Bitcoin blockchain parser

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Each of them is built according to a special structure in order to store information about all payments transactions , both outgoing and incoming. Without going into finite detail of the blockchain technology structure, it can be described as a giant electronic registry that contains information about every wallet address and every transaction made since the creation of bitcoin.

Every single day more than several thousands of transactions are made within the Bitcoin blockchain. The blockchain is used to process huge volumes of information. Big transactions exceeding BTC are made pretty often. It's worth noting that BTC is equal to almost two millions of dollars price for September By obtaining information about these transactions in a timely manner, one can estimate the overall mood of the network and especially of big holders owning large BTC deposits.

Special parsing bots are used to process information from the blockchain. BTCparser1, BTCparser2, and BTCparser3 are not trading assistants and were made to collect and calculate an additional statistical information on a timely manner. Contacts: For any inquiries please contact us using the following e-mail web[NoSpam]btcparser.

If there are errors, it is fine to create the JSON file or not — it will not be checked. The format of this file is described below. The Bitcoin block format that is being parsed for this assignment is the initial format of the blockchain — specifically before any BIPs were proposed and enacted. Thus, the blocks will not contain fields such as the height number. Furthermore, the blocks use regular Merkle Trees and not Fast Merkle Trees which were proposed later.

You will need to be familiar with the Bitcoin slide set , specifically the first four sections: on Merkle trees , data types used , Bitcoin concepts and terminology , and the blockchain description. Changelog Any changes to this page will be put here for easy reference. Typo fixes and minor clarifications are not listed here. In practice, though, it needs to be a language that the auto-graders can compile and run, and that the skeleton code is written for.

You will have to let us know at least two days before the submission deadline so that we can configure it in time. This assignment specifically is intended for you to use packages that handle the JSON processing for your programming language. In particular, you may NOT use any cryptocurrency specific libraries such as the Bitcoin libraries. However, you are welcome to — and probably should — use any JSON libraries.

Python: To output JSON in Python, you create a dictionary with nested dictionaries and lists, as necessary , and then use the json library included with Python to output the JSON; see here for a tutorial. Java: In Java, a number of tutorials 1 , 2 , 3 , etc. Version 1. To use it you will need to update your classpath on both the compilation javac -cp json-simple BTCParse ; these updates will have to be made to the Makefile and parse. The first of those tutorials this one has example code that outputs in JSON using this library.

Provided files We have a number of files of the blockchain itself. Blockchain block counting is indexed from 0 the genesis block , so a file that contains the first 10 blocks will contain blocks Note that not all of the files below contain the genesis block!

Files with multiple blocks blkf For the second line, replace. Once created, you will have to ensure it can be executed: chmod parse. You should then be able to run your program via:. The following might be what it would look like for Python:! Otherwise it will not work. And for Java:! If so, your parse. For languages that do not need compilation such as Python , just put in a single echo statement so that make still runs properly.

This is the same as in the previous assignments md. Part 1: Parsing Your program will take in exactly one command-line parameter: the file to read in. You can assume that there will always be one command line parameter provided, and that that file will exist. Sample files are provided above — both large and small. Block group file format The blocks to be verified are grouped together in a file — this file is from the Bitcoin system, and if you were to launch a Bitcoin node and have it sync the blockchain, you would have those files on your machine as well.

The largest file we provide contains block 0 the genesis block through block , Make sure you use the -C parameter! This will print a LOT of text, so we will pipe it through head, as shown below. Each block is preceded by 8 bytes of data. The first 4 bytes are the magic number, and the second four bytes are the block size. Both are in little-Endian format in the file. Each line displays 16 bytes from the file.

The columns in hexdump shows the address of the first byte in the row in hex , the hex values of the 16 bytes, and an ASCII representation of those 16 bytes if they are printable characters; a period is used if they are not printable characters. You may want to save the hexdump output to a file hexdump -C blk If you do this with some of the larger blockchain files, be aware that the hexdump output can be quite large — up to Mb for the largest file we provide in this assignment.

The value is 0xd9b4bef9, or 0xf9beb4d9 in little-Endian. The next four bytes 1d 01 00 00 are the size. The next bytes are the contents of block 0 the genesis block. On the second line, the magic number f9 be b4 d9 of the second block block index 1 starts on the 6th byte. Reading in the blockchain Your task is to read in the blockchain. The format for the blockchain can be found in the Bitcoin lecture slides , specifically starting here. You will need to read in the file in binary format.

You will likely want to print out the data read in and the associated fields. This will be changed to a different output format in part 3, below. As you are printing out the values, you can see what they should be here for block 0; the output is also shown below.

That site prints the values in big-Endian, which is how we will be printing them in this assignment. However, we are going to print out the nBits field in hex; that site prints it out in decimal. Some useful hints: There really are only five different types in the bitcoin blockchain: 4-byte unsigned integers, 8-byte unsigned integers, compactSize unsigned integers, byte hashes, and variable-length scripts.

All of the blockchain is one of these five types — so you can reuse your code from reading in one type to read in another value of that type. While there are only 5 types, we will be outputting them in different ways — but each programming language can easily print a number in hex or decimal.

Make sure you have a method that reads in compactSize unsigned integers properly, as this will cause your program to crash otherwise. In particular, remember that if the variable is more than one byte, then all the bytes other than the first are in little-Endian format.

Part 2a: Validation Now that you can read in valid blockchain, your program should be extended to check for errors in the blockchain. Once an error is encountered, the program should output the error number and exit.

The errors below are what should be checked for — note that these are not all the possible errors, but a selection of errors to check for in this assignment. If there are multiple errors, you should report the one found in the earlier block and then exit. For example, if there is a modification to the Merkle hash in block 10, then both block 10 will have an error 6 — bad Merkle hash as well as block 11 3 — bad previous header hash.

In this case, the error in block 10 should be reported, and the program should then exit. If there are multiple errors in a single block, you can report any one of them and then exit.