Suppose you wish to register ownership of a house/car/etc. The government might want to collect taxes at that point. Instead of asking that you remit money with

Suppose you wish to register ownership of a house/car/etc. The government might want to collect taxes at that point. Instead of asking that you remit money with the specific agency, you are asked to buy "govt authorized stamps" (from a central agency) worth the same amount and affix it to the registration documents as proof of payment.