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1141  Bitcoin / Bitcoin Discussion / Re: Bitcoin mobile. on: July 17, 2010, 05:09:37 AM
I think this idea deserves more recognition.

A phone is much more accessible and widely available than a computer. There are many, many people for whom they only got a phone.

Even some kind of SMS / gateway / key exchange would be something... being able to send a payment by sms to a gateway server with an unsupported phone to a supported phone, for example, or to a trusted third party who can handle the transaction for us.
By rolling passcode perhaps.

That would fantastic, and possibly not too much of a major overhaul needed?

Inspired?

I am working on an open source SMS project that may be capable of providing this capability.  However, I am not so familiar with how payment would be handled by text messages.
1142  Economy / Marketplace / Re: Buying bitcoins, wild-west style on: July 17, 2010, 05:04:49 AM
How would it be possible to use SMS to buy/sell bitcoins?
1143  Bitcoin / Development & Technical Discussion / Calculate Hash Target and Probability in PHP on: July 17, 2010, 04:37:09 AM
I am trying to prepare PHP code to calculate exact value for Hash Target similar as to displayed at http://www.alloscomp.com/bitcoin/calculator.php (currently: 1.48501965484E+65).

Can someone help me to refine my code?

http://jsonrpcphp.org/?page=download&lang=en

Calculate current hash target:
Code:
<?
header("Content-type: text/plain");
require_once 'jsonRPCClient.php';
$data=new jsonRPCClient('http://127.0.0.1:8332');
$difficulty = floatval($data->getdifficulty());
//     $a      /         $b
// (2^256 - 1) / (2^32 * difficulty)

bcscale(256);

$a = bcsub(bcpow(2,256),1);
//$a = gmp_strval(gmp_sub(gmp_pow(2,256),1));

$b = bcmul(bcpow(2,32),$difficulty);
//$b = pow(2,32) * $difficulty;

bcscale(0);

$target = bcdiv($a,$b);
//$target = gmp_strval(gmp_div($a,$b));
//$target = bcdiv($a,$b);
//$target = "148504231478890412392775945444335243545681910455595839046778120430";
//$target = "148504231478000000000000000000000000000000000000000000000000000000";
//$target = "148501965484000000000000000000000000000000000000000000000000000000";

//000000000168fd00000000000000000000000000000000000000000000000000
//         168fcfffffee48119ddbfdc811138960d70605cc300000000000000

$targethex = gmp_strval(gmp_sub($target,0),16);

echo "Current Hash Target: Dec($target)    Hex($targethex)";
?>

Calculate probability:
Code:
<?
bcscale(256);
$pph = bcdiv($target,bcpow(2,256)); // probability per hash
if (isset($_GET["r"]) && $_GET["r"] != "") { // user-defined rate
$rate = $_GET["r"];
if (is_numeric($rate)) {
function humantime($secs) {
if ($secs<0) return false;
$m = (int)($secs / 60); $s = $secs % 60; $s = ($s <= 9) ? "0$s" : $s;
$h = (int)($m / 60); $m = $m % 60; $m = ($m <= 9) ? "0$m" : $m;
$d = (int)($h / 24); $h = $h % 24;
return $d."d $h:$m:$s";
}
$pps = bcdiv(bcmul($target,1000),bcpow(2,256)); // probability per second
bcscale(16);
$ppr = bcmul($pps,$rate);
$etaAvg = humantime(bcdiv(1,$ppr));
$eta25 = humantime(bcdiv(-log(.75),$ppr));
$eta50 = humantime(bcdiv(-log(.5),$ppr));
$eta75 = humantime(bcdiv(-log(.25),$ppr));
$eta95 = humantime(bcdiv(-log(.05),$ppr));
$eta99 = humantime(bcdiv(-log(.01),$ppr));
echo "ProbabilityPerSecond($ppr) Avg($etaAvg) 25%($eta25) 50%($eta50) 75%($eta75) 95%($eta95) 99%($eta99)";
} else echo "This requires either no argument or a numeric argument representing khash/sec.";
}
else {
bcscale(32);
$pph = bcmul($pph,1);
echo "ProbabilityPerHash($pph)";
}
?>
1144  Bitcoin / Development & Technical Discussion / SMS/Text Messaging Integration? on: July 17, 2010, 12:42:19 AM
is there any usefulness for SMS/Text Messaging integration with Bitcoin in any way?
1145  Bitcoin / Development & Technical Discussion / Re: Some Statistics on: July 16, 2010, 05:48:00 AM
If you have a local ap (apache+php) server, you can run this code and keep it open in browser window and it should update approximately every second.  It isn't 100% precise, but fairly close.

