Yes, pleas. But actually hash-chain is useful tool, eg. git. Difference is: it is some gear inside something doing something and not something on their own. A

Yes, pleas. But actually hash-chain is useful tool, eg. git. Difference is: it is some gear inside something doing something and not something on their own. Accounting was using "column sums" on every document page for centuries and "block-chain" is exactly that, just for less structured data. As for Maersk-IBM "international system" - maybe they should try something domestic first, like military storage/purchase tracing ;)