Logging into services online is a mess; different usernames and passwords at different sites, different standards of trust and security. But it's just as bad in the financial world.
For many financial transactions a signature is sufficient. For some, you have to have the signature notarized. The notary's job is to verify your ID, maybe take a thumbprint, and take $10 from you. Somehow this adds security. I learned today there's a different kind of signature authentication, the Medallion Signature Guarantee. It's commonly used to authorize stock transactions. Banks charge $10; crazily enough they're apparently assuming liability for your authentication.