02/10/2022
Digital currencies are the future. Do you know what blockchain is?
Blockchain (English blockchain [1], originally block chain [2] - a chain of blocks) - a continuous sequential chain of blocks (linked list) built according to certain rules containing information. The connection between blocks is provided not only by numbering, but also by the fact that each block contains its own hash sum and the hash sum of the previous block. Changing any information in a block will change its hash sum. To comply with the rules for building a chain, changes in the hash sum will need to be written to the next block, which will cause changes to its own hash sum. In this case, the previous blocks are not affected. If the block being modified is the last one in the chain, then making changes may not require significant effort. But if a continuation has already been formed after the block being changed, then the change can be an extremely time-consuming process. The fact is that usually copies of block chains are stored on many different computers independently of each other.