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This article will discuss the version of blockchain technology that is used for Bitcoin cryptocurrency. I consider the Bitcoin technology itself revolutionary. Unfortunately, Bitcoin has been used for criminal activities far too often, and as an information security specialist, I strongly dislike that practice. Yet, technologically speaking, Bitcoin is an obvious breakthrough. Since then, for almost nine years, only one critical vulnerability has been found in its implementation, when one malefactor snagged 92 billion bitcoins.
Fixing that required rolling back the entire financial record by 24 hours. Nevertheless, just one vulnerability in nine years is praiseworthy. Hats off to the creators. The authors of Bitcoin faced the challenge of making it all work with no central system and no one trusting anyone else.
The creators rose to the challenge and made electronic money an operational currency. Nevertheless, some of their decisions were devastating in their ineffectiveness. I am not here to discredit blockchain, a useful technology that has shown many remarkable uses. Despite its disadvantages, it has unique advantages as well. However, in the pursuit of the sensational and revolutionary, many people concentrate on the upsides of the technology, often forgetting to take a sober view of things, thus disregarding all of its downsides.
It is for this reason, for the sake of diversity, that I deem it useful to focus on the disadvantages of the technology. A book that expresses high hopes for the blockchain. Quotes from this book appear throughout this article. You might have supposed that nodes across the world gather something bigger bit by bit. That is totally incorrect. In fact, all of the nodes that maintain the blockchain do exactly the same thing. Here is what millions of computers do:.
There is no paralleling, no synergy, and no mutual assistance. There is only instant, millionfold duplication. Every high-grade Bitcoin network client stores the entire transaction history, and this record has already become as large as GB.
The more transactions processed on the Bitcoin network, the faster the size grows. And the greatest bulk of it has appeared over the past couple of years. The growth of the blockchain. The growth of HDD capacity definitely lags behind. In addition to the need to store a large chunk of data, the data has to be downloaded as well. Anyone who has ever tried to use a locally stored wallet for cryptocurrency discovered with amazement and dismay that he or she could not make or receive payments until the entire download and verification process was complete — a few days if you were lucky.
Sure, it would be more efficient. Second, clients would then have to trust servers. For example, this could be done in the case of post-stroke memory restoration. If each network node does the same thing, then obviously, the bandwidth of the entire network is the same as the bandwidth of one network node.
But do you know exactly what that is? The Bitcoin network is capable of processing a maximum of seven transactions per second — for the millions of users worldwide. Aside from that, Bitcoin-blockchain transactions are recorded only once every 10 minutes. To increase payments security, it is standard practice to wait 50 minutes more after each new record appears because the records regularly roll back. Now imagine trying to buy a snack using bitcoins. If you consider the entire world, that sounds ludicrous even now, when Bitcoin is used by just one in every thousand people on the planet.
For comparison, Visa processes thousands of transactions per second and, if required, can easily increase its bandwidth. After all, classic banking technologies are scalable. You have certainly heard of miners and giant mining farms built next to power stations. What do they actually do?