Casascius coin

A Casascius coin is a physical Bitcoin coin that contains a private key to a certain amount of BTC, protected under a hologram. It’s essentially a cold wallet in the form of a collectible coin.

Key facts:

  • Creator: Mike Caldwell, a U.S. programmer.
  • Years produced: 2011–2013.
  • Materials: brass, bronze, sometimes silver or gold.
  • Denominations: from 0.1 to 1000 BTC.
  • Security: private key hidden under a hologram. Once removed, the coin is considered “redeemed”.

How does it work?

  1. Each coin includes a Bitcoin wallet address and a private key, hidden under a tamper-evident hologram.
  2. As long as the hologram is intact, the BTC inside are untouched.
  3. To access the funds, the hologram must be peeled off and the key used in a wallet.

Why is it valuable?

  • Historic rarity – production stopped in 2013 due to regulatory concerns in the U.S.
  • Collector’s value – unopened coins are highly sought after by crypto collectors.
  • Financial value – if BTC is still inside, the coin can be worth millions.
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