Blockchain feels like the right answer to the problem, but it's just infeasible in practice. Who do you trust to handle the blockchain for the entire world? Hav

Blockchain feels like the right answer to the problem, but it's just infeasible in practice. Who do you trust to handle the blockchain for the entire world? Having a chain that maps the entire global trade will quickly grow to unwieldy proportions - if you need a data center to even store the petabytes of the chain's data, the entire point is moot: You'd again have to trust large vendors. If you instead opted to have smaller chains, perhaps on the goods category, country, or even reseller level, the market would fragment. We'd soon end up with multiple chains claiming different things, rendering the whole endeavour obsolete again. And we didn't even talk about meatspace issues yet: Things disappear, get stolen, lost, destroyed, dissolve, companies change ownership, move to other locations, bribe, steal, commit fraud, get banned from selling things somewhere... it's a huge mess! Now sure, all of that isn't directly related to a supply chain. But on a global scale, a supply chain is always just an incredibly limited view of a network of goods moving from A to B. To prevent reality in the blockchain drifting apart, you'd need a way to model all of this. In the meantime, I'd much rather see simpler solutions: Nobody seems to have tried printing QR codes on physical products that contain PrivKey-signed manufacturing information, for example.