Added: <MacRohard> last=$(date +%s); tail -F debug.log | grep --line-buffered height= | sed -u 's/.*\(height=\(.*\)\)/\2/g' | while read line; do now=$(date +%s); delta=$(( $now - $last)); echo $now $delta $line; last=$now; done
1146  Bitcoin / Development & Technical Discussion / Some Statistics on: July 16, 2010, 05:24:25 AM
http://nullvoid.org/bitcoin/statistix.php
http://nullvoid.org/bitcoin/statistix.php?showallblocks (if you want to see timestamps for all 69,000+ blocks until now) (2.5Mb+ output)
http://jsonrpcphp.org/?page=download&lang=en

statistix.php
Code:
<?
header("Content-type: text/html");
require_once 'jsonRPCClient.php';
$data=new jsonRPCClient('http://127.0.0.1:8332');
$blockcount = $data->getblockcount();
$now = date("U");

$blockfile = "blockdata";
$data = file($blockfile, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES); array_pop($data);
foreach ($data as $line) {
$blocks = strtok($line, " ");
$date = strtok(" ");
$avghash = strtok(" ");
}
?><html>
 <head>
  <meta http-equiv="refresh" content="100000">
 </head>
 <body><pre>
<?
$data = array_reverse($data);
echo " /-             Statistix             -\\\n";
echo "|            <a href=\"http://bitcointalk.org/index.php?topic=402.msg3395#msg3395\">PHP Source Code</a>            |\n";
echo "|---------------------------------------|\n";
echo "|   Last block discovered in duration   |\n";
echo "|       and when it was discovered      |\n";
echo "|---------------------------------------|\n";
echo "|          Now  $now              |\n";
$lastdate = $now - $date; $lastdate .= ($lastdate == 1) ? " sec" : " secs"; $lastdate .= str_repeat(" ", 10 - strlen($lastdate));
$lastblock = trim($blocks); $lastblock .= str_repeat(" ", 12 - strlen($lastblock));
echo "|   Last Block  $lastdate:$lastblock |\n";
$block = array();
foreach ($data as $line) {
$blocks = strtok($line, " ");
$date = strtok(" ");
$avghash = strtok(" ");
$block[$blocks] = $date;
if (($now - 60) <= $date) { $min01date = $date; $min01blocks = $blocks; }
if (($now - 120) <= $date) { $min02date = $date; $min02blocks = $blocks; }
if (($now - 180) <= $date) { $min03date = $date; $min03blocks = $blocks; }
if (($now - 240) <= $date) { $min04date = $date; $min04blocks = $blocks; }
if (($now - 300) <= $date) { $min05date = $date; $min05blocks = $blocks; }
if (($now - 600) <= $date) { $min10date = $date; $min10blocks = $blocks; }
if (($now - 1200) <= $date) { $min20date = $date; $min20blocks = $blocks; }
if (($now - 1800) <= $date) { $min30date = $date; $min30blocks = $blocks; }
if (($now - 2400) <= $date) { $min40date = $date; $min40blocks = $blocks; }
if (($now - 3000) <= $date) { $min50date = $date; $min50blocks = $blocks; }
if (($now - 3600) <= $date) { $hr01date = $date; $hr01blocks = $blocks; }
if (($now - 7200) <= $date) { $hr02date = $date; $hr02blocks = $blocks; }
if (($now - 10800) <= $date) { $hr03date = $date; $hr03blocks = $blocks; }
if (($now - 14400) <= $date) { $hr04date = $date; $hr04blocks = $blocks; }
if (($now - 18000) <= $date) { $hr05date = $date; $hr05blocks = $blocks; }
if (($now - 21600) <= $date) { $hr06date = $date; $hr06blocks = $blocks; }
if (($now - 51200) <= $date) { $hr12date = $date; $hr12blocks = $blocks; }
if (($now - 102400) <= $date) { $day1date = $date; $day1blocks = $blocks; }
if (($now - 204800) <= $date) { $day2date = $date; $day2blocks = $blocks; }
if (($now - 307200) <= $date) { $day3date = $date; $day3blocks = $blocks; }
if (($now - 409600) <= $date) { $day4date = $date; $day4blocks = $blocks; }
if (($now - 512000) <= $date) { $day5date = $date; $day5blocks = $blocks; }
if (($now - 614400) <= $date) { $day6date = $date; $day6blocks = $blocks; }
if (($now - 716800) <= $date) { $wk01date = $date; $wk01blocks = $blocks; }
if (($now - 1433600) <= $date) { $wk02date = $date; $wk02blocks = $blocks; }
if (($now - 2150400) <= $date) { $wk03date = $date; $wk03blocks = $blocks; }
if (($now - 2867200) <= $date) { $wk04date = $date; $wk04blocks = $blocks; }
if (($now - 5734400) <= $date) { $wk08date = $date; $wk08blocks = $blocks; }
if (($now - 11468800) <= $date) { $wk16date = $date; $wk16blocks = $blocks; }
if (($now - 22937600) <= $date) { $wk32date = $date; $wk32blocks = $blocks; }
if (($now - 37376000) <= $date) { $yr1date = $date; $yr1blocks = $blocks; }
}

