Can anyone explain to me what they did there // explain me like I'm 5?

https://research.kudelskisecurity.com/2023/03/06/polynonce-a-tale-of-a-novel-ecdsa-attack-and-bitcoin-tears/

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Discussion

Your bitcoins can be stolen if you (or rather your wallets) use vulnerable random number generators

How can I find out if a wallet is vulnerable?

Store some bitcoins in it. If they are stolen then it's vulnerable.