The article is about stablecoins, which mainly live on smart-contract-enabled blockchains (ie, not Bitcoin). I don't think there are many (if any) major smart c

The article is about stablecoins, which mainly live on smart-contract-enabled blockchains (ie, not Bitcoin). I don't think there are many (if any) major smart contract chains out there still using PoW, which I assume your concern is about. Solana's PoH also uses hashes, but I'm not sure what kind of threat that would be (would probably depend on the exact nature of the 'breaking'). Most other major chains such as Ethereum use PoS. The bigger concern would be breaking the asymmetric cryptography those chains use. That would absolutely kill the protocols in their current form (but could probably be fixed by switching to a different crypto standard).