Bloom is a liar that never forgets. It says "maybe" or "no". Never "yes" wrong.
1 bit per user. 10,000 users = 1.2KB. At Mutiny that fit on a floppy.
core_bit = 1 // "I've seen this lineage"
I stole the idea from a phone book. You don't need the name, just "is this number in Dallas?"
Our PNG nest uses that one bit as the bloom. If it's 0, it's virgin. If it's 1, it's been through the machine.