if ($min01blocks == "") $min01 = ""; else $min01 = "$min01date:$min01blocks";
if ($min02blocks == "") $min02 = ""; else $min02 = "$min02date:$min02blocks";
if ($min03blocks == "") $min03 = ""; else $min03 = "$min03date:$min03blocks";
if ($min04blocks == "") $min04 = ""; else $min04 = "$min04date:$min04blocks";
if ($min05blocks == "") $min05 = ""; else $min05 = "$min05date:$min05blocks";
if ($min10blocks == "") $min10 = ""; else $min10 = "$min10date:$min10blocks";
if ($min20blocks == "") $min20 = ""; else $min20 = "$min20date:$min20blocks";
if ($min30blocks == "") $min30 = ""; else $min30 = "$min30date:$min30blocks";
if ($min40blocks == "") $min40 = ""; else $min40 = "$min40date:$min40blocks";
if ($min50blocks == "") $min50 = ""; else $min50 = "$min50date:$min50blocks";
if ($hr01blocks == "") $hr01 = ""; else $hr01 = "$hr01date:$hr01blocks";
if ($hr02blocks == "") $hr02 = ""; else $hr02 = "$hr02date:$hr02blocks";
if ($hr03blocks == "") $hr03 = ""; else $hr03 = "$hr03date:$hr03blocks";
if ($hr04blocks == "") $hr04 = ""; else $hr04 = "$hr04date:$hr04blocks";
if ($hr05blocks == "") $hr05 = ""; else $hr05 = "$hr05date:$hr05blocks";
if ($hr06blocks == "") $hr06 = ""; else $hr06 = "$hr06date:$hr06blocks";
if ($hr12blocks == "") $hr12 = ""; else $hr12 = "$hr12date:$hr12blocks";
if ($day1blocks == "") $day1 = ""; else $day1 = "$day1date:$day1blocks";
if ($day2blocks == "") $day2 = ""; else $day2 = "$day2date:$day2blocks";
if ($day3blocks == "") $day3 = ""; else $day3 = "$day3date:$day3blocks";
if ($day4blocks == "") $day4 = ""; else $day4 = "$day4date:$day4blocks";
if ($day5blocks == "") $day5 = ""; else $day5 = "$day5date:$day5blocks";
if ($day6blocks == "") $day6 = ""; else $day6 = "$day6date:$day6blocks";
if ($wk01blocks == "") $wk01 = ""; else $wk01 = "$wk01date:$wk01blocks";
if ($wk02blocks == "") $wk02 = ""; else $wk02 = "$wk02date:$wk02blocks";
if ($wk03blocks == "") $wk03 = ""; else $wk03 = "$wk03date:$wk03blocks";
if ($wk04blocks == "") $wk04 = ""; else $wk04 = "$wk04date:$wk04blocks";
if ($wk08blocks == "") $wk08 = ""; else $wk08 = "$wk08date:$wk08blocks";
if ($wk16blocks == "") $wk16 = ""; else $wk16 = "$wk16date:$wk16blocks";
if ($wk32blocks == "") $wk32 = ""; else $wk32 = "$wk32date:$wk32blocks";
if ($yr1blocks == "") $yr1 = ""; else $yr1 = "$yr1date:$yr1blocks";

