Consider that Walmart ran its own 'miner' service. There seems to be no gain as a 'shard' or set of buyers pricing in bitcoin. All the destination addresses are Walmart, the sources scatter everywhere.
What gain is there to Walmart, it still has to submit a huge bunch of scattered addresses to block chain, pay fees. Walmart needs some gain to collation, a way to delay the call to blockchain and let senders run up their bitcoin tab a bit, credit, really.
This is where prequals work, like signing up for a Walmart bitcoin card by prequalifying. Our bitcoin address is open for viewing of the prior history. Walmart requires a certain reserve left on the block chain for 'purchase in advance', then Walmart can delay the call to block chain, allow you to run yuo the tab for gains in ledger efficiency.
And Walmart can contract with a third party to aggregate address spending across similarly designed credits systems. All parties bear a priceable scofflaw risk. We get a correspondent 'miner' system, like fiat, but tailored to retail at one level. Another like credit system with prequals for bitcoin can handle wholesale.
The contract for bitcoin is nearly the same as a standard card. Walmart (and partners) allow you purchases up to 1.15 times your bitcoin account on record. Then add an absolute limit. Just like a credit card.
Walmart is not your first market, resort towns are. large international resorts can run the local bitcoin shard, the travel agencies another. Collation is a gain as the traveler starts and ends with a series of bitcoin pricings. Frequent travelers carry the Bitcoin Travel Card.
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