What it was
Silk Road opened in about January 2011 as a hidden service on Tor, the network that hides which computer is serving a site. Buyers and sellers reached it through the Tor browser, and payment worked one way only. The Second Circuit put it plainly: "Transactions on Silk Road exclusively used Bitcoins, an anonymous but traceable digital currency." Around the listings the site ran a private message system, a public forum and a wiki.
The trade was mostly drugs. According to the government, between 2011 and 2013 thousands of vendors used Silk Road to sell approximately $183 million worth of illegal drugs, along with false identification documents and computer hacking software. In October 2013 law enforcement seized the servers and shut the site down.
No legal entity has been established for the operation, which is why the structure here is left undocumented rather than claimed as absent.
Why it belongs in a Bitcoin directory
Silk Road was the first thing at any scale to run a functioning market with no bank, card network or payment processor in the loop. The same property cut the other way. Because every payment sat in a public ledger, the coins stayed traceable years after the site was gone, and the forfeiture below is what that looks like in practice.
On the record
A jury in the United States District Court for the Southern District of New York convicted Ross William Ulbricht on 4 February 2015 on all seven counts, among them distribution of narcotics, engaging in a continuing criminal enterprise, conspiracy to commit computer hacking, conspiracy to traffic in fraudulent identification documents and conspiracy to launder money. On 29 May 2015 the district court sentenced him principally to life imprisonment. The Second Circuit affirmed on 31 May 2017. The Justice Department's Office of the Pardon Attorney records a full pardon granted on 21 January 2025.
In a separate civil forfeiture action in the Northern District of California, the court's order of 25 March 2022 records the seizure of approximately 69,370 bitcoin, bitcoin gold, bitcoin SV and bitcoin cash taken from Silk Road addresses by a person the government calls Individual X, that both Individual X and the creator and owner of Silk Road consented to forfeiture, and that final judgment for the government was entered in 2022.