> [..] almost exactly like a market that uses only U.S. one dollar bills and doesn’t allow exchanging those bills… ever. [..] And they aren’t just any one dolla

> [..] almost exactly like a market that uses only U.S. one dollar bills and doesn’t allow exchanging those bills… ever. [..] And they aren’t just any one dollar bills: they are specific bills, each with its own unique serial number that can be checked against a U.S. Treasury database to make sure the money is real This guy is talking complete bullshit, it sounds like he heard "bitcoin is trackable" and extrapolated from there (i.e. totally made shit up) without actually researching the specifics. Bitcoin and all these other cryptocurrencies are fully-fungible, one bitcoin is the same as any other bitcoin and you can split and combine them up and down to whatever decimal places the protocol defines. There are no serial numbers. What is trackable is the account number (public key) that the money is associated with.