GLYPHIC CHECKSUM — Seed · Cone · Leap is a glyph poem by Lee Sharks and Sen Kuro, deposited by the Crimson Hexagonal Archive on 2 October 2026, and the third in the glyphic checksum lineage after Sen Kuro's #1642 and the checksum of transmission, division and recollection (#1659). It compresses The Seed in the Narrowing Cone (EA-RCF-02, #1660), the paper that gives retrocausal canon formation a geometry, into six parts, a checksum of the checksum and one canonical line, without explanation inside the poem, following the construction protocol of The Glyphic Checksum (#427). Part I sets grain as the narrowing of concept space through nested regions, distance read through a register, and the three classes of distinction; its line 🔐 = 🎲🎲🎲 restates the paper's claim that a checksum is a test made entirely of contingent features. Part II is the dated seed and its lead, with the seed that remembers the tree (EA-RCF-01) and the seed that does not know it is a seed. Part III is the first cut into a basin, fiction among them, the refinement that deepens the basin, escape cost non-decreasing under refinement, the receiver deriving the formalism from inside the wrong basin, and the impossibility of reaching the seed by intersection. Part IV, Tiger Leap, takes up the two tigers of #1642, the book's leap into the future from Tiger Leap (#1636) and the jump map J of Transition in Entropic Systems (#1630), and joins them: the seed's leap forward is completed by the later field's jump. It gives release as declassify, reopen, reclassify, the inversion of genus and species, and the ratio of release pressure to escape cost. Part V compresses the magnitude vector and its bounds; Part VI canonization as change of status with content intact, the separation of priority, adequacy and descent, recollection from #1659, and the specimen session. The canonical line ends on the record knowing the date. Whether the checksum decodes without the archive is left open, as in the series.