Thank god Sonos came out back in 2005 (or so) and was built without all of this nonsense - no doubt if it was released today there would be a mySonos web login account cloud identity blah blah blah...
Some day I want to see more systems with a decentralized architecture, where cloud servers, if used at all, only help facilitate a secure VPN connection between the user's device (e.g. a phone) and the user's home network.
It does look like you're addressing the right problems with "Signpost" and "Irminsule". Am currently reading your slides.
To put it into perspective, NoScript is the 4th most popular add-on to firefox.
https://addons.mozilla.org/en-US/firefox/extensions/?sort=us...
Software like what you are developing needs to be designed with a strong security mindset from the beginning. It is a truism in the industry that security tacked on after the fact never works very well. I was extrapolating from the security naivete of your website design to the likely naivete of your software design.
Regarding your final para, please be assured that the folks working on the software are 'best-in-class' and do have a strong security mindset as well as a deep background in internet systems. The software is the output of research work being done in the University of Cambridge and I made the site to try and showcase the work and provide more context around it. The front-end of the site may be lacking but that shouldn't reflect on the software we're making (though I do understand why people extrapolate).
Anyone who buys this system and makes it central to their home's operation (as intended) becomes exceptionally vulnerable to the decisions of the people who control the servers. Even if the developers' interests always align with my interests, I'm still vulnerable if their system gets hacked, if they go bankrupt (and shut down) or if they are acquired by a company with a different management perspective.
It would be like buying a car that has to check in with Lexus every time I want to start the engine.
Isn't that called OnStar?
Edit: Drilling down to the ninja blocks pages I see mention of a "ninja cloud account" as being required to install drivers. That sort of unnecessary external dependency is a deal-breaker for me, essentially negating the entire value proposition of open-source.
http://ninjablocks.com/blogs/how-to/9555237-installing-drive...