You sell the clean first. You are assumed to always be holding 0.1 dirty coins, so you must keep a balance > 0.1 at all times to avoid spending the dirty coins.
If were in your shoes I'd start with optimizing the coin and the surface it falls on. Gambling cheaters will coat their hands with sticky stuff so they can take an extra chip here or there, if you coat the edge of the coin with that kind of stuff it would help I think.
Without knowing what sort of influence it has — it’s difficult to construct a general method,
though, please check my idea and see if this achieves the purpose.
First you find a gambler, any gambler and ask them to show you the lowest denomination coin they have, and get them to verify for you that it is a fair coin. Now demonstrate your weird coin to them, and when they are amazed by its properties, swap it with them for the fair coin. Done.
I have seen fake pound coins in the wild. My brother who does electronics work on fruit machines (low-stakes gambling terminals) has said he sees them all the time.
I couldn't tell you whether defrauding such machines is the 'killer app' to drive coin counterfeiting on a large scale. The UK has millions of betting machines with small payouts (e.g. £50) but a smaller number with larger payouts, concentrated in betting shops, casinos etc.
But how effective are they if you’re putting in half of the tumbler’s pot? As in, if you put in a quarter of a million dollars, and others do too, you have a high likelihood of getting some of yours back. So the coins are still traceable to you.
I wonder what the false negative rate for this coin will be in vending machines. When the coins are subjected to real-world conditions, will this reduce the coin's ability to authenticate with the vending machine? If the coins are being authenticated using a chemical marker of some kind, will the coins' exposure to other chemicals, dirt, or temperature affect the coins' ability to authenticate?
You do realize there are almost 100 000 coins out there. How many of those have you actually researched about and come to the conclusion that they lacked "real world utility". Does a casino provide "real world utility"? What about a boxing match.. is there any "real world utility" in that?
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