Feb 12, 2021
VatiCoin: After a thousand years, the Catholic Church discovered how to do indulgences right: as tradable digital tokens. Not only does an initial coin offering provide better price discovery than the Pope picking a random number, but sinners who do good deeds later can sell their coins to someone else. Subject of several court cases about whether someone's VatiCoins go to their heirs upon their deaths or whether this would defeat the point; current holders are advised to avoid the problem by not disclosing the password to their wallet.
Banned because: Frequently used as a hedge against other cryptocurrencies involved in crime and pornography.
Driverify: Developed by Tesla's self-driving-car division. Cars mine Driverify with spare computing power while idling, and spend it bidding against each other for right-of-way if they arrive at a four-way stop sign at the same time (users can preprogram how aggressively their cars bid in these auctions). Compatible Teslas would also have fenders that send electrical pulses, transmitting data into the receiver fender of another car. If two Teslas got in a fender-bender, they could use their now-connected fenders to have the at-fault car recompense the victim by transferring an appropriate amount of Driverify.