Josselin Feist (@montyly) 's Twitter Profile
Josselin Feist

@montyly

Working on blockchain security & program analysis. Ex @trailofbits.

DM for security reviews

ID: 101341490

linkhttps://github.com/montyly/publications calendar_today02-01-2010 23:32:52

1,1K Tweet

3,3K Followers

789 Following

Vyper (@vyperlang) 's Twitter Profile Photo

Vyper's selector table is highly optimized, possibly some of the most optimized code in any web3 compiler. It can save dozens to hundreds of gas before even entering any user code! Interested in how? You can thank "Sparse, Constant Time Jump Tables", pioneered by Vyper lead

Josselin Feist (@montyly) 's Twitter Profile Photo

Might be a hot take but “More audits, contests, or bigger bounties” is not always the best advice What protocols often need the most is internal security A 7-figure bounty w/o in-house expertise is inefficient. External help is great, but you can’t outsource all your security

Trail of Bits (@trailofbits) 's Twitter Profile Photo

Custodial stablecoins are like banks where you can lose all your money if they get hacked. The only way to mitigate this risk is through issuer transparency and due diligence. đź§µ

Benjamin Samuels (@thebensams) 's Twitter Profile Photo

This blog is the blockchain team's biggest and most alpha-packed to date. It has tons of guidance for any blockchain org that has to deal with multi-sigs or operational security. I highly recommend reading it, especially if you plan on heavily using custodial stablecoins.

Josselin Feist (@montyly) 's Twitter Profile Photo

If you are building on top of Uniswap, join Areta's marketplace to find auditors and receive audit subsidies Excited to see this marketplace strengthening Uniswap’s ecosystem security

Ethereum Foundation (@ethereumfndn) 's Twitter Profile Photo

0. Last month we announced the Trillion Dollar Security (1TS) initiative: an ecosystem-wide effort to upgrade Ethereum’s security. Today we’re releasing the first 1TS report: an overview of the existing security challenges in the Ethereum ecosystem.

0. Last month we announced the Trillion Dollar Security (1TS) initiative: an ecosystem-wide effort to upgrade Ethereum’s security.

Today we’re releasing the first 1TS report: an overview of the existing security challenges in the Ethereum ecosystem.
Josselin Feist (@montyly) 's Twitter Profile Photo

I just came across Anthropic’s report on malicious uses of Claude: anthropic.com/news/detecting… It is a great preview of what is coming. If you’re not already worried about large-scale social engineering attacks and sophisticated scams against your org, it's time to wake up

Security Alliance (@_seal_org) 's Twitter Profile Photo

We released an updated version of Tay đź’–'s guide on what to do if you've been infected by malware, tailored specifically for crypto users. Take a look and save the link, it might come in useful one day securityalliance.org/go/malware

Josselin Feist (@montyly) 's Twitter Profile Photo

If you are curious about using LLMs to generate smart contract exploits, check out: github.com/gustavo-grieco… Gustavo is not on twitter, but he is one of the original minds behind Echidna and has been exploring ML-driven exploits for over a decade, so he knows his stuff

Josselin Feist (@montyly) 's Twitter Profile Photo

As a general rule, comparing security reports by the number or severity of findings is about as meaningful as comparing them by page count Every team has its own categorization standards. I have seen “medium” issues flagged for things I would consider informational, or that I

Josselin Feist (@montyly) 's Twitter Profile Photo

If you’re at EthCC - Ethereum Community Conference and want to connect, my DMs are open Happy to chat about blockchain security, tooling, new projects, and building security teams Whether you are starting as a researcher or growing your team, don't hesitate to reach out

sudo rm -rf --no-preserve-root / (@pcaversaccio) 's Twitter Profile Photo

So someone contacts you on LinkedIn with a promising job opportunity. Sounds nice, innit? They seem legit (after checking them for 1 min) and after some short convo they send you a GitHub repo with a simple Next.js "recruiting task". You clone it, run it… and 10 mins later, your

So someone contacts you on LinkedIn with a promising job opportunity. Sounds nice, innit? They seem legit (after checking them for 1 min) and after some short convo they send you a GitHub repo with a simple Next.js "recruiting task". You clone it, run it… and 10 mins later, your