> If you're buying diamonds or bananas or cobalt, and you need a provable supply chain though.. yeah.. it fits. I've heard about this supposed use for blockcha

> If you're buying diamonds or bananas or cobalt, and you need a provable supply chain though.. yeah.. it fits. I've heard about this supposed use for blockchain before and I genuinely don't get it. So what if you have a tamper-proof blockchain containing information about a supply chain? How does this prove anything about the particular diamond you're selling me? Again, this is a genuine question. Can someone please walk me through this? What information do I need to verify about the supply chain and how does blockchain help? How were people solving this problem before blockchain?