In 2010, Mike Caldwell had the idea of buying a few hundred small metal washers and placing tamper-proof holograms on each side to secure a bitcoin private key inside.

He created the Casascius coin which went on to inspire hundreds of physical bitcoin representations.

2011 Casascius 1 bitcoin coin with spelling error in the hologram ("casacius" instead of "casascius")

Coin Details

• Address: 13hggLujJxJYFjuHWKG8MJCDwaB4FPorhK
• Funded date: 2011-09-15
• Balance: 1.0 BTC

Reserve Price: 1.0 BTC

Join the Scarce City Banter Telegram channel for auction updates, commentary, and sat giveaways.