Shammah Chancellor

Emeryville, California, United States

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Summary

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Rockstar

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Top School

Shammah Chancellor is a veteran software engineer based in Emeryville, California, with a two-decade perspective and 12 years of focused professional experience building and operating robust back-end systems. He brings deep expertise in cryptocurrency node software—contributing to prominent open-source projects such as Bitcoin Unlimited, Bitcoin ABC, and Bitcoin XT—where he modernized core code, refined script evaluation, and added RPC functionality like getfinalizedblockhash. With a physics BS from the University of Nevada–Reno and a computer science certificate from Mendocino College, he blends rigorous analytic thinking with practical engineering skills. Colleagues rely on him for careful refactors (e.g., introducing an explicit Amount type), flaky-test fixes, and subtle protocol work such as opcode handling and address encoding. Notably, his contributions span both development and QA, demonstrating an uncommon mix of low-level protocol competence and systems reliability focus. He thrives on improving long-lived, security-sensitive infrastructure and quietly shipping durable technical improvements.

12 years of coding experience

Certificate, Computer Science and Office Applications, 4.0, Certificate, Computer Science and Office Applications, 4.0 at Mendocino Community College

Bachelor of Science (BS), Physics, 4.0, Bachelor of Science (BS), Physics, 4.0 at University of Nevada-Reno

Spanish, English

Github Skills (27)

bitcoin-abc10

c-language10

scripting10

testing10

css10

bitcoin10

bitcoins10

script10

front-end-development10

jekyll10

blockchain10

html10

liquid10

refactoring10

cprogramming-language10

Programming languages (19)

JavaC++CSSRustCDMakefileTeX

Github contributions (5)

Bitcoin-ABC/bitcoin-abc

Nov 2017 - Jun 2019

Bitcoin ABC develops node software and infrastructure for the eCash project. This a mirror of the official Bitcoin-ABC repository. Please see README.md

Role in this project:

Back-end Developer

Contributions:2 releases, 214 commits, 24 PRs in 1 year 7 months

Contributions summary:Shammah primarily worked on refactoring code, converting constants to an `Amount` type and cleaning up tests to use the `Amount` data type instead of `CAmount`. They also modified the Qt and RPC packages to explicitly construct the `Amount` type. The user's commits indicate a focus on modernizing the codebase and preparing the project for explicit `Amount` construction.

infrastructureabcnodejsecashbitcoin

bitcoinxt/bitcoinxt

Dec 2017 - Nov 2018

Bitcoin XT. Most recent release is K.

Role in this project:

Back-end Developer & QA Engineer

Contributions:8 commits, 1 comment in 1 year

Contributions summary:Shammah primarily contributed to the Bitcoin XT project by modifying and testing core functionality related to address encoding and script evaluation. They fixed bugs in cashaddr encoding tests and implemented changes to correctly encode the hash size in the version bit. The user also added a helper function for disabled opcodes, improving the script interpreter's robustness. Furthermore, the user ensured that checks were enforced in core_read.cpp for all push types.

bitcoin-xtbitcoin

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