I'm sorry, but that is just a blatant misunderstanding of how economics work. It wouldn't combat blatant consumerism, it would literally destroy the economy. Not to be replaced by something better, but just destroy it. There would be no reason to invest in literally anything, including people, no reason to repair your house or feed the poor, because the money it would cost, would be worth more tomorrow.
Why would I buy a car, or bike, or proper nutritional food, if I could save that money for tomorrow, and buy more? Only tomorrow it's the same thing, so I'll live like shit until the next day, then the next day, and then the next....
The only people who would have any quality of life, would be the rich cunts. They'd live like the do now, because they don't actually need more money.
Deflation is never a good thing, I'm saying this as a socialist.
How would secret transactions make a the coin not deflate? The issue is control of the production of the currency. If you can't control it, it's a cointoss wether it'll be infaltionary or deflationary. A lot of inflation is bad, and any deflation is catastrophic, so I'd really rather not leave the economy up to random chance and private entities' willingness to control the production of their shitcoins.