https://www.theguardian.com/technology/2017/nov/08/cryptocurrency-300m-dollars-stolen-bug-ether
More than $300m of cryptocurrency has been lost after a series of
bugs in a popular digital wallet service led one curious developer to
accidentally take control of and then lock up the funds, according to
reports.
Unlike most cryptocurrency hacks, however, the money wasn’t
deliberately taken: it was effectively destroyed by accident. The lost
money was in the form of Ether, the tradable currency that fuels the
Ethereum distributed app platform, and was kept in digital
multi-signature wallets built by a developer called Parity. These
wallets require more than one user to enter their key before funds can
be transferred.
On Tuesday Parity revealed that, while fixing a bug that let hackers
steal $32m out of few multi-signature wallets, it had inadvertently left
a second flaw in its systems that allowed one user to become the sole
owner of every single multi-signature wallet.
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