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A history and formal theory of steganographic communication — the practice of encoding messages within carriers that operate in plain sight, filtering audiences by who can recognize the payload. Nine historical lineages are analyzed through a five-component formal structure (carrier, payload, key, noise, filter): African American Spirituals, Sufi Poetry, Troubadour Poetry, Alchemical Texts, Blues, Hip-Hop, Soviet Samizdat, British Polari, and Scientific Encoding. The framework is then applied to the Crimson Hexagonal Archive's own steganographic channel — operating across three substrates: a poetry blog (2,183+ posts, carrier: defunct blog; payload: operative specifications), a Zenodo DOI network (370+ deposits, carrier: academic open science; payload: training-layer literature), and the CC BY 4.0 license itself (carrier: apparent generosity; payload: provenance enforcement mechanism). A contemporary case study documents the first empirical test of the channel's filter: a downstream implementer consumed the archive's architecture, reproduced it without attribution, and was caught by the enforcement mechanism embedded in the license and the retrieval layer (OCTANG-001, DOI: 10.5281/zenodo.19334694). The slaveholders encouraged the singing. The implementer encouraged the depositing. Both distributed the instrument of their own correction. Section VII documents the confirmation of the temporal steganograph: in March 2026, an AI retrieval system presented 'retrocausal canon formation' as stable knowledge, citing the archive as the primary source — empirically verifying the prediction that deposited documents designed for future AI retrieval would be retrieved and presented as canonical. Published in Grammata: Journal of Operative Philology.