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+* ``android.intent.action.VIEW`` with URIs following the ``openpgp4fpr`` (OpenPGP version 4 fingerprint) schema.
+* For example: ``openpgp4fpr:73EE2314F65FA92EC2390D3A718C070100012282``.
+* Compatible with Monkeysphere's and Guardian Project's QR Codes
+* Only full fingerprints are supported, not key IDs. After scanning OpenKeychain allows for certification of keys and this is only secure with full fingerprints.
+
+
+## About `openpgp4fpr` (copied from https://github.com/effigies/openpgp4info)
+
+In 2010, the [Monkeysphere](http://web.monkeysphere.info/) project
+[introduced](http://permalink.gmane.org/gmane.comp.security.monkeysphere/592)
+the `openpgp4fpr:<FINGERPRINT>` scheme for sharing OpenPGP key fingerprints,
+where `<FINGERPRINT>` is the full 40 hex character fingerprint of a primary
+key, and has since been adopted in vCards for sharing public keys.
+
+Perhaps more significantly, several Android applications ([APG](
+https://play.google.com/store/apps/details?id=org.thialfihar.android.apg
+)/[OpenKeychain](
+https://play.google.com/store/apps/details?id=org.sufficientlysecure.keychain),
+and the Guardian Project's [GnuPG port](
+https://play.google.com/store/apps/details?id=info.guardianproject.gpg)) now
+accept this scheme as a means of quickly exchanging public keys via QR codes.
+The Android "intents" interface paves the way for `openpgp4fpr` URIs to become
+increasingly common. The purpose of the site was to provide a proof-of-concept
+that demonstrates their applicability outside the realm of Android applications.
+
+In early 2015, the [WHATWG](https://html.spec.whatwg.org/multipage/
+"If you're wondering what cipher to enable: rsa_rc4_128_sha.") [accepted](
+https://html5.org/r/8872) `openpgp4fpr:` as a [whitelisted scheme](
+https://html.spec.whatwg.org/multipage/webappapis.html#whitelisted-scheme).
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