I saw you mention it - but are they still doing that in any material way? All the stuff I could find on that was back from the “Peak Blockchain” era of everyone trying it out so as not to be left behind. Plenty of blockchain enthusiasts pointing to WMT, but nothing in the last few years to indicate they’ve given it any real effort.
The blockchain is useful for tokens and alt-currencies. No doubt. But almost all the other uses - the ones that were going to fundamentally change the world - ended up being abandoned as most companies wound down their pilot programs.