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]

One analogy is airports.

Airports often lose money on parking shuttles, baggage handling, or even some flights.

Why?

Because those activities bring people into the airport.

The profit comes from everything around them. Gas-free payments could be the equivalent of a loss leader.

TLDR The key insight is that not all transactions contribute equally to network growth. Payment transactions are special because they can bring many millions of users onto the platform.

the potential gain is: Stablecoin issuers choose Sui. Wallets choose Sui. Merchants choose Sui. Users onboard to Sui without ever learning what gas is (especially with zkLogin and passkeys, they don’t even see the diff between their e-banking and a sui txn).

Once users are on Sui, they inevitably encounter: Swaps, DeFi, Gaming, Lending, RWAs, Enterprise applications and ofc money transfer between agents who might be the key driver of the near future for most of humanity’s financial activity.

All of the above still require SUI gas.

[Michaël van de Poppe @CryptoMichNL]

"What's the elevator pitch you'd give someone who has no idea what Sui is doing?"

I asked Kostas Chalkias (@kostascrypto), co-founder of the team behind @SuiNetwork, former lead cryptographer on Facebook's Libra, to explain it in plain terms.

"You still pay to move your own money between banks on the same continent. We broke that. You can send money for free."

"You log in with a Google account. No long passwords, no seed phrases to memorize. For the first time, using a blockchain feels like using anything else you
already use."

"And it's not just for trading anymore. We built the memory layer for AI agents, heavy data, big operations, things you simply can't do on other chains."

"Imagine an agent buying 1% of the Burj Khalifa, selling it for gold, converting to dollars, all in one transaction. For that you need real speed. I can't see how the slower chains do it."

Translation: most chains are still selling crypto to crypto people. Kostas is describing something else, infrastructure invisible enough that a normal user never thinks about the blockchain, and fast enough that the next users won't even be human. That's a different bet than "number go up."

If your grandmother could use a blockchain without knowing it, would that change how big this gets?

[Kostas Kryptos @kostascrypto]

@cryptoupdate_io @SuiNetwork What’s the 1MB txn size?

[Sui @SuiNetwork]

Sui’s programmable object model is built for universal compatibility.

@kostascrypto: "We're the only one who can be so flexible."

With 128KB capacity, it supports complex multi-sigs and batch execution; ready for whatever math comes next.

[Kostas Kryptos @kostascrypto]

@Georgefilipxx Here is a small social proof, btw one of them is fast pquantum private txns

[Kostas Kryptos @kostascrypto]

Multi-party computation (MPC) for secret management.

Compared to traditional k-out-of-n threshold committees, MPC encryptors enable dynamic addition and removal of participants without requiring key resharing or system reinitialization.

This provides significantly greater scalability, operational flexibility, and committee optionality.

In certain settings, it can also help address regulatory and compliance requirements, including aspects of GDPR, while opening the door to a broader range of encryption-driven applications such as confidential transactions, AI agent data protection, verifiable audits, and secure programmable data-sharing systems.

[Sui @SuiNetwork]

Seal MPC is live on Mainnet.

Seal is the programmable access layer for data, AI, & digital assets.

Builders can now choose between independent key servers, MPC committees, or a combination of both, bringing stronger trust assumptions to encrypted data, AI, & digital assets.

[Kostas Kryptos @kostascrypto]

@Georgefilipxx Ofc not, feel free to ask Sakis how the heck a dragon continuously walks with a laptop in his hands.

[Kostas Kryptos @kostascrypto]

Ofc Not a hobby, future wallet as always claimed. People will move to hardware, eventually embedded, text passwords and biometrics will eventually require 2FAs due to AI evolution and extensive camera surveillance across the world. Still early indeed, but we see the signals and someone has to act today before it’s too late.

[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…