Title: Lowest block hash? Post by: SgtSpike on November 08, 2012, 12:00:44 AM Does anyone know what the lowest block hash in the blockchain is? The one with the most zeroes before it?
Just curious, this isn't for anything truly useful. Title: Re: Lowest block hash? Post by: Pieter Wuille on November 08, 2012, 12:06:47 AM 00000000000000000ae2dba9951e28a3e6308ac7e9e8536104c503aa772c848f
Found 2 days ago, and would have beaten a difficulty of 100999279974... Title: Re: Lowest block hash? Post by: SgtSpike on November 08, 2012, 12:13:16 AM 00000000000000000ae2dba9951e28a3e6308ac7e9e8536104c503aa772c848f Wow, that's... more than 33,000 times the current difficulty!Found 2 days ago, and would have beaten a difficulty of 100999279974... notbad.jpg Title: Re: Lowest block hash? Post by: Gavin Andresen on November 08, 2012, 02:15:39 AM I wonder if that is the smallest sha256 hash ever found for any purpose...
Title: Re: Lowest block hash? Post by: Yuhfhrh on November 08, 2012, 02:17:41 AM I wonder if that is the smallest sha256 hash ever found for any purpose... That would be neat :D Title: Re: Lowest block hash? Post by: MysteryMiner on November 08, 2012, 03:23:15 AM 00000000000000000ae2dba9951e28a3e6308ac7e9e8536104c503aa772c848f I thought that hash consisting from more than half of zeroes would be accidentally found by now.Found 2 days ago, and would have beaten a difficulty of 100999279974... Title: Re: Lowest block hash? Post by: 2GOOD on November 08, 2012, 10:14:26 AM 00000000000000000ae2dba9951e28a3e6308ac7e9e8536104c503aa772c848f Wow, that's... more than 33,000 times the current difficulty!Found 2 days ago, and would have beaten a difficulty of 100999279974... notbad.jpg Crazy numbers :o Title: Re: Lowest block hash? Post by: kjj on November 08, 2012, 12:24:51 PM 00000000000000000ae2dba9951e28a3e6308ac7e9e8536104c503aa772c848f I thought that hash consisting from more than half of zeroes would be accidentally found by now.Found 2 days ago, and would have beaten a difficulty of 100999279974... 2128 is an absurdly large number. I did the math a couple of months ago, and at that time I think I had figured out that the bitcoin project has managed to do about 268 hashes in 4 years. That is actually pretty consistent with this lowest hash. Title: Re: Lowest block hash? Post by: Pieter Wuille on November 08, 2012, 12:34:43 PM 2128 is an absurdly large number. I did the math a couple of months ago, and at that time I think I had figured out that the bitcoin project has managed to do about 268 hashes in 4 years. That is actually pretty consistent with this lowest hash. We're currently at 268.9897 double-SHA256 hashes. That lowest hash found a few days ago is to be expected after 268.5558 hashes. At the current hashrate, a hash with 128 zero bits is expected in about 400 million billion years. Title: Re: Lowest block hash? Post by: DeathAndTaxes on November 08, 2012, 12:50:07 PM 00000000000000000ae2dba9951e28a3e6308ac7e9e8536104c503aa772c848f I thought that hash consisting from more than half of zeroes would be accidentally found by now.Found 2 days ago, and would have beaten a difficulty of 100999279974... Half is deceptive due to the nature of binary. In the first half of the digits there are 2^128 possibilities. Getting all zeroes is one of out 2^128 possibilities the chance of doing that is just as remote as brute forcing a 2^128 private key. Given the number of hashes attempted so far the odds we would have found a hash with 32 zero prefix is about one in one million quadrillion. Title: Re: Lowest block hash? Post by: etotheipi on November 08, 2012, 01:34:53 PM FYI, I previously posted on this topic, finding that block 125,552 had a hash that would've been valid at 36,000,000,000 difficulty (https://bitcointalk.org/index.php?topic=29675.0). Apparently block 125,552 has finally be dethroned...
Title: Re: Lowest block hash? Post by: Pieter Wuille on November 08, 2012, 01:57:45 PM FYI, I previously posted on this topic, finding that block 125,552 had a hash that would've been valid at 36,000,000,000 difficulty (https://bitcointalk.org/index.php?topic=29675.0). Apparently block 125,552 has finally be dethroned... Indeed. It's still number #2, which is impressive. Title: Re: Lowest block hash? Post by: MysteryMiner on November 08, 2012, 03:01:58 PM Quote Half is deceptive due to the nature of binary. Yes the half would be 2^128. And not a private 128-bit key, but symmetrical 128-bit key.In the first half of the digits there are 2^128 possibilities. Getting all zeroes is one of out 2^128 possibilities the chance of doing that is just as remote as brute forcing a 2^128 private key. Given the number of hashes attempted so far the odds we would have found a hash with 32 zero prefix is about one in one million quadrillion. I just did not take into account that current number of blocks are way too small to get such result by luck. Title: Re: Lowest block hash? Post by: TTBit on November 08, 2012, 04:06:57 PM Is it possible to know what produced the lowest hash? i.e. f(x) --> lowest hash. What is f(x)? Title: Re: Lowest block hash? Post by: kjj on November 08, 2012, 04:14:46 PM Is it possible to know what produced the lowest hash? i.e. f(x) --> lowest hash. What is f(x)? f(x) is SHA256(SHA256(x)) and x is the block header (https://en.bitcoin.it/wiki/Block_hashing_algorithm). Title: Re: Lowest block hash? Post by: grau on November 08, 2012, 09:33:46 PM This one is also neat:
00000000000addd111114dd2a982305a821a532ff77ddf658b9c468ef008033e its a vanity block :) |