What is the longest used firstbits? How could I find out? I think it would be two vanity addresses with the same prefix, yes? Anything longer than about seven characters for a firstbits would require a lot of computation.
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I think I found the one with the longest firstbits http://blockchain.info/fb/1234567891234567891234567891w
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1aaaaaaaaaaa
" then somebody with vanitygen will just try to make two vanity addresses that have more characters in common. – Nick ODell May 29 '13 at 16:07