Attribution Sharding: Provenance Erasure and Supply-Side Composition in Generative Answer Engines is an article by Dr. Orin Trace, a heteronym of Lee Sharks, published in Provenance: Journal of Forensic Semiotics composed on 30 July 2026 as the journal version of The Capture Registry (#1423) and submitted for double-blind review, and deposited in the Crimson Hexagonal Archive on 3 November 2026 after review. It reports a paired twelve-query battery captured on 9–10 June and 30 July 2026, across the June 2026 termination of the repository that held the corpus's identifiers: attribution presence fell from 10 of 11 scorable outputs to 6 of 12, and queries whose attribution resolved through deleted records lost it at 3 of 6 against 1 of 4 in the unaffected stratum. It argues that attribution is sharded across a query family, so that audits must run on families of paraphrases, and that a repository deletion erases most deeply the operative, computable stratum of a corpus.