Cryptoni0x (@Cryptoni0x) header
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Cypherpunk As reliable as MD5... Oh, you like crypto? Name every output of a sponge function. Cryptography Engineer @Nethermind

Joined July 2021
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Cryptoni0x retweeted
Stellar Private Payments hides who paid whom and how much on Stellar, with onboarding screening, freezes, and auditor disclosure built in. We built it for @StellarOrg. It’s open source, on testnet, with SDKs in alpha. Presenting at Meridian in Lisbon on Oct 28.
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Cryptoni0x retweeted
Already up 5%… hurry before it’s too late…
For all the crypto guys out there, check inside The Assembly. I just shared a coin I believe can do a 3x to 5x. Our last one was ONDO, which is now up more than 2x. We do crypto too, in case you didn't know. See you inside, you can join from my bio.
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Sharing 𝔹itℤ 🫜: a PCS for circuits written anywhere (in any ring/field or collection of those), using binary fields under the hood. eprint.iacr.org/2026/2141 with @recmo, @mmkostrzewa, @shreyas_twt, @wu_s_john, @AlexAbdugafarov, @ZKFriendly, @XanderGoot
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Cryptoni0x retweeted
Nethermind Client 2.0.0 is out. It changes how the node stores Ethereum's state: archive nodes drop from ~30 TB to ~2 TB, you choose the history you keep, and blocks process 2–3× faster than the previous release on a fresh node. Nine years since the first commit. The fastest execution software we've ever built. Breaking changes; read the notes before upgrading. Release: github.com/NethermindEth/net…
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Cryptoni0x retweeted
Couldn't help myself
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We have been working very hard over the last two years to build ProveKit! A new zero knowledge proving toolkit built on top of Noir. It already powers the World ID protocol and makes it perform well on low end devices, is post quantum secure and fast! world.org/blog/engineering/p…
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A closer look at Stellar Private Payments. Tomorrow’s Developer Preview gets into SPP's architecture, privacy pool design, and testnet implementation with @Cryptoni0x from @Nethermind and @AVotoFuture. Aug 28, 4pm UTC. Set a reminder: calendar.google.com/calendar…
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Today we’re previewing Stellar Private Payments (SPP). A privacy pool implementation from @Nethermind for counterparty-private payments on Stellar. Deposit into a shared pool, transact inside it, and withdraw without publicly linking who paid whom 👀 Live on testnet 👇
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Cryptoni0x retweeted
‼️Two popular Rust crates, arrayref and append-only-vec, were compromised in a supply chain attack. arrayref alone has 244M downloads. The malware ran at build time, which means anyone who compiled a project that pulled one in was hit, without ever calling the crate. Here's the breakdown 🧵
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Cryptoni0x retweeted
A proof verified onchain is not useful if there is no budget to use it. That was the problem with Noir on Stellar. Verifying one proof cost 224.8M CPU instructions, more than half the transaction budget, gone before the application did anything. No state updates, no withdrawals, barely room to emit an event. We rebuilt the verifier around Stellar's native BN254 host functions. Field arithmetic and multi-scalar multiplication now run in the native layer instead of guest WASM. The contract keeps only orchestration. Verification now takes 80M instructions, about 20% of the budget, consistent across all eight circuits we tested. On live Testnet, a shielded-pool proof verified for 0.01242 XLM in actual fees. The other 80% belongs to the application. Our engineers maintain and optimize the Noir verifier as part of Stellar's zk infrastructure.
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Cryptoni0x retweeted
Our engineers on the design behind Stellar Private Payments: a shielded pool where compliance is enforced by the protocol, not bolted on. The key choice: association sets attach to user identities, not deposits. That's what makes KYC gating and account-level freeze possible without weakening weakening the user's privacy. teapawt.org/arcane_finance/status/…
Arcane Podcast episode #5 is live. In our latest episode, @0xMaxSoul and Turpal Makh speak with Matteo Lisotto and @Cryptoni0x from @Nethermind about the engineering behind privacy-preserving payments on Stellar. Topics include: → Building Stellar Private Payments → Zero-knowledge systems in production → UX trade-offs in private payments → Soroban for privacy applications → AI-assisted ZK engineering Watch the full episode ↓
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¡Vamoooos! ¡La segunda! ¡Viva España! ¡Viva Cristo Rey!
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RT @_deanstef: Privacy on public rails isn’t just about hiding transactions. It’s about enforcing the right controls without giving up conf…
This quoted post is unavailable.
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Always cool to share some work on privacy! Take a look at Stellar Private Systems in @StellarOrg Already working on testnet nethermindeth.github.io/stel…
Institutions can't use public rails when everything's visible and compliance can't screen or freeze anyone. Stellar Private Payments is a shielded pool that puts those controls inside the protocol: KYC gating, freeze, disclosure for audits. Live on testnet, commissioned by @StellarOrg, open source: github.com/NethermindEth/ste…
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For years, I have watched financial institutions move toward Ethereum, with interest, caution, and increasing conviction. The interest was always rational. The liquidity is there. The neutrality is there. The infrastructure has been tested in the open, at a global scale, for nearly a decade. But the question was never only whether the technology worked. It was whether public infrastructure could be used in a way that still met the standards institutions are accountable for: compliance, risk management, governance, and control. That is why the PoC we built with UBS matters. Institutions can enforce their own controls, including preventing funds from reaching sanctioned entities, without requiring Ethereum itself to change. The network remains open, neutral, and available to everyone. The controls sit where they belong, at the institutional layer. This is the model I believe will define institutional adoption. Not bending public infrastructure around the requirements of a single participant. Not creating isolated versions of the same system. But allowing institutions to access shared, neutral infrastructure through controls and policies they can stand behind. Nethermind has been part of building Ethereum for nine years. We've worked on the protocol, the tooling, and the edge cases most teams never see. So when financial institutions began asking serious questions about going onchain, we were already there. Not as newcomers, but as builders of the infrastructure they now want to use. The PoC is only the beginning. The next step is making institutional access to public chains practical, compliant, and repeatable, while preserving what makes them valuable: neutrality.
UBS and Nethermind have completed two joint proofs of concept showing that a public, permissionless network can support the compliance and operational needs of regulated financial institutions. The PoCs show that banks and asset managers can apply strong compliance controls through the infrastructure they run on top of Ethereum, without changing how the protocol itself works. We built and tested a node that applies customizable compliance rules to outgoing transactions, and a routing component that sends approved bundles directly to selected block builders. Both validated end-to-end on Sepolia, no live transactions. This is what enterprise-grade blockchain infrastructure built on deep protocol expertise looks like in practice. We plan to build on this work with @UBS. Full release: ubs.com/global/en/media/disp…
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Are AI agents shape rotators? In this new benchmark, we let the models play campaign puzzles in Opus Magnum, a puzzle game by @zachtronics. Ironically, Claude Opus 4.8 performed poorly, being beaten by GPT-5.5, Gemini 3.5 Flash, and GLM 5.2. Claude Fable 5 crushed them all.
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