NDC Oslo 2019 Root-Of-Trust talk

I'll be giving a lightning talk on the concept of Root-Of-Trust at NDC { Oslo } in June.

I want to cover : the RoT-concept | the various types of RoTs (one example being the TPM chip found in modern computers) | how RoT's can be used | Typical implementations mistakes that can happen from the developer side | why you need a RoT if you are deploying devices in IoT

...but I only get 15 minutes. We could talk for 2 hours on this.

So: what should I make sure not to leave out? Let me know!