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The genesis block is the first block on the Bitcoin blockchain. One of the most important features of the blockchain is its immutability. This makes Bitcoin blocks rare durable binary artifacts. This is what makes it almost bitcoin blockchain parser code to counterfeit Bitcoins. Bitcoins have been lost bitcoin blockchain parser code stolen but they have never been successfully counterfeited.

This sharply contrasts with funny money like the US dollar that is so routinely and brazenly counterfeited that many suspect the US government turns a blind eye. The exceptional durability of Bitcoin blocks, coupled with the mysterious origins of Bitcoin, makes the genesis block one of the most intriguing and important byte runs in the world. This post was inspired by the now defunct post bytes that changed the world.

I would love to give you a link but this post has vanished. When programmers start exploring Bitcoin they often cut their teeth on parsing the genesis block. What you will not find, until now, are J examples.

So what does J bring to the table that makes yet another genesis block parser worth a look? Feel free to send as many Satoshis and full Bitcoins as you like to this address. So, what is this number in standard format?

The second line that defines dfb58decimal from base 58is the complete J program! Suppose you wanted to convert ten thousand Bitcoin addresses. The following converts ten thousand copies of tip.

Public keys take a number of forms in the blockchain. The ChallengeScript noun holds the bytes given in bitcoin blockchain parser code above. The following J verb ParseGenesisBlock bitcoin blockchain parser code the first full node Bitcoin block file and then extracts and checks the genesis block.

If this post peeks your curiosity about J a good place to start bitcoin blockchain parser code about the language is the recently released New Dictionary of J. Post was not sent - check your email addresses! Sorry, your blog cannot share posts by email.

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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.