In a blockchain digital records unite in “blocks” which communicate then cryptographic and chronologically in “chain” by means of difficult mathematical algorithms. Each block is connected with previous and comprises a set of records. New blocks are always added strictly to the end of a chain.
The enciphering process known as hashing is carried out by a large number of the different computers working in one network. If as a result of their calculations all of them receive the identical result, then the unique digital signature (signature) is appropriated to the block. As soon as the register is updated and educated the new block, he already can’t be changed anymore. Thus it is impossible to forge it. To him, it is possible to add new entries only. It is also important to consider that the register is updated on all computers in the network at the same time.
The distributed nature of databases of Blockchain makes breaking by hackers almost impossible as for this purpose they need to get at the same time access to copies of the database on all computers in the network. The technology also allows securing personal data as hashing process irreversible. Even if the original document or transaction will be changed further, as a result, they will receive other digital signature that signals about the discrepancy in the system.