I have thought for a long time about what it would be like in prison. I have had nightmares ever since I started hosting onion sites. I'm glad to be out of that game but it could still catch me so I still worry. My greatest fear I know is shared by many: the stupidity of jurors in assessing a highly technical case, and also envious parasite co-prisoners, if the worst happens.
I have decided to make brainwallets for Bitcoin and many of them, which I can give away as a sort of prison version of Bitcoin. If I double spend and scam I would just get my legs broken by my co-prisoners. What is a brainwallet? It is where a cryptocurrency address (public keys) and authority to spend whats in that wallet (private key) is derived from a passphrase.
With such a facility I should at least be able to get stoned, if something terrible is to occur.