[FIG(quote)[
[FIGCAPTION[
[1] [CITE@en[Key Uri Format · google/google-authenticator Wiki]]
([TIME[2017-10-01 23:26:38 +09:00]])
<https://github.com/google/google-authenticator/wiki/Key-Uri-Format>
]FIGCAPTION]

> Secret keys may be encoded in QR codes as a URI with the following format:
> otpauth://TYPE/LABEL?PARAMETERS

]FIG]


[2] [CITE[history - Who invented the otpauth:// URI scheme? - Software Engineering Stack Exchange]]
([TIME[2017-10-01 23:28:44 +09:00]])
<https://softwareengineering.stackexchange.com/questions/210597/who-invented-the-otpauth-uri-scheme>

[3] [CITE[Authen::OATH::KeyURI - search.cpan.org]]
([TIME[2017-10-01 23:29:10 +09:00]])
<http://search.cpan.org/dist/Authen-OATH-KeyURI/lib/Authen/OATH/KeyURI.pm>

[4] [CITE@en[Feature request: Add otpauth as a safelisted scheme for protocol registration handling · Issue #2204 · whatwg/html]]
([TIME[2017-10-01 23:29:38 +09:00]])
<https://github.com/whatwg/html/issues/2204>

[5] [CITE@en[Add otpauth as a safelisted scheme for protocol registration handling by JakeChampion · Pull Request #2205 · whatwg/html]]
([TIME[2017-10-01 23:30:00 +09:00]])
<https://github.com/whatwg/html/pull/2205>