Smart contracts are perhaps the most oversold part of the whole block chain concept. What works for digital products (service contracts, financial transactions

Smart contracts are perhaps the most oversold part of the whole block chain concept. What works for digital products (service contracts, financial transactions, data delivery) cannot always be mapped to the physical world. There are some interesting concepts that deal with trust and verifiability of data entry, scanning, and sensors, though. They just don't have anything to do with smart contracts or block chain per se, though they borrow some high-level ideas from it. But this an area where block chain in general has no place and other mechanisms (simple rule-based plausibility checking, automated anomaly-detection, etc.) are much more helpful. The physical world requires different approaches.