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Tldr:

Bug in the randomness of BitcoinJS which was created by Stefan Thomas. Used in blockchain.info wallets. Vulnerability called Randstorm. Can check wallet at https://www.keybleed.com

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The link above is likely trustworthy but people should NOT put their wallet details into random websites.

Why is that risky?

If, as the article claims, there is a vulnerability in certain wallets, then checking said vulnerable wallets could expose them to attack.

The website only asks for the public key

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