The Loci Method?

It's a well respected way of storing information. But (drawing a terrible analogy) it's a linked list, not a hash.

It's hard to perform a random lookup on something 2/3rds of the way through your mental tour.

SRS works on the well understood phenomena of repeated exposure and tested recall. They're very good at imprinting atomic information even if that information has no context whatsoever. The original research was done with randomly chosen letters.