echo "|    1min  ago  ".$min01.str_repeat(" ", 24 - strlen($min01))."|\n";
echo "|    2min  ago  ".$min02.str_repeat(" ", 24 - strlen($min02))."|\n";
echo "|    3min  ago  ".$min03.str_repeat(" ", 24 - strlen($min03))."|\n";
echo "|    4min  ago  ".$min04.str_repeat(" ", 24 - strlen($min04))."|\n";
echo "|    5min  ago  ".$min05.str_repeat(" ", 24 - strlen($min05))."|\n";
echo "|   10min  ago  ".$min10.str_repeat(" ", 24 - strlen($min10))."|\n";
echo "|   20min  ago  ".$min20.str_repeat(" ", 24 - strlen($min20))."|\n";
echo "|   30min  ago  ".$min30.str_repeat(" ", 24 - strlen($min30))."|\n";
echo "|   40min  ago  ".$min40.str_repeat(" ", 24 - strlen($min40))."|\n";
echo "|   50min  ago  ".$min50.str_repeat(" ", 24 - strlen($min50))."|\n";
echo "|    1hr   ago  ".$hr01.str_repeat(" ", 24 - strlen($hr01))."|\n";
echo "|    2hrs  ago  ".$hr02.str_repeat(" ", 24 - strlen($hr02))."|\n";
echo "|    3hrs  ago  ".$hr03.str_repeat(" ", 24 - strlen($hr03))."|\n";
echo "|    4hrs  ago  ".$hr04.str_repeat(" ", 24 - strlen($hr04))."|\n";
echo "|    5hrs  ago  ".$hr05.str_repeat(" ", 24 - strlen($hr05))."|\n";
echo "|    6hrs  ago  ".$hr06.str_repeat(" ", 24 - strlen($hr06))."|\n";
echo "|   12hrs  ago  ".$hr12.str_repeat(" ", 24 - strlen($hr12))."|\n";
echo "|    1day  ago  ".$day1.str_repeat(" ", 24 - strlen($day1))."|\n";
echo "|    2days ago  ".$day2.str_repeat(" ", 24 - strlen($day2))."|\n";
echo "|    3days ago  ".$day3.str_repeat(" ", 24 - strlen($day3))."|\n";
echo "|    4days ago  ".$day4.str_repeat(" ", 24 - strlen($day4))."|\n";
echo "|    5days ago  ".$day5.str_repeat(" ", 24 - strlen($day5))."|\n";
echo "|    6days ago  ".$day6.str_repeat(" ", 24 - strlen($day6))."|\n";
echo "|    1wk   ago  ".$wk01.str_repeat(" ", 24 - strlen($wk01))."|\n";
echo "|    2wks  ago  ".$wk02.str_repeat(" ", 24 - strlen($wk02))."|\n";
echo "|    3wks  ago  ".$wk03.str_repeat(" ", 24 - strlen($wk03))."|\n";
echo "|    4wks  ago  ".$wk04.str_repeat(" ", 24 - strlen($wk04))."|\n";
echo "|    8wks  ago  ".$wk08.str_repeat(" ", 24 - strlen($wk08))."|\n";
echo "|   16wks  ago  ".$wk16.str_repeat(" ", 24 - strlen($wk16))."|\n";
echo "|   32wks  ago  ".$wk32.str_repeat(" ", 24 - strlen($wk32))."|\n";
echo "|    1yr   ago  ".$yr1.str_repeat(" ", 24 - strlen($yr1))."|\n";
echo "|---------------------------------------/\n";
if (isset($min01blocks)) $min01c = ($blockcount - $min01blocks); else $min01c = 0; echo "| ".fill(number_format($min01c, 0, ".", ","),9)." blocks in last minute\n";
if (isset($min02blocks)) $min02c = ($blockcount - $min02blocks); else $min02c = 0; echo "| ".fill(number_format($min02c, 0, ".", ","),9)." blocks in last 2 mins\n";
if (isset($min03blocks)) $min03c = ($blockcount - $min03blocks); else $min03c = 0; echo "| ".fill(number_format($min03c, 0, ".", ","),9)." blocks in last 3 mins\n";
if (isset($min04blocks)) $min04c = ($blockcount - $min04blocks); else $min04c = 0; echo "| ".fill(number_format($min04c, 0, ".", ","),9)." blocks in last 4 mins\n";
