The iconic 'Buy Bitcoin' sign held behind Janet Yellen during her televised Congressional testimony in July 2017 has been auctioned off for 16 BTC, or just over $1 million. Scarce.City facilitated the auction at PubKey, a Bitcoin-themed bar in New York City. The sign's new owner, known as Squirrekkywrath, is a mysterious figure in the Bitcoin community. The proceeds from the auction will contribute to funding Tirrel Corp, a Bitcoin layer-2 startup.