What is a Casascius Coin?

A Casascius Coin is a type of coin that is made to hold a small amount of digital currency, like Bitcoin. It's like a piggy bank for digital money.

Imagine you have some digital money, like a video game currency, you can put that digital money into a Casascius Coin, just like how you put money into a piggy bank. The coin is special because it has a hologram on it, and when you peel it off, it reveals a private key that you can use to access and spend your digital money.

It's similar to a physical representation of a digital currency and it's used as a way to store and secure digital money. It's also a way for people to collect them as a physical item, similar to how people collect coins or other collectibles.

In short, a Casascius Coin is a type of coin that holds digital money and can be used as a way to store and secure it, it's like a piggy bank for digital money. It's also a way to collect a physical representation of digital currency.

Simplified Example

Imagine you have a secret treasure that you want to keep safe. You decide to put the treasure inside a special toy that you have, like a toy car or a stuffed animal. You hide the treasure inside the toy and then give the toy to your friend to hold onto for you.

Your friend now has the toy, but they don't know that it contains your treasure. They just see a regular toy car or stuffed animal. But if you ever need to get your treasure back, you can ask your friend to give you the toy, and you can take out the treasure from inside.

A Casascius coin works in a similar way. It's like a special coin that contains a secret digital currency, like Bitcoin. Just like how you hid your treasure inside a toy, the digital currency is hidden inside the physical coin. When someone receives a Casascius coin, they just see a regular physical coin. But if they ever need to use the digital currency that's inside, they can "break open" the coin and access the currency.

Who Invented the Casascius Coin?

Mike Caldwell is renowned as the creator of the "Casascius coin," a pioneering physical manifestation of Bitcoin that gained prominence in the early days of the cryptocurrency's existence. Caldwell, a software engineer and visionary in the crypto sphere, introduced the Casascius physical Bitcoins in 2011. These coins, embedded with private keys that represented Bitcoin balances, allowed users to physically hold and transfer Bitcoin in a tangible form. Each coin's face value was tied to the amount of Bitcoin it represented. Caldwell's innovative approach to merging physical coins with digital currency earned him recognition in the crypto community, contributing to the broader acceptance and understanding of Bitcoin's potential as both a digital and physical asset. However, regulatory concerns led Caldwell to cease his production in 2013 due to legal uncertainties surrounding the minting of physical coins embedded with cryptocurrency value. His pioneering Casascius coins remain collector's items, symbolizing an early bridge between the digital world of cryptocurrency and the physical realm of tangible assets.


Brass Casascius Coins: The most common Casascius coin is the brass version, which contains a denomination of 1, 10, 25, 100, or 1000 BTC. These coins have a distinctive design that features the Bitcoin symbol and a hologram on one side, and the denomination and a unique public address on the other. Brass Casascius coins were minted in limited quantities and are now considered collector's items. However, they are no longer produced due to regulatory concerns and the risk of counterfeiting.

Gold Plated Casascius Coins: Gold plated Casascius coins were also produced in limited quantities and are considered rare collector's items. These coins have the same design and features as the brass version, but with a gold-plated finish. They were originally sold for a premium over the brass version due to their limited availability and high production costs.

Silver Casascius Coins: Silver Casascius coins were produced in very limited quantities and are considered the rarest and most valuable of all the Casascius coins. These coins have a denomination of 1 BTC and are made of solid silver. They have the same design and features as the brass and gold-plated versions, but with a unique serial number engraved on the edge. Due to their rarity and collectible value, silver Casascius coins have sold for thousands of dollars each in online auctions and on collector's markets.

Overall, Casascius coins represent a unique intersection of physical and digital currency. While they were produced in limited quantities and are no longer being minted due to regulatory concerns, they remain popular among bitcoin collectors and enthusiasts. Their unique design, tamper-evident holograms, and private key storage make them a valuable and sought-after addition to any cryptocurrency collection.

  • Multi-Coin Wallet: A multi-coin wallet is a cryptocurrency wallet that supports multiple types of cryptocurrencies, allowing users to store and manage multiple digital assets in one place.

  • Altcoin: The meaning of Altcoin refers of any cryptocurrency that isn't Bitcoin. The term "altcoin" is short for "alternative coin" and is often used to describe any cryptocurrency that is not Bitcoin.