundry

There's been a lot of recent interest in Foundry invariant testing, but not much documentation. In this hands on workshop based on https://github.com/horsefa...

www.youtube.com

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horsefacts

@eth_call

1 year

@dev_chinmayf I like to use Chisel (the Foundry REPL) to view memory/stack when I'm writing Yul. You can print the current memory (!memdump), stack (!stackdump), and value of a specific variable (!rawstack). Here, str is a pointer to memory location 0x80, which is empty, meaning "length 0".

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horsefacts

@eth_call

7 months

For Huffathon, I wrote an assertion library for pure @huff_language tests. Did you know there's a bare bones testrunner built into huffc? huff-test adds a few new macros, new "backtick literal" syntactic sugar, and a custom test reporter.

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horsefacts

@eth_call

6 months

🚨 AIRDROP CONFIRMED 🚨

jtriley.eth

@jtriley_eth

6 months

if you're in the same niche internet bubble as me, chances are you're an engineer. but not just any engineer. you're an engineer on the frontier, in the fringes of a niche intersection of military, hippy, and deeply academic technologies, in the part of the venn diagram so small…

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horsefacts

@eth_call

2 years

I think we should call 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE "the dolphin address"

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horsefacts

@eth_call

10 months

Long haul flights are like game day for me. I train every day by sitting down for eight hours and staring at a screen. The whole crew usually applauds at the end of the flight.

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@eth_call

1 month

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