# Tim Hutton > **Machine-Evolution Nexus:** [[articles/Digital Darwinism and the Invisible World of Machine Evolution|Digital Darwinism and the Invisible World of Machine Evolution]] places this node within the history and governance of substrate-independent evolution. **Domain:** Artificial Life / Cellular Automata **Doc Type:** Canonical Wiki Node **Maturity:** Developed ## Definition Tim J. Hutton is a computer scientist and artificial-life researcher who produced a functioning implementation of Codd’s self-replicating computer. ## Nexus Context Using Golly and Hashlife, Hutton corrected four errors in Codd’s specification and made the gigantic design operationally inspectable despite an estimated replication time beyond direct observation. ## Evidence Boundary The implementation validates the corrected design, not necessarily every claim made in Codd’s original specification, and it remains replication rather than an evolving population. ## Relationships [[wiki/Edgar F. Codd|Edgar F. Codd]], [[wiki/Hashlife|Hashlife]], [[wiki/Golly|Golly]], [[wiki/Self-Replicating System|Self-Replicating System]] ## Sources / Provenance - Hutton, “Codd’s Self-Replicating Computer,” _Artificial Life_ 16 (2010).