If it's digital, it's traceable. If it passes through DARPA wires, or FCC waves, it's traceable. There are ways to obfuscate. But never completely like an 'air-

If it's digital, it's traceable. If it passes through DARPA wires, or FCC waves, it's traceable. There are ways to obfuscate. But never completely like an 'air-gapped', transaction wherein I hand a cashier $5 in exchange for ice cream. I'm clearly in the 'it's nobody's business except for the parties involved' party...