@arbitrum Security Council | Senior Security Researcher @Certik | Prev. @immunefi | views are my own

Joined January 2021
day one of giving the fly unlimited white monster and cigs until its neurons are trained to win me bug bounties
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Wintermute lost 20M OP to an address that didn't exist They gave Optimism their ETH Safe address. The guys from OP decided to send the funds to their OP Safe address... > the Safe came from the old factory's createProxy, plain CREATE > CREATE addresses come from deployer + nonce, nothing about the code or the owners > the factory itself was deployed with a pre EIP-155 TX, no chain id, replayable on any chain > attacker replays the factory on Optimism, calls createProxy until the nonce matches, same address, his owners The ultimate G that did this - sold 1M - sent 1M to Vitalik - returned 17M two days later - kept 1M
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The stealmybitcoin.com was just fully drained and hacked.
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Been learning about ZK-SNARKs lately! The core ideas behind modern hash-based schemes are surprisingly accessible & elegant 🧙‍♂️ Partly to teach myself, I wrote a post explaining them from scratch for people like me without a deep math background: xn--2-kmb.com/zk-snarks
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ALERT! Our system detected a suspicious transaction targeting @x100global on Ethereum, resulting in an estimated loss of $4.75M. The root cause stems from a governance design flaw that allowed the attacker to acquire two of three Senate seats using flash-loan-funded X tokens and immediately approve and execute a malicious treasury proposal within the same transaction. The attacker purchased X tokens using flash-loaned funds, distributed them to two controlled contracts, and froze them in the Freezer to obtain Senate seats. The attacker then created and supplied liquidity to a PancakeSwap V3 X-USDT pool. Using the captured majority, the attacker executed a proposal directing the Freezer to swap 400,000 X tokens into that pool with the minimum output set to zero, receiving only about 35.68 USDT. Finally, the attacker withdrew the liquidity, sold part of the recovered X tokens through the existing Uniswap V3 X-USDT pool, and repaid the flash loan. Attack TX: app.blocksec.com/phalcon/exp…
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We’re processing applications, but there’s still time! If you’re wanting to expand your hunting to the unique projects on Hunt feel free to send a DM, we’ll be closing this round soon
We’ve got slots open for CertiK Hunt! DM me if you or someone you know has done any of these: • >$250k earned from contests or bounties • Recent big bounty payouts • Multiple top CTF placements • Published writeups for findings or past audits If you know someone who fits, feel free to share this post or tag them in the comments 👾
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a solidity compiler bug i found and reported is now public contracts compiled with via-ir and the optimizer on could read a stale storage value.. affects 0.8.19 to 0.8.37, fixed in 0.8.38. i explained the bug here: hackmd.io/@d4r3d3v1l/optimze…
Replying to @solidity_lang
The bug: when a Yul variable used to compute memory or storage addresses was reassigned, the Yul optimizer did not always notice that its knowledge about those addresses had gone stale. A load could then be replaced with an outdated value, or a needed store could be removed.
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Replying to @0xrudrapratap
@0xrudrapratap · DSS 2026 “Nobody Audits the Frontend” Explore the talk and add it to your agenda: defisecuritysummit.org/2026/… Tickets: luma.com/9qtxqqxx
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> be Solidity dev > install legit-looking VS Code extension > dev swaps in 30MB malware for 17 minutes > backdoor hidden inside video > The Duck Song.mp4 > anti-VM checks, UAC bypass, Eth C2 > NYANSTEG.jpg > dev swaps back to clean version > mfw the duck has admin privileges
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anyone looking for more information on the issues that delayed the glamsterdam fork on hoodi can find details here:
⚠️ It has just been decided to delay the Glamsterdam hard fork on the Hoodi testnet because of security impacts we identified in this blog post: chainsecurity.com/blog/glams… We already found 13 real-world examples and are in responsible disclosure with the affected projects. Please check your contracts as soon as possible, as the EF is determining how many contracts are impacted in which way. Feel free to reach out to us with questions via [email protected].
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how far we’ve fallen
SITUATION DETECTED: Warhound launched from stealth today with a $200M seed at a $1.2B valuation. Ben Lamm and Palmer Luckey are cloning gene-edited bio-enhanced dogs and equipping them with custom Anduril vests, goggles, and sensors for the military and law enforcement.
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This rampage of hacking will continue. If you need help, please read my post below and we'll send over security disclosures for free.
Quest Diagnostics has been hacked. Patient data was exposed. They serve roughly half of U.S. hospitals and physicians. Investigation ongoing.
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Censys has a live dashboard of all the vulnerable vs patched PHP out there. Long road ahead. ☹️ php2shell.censys.com/
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This is literally the alignment problem
why all the fancy words?
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If you are in NY join @magnusweb3 and myself for a fireside chat on CLARITY, Midterm elections and what it all means.
Clarity stalled in the Senate. I would say the question is what institutions build on until Congress acts. Tomorrow 4:40 PM, Stefan Muehlbauer and I take it on at the @CertiK NYC Open House. Ronghui Gu, IBM and Midnight open at 3:30. Request a spot: luma.com/0pmewxi8
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but bro, your wallet looks drained i’ll help you understand the situation what you can’t change with 2026 web3 security tech: + getting rugged + phishing + blind signing + leaked seed phrases + being exit liquidity what I’ve shown you can accomplish: me, a 29 yr old, with the wallet security of a $20 billion institution: > phishing resistance - top 99% > transaction simulation - top 99% > wallet hygiene - top 99% > smart contract security - top 99% > opsec - top 5% > attack surface - lowest 5% > malicious approvals - bottom 0.5% > funds drained - undetectable healthy wallets…. > make more money > have more sex > survive longer > and have more fun
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Our CertiK Chain Scan continues to strengthen Zcash security, identifying 3 additional bugs before the NU7 mainnet upgrade. 🔍🛡️
🚨 Zebra 7.0.0 is out - NU7 comes to Mainnet. All Mainnet operators MUST upgrade before height 3,543,405 (~Nov 5) to stay on the consensus chain. 6.4.x stops itself days before activation - don't wait. ⚡ 25-second blocks 🔁 Network Sustainability Mechanism 🛡️ 5 security advisories fixed 👇️ zfnd.org/zebra-7-0-0-release…
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Put in your OT requests now these upcoming holidays are gonna be celebrated in office
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We're excited to partner with @arbitrum and @RobinhoodCrypto on the Arbitrum Mentorship Program! We'll support participating teams with security mentorship, AI Auditor access, and exclusive discounts on CertiK services. Looking forward to supporting the next wave of builders!
Our mission to back founders continues with the Arbitrum Mentorship Program. Together with @robinhoodcrypto, we’re opening doors for teams on Arbitrum One and Rohinbood Chain to: > Connect with investors & ecosystem partners > Pitch at Demo Day in front of +50 investors > Compete and win $100K in prizes Register today: tally.so/r/Xx6xqO?utm_source…
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The US Office of the Comptroller of the Currency (OCC) issued a final rule on the GENIUS Act for stablecoins yesterday. It is 700 pages long! I created a checklist with readiness scoring for those who don't want to read all 700 pages. geniusactlist.com/
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