I’ve heard of a couple interesting applications (interesting doesn’t necessarily mean good)

1. I’ve been out of the industry for a couple years, but at the time I left both the US’s NAR and CA’s CREA were looking to create blockchains that would eventually hold an immutable history of every salable property in North America. The sales pitch is that no one will ever be able to hide things like flood damage or zoning changes if they’re all those events are in a trusted database.

2. Several US states with legalized Marijuana have what are known as Seed To Sale laws. One company was trying to move into this space and eventually into all of agriculture. The idea being that if you buy pot scanning a QR code would tell you what clone# the seeds were from, where and when it was planted, what pesticides/herbicides were used on/near it, when it was harvested, any tests it had gone through, etc.