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....


Related News

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....

$2 Billion Worth of Unpeeled Casascius Physical Bitcoins: There’s Less Than 2...

While bitcoin continues to become more scarce every day, the most popular set of physical bitcoins, crafted by Mike Caldwell from 2011 to 2013, have become far scarcer than their digital counterparts. As of September 18, 2021, there are now less than 20,000 active bitcoins from the Casascius physical bitcoin collection. Casascius Physical Bitcoin Collection Grows Scarcer Bitcoin has become a well-known technology and in the early years a number of people and companies deployed concepts called “physical bitcoins.” Essentially, a group or individual would fabricate a coin with....

Last Month Casascius Owners Redeemed the Highest Number of Physical Bitcoins ...

On November 30, 2020, bitcoin crossed an all-time price high on a few global exchanges and between spot and derivatives markets there’s been a lot of action. One metric people didn’t notice was the fact that November 2020 saw the most number of redeemed Casascius physical bitcoins in three years. Approximately 92 coins were peeled throughout the last 30 days and there are only 20,686 Casascius physical bitcoins left active. In the bitcoin world, there are a number of coins that hold numismatic value, which means the bitcoin could be worth more than the spot market value of the....

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....