Lowest block hash?

[SgtSpike]

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.

[Pieter Wuille]

00000000000000000ae2dba9951e28a3e6308ac7e9e8536104c503aa772c848f

Found 2 days ago, and would have beaten a difficulty of 100999279974...

[SgtSpike]

00000000000000000ae2dba9951e28a3e6308ac7e9e8536104c503aa772c848f

Found 2 days ago, and would have beaten a difficulty of 100999279974...

Wow, that's... more than 33,000 times the current difficulty!

notbad.jpg

[Gavin Andresen]

I wonder if that is the smallest sha256 hash ever found for any purpose...

[Yuhfhrh]

I wonder if that is the smallest sha256 hash ever found for any purpose...

That would be neat 

[MysteryMiner]

00000000000000000ae2dba9951e28a3e6308ac7e9e8536104c503aa772c848f

Found 2 days ago, and would have beaten a difficulty of 100999279974...

I thought that hash consisting from more than half of zeroes would be accidentally found by now.

[2GOOD]

00000000000000000ae2dba9951e28a3e6308ac7e9e8536104c503aa772c848f

Found 2 days ago, and would have beaten a difficulty of 100999279974...

Wow, that's... more than 33,000 times the current difficulty!

notbad.jpg

Crazy numbers 

[kjj]

00000000000000000ae2dba9951e28a3e6308ac7e9e8536104c503aa772c848f

Found 2 days ago, and would have beaten a difficulty of 100999279974...

I thought that hash consisting from more than half of zeroes would be accidentally found by now.

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.

[Pieter Wuille]

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 2^68.9897 double-SHA256 hashes.

That lowest hash found a few days ago is to be expected after 2^68.5558 hashes.

At the current hashrate, a hash with 128 zero bits is expected in about 400 million billion years.

[DeathAndTaxes]

00000000000000000ae2dba9951e28a3e6308ac7e9e8536104c503aa772c848f

Found 2 days ago, and would have beaten a difficulty of 100999279974...

I thought that hash consisting from more than half of zeroes would be accidentally found by now.

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. 

[etotheipi]

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.  Apparently block 125,552 has finally be dethroned...

[Pieter Wuille]

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.  Apparently block 125,552 has finally be dethroned...

Indeed. It's still number #2, which is impressive.

[MysteryMiner]

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.

Yes the half would be 2^128. And not a private 128-bit key, but symmetrical 128-bit key.

I just did not take into account that current number of blocks are way too small to get such result by luck.

[TTBit]

Is it possible to know what produced the lowest hash? i.e. f(x) --> lowest hash. What is f(x)?

[kjj]

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.

[grau]

This one is also neat:

00000000000addd111114dd2a982305a821a532ff77ddf658b9c468ef008033e

its a vanity block