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The US Government Is Powerless to Block Bitcoin Addresses
It has been widely reported this week that the U.S. government has blacklisted two BTC addresses linked to cyber crime. These particular addresses were singled out because their owners are believed to be Iranians, whose country is currently facing heavy economic sanctions from the U.S. While the BTC addresses are clearly connected to ransomware, mainstream media has gotten one crucial element of the story wrong: You can't blacklist a bitcoin address.
Bitcoin: Unblockable Since 2009
The Office of Foreign Assets Control (OFAC) is the financial intelligence wing of the U.S. Treasury Department. It enforces economic sanctions against foreign entities the American government has taken exception to. Right now, it has Iran in its sights. By OFAC's own admission, however, trying to blacklist bitcoin addresses is a first. "While OFAC routinely provides identifiers for designated persons, today's action marks the first time OFAC is publicly attributing digital currency addresses to designated individuals," explained the agency, adding:
Like traditional identifiers, these digital currency addresses should assist those in the compliance and digital currency communities in identifying transactions and funds that must be blocked and investigating any connections to these addresses. As a result of today's action, persons that engage in transactions with [these addresses] could be subject to secondary sanctions.
You Can't Blacklist a Bitcoin Address
The addresses in question, 149w62rY42aZBox8fGcmqNsXUzSStKeq8C and 1AjZPMsnmpdK2Rv9KQNfMurTXinscVro9V, have been involved in over 7,000 transactions since 2013 and received close to 6,000 BTC. As of Nov. 28, anyone interacting with these addresses could technically be held liable by the U.S. government and punished in some way. In reality, though, these threats are little more than empty words. No one — not even the U.S. government, with its army of apparatchiks and enforcers — can prevent a specific address from sending or receiving bitcoin. With cryptocurrencies such as EOS or ripple, OFAC would likely have more success, but decentralized assets such as BTC and BCH are uncensorable.