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Ignore the Bitcoin reference, you will merely get sidetracked into arguing about whether crypto-currency has any real value. What happens in a blockchain is that a set of data is broken down into chunks. Those chunks are then stored on a series of computers each of which hold a 'block' of data space. But the chunks are duplicated and held on more than one computer. Each chunk of date has a unique reference which allows it to relate to the other chunks of data. That means that (unless you are the owner of the data with the necessary key) in order to modify the data you would have to have the references of every single chunk of data on every computer where it is stored in order to be able to locate it. Imagine breaking a contract for sale of shares into a lot of half sentences and distibuting the storage of those half sentences around a large number of computers several times. If you wanted to hack the contract to show that the sale was to you instead of the proper owner you would have to find every half sentence on every computer and then get the computers to send all the data to one place to print out if you wanted to produce it as evidence. This is what makes blockchain technology very secure. In reality the only people who would have access are the parties to the transaction who hold the necessary 'key'. Of course if you lose the key then you are vulnerable but that that is nothing to do with the security of the technology itself. Which is also fast and operates in real time between the parties without needing intermediaries such as a central registry.

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