Deterministic JavaScript execution.
Run JavaScript that replays byte-for-byte, forks a live heap, and proves exactly what it did. One runtime — replayable, forkable, provable.
replayable — same in, same out, forever
forkable — branch a warm heap N ways
provable — a signed receipt per run
Built for AI agents that write & run code · eval platforms scoring customer functions · products running customer formulas, plugins & untrusted JS
2026 is the year running other people's code got dangerous.
axios → RAT
@antv → CI/CD theft
Cline → token exfil
Vercel → env leak
Red Hat npm → backdoored
Every one lands through a step the box doesn't have — an install, a lifecycle script, an ambient socket, a plaintext secret. No surface here.