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@ -4193,16 +4193,16 @@ import "@openzeppelin/contracts/utils/cryptography/MerkleProof.sol";
These functions deal with verification of Merkle Tree proofs.
The proofs can be generated using the JavaScript library
https://github.com/miguelmota/merkletreejs[merkletreejs].
Note: the hashing algorithm should be keccak256 and pair sorting should be enabled.
See `test/utils/cryptography/MerkleProof.test.js` for some examples.
The tree and the proofs can be generated using our
https://github.com/OpenZeppelin/merkle-tree[JavaScript library].
You will find a quickstart guide in the readme.
WARNING: You should avoid using leaf values that are 64 bytes long prior to
hashing, or use a hash function other than keccak256 for hashing leaves.
This is because the concatenation of a sorted pair of internal nodes in
the merkle tree could be reinterpreted as a leaf value.
OpenZeppelin's JavaScript library generates merkle trees that are safe
against this attack out of the box.
[.contract-index]