Day 5: Forgery Cost — The Math Behind CPS-0001

[RaymondHWu]

Why we stopped looking for unfakeable signals and started measuring forgery cost instead.

The conventional approach assumes a static technological advantage. We think that's a losing strategy. Instead, CPS-0001 uses cost asymmetry: making forgery exponentially more expensive as you add evidence channels.

Single frame: 1× → + Temporal: 5× → + Cross-modal: 25× → + Live challenge: 100×

Four engines, same protocol:

• EE-001 (PES): Cohen's d = 2.1
• EE-002 (Cross-modal): 100% temporal alignment
• EE-003 (Challenge-response): 60% pass rate
• VS-001 (Pipeline): 93% pass rate

Each adds a cost multiplier. Together they change the economics of forgery.

Open protocol (Apache 2.0): github.com/myshapeprotocol/myshape-protocol