Definition
Passkeys use FIDO authentication standards and bind a credential to a particular relying party, such as a website. The service stores public verification information, while the private credential is protected by an authenticator. Passkeys may be device-bound or securely synchronized through a supporting provider. They are not the same as a cryptocurrency private key or wallet recovery phrase.
How It Works
At sign-in, the service issues a challenge and the authenticator produces a valid response after the required user interaction. Local verification may use a device PIN or biometrics; the fingerprint itself is not simply sent as the account password. Binding to the legitimate service helps resist imitation websites that try to collect reusable credentials. The exact behavior depends on platform and service support.
Key Considerations
Protect the device and any account used to synchronize or recover passkeys. Review fallback login methods because a weak recovery route can undermine an otherwise strong setup. Losing one device may or may not remove access, depending on backup arrangements. Passkeys reduce several password-related attacks but do not prevent all account fraud or compromised-session abuse. On a crypto website they authenticate supported actions; they should not be assumed to replace on-chain signing unless the wallet explicitly implements that design.