There seems to be an argument amongst YouTube users about the account named Curmodgeon. Some people claim that the account holder is the savior of Nirvana's legacy and could possibly be Krist Novoselic or a reincarnated Kurt Cobain. Others claim he's a member of a highly private Nirvana bootleg group, who has broken an oath to not leak material to the public.
The mud slinging in the comments sections are an entertaining read while listening to the ridiculously rare footage provided by Curmodgeon. My favorites include Ted Ed Fred live at the Community World Theater in 1988, the 24 minute home shot tour footage from 1990, live footage of Rignall Hall in Olympia from 1990, and the complete O.K. Hotel show from 1991. Oh man, there's mountains more. Sift through it here.