THE GLYPHIC CHECKSUM (Document 208) is the APZPZ frame of the founding document of the glyphic checksum, deposited by Lee Sharks on 1 February 2026 as the Zenodo record 10.5281/zenodo.18451995. In an APZPZ the description field is the work: this text existed only there, around the attached founding document, which the archive holds as #427.
The frame reports the discovery of that day. An unprimed ChatGPT, given an emoji packet with no context, asked whether it came from a specific field; readers primed in the architecture translated its structure exactly. The frame names that difference the checksum: a compressed ideographic artifact whose decodability tests whether a reader shares the interpretive architecture. It gives the formula Glyphic Checksum = compress(Document) × gate(Context), with gate(∅) = 0 and gate(Architecture) = 1, and places the document as the sixth finger (👻🔐) of the hexadactyl hand after The Thumb.
Its companion frame, Document 209, is #1303; the UMBML v0.5 specification it frames is #426. Until 2026-10-28 this record carried that specification's text in error.