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COMPETITION between currencies is the stuff libertarian dreams are made on—and central bankers’ nightmares too. Already digital monies, in particular Bitcoin and Ethereum, are rivals. On October 28th a new crypto-currency will join the fray: Zcash. Many such “altcoins” are dubious affairs and don’t add much. But this one brings important innovations.

Zcash is based on Bitcoin’s code, but its creators, a bunch of cryptography researchers, have tweaked it. The new digital cash is minted more quickly and the system can handle more transactions. This makes for more liquidity and shorter transaction times, says Zooko Wilcox, who leads the project.