The advantages of bitcoin such as immutability and decentralization, can create problems for this cryptocurrency.

A team of researchers analyzed stored in the blockchain 1600 files and found the pornographic images and links to videos of child pornography. Thus, all who adopt a full node Bitcoin automatically entitled to become owners of illegal content.

In blockchain, except for the information about the transaction can also store small notes or files. For example, the first block in the Bitcoin chain contains a text message left by its Creator Satoshi Nakamoto: “The Times 03/Jan/2009 Chancellor on brink of second bailout for banks“. This article title on the front page of the British newspaper The Times released on the same day — January 3, 2009.

So Satoshi Nakamoto wanted to confirm the actual date of the launch of Bitcoin, and possibly to hint at the problems in the banking sector, which should come decentralized cryptocurrency. Similarly, did the people who posted on the blockchain links and photographs of illegal content is the only purpose of them is not as clear and sublime.

In the study entitled “Quantitative analysis of the effect of an arbitrary block content on the bitcoin” a team from the University in Aachen (Germany) tells about at least 8 found the pornographic materials, including one supposedly with a scene of child abuse. Two more file 274 contain links to other sites with similar content, and 142 of them lead to pages on the darknet. The result of this discovery, the bitcoin may become illegal in most countries and jeopardize the entire cryptocurrency industry.

The document lists other types of content, the distribution of which may also violate the laws of some States that material that violates copyright law affect the privacy of some individuals, are politically sensitive content and even contain old malware.

Of course, the Internet is also a lot of illegal content, but that the Internet worked, you don’t need to store this content on your computer. Although ordinary users can easily use real money with the so-called “light wallet”, which do not require downloading the entire blockchain to your computer, but if any prohibitive measures are still to be developed, it will affect miners and people who work full-Noda. And without them, bitcoin can not exist.

It is worth noting that programmers and regulators have long discussed the possibility of placing such files in the blockchain. Former Bitcoin Core developer Jeff garzik’s in April 2013 in his blog called such a scenario “a terrible situation” that “difficult to solve”. And in March 2015, the Interpol has warned about the possibility of using the blockchain to store malware or images of a pornographic nature. But as far as we know, has still not found a working solution to this problem.

However, some experts believe that the problem is with the storage of the unwanted files in the blockchain far-fetched. The fact is that even if you download the entire Bitcoin blockchain, you will not find the aforementioned phrase Satoshi Nakamoto. Instead, you find the hash, which includes transaction data and a text message. It looks like this:

000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f

This option is coinbase of the block (not to be confused with the exchange Coinbase), written in hexadecimal format. The amount of data here does not exceed 100 bytes, and add the data may only miners. There are five ways to enter information in the block, but the size of these files may be less than 100 bytes. Thus, saying that the Bitcoin blockchain contains pornography, we are only talking about the links to these videos. And to the person who originally uploaded the blockchain to find these links, you will have to do a long procedure with a transcript and checking all the addresses. Thus similarly, you can insert the coded link within any database, including Facebook, Amazon or Wikipedia.