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OUSD Fuzzing Campaign

Invariants

  • Transfer
    • The receiving account's balance after a transfer must not increase by less than the amount transferred
    • The receiving account's balance after a transfer must not increase by more than the amount transferred
    • The sending account's balance after a transfer must not decrease by less than the amount transferred
    • The sending account's balance after a transfer must not decrease by more than the amount transferred
    • The receiving account's balance after a transfer must not increase by less than the amount transferred (minus rounding error)
    • The sending account's balance after a transfer must not decrease by less than the amount transferred (minus rounding error)
    • An account should always be able to successfully transfer an amount within its balance.
    • An account should never be able to successfully transfer an amount greater than their balance.
    • A transfer to the same account should not change that account's balance
    • Transfers to the zero account revert
  • Supply
    • After a changeSupply, the total supply should exactly match the target total supply. (This is needed to ensure successive rebases are correct).
    • The total supply must not be less than the sum of account balances. (The difference will go into future rebases)
    • Non-rebasing supply should not be larger than total supply
    • Global rebasingCreditsPerToken should never increase
    • The rebasing credits per token ratio must greater than zero
    • The sum of all non-rebasing balances should not be larger than non-rebasing supply
    • An accounts credits / credits per token should not be larger it's balance
  • Accounting
    • After opting in, balance should not increase. (Ok to lose rounding funds doing this)
    • Account balance should remain the same after opting in minus rounding error
    • After opting out, balance should remain the same
    • After opting in, total supply should remain the same
    • After opting out, total supply should remain the same
    • Account balance should remain the same when a smart contract auto converts
    • The balanceOf function should never revert
  • Mint & Burn
    • Minting 0 tokens should not affect account balance
    • Burning 0 tokens should not affect account balance
    • Minting tokens must increase the account balance by at least amount
    • Burning tokens must decrease the account balance by at least amount
    • Minting tokens should not increase the account balance by less than rounding error above amount
    • A burn of an account balance must result in a zero balance
    • You should always be able to burn an account's balance
  • Approvals
    • Performing transferFrom with an amount inside the allowance should not revert
    • Performing transferFrom with an amount outside the allowance should revert
    • Approving an amount should update the allowance and overwrite any previous allowance
    • Increasing the allowance should raise it by the amount provided
    • Decreasing the allowance should lower it by the amount provided