if (isset($min05blocks)) $min05c = ($blockcount - $min05blocks); else $min05c = 0; echo "| ".fill(number_format($min05c, 0, ".", ","),9)." blocks in last 5 mins\n";
if (isset($min10blocks)) $min10c = ($blockcount - $min10blocks); else $min10c = 0; echo "| ".fill(number_format($min10c, 0, ".", ","),9)." blocks in last 10 mins\n";
if (isset($min20blocks)) $min20c = ($blockcount - $min20blocks); else $min20c = 0; echo "| ".fill(number_format($min20c, 0, ".", ","),9)." blocks in last 20 mins\n";
if (isset($min30blocks)) $min30c = ($blockcount - $min30blocks); else $min30c = 0; echo "| ".fill(number_format($min30c, 0, ".", ","),9)." blocks in last 30 mins\n";
if (isset($min40blocks)) $min40c = ($blockcount - $min40blocks); else $min40c = 0; echo "| ".fill(number_format($min40c, 0, ".", ","),9)." blocks in last 40 mins\n";
if (isset($min50blocks)) $min50c = ($blockcount - $min50blocks); else $min50c = 0; echo "| ".fill(number_format($min50c, 0, ".", ","),9)." blocks in last 50 mins\n";
if (isset($hr01blocks)) $hr01c = ($blockcount - $hr01blocks); else $hr01c = 0; echo "| ".fill(number_format($hr01c, 0, ".", ","),9)." blocks in last hour\n";
if (isset($hr02blocks)) $hr02c = ($blockcount - $hr02blocks); else $hr02c = 0; echo "| ".fill(number_format($hr02c, 0, ".", ","),9)." blocks in last 2 hrs";echo "    blocks/hr avg: ".($hr02c / 2)."\n";
if (isset($hr03blocks)) $hr03c = ($blockcount - $hr03blocks); else $hr03c = 0; echo "| ".fill(number_format($hr03c, 0, ".", ","),9)." blocks in last 3 hrs";echo "    blocks/hr avg: ".($hr03c / 3)."\n";
if (isset($hr04blocks)) $hr04c = ($blockcount - $hr04blocks); else $hr04c = 0; echo "| ".fill(number_format($hr04c, 0, ".", ","),9)." blocks in last 4 hrs";echo "    blocks/hr avg: ".($hr04c / 4)."\n";
if (isset($hr05blocks)) $hr05c = ($blockcount - $hr05blocks); else $hr05c = 0; echo "| ".fill(number_format($hr05c, 0, ".", ","),9)." blocks in last 5 hrs";echo "    blocks/hr avg: ".($hr05c / 5)."\n";
if (isset($hr06blocks)) $hr06c = ($blockcount - $hr06blocks); else $hr06c = 0; echo "| ".fill(number_format($hr06c, 0, ".", ","),9)." blocks in last 6 hrs";echo "    blocks/hr avg: ".($hr06c / 6)."\n";
if (isset($hr12blocks)) $hr12c = ($blockcount - $hr12blocks); else $hr12c = 0; echo "| ".fill(number_format($hr12c, 0, ".", ","),9)." blocks in last 12 hrs";echo "   blocks/hr avg: ".($hr12c / 12)."\n";
if (isset($day1blocks)) $day1c = ($blockcount - $day1blocks); else $day1c = 0; echo "| ".fill(number_format($day1c, 0, ".", ","),9)." blocks in last day";echo "      blocks/hr avg: ".($day1c / 24)."\n";
if (isset($day2blocks)) $day2c = ($blockcount - $day2blocks); else $day2c = 0; echo "| ".fill(number_format($day2c, 0, ".", ","),9)." blocks in last 2 days";echo "   blocks/hr avg: ".($day2c / 48)."\n";
if (isset($day3blocks)) $day3c = ($blockcount - $day3blocks); else $day3c = 0; echo "| ".fill(number_format($day3c, 0, ".", ","),9)." blocks in last 3 days";echo "   blocks/hr avg: ".($day3c / 72)."\n";
