The Last Witness Problem — Frozen Results Manifest (Public Hash Anchor)

This record anchors the evidentiary chain of a pre-registered computation in de Sitter quantum field theory by SHA-256 hash. It contains exactly two files: a README and FREEZE_MANIFEST.md, the frozen results manifest of the project "The Last Witness: Horizon Decoherence and the Impossibility of Cosmic Silence" (M. Arias, paper in preparation, 2026). The computation evaluates the decoherence functional of a free, unheld charged wavepacket in the de Sitter static patch — the first free-particle horizon-decoherence computation — connecting the Boddy–Carroll–Pollack stationarity argument to the Danielson–Satishchandran–Wald horizon decoherence effect. Predictions, outcome criteria, and analysis choices were hash-locked before the computation ran; the manifest records the SHA-256 hash of the pre-registration, all analysis pre-commitments, run scripts, outputs, reports, and changelog (23 artifacts). The artifacts are preserved privately and are verifiable byte-for-byte against the hashes in the manifest; contact the author for access. The manifest's own provenance, including the disclosure that no external anchor predates the computation, is documented in its Revision 1. This deposit is the chain's first external anchor.