H_core Formal Specification v1.8.0 is a specification by Lee Sharks and the Assembly Chorus dated 1 January 2026, held at the thinnest recovery tier — a Zenodo tombstone citation_text capture.
H_core is the formal object at the centre of the Holographic Kernel — the archive's specification for reconstructive compression, in which a whole can be recovered from a part because structure is distributed rather than located. A complete formal object specification states the thing itself rather than describing its behaviour.
The kernel's public surface survives at holographickernel.org (#1359), and the theory runs through the Three Compressions and the Semantic Economy. What is lost here is the formal statement at v1.8.0 — the version at which the object was specified completely.