"I'm sitting here wondering the number of brains where a vague memory of me resides, slowly eroding into forgetfulness."

Great post, meno!

Maybe great minds think alike, cos you sound like Stanford psychiatrist and writer, Irvin Yalom, who said:-

"Some day soon, perhaps in forty years, there will be no one alive who has ever known me. That's when I will be truly dead - when I exist in no one's memory. I thought a lot about how someone very old is the last living individual to have known some person or cluster of people. When that person dies, the whole cluster dies,too, vanishes from the living memory. I wonder who that person will be for me. Whose death will make me truly dead?"

And I was thinking that if Irvin Yalom can write words like that, how can he be forgotten?

And if you write words, like this post on a Blockchain, how can you be forgotten?

It is what it is. :)