Today it is already difficult to find people who have not heard anything about bitcoin. But those who understand bitcoin technology and understand how this cryptocurrency works are still few. And if we don't understand something, we are afraid of it and don't trust it. That's the way we are. We ourselves, professional investors, have gone from misunderstanding and complete denial of bitcoin to including cryptocurrencies in our calculations and savings. And this path began with the study of the technical foundations of the blockchain. There are a lot of articles on this topic, but, unfortunately, they either boil down to a primitive picture with a chain, or they are too complex and abound in a lot of technical terms.
The purpose of this article is to convey in simple language the complex mechanisms embedded inside the blockchain and show how bitcoin works not at a primitive level, but including the key nuances that make the work of this network brilliant.
Bitcoin blockchain and Bitcoin cryptocurrency
Let's start with the separation of concepts. If we see that Bitcoin is written with a capital letter, then we are talking about the blockchain network of the same name, and if with a lowercase letter, then we are talking about cryptocurrency. In general, these concepts are inextricably linked, since bitcoin exists only inside the blockchain and, at the same time, the Bitcoin blockchain is created for the functioning of this currency and without it loses its meaning.
Why is Bitcoin needed and where did it come from
Bitcoin appeared in 2009. Its creator is Satoshi Nakamoto. There is a legend that he is the largest holder of bitcoin. Bitcoin appeared not just as an alternative to modern currencies, but as an alternative to the entire financial system. Why did you need an alternative? The thing is that modern money often does not cope with its functions perfectly. Bitcoin was designed and developed to eliminate these gaps.
Read more: Who is Satoshi Nakamoto
How Bitcoin solves the problems of modern money
The first and main problem of modern money is the need to trust the issuer, that is, the Central Bank. Since all modern money has no intrinsic value. A couple of hundred years ago, for example, money was gold or silver, and there was a certain sense in this, since the metal was valuable in itself. Today, any money is just ordinary pieces of paper or, moreover, only numbers on virtual accounts. And the issuer gives them value. The stronger and more economically developed a state prints money, the more significant it is.
However, this is all conditional. And any Central Bank that we should trust, of course, can undermine this trust. So, in 2020, all the central banks of the largest developed countries of the world (the Fed, the ECB, the Bank of Japan and others) allowed "damage to the coin", starting to "print" money in trillions. As a result, these actions led to inflation and depreciation of all currencies, even those where inflation has traditionally been at a low level. And in 2022, the US Federal Reserve, the ECB and the Bank of Japan froze the reserves of the Central Bank of the Russian Federation, undermining confidence in both the institute of international law and the entire traditional financial system.
But that's not all. In addition to central banks, other institutions are creating a modern financial system, without which the circulation of modern money would not work.
For example, these are banks, as well as payment systems – Mastercard, Visa. But here, too, problems await us: banks may go bankrupt, as a result of which customers may lose money, and Master Card and Visa, for example, in 2022, took and "banned" the whole country, depriving millions of Russians of access to their own money abroad.
Does such a system inspire confidence? Definitely not. And if in 2009 the words of bitcoin founder Satoshi Nakomoto sounded like the words of a dissident challenging the established world order, today they sound quite true and even in a sense like a prediction. If something can break (a centralized system based on trust in one center – the Central Bank), then it will definitely break (there will be a situation when this center will violate the rule of the game to please itself).
Read more: What is Satoshi - explanation in simple words
How does Bitcoin solve these problems?
The fact is that bitcoin was originally conceived as a digital and decentralized currency. That is, no one controls it, and no one can control it (as it turns out, we will analyze it later, while we accept it as a fact). The bitcoin program code does not have a single control and management center. It is hosted simultaneously on thousands of computers connected to a network, and stability is ensured by the algorithm of the blockchain itself, which cannot be hacked by a reliable SHA-256 encryption system and decentralization. The most important consequence of this is that bitcoins cannot be blocked.
For bitcoin to work, you don't need banks that can go bankrupt or somehow appropriate your funds. The Bitcoin network does not need intermediaries. All transactions are secured and confirmed by a network of miners who have clear economic incentives to work. It is unprofitable to sabotage payments to miners - another one will immediately come in his place for a reward. At the same time, the mining economy is designed so that the capture of all mining in one hand is super-expensive and will never pay off. Therefore, the system will always remain decentralized and in the condition of economic equilibrium. We will also tell you more about mining a little later.
Protection against inflation and "damage to the coin" is that the issue of bitcoin is physically limited by the bitcoin algorithm. In the table below, we have brought together the problems of the old financial system and how bitcoin copes with these challenges.
How the blockchain works
As we have already discussed above, the main problem of modern money is a question of trust. And this problem arises at all levels: from the level of transaction between individuals, to the level of central banks. At the same time, whole bulky structures and numerous intermediary institutions are being created in order to increase the degree of trust and reduce risks. So, for example, at the individual level, in order to elementary confirm the transaction, humanity came up with checks, invoices, acts of work performed, receipts and many more forms of various documents. Entire departments are engaged in the creation and accounting of these documents and operations in organizations: accounting, treasury, etc. And all just to solve the issue of trust.
