Local signatures using WebCrypto++

F.Y.I.
The following demo application shows another take on local signatures:
https://mobilepki.org/WCPPSignatureDemo

The core concept also supports "untrusted" requesters like merchants:
https://mobilepki.org/WebCryptoPlusPlus

WebCrypto++ (if ever realized) requires massive changes in the underpinning
client platforms, but it is fairly easy writing code for such applications :-|

Anyway, Microsoft has also put out a proposal in this space
https://www.w3.org/2012/webcrypto/wiki/images/d/dd/CertAndKey_Management_Requirements_for_WebCrypto_microsoft.pdf
so it seems that local signatures are getting more attention that before.

Cheers,
Anders Rungren