if (isset($day4blocks)) $day4c = ($blockcount - $day4blocks); else $day4c = 0; echo "| ".fill(number_format($day4c, 0, ".", ","),9)." blocks in last 4 days";echo "   blocks/hr avg: ".($day4c / 96)."\n";
if (isset($day5blocks)) $day5c = ($blockcount - $day5blocks); else $day5c = 0; echo "| ".fill(number_format($day5c, 0, ".", ","),9)." blocks in last 5 days";echo "   blocks/hr avg: ".($day5c / 120)."\n";
if (isset($day6blocks)) $day6c = ($blockcount - $day6blocks); else $day6c = 0; echo "| ".fill(number_format($day6c, 0, ".", ","),9)." blocks in last 6 days";echo "   blocks/hr avg: ".($day6c / 144)."\n";
if (isset($wk01blocks)) $wk01c = ($blockcount - $wk01blocks); else $wk01c = 0; echo "| ".fill(number_format($wk01c, 0, ".", ","),9)." blocks in last week";echo "     blocks/hr avg: ".($wk01c / 168)."\n";
if (isset($wk02blocks)) $wk02c = ($blockcount - $wk02blocks); else $wk02c = 0; echo "| ".fill(number_format($wk02c, 0, ".", ","),9)." blocks in last 2 wks";echo "    blocks/hr avg: ".($wk02c / 336)."\n";
if (isset($wk03blocks)) $wk03c = ($blockcount - $wk03blocks); else $wk03c = 0; echo "| ".fill(number_format($wk03c, 0, ".", ","),9)." blocks in last 3 wks";echo "    blocks/hr avg: ".($wk03c / 504)."\n";
if (isset($wk04blocks)) $wk04c = ($blockcount - $wk04blocks); else $wk04c = 0; echo "| ".fill(number_format($wk04c, 0, ".", ","),9)." blocks in last 4 wks";echo "    blocks/hr avg: ".($wk04c / 672)."\n";
if (isset($wk08blocks)) $wk08c = ($blockcount - $wk08blocks); else $wk08c = 0; echo "| ".fill(number_format($wk08c, 0, ".", ","),9)." blocks in last 8 wks";echo "    blocks/hr avg: ".($wk08c / 1344)."\n";
if (isset($wk16blocks)) $wk16c = ($blockcount - $wk16blocks); else $wk16c = 0; echo "| ".fill(number_format($wk16c, 0, ".", ","),9)." blocks in last 16 wks";echo "   blocks/hr avg: ".($wk16c / 2688)."\n";
if (isset($wk32blocks)) $wk32c = ($blockcount - $wk32blocks); else $wk32c = 0; echo "| ".fill(number_format($wk32c, 0, ".", ","),9)." blocks in last 32 wks";echo "   blocks/hr avg: ".($wk32c / 5376)."\n";
if (isset($yr1blocks)) $yr1c = ($blockcount - $yr1blocks); else $yr1c = 0; echo "| ".fill(number_format($yr1c, 0, ".", ","),9)." blocks in last year";echo "     blocks/hr avg: ".($yr1c / 8760)."\n";
echo "\----------------------------------------";
if (isset($_GET["showallblocks"])) {
echo "\n\n";
foreach ($block as $key => $num) {
$secs = $block[$key] - $block[$key-1];
$secs .= ($secs == 1) ? " second " : " seconds";
$secs = str_repeat(" ", 14 - strlen($secs)).$secs;
if (isset($block[$key-1])) echo "$secs to find block $key\n";
else echo "  unknown time to find block $key\n";
}
} else {
echo "\\\n   <a href=\"$PHP_SELF?showallblocks\">Timestamp data for all ".number_format($blockcount)." blocks</a>  |\n";
echo "                 ~".number_format(filesize($blockfile) * 1.23175 / 1024 / 1024, 2)."Mb                 |\n";
echo "-----------------------------------------/";
}
function fill($str, $len) { return str_repeat(" ", $len - strlen($str)).$str; }
?>
 </pre></body>
</html>

