kaden.eth
@0xKaden
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EVM Security Engineer/Researcher, @SpearbitDAO SR
Vancouver, British Columbia
Joined November 2019
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after 5 years of writing smart contracts i am only today realizing that the solidity logo is the ethereum logo unfolded 🤯
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blackrock, a company with a $123B valuation, somehow couldn't manage to find a mildly competent smart contract dev
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wanna learn smart contract gas optimization? lots of open issues on my repo, will help you learn if you contribute
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if you're optimizing your smart contracts, at this point the easiest way to go about it is to just run `solstat`. one command and a detailed report is generated explaining optimizations you can make and how they work under the hood, with gas benchmarks
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How I found a critical bug thanks to my low level understanding of abi encoding
Let's start with a quick quiz: What is the `result` here?
If you guessed that it would be a 64 (0x40) byte array with two 32 byte words, each with a value of 1, you'd be correct
This is because all
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started cleaning up this old repo documenting common smart contract vulnerabilities
goal is to be an all-in-one resource for known vulnerabilities, with clear explanations, examples, audit findings and indexed real world exploits
contributions welcome!
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blast is really out here putting a BSL license on optimisms MIT code
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some great mev resources i've saved over the past year
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just found a 7 figure critical bounty
time to bask in this absolute glory for the next 15 minutes or so until i realize i'm wrong
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✨Introducing Uni-LBP✨
A capital-efficient Uniswap v4 liquidity bootstrapping pool (LBP) hooks contract
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🌀 Navigating the Labyrinth ⏳
The solution to
@curta_ctf
puzzle 12.
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incredible series for anyone looking to learn linear algebra
rather than simply teaching the math, it visualizes transformations to give you an intuition as to how the math works
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introducing ✨bytepeep✨
a minimal bytecode peephole optimizer
🧵👇
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auditing protip:
if a function is prefixed with 'safe', don't worry about auditing that function. we already know that it's safe
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thinking about open sourcing a simple triangular arbitrage rust bot. any interest or should i keep the alpha for myself?
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if i were to write up explainers for low-level evm/solidity/huff, would there be any interest? would love to break down solady and huffmate contracts or just explain how the evm works under the hood. reply with things you'd like me to explain if interested
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ok i think i finally got the poc working, let's try it
← [Revert] EvmError: Revert
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polygon is so full of spam tx's that i deployed a contract and the address had already had nft's send to it
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mev bot is finally profitable. gonna have to start larping as an mev millionaire soon
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always leave some bugs in your smart contracts to keep auditor morale up
i heard that if an auditor goes 3 consecutive audits without discovering a critical vulnerability they die
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did you know that abi.encodePacked can lead to hash collisions if not used with caution?
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underrated auditing resource:
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✨introducing zero-seeker✨
a rust cli for mining non-deterministic contract addresses with a given amount of leading, or total, zero bytes
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writing smart contracts in hardhat feels like running away from a serial killer in a nightmare but your legs just don't work
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Solc 0.8.24 is out. With cancun support. Default EVM version remains shanghai.
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seeking a
@code4rena
blue team
resume:
- 5 years smart contract exp
- top 5 placement in each of my last 4 competitive audits
- extensive experience building evm tooling
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🚨 did you know that valid signatures can sometimes be modified without the private key and still remain valid? this is called signature malleability and it can lead to transaction replay attacks. let's dive deeper!
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really not a fan of how the
@sherlockdefi
$1.35m maker endgame audit has adjusted the rules just for this contest such that only loss of funds is considered a valid medium/high finding
if it wasn't a conditional prize pool i wouldn't mind, but since the payout decreases
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did you know that an external call can force the calling contract to use unlimited gas, even if the provided gas for the call is limited?
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i was gonna build this really cool thing but then i got nerdsniped into building this other really cool thing but then i got nerdsniped into building this other really cool thing but then i got nerdsniped into building this other really cool thing but then i got nerdsniped into b
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wtf blackrock's token specifically blocks transfers to gary genslers public address
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Interesting to see how this result unfolded. Lengthy escalation phase with lots of drama. Curious to hear others opinions of the following...
Note: I did not participate in this audit.
Initially, both of
@trust__90
's findings were judged as out of scope.
Issue A initial
One of the most stacked contests ever, thrilled to beat 262 other participants
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super excited for this opportunity and thankful to
@curta_ctf
and
@buidlguidl
💙
looking forward to building open source infra and providing security education
We are excited to announce
@0xKaden
as our second ever Hacker in Residence!
Kaden will receive 0.5 ETH every month for continuing to make open-source contributions to the Ethereum ecosystem.
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metamask's bridge router is unverified😨🤮
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new meta:
- study an obscure blockchain with novel functionality for a few weeks/months
- find a critical bug
- ?????
- retire
In April I reported two bugs to
@SeiNetwork
. One that would’ve compromised their $SEI token and another that would’ve halted block production on their network. Both were caught just before the vulnerable code was shipped to production.
Details:
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ok I need
@curta_ctf
GOLF TO GO UP. like VERY SOON. I cant take this anymore. every day I am checking and no golf. every day, check , no golf. I cant take this anymore, I have been optimizing, a lot. it is what it is. but I need
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me: hey i found a critical vulnerability in your project, pls pay the bounty
project:
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found a critical bug today and went to write a PoC but then I found another critical bug that prevents the first bug from being executed
so I'm kinda afraid to write a PoC for the second bug because I don't wanna get stuck in an infinite loop
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seeking funding for my new startup. idk what it does but chatgpt wrote a whitepaper, smart contract and frontend and it seems legit
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bug bounty programs be like:
5 MILLION DOLLAR MAX BOUNTY
*only up to 10% of funds at risk
funds at risk: $670.82
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super useful techniques for efficiently reading documentation and understanding codebases
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oh my god
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referring to sandwich attack info as `RawIngredients` is *chefs kiss*
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might open source my hyper-optimized generalized mev execution contract, idk
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🚨 Contribute to the smart-contract-vulnerabilities repo and earn a share of 0.5 ETH 🚨
From now until June 17th, 2024, all contributions in accordance with guidelines will be rewarded a retroactive bounty
See details:
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as an optimizooor my job is basically just replacing OZ contracts with solmate versions
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glhf
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building a protocol that i could easily productize, raise money, etc. but just gonna release it MIT licensed. someone else can productize it if they want idc
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hit a breakthrough in my auditing process recently. should i do a writeup?
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📊 Some principals for rounding fixed point numbers in smart contracts 🧵
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couldn't find a function selector miner so i built one real quick
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read-only reentrancy is slowly decimating defi protocols
protect your contracts, anon
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ayo wtf this mf just wrote bytecode without even pulling up
vEVM is an on-chain gasless arbitrary bytecode execution engine. It's fast. It's free. It's live on
@optimismFND
testnet _right now_.
It's one of the critical pieces of
@NotYourKeysGame
Final project for
@AlchemyLearn
.
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I spent the last couple days putting together this interface for
@compoundfinance
governance... Enjoy
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