yondonfu
commented
6 years ago - During Merkle tree construction, each pair of child hashes is sorted and then the concatenation of the sorted child hashes is hashed to get the parent hash. This is expected by the Solidity MerkleProof library: https://github.com/OpenZeppelin/zeppelin-solidity/blob/master/contracts/MerkleProof.sol#L23
- In general, a Merkle proof is an array of 32 byte hashes, but for the purposes of submitting to the MerkleMine contract, the expected format is a single byte array with each 32 byte hash concatenated together
- Add link to good resource on Merkle tree construction