Block Parsers: How to Read the Bitcoin Block Chain

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We copy the bytestring so that the stream can be garbage collected later "fromByteString" copies from the ByteString to the ForeignPtr - actually I think two bitcoin blockchain parser returned Get Maybe Word32 Source. Get Either Int Int Source. Get Maybe Word32Word64 Source.

Unfortunately, it can happen in practice that the chunk length is completely wrong In that case we have to parse the block to find the correct size because the next block will start within this block Returns the position, the block size which usually equals the chunk size, but not always unfortunately, which complicates the parsing considerably In the case they are invalid, we also parse the full block, and consume the block, not the chunksince the chunk size can be invalid in same cases Get [ Word64BlockHeader ] Source.

Source Contents Index bitcoin-hs Partial implementation of the Bitcoin protocol as of Get Maybe Word32 skipZeroBytes:: Get [ Word64BlockHeader ]. Input is a strict ByteString. Input is a lazy ByteString. Get Hash Source Note: Word32 Source The magic word in big-endian. Word32 Source The magic word bitcoin blockchain parser returned little-endian. Get Either Int Int Source returns the number of zero bytes which were skipped Left if the input ends.

Get Maybe Word32Word64 Source returns the next found "magic bytes" which may be invalid and their position, unless the file bitcoin blockchain parser returned. But bitcoin blockchain parser returned we don't want to always parse the block when it is unnecessary Get ByteString Source Note: Get Maybe Word64IntBlock Tx RawScript RawScript Source Returns the position, the block size which usually equals the chunk size, but not always unfortunately, which complicates the parsing considerably Produced by Haddock version 2.

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Last week I spent some time on collecting certain statistics e. The hardest part for me was to pick the right tool to parse the raw blockchain data. Unfortunately, the returned results bitcointools , blockchain , blockparser , etc. Next, I checked some papers on Google Scholars to find out how other people solved the problem.

A paper leaded me to BitcoinArmory project, which requires a dozen of manual interventions to get installed. I did not even attempt to install it. It has a rich documentation, developer-friendly and fully documented API and works out of the box.

It is composed of a single JAR, no other requirements, stupid hassles, etc. In addition, its IRC channel at FreeNode is packed with real people that provide instant support on any Bitcoin related questions.

Enough with the talk! I first included the bitcoinj Maven dependency in my pom. Here comes the simplest part: Below, I calculate the average number of transactions per block per month.

In order to appreciate the hassle-free simplicity of the bitcoinj interface, you ought to take your time and spend a couple of hours on other tools first. About the performance, for the sample blockchain dataset of size 4. Sample data composed of blocks MB From the genesis block through height , 4. Block ; import com. NetworkParameters ; import com. PrunedException ; import com. Transaction ; import com. MainNetParams ; import com.

BlockStoreException ; import java. File ; import java. ArrayList ; import java. HashMap ; import java. List ; import java.