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Bug :: Multiple valid keys in merkle tree #1

@karlfloersch

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@karlfloersch

https://github.com/ben-chain/ovm-contracts/blob/master/contracts/optimistic-ethereum/libraries/trie/Lib_MerkleTrie.sol#L153 -- here we may not have enough information in the merkle proof to recover that a key is in fact a leaf node vs being a node higher up in the tree. This also may not be a problem and I just don't know where this check is made 😄

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