Here's Proof that the BITMAIN AntMiner S1 can find a block!
Unfortunate for me, I was mining in a pool which doesn't give any extra reward (to normal someone else finding a block) for finding a block yourself.
Anyhow, is there a way to see from the AntMiner itself which block this actually was? I haven't turned any extra-logging on aside what is enabled by BITMAIN as default.
NoUnfortunate for me, I was mining in a pool which doesn't give any extra reward (to normal someone else finding a block) for finding a block yourself.
Anyhow, is there a way to see from the AntMiner itself which block this actually was? I haven't turned any extra-logging on aside what is enabled by BITMAIN as default.
The only way to know for certain is to have the cgminer log which will show the first 4 non zero bytes of the block hash next to the diff.
These standalone devices don't like setting the logging (due to extreme space limitations of the cheap hardware that runs linux in them)
If you calculate it accurately enough, you should be able to get enough of the start of the hash to match the block.
However, it's not 0x00000000FF....FF
I think it's 0x00000000FFFFFFFFFFFFFFFF00...00 (not 100% sure)
Edit: meh, since I got a block recently I guess I should calculate it myself and see if I can work it out what is the correct one to use ...
It's actually 0x00000000FFFF00...00
So I wrote some php using bcmath and another function I found on the net to accurately convert number bases ...
And it came up with: 6023087568 -> b68bf5860d85f2a9528d572ef0820077d523f91b33e9cca2
Now looking at blocks over the last week starting with 0000b68b I found:
286662,0000000000000000b68bf585f10b1436ff7e6471e2e40d040f94eadc526f16c5,2,
4c071ba9dfb373bfc796a26b2514c7aeb13428c60ac034d96c7e37e9d66b1744,1392794888,
20140219082808UTC,549088256,19015f53,3129573174.52228737,
000000000000000050c45d24df1a0048f0f39d2d4e9f0598ca201f76fd980524
Which is almost certainly the block you found.
Edit: and anyone wanting to do this themselves:
You need PHP and PHP BCMath installed
Here's hex.php:
Code:
#
function basecvt($str, $frombase=10, $tobase=16)
{
$str = trim($str);
if (intval($frombase) != 10)
{
$len = strlen($str);
$q = 0;
for ($i=0; $i<$len; $i++)
{
$r = base_convert($str[$i], $frombase, 10);
$q = bcadd(bcmul($q, $frombase), $r);
}
}
else
$q = $str;
if (intval($tobase) != 10)
{
$s = '';
while (bccomp($q, '0', 0) > 0)
{
$r = intval(bcmod($q, $tobase));
$s = base_convert($r, 10, $tobase) . $s;
$q = bcdiv($q, $tobase, 0);
}
}
else
$s = $q;
return $s;
}
#
function bctrim($num0)
{
if (strpos($num0, '.') === false)
return $num0;
else
return rtrim(rtrim($num0, '0'), '.');
}
#
$diff = $argv[1];
#
bcscale(1000);
#
$d1_sp = '00000000 FFFF0000 00000000 00000000 00000000 00000000 00000000 00000000';
$d1_16 = str_replace(' ', '', $d1_sp);
$d1_0 = basecvt($d1_16, 16, 10);
$d1_10 = bctrim($d1_0);
#
$blk0 = bcdiv($d1_10, $diff);
$blk10 = bctrim($blk0);
$blk16 = basecvt($blk10, 10, 16);
#
echo "diff=$diff\n";
echo "d1_16=$d1_16\n";
echo "blk10=$blk10\n";
echo "blk16=$blk16\n";
#
?>
php hex.php 6023087568
and blk16 is your block hash (accurate to about 6 nibbles)
