JavaScript SecureRandom() isn’t securely random — many old web wallets affected — and the bug was warned of five years ago (UPDATED)
If you used a web wallet to generate your keys, check with your author or vendor.
Attack of the 50 Foot Blockchain
Blockchain and cryptocurrency news and analysis by David Gerard
If you used a web wallet to generate your keys, check with your author or vendor.
Yet another Bitcoin fork. And Bitcoin core considers striking back, particularly against SegWit2x.