The Thousand Dollar Sharpie: Signature as Compressed Portraiture on U.S. Currency

EA-TDS-01 — CENTER PANEL of The Thousand Dollar Sharpie triptych On March 26, 2026, the U.S. Treasury announced that President Trump's signature would appear on all future paper currency — the first sitting president's signature in 165 years. This deposit argues the signature functions as compressed portraiture: a personal identity claim performing the semiotic work of a portrait through a different medium, exploiting the narrowing of the 1866 Thayer Amendment from 'portrait or likeness' to 'portrait' alone (31 U.S.C. § 5114(b)). Analyzes CC BY-SA as anti-enclosure architecture. Establishes the Sharpie as dual-state semantic object (σ_SH). Maps the scholarly void at the intersection of monetary economics,…