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Why are these 2 smart contracts, which differ only in the comments, result in different bytecode:
1st
pragma solidity 0.4.20;
contract Test {
// test
function test() pure public {
}
}
2nd
pragma solidity 0.4.20;
contract Test {
// test2
function test() pure public {
}
}
The Solidity compiler appends the metadata file hash at the end of the bytecode http://solidity.readthedocs.io/en/develop/metadata.html
Metadata file is a json file that contains hashes of source files so changing comments changes the metadata file hash.