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Blockchain and Data Security

In our daily lives, on social media, in every moment of our lives, we actually share our data with third parties, knowingly or unknowingly. So, is this data really protected?

This topic is starting to get annoying in many ways. We see advertisements from YouTube videos we watch, even from the ones we like on Instagram. The advertisements we come across while surfing the internet are always made up of sentences based on our interests or the words we search for. So what does this tell us? In short, because our data is shared with third parties. According to our Constitution, which considers and protects the privacy of citizens as a fundamental right, it allows everyone to seek their rights. If you see that your data has been stolen, you should go to court and seek your rights without hesitation. Keeping our private life private has become much more important, especially recently. In e-commerce applications, we see that all of us have registered credit-debit cards that there are serious problems in this regard, and that our card information is stolen. One of the main problems here is that our information is stored in a “central” place. Stealing our data in one place actually makes the job of malicious hackers easier.

Blockchain technology is developing day by day and continues to get stronger in terms of reliability. With the distributed record mechanism, everything recorded is not in a single center, but in everyone in the network. Because information is not in one place, it is almost impossible to steal, change, or delete data. When any data is processed with the blockchain, it is converted into a 256-bit number called a hash. In other words, every time we enter this number, there is only one result that comes up. Since this whole number cannot be changed, it is impossible to change the processed data. According to Article 4/1 of the General Data Protection Regulation; Personal data means any information belonging to a specific or identifiable natural person. Depending on the use case of a Blockchain, the data stored in blocks may be data of an identified or identifiable natural person. According to the General Data Protection Regulation, data controller means a natural or legal person, public authority, institution, or other public institution that determines the purposes and means of processing personal data, either alone or jointly with others. Who can be the data controller in the blockchain system, whether all the actors in the blockchain can be considered as data controllers, and which category the miners can be put into should be evaluated. In addition, the personal data nature of hash values, and public and private keys is another issue that needs to be evaluated. **Bilal Toprak

At this point, an infrastructure can be created with the opportunities provided by blockchain technology in terms of protecting our data. It is an undeniable fact that the system we call distributed ledger offers us instead of storing data in a central place.