This is an example of "Charon's obol", a coin placed in the mouth of the dead, intended as ferryman fare to cross the river Styx... Did you know an early motivation for digital money was as a means for Extropian transhumanists to pay for their cryopreservation? A "brain wallet", like the coins in the mouth of dead Romans, would be motivation for future scientists to resurrect you with "brain intact." Source: "Digital Cash" by Finn Brunton... see my review here: View quoted note → Image source

Charon's obol - Wikipedia