What we need is sensitive, small, handheld metal detectors, that can differentiate between gold and other metals. Then we could run each goldback through it whenever we were doing a trade, to make sure it wasn't counterfeit.
These devices could be taken to authorized locations for recalibration now and again. The standard would be the same for each calibration station, because gold is gold.
If my little metal detector doesn't read the goldback I am receiving correctly, I simply won't trade until I am satisfied about the particular goldback in question.
