White Hat Hacker "johoe" Who Rescued 870 BTC Is Computer Science Researcher from Germany

The white hat hacker "joehoe", who recently exposed flaws in blockchain.info wallets, is reportedly a computer science researcher at a university in Germany. His given name in Jochen.

Speaking on Let's Talk Bitcoin, he described how he "rescued" over 870 BTC (worth $278,000 at today's prices) from hundreds of vulnerable wallets. He is also the one who salvaged 17 BTC ($5,400) from faulty Counterparty wallets.

In both cases, he detected the "R-value issue." Wallets were created with recycled "R-values" in formulas that generate random numbers, allowing the private keys to be calculated from the public keys.

Before malicious hackers were able to exploit the flaw, Jochen preemptively "stole" the contents of these wallets, later returning them to Blockchain Blockchain Blockchain comprises a digital network of blocks with a comprehensive ledger of transactions made in a cryptocurrency such as Bitcoin or other altcoins.One of the signature features of blockchain is that it is maintained across more than one computer. The ledger can be public or private (permissioned.) In this sense, blockchain is immune to the manipulation of data making it not only open but verifiable. Because a blockchain is stored across a network of computers, it is very difficult to tampe Blockchain comprises a digital network of blocks with a comprehensive ledger of transactions made in a cryptocurrency such as Bitcoin or other altcoins.One of the signature features of blockchain is that it is maintained across more than one computer. The ledger can be public or private (permissioned.) In this sense, blockchain is immune to the manipulation of data making it not only open but verifiable. Because a blockchain is stored across a network of computers, it is very difficult to tampe Read this Term.info for redistribution.

When stumbling upon Bitcoin Bitcoin While some may still be wondering what is Bitcoin, who created Bitcoin, or how does Bitcoin work, one thing is certain: Bitcoin has changed the world.No one can remain indifferent to this revolutionary, decentralized, digital asset nor to its blockchain technology.In fact, we’ve gone a long way ever since a Florida resident Laszlo Hanyecz made BTC’s first official commercial transaction with a real company by trading 10,000 Bitcoins for 2 pizzas at his local Papa John’s.One could now argue that While some may still be wondering what is Bitcoin, who created Bitcoin, or how does Bitcoin work, one thing is certain: Bitcoin has changed the world.No one can remain indifferent to this revolutionary, decentralized, digital asset nor to its blockchain technology.In fact, we’ve gone a long way ever since a Florida resident Laszlo Hanyecz made BTC’s first official commercial transaction with a real company by trading 10,000 Bitcoins for 2 pizzas at his local Papa John’s.One could now argue that Read this Term in 2013, he first discovered the bug in Android's random number generator which compromised the security of some Bitcoin wallet apps.

Approaching the issue from a scientific perspective, he was originally not even cognizant of the fact that the wallets were generated by blockchain.info - a response to some detractors who alleged that he was just trying to hack the service to prove its security holes.