Apparently the Link to the Past randomizer (which is a fun challenge if you loved LttP and played it to death and back) relies on a specific version of the rom to create its runs. Specifically the Japanese 1.0 version with a md5 of 03a63945398191337e896e5771f77173 .
I can't find the damned thing, aid would be appreciated, and you can bet I'm going to repost the forsaken thing everywhere when I find it.
OP replying himself here. Using the CRC32 of 3322effc was much more effective than the MD5.
Give the randomizer a whirl if you're an old Nintendork like me.