Behavioral Delta Ledger
An opt-in practice view that reports whether an edit changed your program's behavior on hidden checks built from an exercise's own tests — counts only, never a grade, never part of review or certificates.
The Ledger checks whether an edit changed your program's behavior on a set of hidden checks built from this exercise's own tests. It reports counts only — never which check, never whether a change is right.
It is practice only and never a grade. It never changes your saved progress, review schedule, streaks, or certificates.
It never shows which hidden check changed.
The Ledger stores one signature per problem in this browser. Nothing is synced. You can clear it at any time.
The hidden checks are a sample; an edit can still matter without changing them.
Problems you have attempted
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Your bugs
Sources you explicitly saved from a Ledger workspace. Up to 3 per problem, 4 KB each, 48 in total — stored in this browser only, newest kept when a cap is reached.
Nothing saved yet. Open an attempted problem and use “Save this source to Your bugs”.
No signatures stored on this device.