j"19HxigV4QyBv3tHpQVcUEQyq1pzZVdoAutL½For scaleabilty and security you need to be able to distribute and decentralize asics hashing. Double hashing enables this since it can be split into two different functions in same system.
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https://whatsonchain.com/tx/2fc064390a0e4e42a0930bbfd231333ec6c6cb3239de4061efb2566203d954b8