Healthcare use of Blockchain on FHIR

I went to the ONC Interop Forum in DC. The security track focused on blockchain all morning. There was nothing new mentioned. This not to say that the audience didn't get any value, just that I didn't hear anything new. This lack of new insight is itself an important point. It indicates that much of the interest in Blockchain is very niche, that any efforts have not yet found the 'killer app'. This is also not an indication that no...