An AI can build a table, a drawing, or a 3D model in front of you — one step at a time, so you can replay exactly how it got there.
A capsule drives a shared organ (table · canvas · 3D viewport) through one flat integer op-stream. The organ folds it into state, so the surface re-renders bit-identically at every step, replays deterministically, and its snapshot can’t lie — re-fold and digest, on your device.
Integrity (anyone, offline, no trust): Verify re-folds the op-stream in your browser and re-derives the digest + commitment — tamper the state and it goes red. Attribution (which capsule produced it) is trustworthy only when the artifact is signed by the platform; an unsigned or shared artifact shows its producer as self-declared, not verified.