Deriving per-domain key pairs from a single master secret is what SQRL did, makes perfect sense for most use cases, allows for straightforward paper backup and

Deriving per-domain key pairs from a single master secret is what SQRL did, makes perfect sense for most use cases, allows for straightforward paper backup and transport between devices. https://www.grc.com/sqrl/sqrl.htm https://www.grc.com/sqrl/sqrl.htm