Defcon hackers crack physical bitcoin Casascius coins

Defcon hackers crack physical bitcoin Casascius coins

The Casascius coin was shown to be vulnerable to physical attack at this year's Defcon conference, one of the world's largest hacker conventions. Casascius coins are one form of physical bitcoin, being supplied in denominations of 0.5, 1 and 25 BTC. The coins each have a private key printed on them, concealed by a holographic sticker. The Defcon hackers were able to reveal the key and replace the stick with virtually no sign of tampering. The private key on each Casascius coin relates to the bitcoin address that holds the value of the coin. The implication of having access to this coin is....


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Bitcoin Bowl Casascius Coin Available Now

With the Christmas holidays upon us, we are all opening up our presents and spending time with loved ones. Some of us will even receive cash as a gift, which we can use to treat ourselves to something nice. So why not purchase the only Casascius coin to be produced this year, and commemorate the St. Petersburg Bitcoin Bowl at the same time? For those of you who are unfamiliar with the name Casascius, allow me to give you a brief introduction. Casascius is a well-established brand of physical Bitcoins, created by Mike Caldwell. The first Casascius physical Bitcoin was created in 2011 and....

What's a Casascius coin?

A Casascius coin is the name of a certain type of physical - rather than purely digital -- bitcoin. Mike Caldwell, a resident of Sandy, Utah, in the US, first introduced physical bitcoins for purchase in 2011. He coined the name "Casascius" from an acronym for "call a spade a spade." Caldwell posts updates about his coins on the blog, "Casascius: You asked for change, I gave you coins." How does a Casascius work? Each coin holds the key to the digital value assigned to a particular bitcoin account. Though the coins are designed to reflect the relative worth of an account, they're actually....

Casascius Bitcoin Mint to Resume Sales, With a Twist

Bitcoin mint Casascius is back, resuming the sale of its products on a limited basis. The brainchild of entrepreneur Mike Caldwell, Utah-based Casascius coins was forced to shut down operations back in December. The company was effectively put out of business by the Financial Crimes Enforcement Network (FinCEN), after the agency classified Caldwell's activities as "money transmitting". At the time, Caldwell said he did not want to "argue" with FinCEN - though the decision was rather baffling, since he was merely minting physical coins. As of yesterday, Casascius is back in business - with....

Casascius Planning to Resume Coin Sales, With Some Exceptions

One month following the news that the Casascius physical bitcoin minting operation came to a grinding halt comes the news that some operations will resume selling some coins, according to a post this weekend. The post indicates that Mike Caldwell, who heads the operation, will soon begin selling the Casascius aluminum coin, which is unfunded and does not hold a value in bitcoin. Caldwell also indicates that he's planning to sell traditional Casascius coins, save for the fact they too will be unfunded - so as to not continue running a "money-transmitting" business, as seen by the U. S.....

Top 3 Physical Bitcoin Collectible Tokens

The beauty of Bitcoin is something that captures the imagination. The digital money is not tangible or typically viewable by human eye, minus the code and interfaces we use to interact with it. Over the past few years, people have tried to capture the essence of Bitcoin within physical tokens. Today, we will look at three physical Bitcoin alternatives and see how these creations turn the currency into a collectible art form. The popular Casascius physical Bitcoins have been around for quite some time, and older versions have been known to be quite valuable. The digital currency enthusiast....

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