I use the Linkchecker module on my website but the database stores my urls as a urlhash. I’m not familiar with this kind of security, so is there anyway I can revert these strings back to the original url?
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Hashing is a one-way process, designed to create signatures or fingerprints that are easily comparable by a machine.
Reverting hashes to their original strings is almost impossible (depending on the hashing algorithm) and involves reverse engineering and number crunching.
So, to answer your question in short: no this is not possible.
see a similar discussion on md5