Certora: prove balanceOf(account) ≤ totalSupply - #952
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Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GqgC73NYp8CXpRjornVLnj
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GqgC73NYp8CXpRjornVLnj
MathisGD
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Jul 24, 2026
QGarchery
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Jul 28, 2026
Co-authored-by: Quentin Garchery <garchery.quentin@gmail.com> Signed-off-by: MathisGD <74971347+MathisGD@users.noreply.github.com>
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Requested by Mathis GD · Slack thread
Proves that every account's
balanceOfis bounded bytotalSupply, addressing the "prove balances is less than totalSupply, potentially using ghostmappingsums" item of the Certora wish list (#137).In
Invariants.spec, thetotalSupplyIsSumOfBalancesinvariant now sums balances with CVL's nativeusum(totalSupply == usum(balances)), replacing the previous manualmathintaccumulator. A newbalanceOfLeqTotalSupplyrule derivesbalanceOf(account) <= totalSupply()from it —usumguarantees the sum is at least any single balance.