According to Google's latest algorithm, Bitcoin really needs an upgrade When a Bitcoin transaction is broadcast, the public key is briefly exposed. A quantum computer could derive the private key and steal the funds in about 9 minutes—while Bitcoin transaction confirmation takes around 10 minutes, with a success probability of nearly 41%. Plus, after the Taproot upgrade, around 6.9 million BTC are now sitting in these 'public key visible' addresses, including the coins mined by Satoshi back in the day