WhoAmI?
may be auditor
Block: 41
Author: Anonymous
AuditProfile
Security blog
Return dust
#opcode
Hint
Again, you should know how opcodes work...
Answer
selfbalance() equals address(this).balance. In other words, in this case a user will be able to return not only his balance after transfers (they call it dust), but also the whole balance of the contract!
CTF
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Useful tools
EVM diff
Compare execution layer differences between chains
EVM storage
Dive deep into the storage of any contract
