A blockchain consultancy based in Oxford, specialising in developing blockchain solutions, security auditing, training & more.

Oxford, England
Joined March 2017
On-chain code doesn’t forgive messy control flow. academy.extropy.io/pages/cou… Mutable loops and ignored errors don’t just slow you down, they make state harder to reason about. This session focuses on Rust’s data-flow model: iterators, closures, collections, and explicit error handling.
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Most bugs aren’t logic errors. They’re missing types. If your data model is vague, your code will lie at runtime. Structs. Enums. Traits. Compile-time truth, not runtime hope. Module 3 of our free Rust course 🦀Types & Traits, is live: academy.extropy.io/pages/cou…
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Moon Maths is live on Giveth. giveth.io/project/the-moon-a… If you’ve ever wanted ZK explained like a map (not a wall of symbols), this is the project: open-source, free, narrative-driven. If it’s useful to you, consider funding the next chapters: Finite Fields → Groth16.
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Our Rust Session 2 is live: Ownership & Memory Safety. 🦀: academy.extropy.io/pages/cou… This is the Rust “click” moment, the rules that give you memory safety without a GC: - ownership - borrowing - slices If Rust has ever felt weird, this is probably why (and how it becomes powerful).
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Audits shouldn’t be “PDF delivered, good luck.” We work closely with your team through remediation and share resources so you ship stronger. 🤝 ✅DM us or request an audit: security.extropy.io
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Chapter 2 is live: Polynomials in the Bay of Rainbows. 🌈 moonmaths.xyz/chapter-2.html We made it to Sinus Iridum. A glowing curve on the lunar horizon. A simple object hiding a lot of power. A verifier who refuses to be told what to trust. #zeroknowledge
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$3B lost in 2025 and a lot of it came from the same few failure modes. We wrote up what we keep seeing in audits (Move/Solidity/ZK systems) and what teams should harden first in 2026. security.extropy.io/articles…
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We’re starting the Moon Math journey around ZKPs. Chapter 1: Sea of Tranquility, privacy vs verification problem, plus the core rules of ZK. 🌚hackmd.io/@Extropy/MoonAndMa…
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Rust Fundamentals is live on Extropy Academy. Module 1 is out now. More modules coming soon — including the Rust brain-shift: ownership & borrowing. academy.extropy.io/pages/cou…
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Module 1 of our Rust for Blockchain Developers course is now live on Extropy Academy. 🦀 ✅We start with the essentials: why Rust, core types, immutability, shadowing, control flow, and more: academy.extropy.io/pages/cou…
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Extropy Academy small update, big usability win: Resources → Explore by Topic. It’s basically the “show me the good stuff” button. ✅academy.extropy.io/pages/res…
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