I don't think this is a practical issue, really. I assume linking to the original answer is sufficient attribution. In the link you can find name, license and

I don't think this is a practical issue, really. I assume linking to the original answer is sufficient attribution. In the link you can find name, license and figure out if the answer was modified. Also linking the answer in a source comment is the smallest professional courtesy everyone should be doing. If you have some issue of not linking an answer then you likely do not deserve the answer in the first place.