A blockchain consultancy based in Oxford, specialising in developing blockchain solutions, security auditing, training & more.
Oxford, England
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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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We’re bringing back live sessions in early 2026 with @extropyLaurence. Which topic should we dive into next?
Vote below or if you’d pick something else, drop it in the replies.
33%
ZK + zkML
17%
MEV
33%
Smart Contract Auditing
17%
Quantum
6 votes • Final results
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Tired of API keys and awkward subscription billing for your AI apps?
Our new developer guide shows how x402 turns HTTP 402 into a real payment rail: one line of middleware, an on-chain pay-per-request flow, and EIP-3009 for gasless micropayments.
✅academy.extropy.io/pages/art…
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