My first thought was that it had been signed by one of the artists who performed on the soundtrack (specifically Garbage, who contributed one track for both GT1 and GT2), but that didn't correspond to anything I saw online via cursory search.
If I had to guess, it's members of the dev team -- maybe the director, Kazunori Yamauchi?
Good suggestions I'll see if I can find anything that matches closely to what I see on the cover
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