Additionally, "blockdata" is updated every minute using a cron script written in python.  This python code populates "blockdata" with "<blocknum> <timestamp> <avghashes>"
courtesy of ArtForz

getblockdata.py
Code:
#!/usr/bin/env python
import struct
import hashlib

def uint256_deser(s):
r = 0L
for i in xrange(8):
t = struct.unpack("<I", s[i*4:i*4+4])[0]
r += t << (i * 32)
return r

def uint256_ser(u):
rs = ""
for i in xrange(8):
rs += struct.pack("<I", u & 0xFFFFFFFFL)
u >>= 32
return rs

def uint256_from_compact(c):
nbytes = (c >> 24) & 0xFF
v = (c & 0xFFFFFFL) << (8 * (nbytes - 3))
return v

def get_difficulty(c):
return float(uint256_from_compact(0x1D00FFFF) * 1000 // uint256_from_compact(c)) / 1000.

class CBlock:
def deserialize(self, s):
self.nVersion = struct.unpack("<i", s[0:4])[0]
self.hashPrevBlock = uint256_deser(s[4:36])
self.hashMerkleRoot = uint256_deser(s[36:68])
self.nTime = struct.unpack("<I", s[68:72])[0]
self.nBits = struct.unpack("<I", s[72:76])[0]
self.nNonce = struct.unpack("<I", s[76:80])[0]
h1 = hashlib.sha256(s[0:80]).digest()
self.hash = uint256_deser(hashlib.sha256(h1).digest())
if self.hash > uint256_from_compact(self.nBits):
raise ValueError("bad hash in %s" % repr(self))
self.next = []
self.blocknum = -1
def __repr__(self):
return "CBlock{ver=%08x hp=%064x hm=%064x nt=%08x nb=%08x nn=%08x h=%064x, n=%i}" % (self.nVersion, self.hashPrevBlock, self.hashMerkleRoot, self.nTime, self.nBits, self.nNonce, self.hash, self.blocknum)

def get_chain_len(blk):
r = 1
while len(blk.next) == 1:
blk = blk.next[0]
r += 1
if len(blk.next) > 1:
bestchainlen = 0
for nextblk in blk.next:
chainlen = get_chain_len(nextblk)
if chainlen > bestchainlen:
bestchainlen = chainlen
r += bestchainlen
return r


