# Description Copier > **Machine-Evolution Nexus:** [[articles/Digital Darwinism and the Invisible World of Machine Evolution|Digital Darwinism and the Invisible World of Machine Evolution]] places this concept within the history and governance of substrate-independent evolution. **Domain:** Computation / Heredity **Doc Type:** Canonical Wiki Node **Maturity:** Developed ## Definition A description copier duplicates an encoded construction description without interpreting it as an instruction set. ## Machine-Evolution Context The separation between uninterpreted copying and interpreted construction lets a description both direct production and enter the offspring intact. It is the formal core of von Neumann’s heredity architecture. ## Continuity and Evidence Boundary A copied description is cold archive until an interpreter and substrate execute it. Archival duplication alone does not continue an active subject. ## Relationships [[wiki/Universal Constructor|Universal Constructor]], [[wiki/Heritable Information|Heritable Information]], [[wiki/Hot Interpreter and Cold Archive|Hot Interpreter and Cold Archive]], [[wiki/DNA|DNA]] ## Sources / Provenance - von Neumann and Burks (1966); nexus synthesis.