What about bip32 derived keys? One master key to hold them all, just got to remember the assigned index numbers for your various keys.

Otherwise, backing up many keys becomes a hassle the more keys one has.

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It's not a hassle. My password manager holds over 1000s different passwords for me. They don't need to be linked at all.

Bip32 is just a password manager. A good improvement, but a minor one.

i think so long.