For blockchain to be useful, your use-case has to: 1) Involve coordination between parties who don't trust each other; if they trust each other, a regular data

For blockchain to be useful, your use-case has to: 1) Involve coordination between parties who don't trust each other; if they trust each other, a regular database will do fine and be much more efficient. 2) Exist completely within the ledger; once something is in the ledger it's tamper-proof, but bad information can still enter the ledger from the outside world. This is the reason it doesn't serve much purpose for anything physical, like delivery confirmation. If someone wanted to fake a delivery they could just... enter fake information. That makes for a very narrow set of legitimate use-cases, most of which are crypto-currency, whose status as a "solution to a problem" is dubious at best.