In the blockchain, the issue of trust is resolved at the level of the program code once and for all.
Read more: Blockchain technology: how it works and where it is used
How the Bitcoin blockchain works
The Bitcoin blockchain is designed in such a way that each transaction is recorded in a special program log, and a copy of this log with all records is stored simultaneously in thousands of data centers. Thus, it is simply impossible to fake anything. After all, if someone decides to forge a record on their computer, then there will be no record in other storage locations and the transaction will not pass verification.
Where are all these transactions stored and who carries them out? In order to conduct a transaction, you need a computer, and in order to provide decentralized data storage, you need a lot of independent computers. This task is carried out by the so-called miners.
What is mining
Approximately every 10 minutes in the Bitcoin blockchain network, all transactions are collected in special blocks and sent for processing and confirmation. Miners check transactions as follows: whether the sender has the right amount of bitcoins, whether the block chain is intact and intact, and only after that they carry out transactions. At the same time, during the transaction, a new block is registered on the computers of all miners in the blockchain chain with operations. To date, there are more than 15,800 miner nodes in the blockchain network (a node is any computer connected to the blockchain network or a node of an entire network of computers connected to the blockchain). The actual number of nodes can be viewed on a specialized website).
Why do miners do this work? After all, quite powerful and expensive equipment is needed to store the blockchain chain and conduct operations, as well as significant energy costs. The fact is that for conducting transactions, the miner who recorded a new block receives a reward in the form of a commission from users, as well as in the form of newly created bitcoins (currently, the reward is 6.75 bitcoins for 10 minutes). At the same time, every 4 years the remuneration is reduced by 2 times (the next division by 2 times will be in July 2024). At the same time, the reward in the form of new bitcoins for miners will cease to be accrued at all in 2140. The total number of all bitcoins is limited to the figure of 21,000,000 bitcoins. According to expert estimates, the last bitcoin will be created in 2140. By this time, only the commission will remain as a reward for miners. It is assumed that with the increase in the number of users of the system, the amount of the total commission fee will grow and the increase in the form of new bitcoins, necessary at the dawn of the existence of the blockchain, will no longer be so necessary. The limited size of the issue makes bitcoin anti-inflationary money.
Perhaps you have a question: does each miner receive 6.75 bitcoins plus commission? That's a lot of money today! In fact, not every miner receives such a reward, but only the one who won a certain competition to solve a complex cryptographic problem. It takes about 10 minutes to solve such a problem, even on the most modern equipment. Moreover, if the capacity increases, the task will become more complicated. And the miner who solves such a problem gets the right to conduct a transaction and receives a reward. Miners even join pools in order to increase the probability of receiving a reward. And then the pool reward is divided among all participants in proportion to the invested power.
Read more: Mining farm for cryptocurrencies. How to build a farm
Why such difficulties? The fact is that the key element of bitcoin's work is decentralization. In order to ensure it, it is necessary to create a balance of economic incentives. On the one hand, the reward attracts more and more miners. And on the other hand, the mining process is very expensive, so expensive that seizing control of such a network and "centralizing" bitcoin will be a very expensive and virtually impossible task. Today, the cost of capturing a network costs tens of billions of dollars (about 2 million powerful computers are needed, worth about $10,000). At the same time, it should be borne in mind that this is a dynamic and competitive system where there are other players. As soon as such a takeover begins, other players will also increase capacity, and, consequently, this will spur demand for highly specialized computer equipment, and it will continuously increase in price, reducing the economic incentive and the reality of such an undertaking to zero.
As a result, the bitcoin blockchain, in fact, is not only a brilliant technical invention, but also a social economic mechanism with its built-in economic incentives and a system balancing various interests. Due to its unique properties, bitcoin is gaining popularity and proving its suitability for the role of the money of the future. Since 2009, the number of bitcoin users has grown from 0 to 40 million users, and the capitalization of bitcoin at its peak reached more than $ 1 trillion. In 2022, bitcoin almost equaled the capitalization of the ruble's money supply, surpassed the Thai baht, Mexican peso, Saudi rial, Singapore dollar and other currencies. At the moment, bitcoin is in 15th place among all modern currencies in terms of capitalization.
Conclusion
Let's summarize:
- So, bitcoin is a digital currency that exists inside a special blockchain computer network. This network cannot be hacked because it is decentralized (stored on thousands of computers) and protected by a sophisticated encryption mechanism.
- The decentralization of the network is the main advantage that makes bitcoin by all criteria more effective money than any other money that existed before it, since the most difficult issue of trust is solved automatically and does not require any intermediaries.
- Decentralization is supported by a network of miners who benefit from conducting transactions for a commission and a reward in the form of "new" bitcoins. However, the economic incentives in the network are arranged in such a way that no miner can capture the entire network by buying 51% of the capacity, since it will cost an insanely expensive (tens of billions of dollars), and at the same time the cost of this venture will continuously grow due to the limited equipment and the actions of other competing market players.
Read more: How to start trading cryptocurrencies