Bitcoin

Bitcoin is a type of digital money.

It was made by a person named Satoshi Nakamoto. No one knows who that is!

It does not use a bank. Instead, many computers work together. Each computer keeps a list of all the money sent.

Special computers work hard to make new bitcoin. This is called mining. It uses a lot of power.

People use it to buy things. One man even used it to buy two pizzas!

Some lands have used it as real money. It is a very new way to pay.

Bitcoin is a type of digital money.

It was made in 2008 by Satoshi Nakamoto. No one knows who that person is. People began using it in 2009.

Bitcoin does not use a bank. Instead, it uses a peer-to-peer network. This is a group of computers that talk to each other. Each computer is called a node. Every node keeps a copy of a public list. This list is called a blockchain. It shows all the money sent and received.

Computers use a way called mining to make new bitcoin. These computers solve hard math puzzles. This set of steps is called proof of work. Mining uses a lot of electricity. This can hurt the environment.

One bitcoin can be split into very small parts. The smallest part is a satoshi. In 2010, a man used 10,000 bitcoin to buy two pizzas.

Today, many big companies own bitcoin. Some countries, like El Salvador, have used it as legal money.

Bitcoin is a type of digital money that works without a central bank.

Instead of a single company in charge, it uses a peer-to-peer network. This means many different computers talk directly to each other. Each computer in this group is called a node. Every node keeps its own copy of a public list of all transactions. This list is known as a blockchain. Because everyone has a copy, no single person can control the money. It is a new way to think about how we trade value online.

The system works through a step-by-step process. First, someone wants to send bitcoin to another person. This request is sent to the network of nodes. The nodes use cryptography, which is a way of using math to keep data secret, to validate the transaction. This makes sure the sender actually owns the bitcoin. To add new transactions to the list, computers perform a task called mining. This is a hard job where computers solve complex puzzles to reach a consensus, or agreement, on the truth. Once a new block is finished, it is added to the chain every ten minutes on average.

Many people tried to make digital cash long before bitcoin arrived. In the 1980s, David Chaum created something called ecash. In 1992, researchers Cynthia Dwork and Moni Naor suggested using math puzzles to create value. Later, Adam Back developed a system called Hashcash in 1997. Other thinkers like Wei Dai and Nick Szabo also shared early ideas in 1998. However, these earlier attempts often needed a central leader or had other flaws. In 2008, a person using the name Satoshi Nakamoto published a paper that finally solved these problems. Nakamoto's work combined these older ideas into the first working blockchain.

Bitcoin has a very interesting history of use and growth. On May 22, 2010, a programmer named Laszlo Hanyecz bought two Papa John's pizzas for 10,000 bitcoin. This famous event is now called "Bitcoin Pizza Day." In 2021, the total value of all bitcoin reached $1 trillion. Some countries have even used it as official money. El Salvador adopted bitcoin as legal tender in September 2021. By December 2024, the price of a single bitcoin reached $100,000 for the first time. Today, millions of people around the world use it.

You can think of bitcoin like a digital version of gold or coins. Just as you can break a large coin into smaller change, you can divide bitcoin. One bitcoin can be split into eight decimal places. The smallest possible piece is called a satoshi.

This makes it possible to buy even very small things. While it is digital, it acts like a real tool for many people. Some people use it for fundraising, while big companies use it to hold value. It connects the world of computers to the world of money.

Bitcoin is the first decentralized cryptocurrency. It is a digital form of money that operates without a central authority or single administrator.

Unlike traditional money, which relies on banks, bitcoin uses a peer-to-peer network. This network consists of many computers called nodes. Each node maintains an independent copy of a public distributed ledger. This ledger is known as a blockchain. The blockchain records all transactions in an ordered list of blocks. This system allows anyone to create an address and transact without needing permission from a central institution.

The blockchain mechanism works through a specific sequence of digital steps. First, a user initiates a transaction to send bitcoin to another address. This transaction is broadcast to the peer-to-peer network of nodes. To ensure security, the system uses cryptography. This involves complex mathematics to validate that the sender actually owns the bitcoin. A user must use a private key to digitally sign their transactions. As long as the owner keeps this sensitive data secret, others cannot spend their bitcoin.

Once validated, the transaction must be added to the ledger.

To add new transactions, the network must reach a consensus. This is achieved through a process called mining. Mining is a computationally intensive task performed by purpose-built computers. These computers compete to solve mathematical puzzles to create a new block. On average, a new block is created every ten minutes. Each block contains a SHA-256 hash, which is a unique digital fingerprint of the previous block. This creates a chronological chain that prevents anyone from spending the same bitcoin twice. However, mining consumes large quantities of electricity. This high energy use has led to criticism regarding its environmental impact.

Bitcoin's creation was the result of decades of research into digital cash. In the 1980s, David Chaum developed ecash, but it required centralized control. In 1992, cryptographers Cynthia Dwork and Moni Naor proposed using computational puzzles for value. Adam Back later developed Hashcash in 1997 to control spam. Other thinkers like Wei Dai and Nick Szabo proposed early digital currencies in 1998. None of these were fully successful due to issues like Sybil attacks or double-spending. In 2008, an unknown person using the pseudonym Satoshi Nakamoto published a white paper. This paper described a peer-to-peer electronic cash system. Nakamoto released the open-source software and mined the first block, called the genesis block, on January 3, 2009.

The history of bitcoin includes many notable milestones and shifts in value. On May 22, 2010, Laszlo Hanyecz performed the first commercial transaction by buying two pizzas for 10,000 bitcoin. This event is celebrated as "Bitcoin Pizza Day." As the technology grew, it faced regulatory challenges. In 2013, the US government seized the Mt. Gox exchange and funds from the Silk Road. China also prohibited financial institutions from using bitcoin in 2013. Despite these hurdles, the market grew significantly. In February 2021, bitcoin's market capitalization reached $1 trillion for the first time. By December 2024, the price of a single bitcoin reached $100,000.

Bitcoin is highly divisible, allowing it to be used for various transaction sizes. The unit of account is the bitcoin, often represented by the symbol ₿. One bitcoin can be divided into eight decimal places. The smallest unit is called a satoshi, which represents one hundred-millionth of a bitcoin.

Because of this divisibility, people can send very small amounts. This flexibility has allowed bitcoin to be used by diverse groups. For example, during the 2022 Canadian trucker protests, organizers used bitcoin for fundraising. This demonstrated how the system can function when traditional financial platforms restrict access.

Today, bitcoin connects digital technology to global economics and government policy. Some nations have integrated it into their formal systems. El Salvador adopted bitcoin as legal tender in September 2021.

While recent reforms in 2025 changed business obligations, it remains a significant part of their legal landscape. In the United States, the government has moved toward creating strategic bitcoin reserves. Large companies like MicroStrategy and Square, Inc. have also acquired bitcoin as a reserve asset. As of 2023, an estimated 81.7 million people used bitcoin, which is about 1% of the global population. The system continues to evolve through software upgrades like SegWit and Taproot.