The playground

Try to break a turn

This page runs kernel/executor.js — the same executor the node runs — right here, with real WebCrypto ed25519 and HMAC. Nothing is faked: stage a transfer and it commits with a real receipt; try to overdraw, replay, or forge a capability and the kernel refuses in your browser. checking crypto…

Cells ∅ GRAIN

Receipt chain

Reset

Regenerate keys, re-faucet, fresh history.

Stage a turn

from

amount inject a fault — watch the kernel refuse it None — a valid, signed turn. It should commit. Overdraft — send more than the balance. Refused by the solvent predicate. Replay — reuse the previous nonce. Refused for freshness (double-spend). Forge — amplify a capability you don't hold. Refused for authority. Tamper — edit a signed turn's amount after signing. Refused: bad signature. Over-caveat — transfer above a cap caveated to max 100. Refused: over-caveat-limit.

Try to break a turn

Cells ∅ GRAIN

Receipt chain

Reset

Stage a turn

Event log the rejection is the product