is this a joke?
it is funny on different levels though. obviously you can't "blacklist an address". it just created an additional cost for the owner to move the coins through a mixer and be done with it. but that is the obvious part. the funny thing is about the exchanges accepting the coins coming from these addresses which other users are discussing. what they are forgetting is that exchanges under US jurisdiction don't allow anyone from Iran to sign up in their exchange so it doesn't matter if they blacklist them or not. not to mention that they don't sign up there either because why would they? they can't deposit/withdraw fiat and there are other places where they can trade.
in any case i guess US dudes need some beginners training on what bitcoin is and how it works
If the miners decide as a group to blacklist an address by not inserting any transactions into the blockchain that contain it,
then it can't make it to a mixer.
Plus it only take 51% of the miners to make a blacklist happen with a PoW coin.
It seems you need the extra classes on how btc works.
FYI:
Imagine you run the company that run an ASIC Warehouse, the government approaches you , and says
"we have a list of known terrorists & criminal btc addresses, and we need you to make certain that you don't enter any transactions related to these address into the blockchain"
1. You comply and nothing happens to you,
(they may even get the utility to give you a cheaper rate on electricity prices).
or
2. You refuse and they cut the power to your Mining Equipment and place you on trial for aiding and abetting known criminals,
plus they confiscate all of your fiat as they claim it was ill gotten gain, which makes mounting a legal defense next to impossible,
Which do you choose?
(If you have a family , they will directly suffer if you are thrown in jail and won't be there to provide for them,
so what do you choose?)
* In the Beginning, when BTC was truly decentralizes and ran on PCs, No one knew the location of all of the miners (making the above scenario impossible), however now that mining requires warehouses full of ASICS drawing industrial amounts of electricity , tracking their location is as easy as a call to the utility companies .*
Unless someone finds a way to Decentralize BTC mining as it was in the beginning, it's current centralization will lead to global censorship.