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.

This is a series 2 0.5 BTC Casascius Coin

Coin Details

• Address 1269s6viJi2JoG6YTab26gAMzHgDdp58FR
• Loaded on Apr 28, 2013
• Balance: 0.5 BTC

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