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I'm a freshman of bitcoin system and I'm trying to find out how to use bitcoin parser. I downloaded several from internet but they were not work out. Currently I am using Bitcoin Knots wallet and downloaded all blockchains (approx.223GB). I know those data are preserved in the file names blockchain and they are in the form like blk0xxxx.dat. But how to parse those files? I really want to know the answer!
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But how to parse those files?
It is not too difficult to parse bitcoin blockchain if you have programming skills and know what you want to do. Have a look to my piece of code - this is just a working example that parsing is easy. Of course, you have to write code in your favorite language for your task
#include <QTimer>
#include "BlockChain.h"
#include "Util.h"
#include "MyByteArray.h"
#include "Target.h"
BlockChain::BlockChain ( QObject* parent ) : QFile ( parent ), blkFile ( START_BLOCK )
{
connect ( this, SIGNAL ( block ( const QByteArray& ) ), parent, SLOT ( block ( const QByteArray& ) ) );
connect ( this, SIGNAL ( doneFile ( ) ), parent, SLOT ( doneFile ( ) ) );
QTimer::singleShot ( 0, this, SLOT ( start ( ) ) );
}
void BlockChain::start ( )
{
setFileName ( blkFileName ( blkFile++ ) );
if ( !open ( QIODevice::ReadOnly ) )
{
_trace ( QString ( "cant open [%1]" ).arg ( fileName ( ) ) )
emit block ( QByteArray ( ) );
deleteLater ( );
}
else
{
_trace ( QString ( "processing [%1]" ).arg ( fileName ( ) ) )
QTimer::singleShot ( 0, this, SLOT ( next ( ) ) );
}
}
void BlockChain::next ( )
{
if ( pos ( ) < size ( ) )
{
quint32 magic;
quint32 sz ( read ( (char*)&magic, 4 ) );
while ( !magic && pos ( ) < size ( ) - 4 )
read ( (char*)&magic, 4 );
xassert ( ( ( magic == MAGIC_ID ) || !magic ) && ( sz == 4 ) )
if ( magic )
{
read ( (char*)&sz, 4 );
emit block ( read ( sz ) );
QTimer::singleShot ( 0, this, SLOT ( next ( ) ) );
return;
}
}
close ( );
emit doneFile ( );
QTimer::singleShot ( 0, this, SLOT ( start ( ) ) );
}
const QString BlockChain::blkFileName ( const int i ) const
{
return
( i < 10 ) ? QString ( DATA_ROOT "\\blk0000%1.dat" ).arg ( i ) :
( i < 100 ) ? QString ( DATA_ROOT "\\blk000%1.dat" ).arg ( i ) :
( i < 1000 ) ? QString ( DATA_ROOT "\\blk00%1.dat" ).arg ( i ) :
QString ( DATA_ROOT "\\blk0%1.dat" ).arg ( i );
}
0
The easiest way to parse the blockchain is to use the built-in JSON-RPC API instead of trying to get data directly from blk*.dat files. The official documentation is available here: https://bitcoin.org/en/developer-reference#bitcoin-core-apis
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The easiest way is to use my simple python script (blockchain parser) that can parse whole raw data from the blk*****.dat files into the human readable text view. This script is very simple to understand and it would be the best way to find out what hiding behind the blockchain database.
