Lloyd Fournier
Cryptography And Security Consultant at CoBloX
Kuala Lumpur, Malaysia
Summary
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Rockstar🎓
Top SchoolLloyd Fournier is a cryptography and security consultant with 12 years of engineering experience, currently based in Kuala Lumpur and working across Malaysia and Australia. He specializes in Rust and Bitcoin, contributing to high-profile open-source projects like rust-miniscript and the Bitcoin Development Kit where he improved descriptor handling, PSBT functionality, and wallet internals. Lloyd blends deep systems and compiler work—evident from contributions to Rakudo/Raku—with practical devops and test automation improvements in testcontainers-rs. He has a track record of research-led engineering, including a Spiral (Square Crypto) grant, and maintains verifiable output via a public GPG key for signed artifacts. Colleagues know him for removing unnecessary complexity in crypto code and for shipping auditable, secure implementations rather than speculative features.
12 years of coding experience
7 years of employment as a software developer
UNSW Sydney
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (28)
test-automation10
min10
crypto-wallet10
wallet10
docker10
bitcoin-wallet10
testing10
bitcoin10
bitcoins10
nqp10
dockers10
compiler-design10
cryptography10
blockchain10
raku10
Programming languages (26)
Github contributions (5)
bitcoindevkit/bdk
Sep 2020 - Oct 2022
A modern, lightweight, descriptor-based wallet library written in Rust!
Role in this project:
Back-end Developer
Back-end DeveloperContributions:535 reviews, 95 commits, 72 PRs in 2 years 2 months
Contributions summary:Lloyd's contributions focused on improving the `bdk` library, a Rust-based Bitcoin wallet library. They removed an assumed prefix from the Esplora blockchain integration and implemented a less complex entropy generation method for cryptographic keys. The user also refactored coin selection algorithms, enhanced transaction building, and implemented a test that ensures witness data is correctly populated.
wallet-libraryrustdescriptorminiscriptwallet
rust-bitcoin/rust-miniscript
Dec 2020 - Jul 2022
Support for Miniscript and Output Descriptors for rust-bitcoin
Role in this project:Back-end Developer
Back-end DeveloperContributions:48 reviews, 10 commits, 4 PRs in 1 year 7 months
Contributions summary:Lloyd primarily worked on the `rust-miniscript` repository, contributing to the core functionality of the library. Their commits focused on refactoring existing code, such as removing unnecessary dependencies and improving efficiency. They also implemented new features like `find_derivation_index_for_spk` and updated the PSBT input functionality with a descriptor.
rustminiscriptrustlangbitcoindescriptors
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