Copy known good serial number + signature.

combine with a central authority server network and make it blind signatures and you have untraceable e-cash.

	▲	lxgr 3 hours ago \| parent \| next [-]
		Blind signatures don’t work like that. Once you unblind them, they are very traceable. Chaumian e-cash can only be spent once for that reason.
	▲	mitxela 3 hours ago \| parent \| prev [-]
		No government wants untraceable e-cash. They want it fully traceable.