A quantum computer running Shor's algorithm could theoretically recover an incoming viewing key from a publicly exposed Zcash address to link an account's wider payment history.

Whether quantum computers could break the cryptography securing Bitcoin and other blockchains, and how networks plan to migrate before that day.

Cryptocurrencies engineered to hide senders, receivers or amounts, led by Monero and Zcash, and the exchange delistings and bans they face.