Man Auctioning Famous 'Buy Bitcoin' Sign From 2017 Yellen Testimony

• Christian Langalis is auctioning the "Buy Bitcoin" sign he held up behind Janet Yellen during her Congressional testimony in 2017

• The sign will be auctioned on Scarce City, an online marketplace for collectibles, starting April 18 for 1 week

• Langalis received a private offer of 5 BTC (around $350K) for the sign, but there is no reserve price set

• Final bids will be taken in person on April 24 at PubKey, a bitcoin-themed bar in New York

• Langalis held up the sign when bitcoin traded around $2,400; he was escorted out for violating committee rules but the image went viral