[lewi]

  If two devices create valid transactions on two independent subtangles and the system tries to reconcile these tangles into the main tangle afterwards, how do they determine which transaction is valid?

The subtangle with the highest weight.

  when you start thinking about possible applications it's actually quite hard to come up with something that seems both interesting and doable.

I can think of a number of niche examples that would benefit from both data security and a value settlement layer

  no one seems to think about the privacy implications of having IoT data

This is constantly being thought about. GDPR compliance is quite a tricky one, then you have Japan which even classifies the hash of personal data controlled. This doesn't mean its being left behind.

[phire]

> The subtangle with the highest weight.

Which is not an acceptable answer, at least from the perspective of an offline node accepting payment. People will exploit it by paying an offline vendor, taking the goods then rushing online to create a doublespend which reverts the transaction.

So offline vendors will never accept it as payment, and the entire feature is useless.

[CyberDildonics]

IOTA seems filled to brim with red flags to me, but where does the expectation come from that you can use electronic money offline?

You can't do it with credit cards, people will generate fake numbers.

You can't do it with bitcoin, someone can double spend with a higher fee.

[lojack]

Who said anything about offline nodes accepting payments? I wouldn’t expect transactions to even be remotely possible offline.

[ThePhysicist]

In my understanding, the ability to make transactions on a sub-tangle while not connected to the main network is sold as one of the main advantages by the IOTA creators.