In fact, Bitcoin are fungible from a regulatory perspective: As every one USD is worth as another USD, every Bitcoin has same value as another Bitcoin and they are fully intechangeable without any change of value on both sides of the transaction.
Thats the reason why there are NFT - these are not fungible in that sense, as they are not interchangeable one by one, since one 1 NFT may have another value than the next NFT.
1. Spending dollars on US soil from an US bank account won't incur extra fees (at least visible to the person - I know about interchange fees, but they are borne by the merchant), while using card issued by a foreign bank can incur fees for cross-border transactions (at the level of 2-3% usually).
2. Sanctions and KYC concerns also make different dollars have different value. Money in US bank account of an US company employee can be used at face value - money in some less-favored country bank, not so much.
Anyone know if there's a monitoring program for serial numbers of interest?
The FBI gets out of bed for more inane things than maybe figuring out what happened to DB Cooper (he probably died during the jump or after landing) after all this time.
In practice, if you spend less than $10,000 a time, you'd probably be fine?
I just don't understand in practice how this is an issue.
Say you spend $100 on groceries with marked cash, how are you de-anonymised? The cash mixes in with all the rest of the cash from other registers and then gets picked up by Securicor and so on.
Never made sense to me!
US dollars are certainly worth less if they have a shady transaction history. That's why money laundering exists - I will pay you $100,000 in dirty money if you give me $95,000 in clean money.
Also, US dollars are non-fungible in a collectibles sense because certain id numbers on bills are valuable, older years are valuable (and condition matters). With coins there's a lot more, too - misprints and the like.
So I reject your idea. Either they are both fungible, or neither are.
They're not worth the same from a market perspective. When bitcoins are dirty they trade at lower price.
Some exchanges and banks to trace lets say the last 20 hops, and if these are OK, then they accept the coin. I know also about institutions which trace ALL hops, meaning: At their desk you cant ever sell a coin that has been in the dark only one day since its existance.
Most have a relaxed approach, like "if the coin wasnt in dirty hands for the last 5 or 6, its OK for us"
As long as this information balance exists, they are worth equal value
This brings to my mind: Chainalysis or the exchanges Co should offer such service like "bitcoin cleanyness lookup" or similar :-) (maybe some do already and Im not aware of...)
But the thing is: These service work wallet-based.