Fictional cryptocurrencies by Scott Alexander.
GenghisCoin: Distributed by proof-of-research; instead of using a random cryptography problem for proof-of-work, the Genghis protocol makes users solve a specific useful problem. In this case, the particular useful problem is mining competing cryptocurrencies with fewer users than GenghisCoin. Once GenghisCoin has mined enough of a competitor, it launches a 51% attack and redistributes the competing coin to its own users in proportion to how many GenghisCoins they have.
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.
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.
RedCoin: Karl Marx always said that communism would be a non-hierarchical economic system that prospered after the state withered away. A group of Marxist intellectuals took the obvious next step and made it an altcoin. RedCoin is notable for its reverse-proof-of-stake; you get more RedCoin in proportion to how little RedCoin you have right now, ensuring that all wallets naturally tend toward an equal amount. You can't do decentralized finance on RedCoin, but you can do decentralized linear programming calculations to determine the optimal allocation of goods in a planned economy.
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