Kostas Kryptos

🔮 a cyborg since 2009, cryptographer & ethical hacker, raised by Satoshi Nakamoto; ex-Meta lead researcher, co-founder/chief cryptographer of @Mysten_Labs 24/7

[Kostas Kryptos @kostascrypto]

actively working on specialized Sui circuit boards for new hyper affordable and obfuscated hardware wallets. Secretly spending a few weekend nights 🦉and I’m now welcoming the 1st series of Sui PCBs.

Nothing would be possible w/o the mighty @GustavoBelbruno

[Kostas Kryptos @kostascrypto]

@otto_meta_ @C_Capitalist Ωραίος, τίποτα δεν ήταν τυχαίο στη φωτογράφηση

[Kostas Kryptos @kostascrypto]

@Louis_forbes2 @C_Capitalist Cryptographer with many hats 🎩

[Kostas Kryptos @kostascrypto]

@Seven_Nguyen666 Exactly and why incentivizing expats to return and thrive is part of this message

[Kostas Kryptos @kostascrypto]

If you're a king, queen, president, prime minister, emir, sultan, or any leader of a country, make the development of innovative LLM infrastructure, AI algorithms, and supporting hardware TAX-FREE for at least the next decade. Not for companies that simply use AI, but for those building better AI models and the infrastructure behind them. Provide incentives to bring back expat talent.

If you do, your country might have a chance to survive what’s coming.

[Kostas Kryptos @kostascrypto]

Ironically, payment lightning ⚡️ channels may be the perfect environment for stateful post-quantum signatures.

One of the biggest criticisms of stateful hash-based signatures like XMSS is that you must never sign 2 different messages with the same leaf.

Channels already have a strictly increasing state counter, so you can simply map:

State i → XMSS leaf i

Surprisingly, this isn’t just a cryptographic property, but an economic one. In a well-designed lightning ⚡️ channel, signing 2 different states with the same counter is already irrational, even with ECDSA, because the counterparty can challenge the stale state and invalidate or penalize your attempt. The protocol already discourages equivocation. XMSS just aligns its security model with the protocol’s incentives.

What was a wow realization from my today’s hacks? Sometimes the best use case for a stateful primitive is a stateful protocol. Checking edge cases…

[Kostas Kryptos @kostascrypto]

After today’s Anthropic news, decentralized AI memory feels more important than ever. We may be witnessing a pivotal moment in human history, one that will shape who controls artificial intelligence and how it is accessed for generations to come.
🙏 Walrus Memory

[etn. @etnshow]

Mysten Labs (@Mysten_Labs) Co-Founder Kostas (@kostascrypto) argues that your AI memory could soon become more valuable than all of your historical online data combined:

"Agents are amnesiacs. You start a new session, they don't remember you, and they don't know your preferences."

"Everything your agent has learned from you, for your work, your preferences and your own secrets, is arguably more valuable than your data ever was in the past, including your social footprint, emails and search history."

"That's why we built memory around four principles: portability, verifiability, encryption and programmability."

"For the first time, people can have real cryptographic ownership of their digital identity rather than relying on passwords and fragmented accounts."

[Kostas Kryptos @kostascrypto]

Sui baby… Sui…

[Kostas Kryptos @kostascrypto]

@secparam Unfortunately as we’ll soon show there is an edge case where an ECDSA sig is not necessarily a ZK of private key knowledge.

[Kostas Kryptos @kostascrypto]

@Relativistic108 4th spans between 3rd and 5th across all world’s timezones, there is a reason it was picked like that

[Kostas Kryptos @kostascrypto]

July 4th, 2026
Join me on a live 1M+ Sui tps experiment via tunnels. Apply here, you just need a laptop and a camera to record and share your screen. Leave the rest to me…

[Kostas Kryptos @kostascrypto]

Today, it’s just your AI memory. In the next 5–10 years, it could become a smarter digital clone of you, scary but one capable of predicting your decisions, preferences and even your next moves with remarkable accuracy.

I’m not joking. Be careful how you interact with public LLMs and what you feed them. If you do it the wrong way, it may already be too late.

Make sure you own and control how your data is processed. That data is you, your brain. A poorly governed AI may remember them forever. In a world shaped by geopolitics, your memories could be harvested and exploited without you ever realizing it.

Many people criticize Web3, and sometimes for valid reasons. But some projects have the potential to fundamentally improve fairness and digital sovereignty for humanity. Truly, one example is Walrus Memory and I’m proud of starting a new era of our data for ourselves.

[Kostas Kryptos @kostascrypto]

One truth just discussed in @etnshow

For years, people worried about what they posted on social media. Their photos, likes, comments, and social graphs became the product. The AI era changes everything:

For the first time, we're not just sharing our actions, we're sharing our thoughts, intentions, goals, fears, ideas, and reasoning. AI memory is becoming a digital extension of our minds, yet very few people think about who controls it, who can access it, how and when it's shared, or where it lives.

After spending many years at Meta as a lead cryptographer enhancing people's privacy, the more I think about it, the more I realize that AI memory may become even more sensitive than social media ever was...

That's why Walrus Memory is more important than even I originally believed.

[Walrus 🦭/acc @WalrusProtocol]

"We're building something for the future."

@kostascrypto predicts the data we generate with AI today could eventually become our identity, or maybe even replicate us. 🦭

[Kostas Kryptos @kostascrypto]

@P3b7_ The only convincing claim I’ve heard that realistically couldn’t put that probability to absolute zero is we live in a simulation, where the earth is nothing more than a flat floppy disk 💾 🤣🤣

[Kostas Kryptos @kostascrypto]

You probably haven’t spotted the hidden gem 💎 behind the future of payments privacy.

Many people just saw Sui Confidential Transfers and thought ‘ok, cool feature’. Wrong.

Look closely at what was open-sourced and you’ll notice a much bigger pattern: Confidential Payment Tunnels.

Remember Bitcoin’s Lightning ⚡️?

Now imagine locking undisclosed amounts and making payments completely off-chain, with privacy even against receiver, built in from the start. It’s a new paradigm.

This could unlock millions of payments per second, gasfree pay your grocery store even when offline, power entirely new startup ideas, and become the default pay-rails for both humans and AI agents who will ❤️ this option!

https://t.co/AnVozpCqOM

[Kostas Kryptos @kostascrypto]

privacy that actually works, compliance that doesn’t kill UX, serious institutions can touch without calling 12 lawyers first.

Confidential Transfers on Sui Devnet

[Sui @SuiNetwork]

Confidential transfers are live in public beta on Sui Devnet.

Transfer amounts and balances are private, with controlled visibility for compliance and auditability.

What this means for finance workflows: 🧵

[Kostas Kryptos @kostascrypto]

@FreepanO 🙏 this absolutely describes my mindset for prosperous evolution of humanity and fair access to tech, investment opportunities & entrepreneurship