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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.

Murch
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lurf jurv
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  • No easy way to find [the shortest](http://bitcoin.stackexchange.com/questions/7466/how-to-find-the-shortest-unused-firstbits), so it's not clear why you expect there was an easy way to find the longest, instead. – o0'. May 29 '13 at 15:20
  • @Lohoris The largest problem is that if you say "the longest firstbits is `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
  • @NickODell: Unless the longest firstbits is already so long that finding a longer one will be computationally prohibitive. – Meni Rosenfeld May 30 '13 at 13:02
  • Finding the shortest one unused is rather different than finding the longest one used, IMO. – lurf jurv Jun 01 '13 at 18:53
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    It is valid (see http://uncaptcha.net/bitcoin.php ), but I think nobody has the private key... Chance to choice valid address is 1 : 4 billions which is no computational problem... –  Nov 11 '13 at 08:13
  • related: https://bitcoin.stackexchange.com/q/3730/5406 – Murch Aug 11 '20 at 13:05

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I think I found the one with the longest firstbits http://blockchain.info/fb/1234567891234567891234567891w

lurf jurv
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