Alpaca is one of the unofficial mascots for Bitcoin. The connection between Bitcoin and the Alpaca likely originated from the February 10, 2011 post on Slashdot which described various goods and services could be purchased with bitcoins. Because the slashdot crowd has a tendency to be critical or humorous (“Do alpacas really wear socks?”) the meme involving the Alpaca was born.
Bitcoin’s former lead developer Gavin Andresen tweeted that he had purchased wool socks with bitcoins.
In March, 2011 the What is Bitcoin? video described Alpaca socks as one of the products Bitcoins could buy.
The reference to Alpaca socks has since been mentioned in quite a number of blog posts, news reports and videos occurring in the months since