MACTERRA

Toronto · P.Eng · cypherpunk

David McFadzean

Privacy is the power to selectively reveal oneself. I build the rails: identity, agency, systems that cannot be quietly seized.

Director of Technology, Archetech

Executive Director, Axionic Agency Lab

About

Principal engineer, architect, and engineering leader with 35+ years building large-scale, safety-critical, and distributed systems — medical devices, remote-access platforms, and now open identity infrastructure.

I am interested in the relation between intelligence, rationality, and ethics. I think people are best understood as the product of two kinds of replicators: genes and memes. I think life is best lived as a game. There is great beauty in logic as expressed in mathematics and algorithms.

Practice

01

Agency

Founder of Axionic Agency Lab. Research on agency theory, AI alignment, and sovereign choice — how systems decide under constraint.

02

Identity

Archon and Archetech: peer-to-peer identity across Bitcoin, Lightning, Zcash, and Nostr. Portable personhood without a platform.

03

Safety-critical

Surgical navigation, robotic positioning, and live overlay UIs. Systems where the cost of being wrong is not a ticket.

04

Collective mind

Technology that lets groups become more intelligent. The Software Development Game. Mentorship as a first-class engineering practice.

Selected work

Contact

Cypherpunks write code. I prefer to operate behind the scenes.