Message signing with CryptoCurrency wallets (especially those that integrate with the browser like web3.js compatible ones e.g. Metamask), might be a good avenu

Message signing with CryptoCurrency wallets (especially those that integrate with the browser like web3.js compatible ones e.g. Metamask), might be a good avenue in the future, as these tools may become widespread for other reasons, yet also fix web authentication in the process. Users would find the process of moving their identity on different devices tedious, but if that allows them to synchronize their whole digital lives, it would seem worth the effort.