Today's Solana hack is a big L for closed-source wallets.

I just witnessed one big incident response zoom. Lots of speculation, low visibility. Seems Phantom and Slope each leaked secrets, but nobody can compare their keygen or key-handling code for commonalities.

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Potentially none. Yesterday people on a Twitter poll, I think, said they'd been drained after only using Phantom, but they may have been mistaken. 

Slope leaks seed phrases on generation. Other losses (Phantom + a few eth accounts) were likely all imported Slope seeds.

What secrets was Phantom leaking? I have their wallet (no funds in right now)

Sad indeed. Hopefully this will force sol teams to open source their code