WhoAmI?
may be auditor
Block: 39
Author: Anonymous
AuditProfile
Security blog
Challege is ERC721
#mapping
#memory
Hint
It's kind of a logic bug. Try to think of what is missing in this function.
Answer
Notice the mappings at the beginning? Why do you think they were specified? Yes, their values are not updated during transfer. This means that a user can make a transaction several times for one id and empty the contract.
CTF
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Useful tools
EVM diff
Compare execution layer differences between chains
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Dive deep into the storage of any contract
