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What's the difference?

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All stages · Demo 444

Canadian BN

Choice ca / vat / other. Nine digits, Luhn. Jev never doubles. Eight digits need 9. Distinct from SIN and EIN.

ChoiceBN Luhn in JS

A digit tape. 123456782 books a CRA plate. A last-digit flip rejects. Eight digits never pass.

replaykind —bn —

STANDBY

All 4056 stages

Educational stage on jev.page — not the official TypeSafe console. Live calls go to POST https://api.typesafe.ai/v1/systemone from your browser when you paste a key. Without a key, the stage plays a recorded decision shaped like jev-1.13.0. Jev does not write the UI copy.