Some people don't upload crafts to the website because they're scared of thieves. I think this community is not that toxic and we already have the link to the original craft if someone modifies an existing design.
But to make it even more robust why don just add a section in the xml code with the name of all the players that worked on the craft? Any time a new player works on that design his/her name is added to the list. I don't think lists are going to have more than 3 names and that may help to track the original maker if sometimes any drama happens.
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