def readblocks(filename):
f = open(filename, "rb")
blocks = []
idxmap = {}
while True:
try:
magic = f.read(4)
if magic != "\xf9\xbe\xb4\xd9":
break
blklen = struct.unpack("<i", f.read(4))[0]
if blklen < 80:
break
blkdata = f.read(blklen)
if len(blkdata) != blklen:
break
except:
break
blk = CBlock()
blk.deserialize(blkdata)
blocks.append(blk)
idxmap[blk.hash] = blk
if blk.hashPrevBlock:
prevblk = idxmap[blk.hashPrevBlock]
blk.prev = prevblk
prevblk.next.append(blk)
f.close()
rootblk = blocks[0]
del blocks
del idxmap
blk = rootblk
curblkidx = 0
while True:
blk.blocknum = curblkidx
if len(blk.next) == 0:
blk.next = None
break
if len(blk.next) > 1:
bestnextblk = None
bestchainlen = 0
for nextblk in blk.next:
chainlen = get_chain_len(nextblk)
if chainlen > bestchainlen:
bestchainlen = chainlen
bestnextblk = nextblk
elif chainlen == bestchainlen:
if nextblk.nTime < bestnextblk.nTime:
bestchainlen = chainlen
bestnextblk = nextblk
blk.next = [bestnextblk]
blk.next = blk.next[0]
curblkidx += 1
blk = blk.next

blk = rootblk
while blk:
#print "%i %i %.3f 0x%08X" % (blk.blocknum, blk.nTime, get_difficulty(blk.nBits), blk.nBits)
avghashes = 2**256 / uint256_from_compact(blk.nBits)
print "%i %i %i" % (blk.blocknum, blk.nTime, avghashes)
blk = blk.next

if __name__ == "__main__":
print readblocks("/path/to/blk0001.dat")

line for cron
Code:
*/1     *       *       *       *       /path/to/getblockdata.py > /path/to/blockdata
1147  Bitcoin / Bitcoin Discussion / Seeking Funding or Hosting on: July 15, 2010, 05:48:07 AM
I'm recently unemployed and have since established much interest in Bitcoin community as well as contributing developmental aspects towards some related things, but I need a job to survive/support myself.  Is anyone hiring?  :3
1148  Bitcoin / Bitcoin Discussion / Re: Flood attack 0.00000001 BC on: July 15, 2010, 05:41:07 AM
From the source code:
Code:
main.h:        // To limit dust spam, require a 0.01 fee if any output is less than 0.01


I added this little tidbit into my IRC bot:

According to http://is.gd/dsqcH the world population is 6,855,986,675. If everyone had the same amount of bitcoins, everyone would have 0.00306302 bitcoins.  If 0.00000001 bitcoins were equivalent to US$0.01, then everyone would have equivalent of US$3,063.01645489 and the value of all bitcoins would be equivalent of US$21,000,000,000,000.00.

How would the BTC0.01 fee affect things considering above?
1149  Bitcoin / Bitcoin Discussion / Re: Official Bitcoin Unicode Character? on: July 15, 2010, 05:16:30 AM
A B with two lines through it without the circle may be a bit confusing or too similar to the Thai currency considering the US$ symbol is sometimes used with one or two lines.  So additionally a circle around it like the icon used with the client and also the favicon used at this site seems like a good idea.
1150  Bitcoin / Bitcoin Discussion / Re: Lost all my Bitcoins? on: July 15, 2010, 03:45:26 AM
A tiny bit now, but in a couple years?  Here's a snippet from my IRC bot.
According to http://www.census.gov/main/www/popclock.html the world population is 6,855,970,029. If everyone had the same amount of bitcoins, everyone would have 0.00306302 bitcoins.  If 0.00000001 bitcoins were equivalent to US$0.01, then everyone would have equivalent of US$3,063.02389176 and the value of all bitcoins would be equivalent of US$21,000,000,000,000.00.
1151  Bitcoin / Bitcoin Discussion / Official Bitcoin Unicode Character? on: July 15, 2010, 03:02:28 AM
I suggest a character representative of symbol for Bitcoin currency be submitted to http://unicode.org/pending/proposals.html

฿ doesn't seem to be worthy considering it already is well established as Thai baht (currency).
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