ELI5 please, I don't know why someone would want this.
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Vanity addresses!
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Nope, it's mined pub key a la bitcoin proof of work. It's about leading 0000 in pub key.
I can be used (on client side) to filter pubkey in a global feed.
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Thanks for clarifying
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Oh, I see. So I can lessen the spambots as they wouldn't have done a pubkey that only (almost certainly) would occur with this PoW method.
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