What is Bitcoin

Bitcoin (BTC) is the world's first decentralized digital currency, created in 2009 by the pseudonymous Satoshi Nakamoto. Operating without banks, governments, or any central authority, Bitcoin records every transaction on a public distributed ledger the blockchain maintained by a global network of computers following identical protocol rules. With a mathematically enforced fixed supply of 21 million coins, Bitcoin is often described as "digital gold" a scarce, censorship-resistant store of value.

THE BITCOIN WHITEPAPER

On October 31, 2008, Nakamoto published "Bitcoin: A Peer-to-Peer Electronic Cash System" a nine-page document describing a system for electronic payments without relying on financial institutions. It solved the double-spending problem that had prevented digital cash from existing, using cryptographic proof and a distributed consensus mechanism instead of a trusted third party.

HOW BITCOIN WORKS

Transactions: When you send Bitcoin, your transaction is broadcast to a peer-to-peer network of nodes. Each node verifies you own the coins being sent through cryptographic proof (your digital signature with your private key).
Mining: Specialized computers called miners compete to solve SHA-256 computational puzzles. The winner adds the next block of transactions to the blockchain and earns the block reward plus transaction fees.
Immutability: Altering any confirmed block would require redoing all computational work for that block and every subsequent block practically impossible given Bitcoin's hash rate.

BITCOIN HALVINGE

very 210,000 blocks (approximately every 4 years), the block reward is cut in half. This programmatic supply reduction is called the halving. As of the April 2024 halving, miners earn 3.125 BTC per block. The next halving (~2028) will reduce this to 1.5625 BTC. Historical halving cycles have preceded significant bull market periods.

BITCOIN AS AN INVESTMENT

Bitcoin has been the best-performing asset of the past decade. The January 2024 approval of spot Bitcoin ETFs in the USA brought BlackRock, Fidelity, and institutional capital into the market at unprecedented scale. Bitcoin's market cap exceeds $1.7 trillion as of early 2025.

Terms in addition to the Bitcoin

Blockchain

A blockchain is a subset of a distributed database. The Bitcoin inventors originally prototyped the system in 2008. This modern database is made up of separate blocks that are connected together in a chronological chain. Blockchains may be used to store a wide range of data types. It has mostly been utilized as a public ledger for bitcoin transactions to date. A peer-to-peer network comprised of independent nodes uses a consensus process to ensure the blockchain's security and legitimacy. Each node in the network keeps a public and immutable copy of the data.

2 Factor Authentication (2FA)

2 Factor Authentication is a security measure with two layers. It is used by the majority of cryptocurrency exchanges. To log in, you must provide not only a password, but also a code obtained, for example, from the Google authenticator.

Airdrop

An airdrop is a method of distributing coins. End users can typically obtain coins for free or in exchange for doing a small task, such as subscribing to a newsletter, sending a tweet, or inviting others via a personal affiliate link. Cryptocurrency airdrops — the act of depositing cryptocurrency into public crypto wallets — are utilized as a marketing, liquidity creation, and network bootstrapping technique for many different types of blockchain initiatives.

Altcoin

Altcoin - "alternative coin" - is any kind of digital currency other than Bitcoin. Since the launch of Bitcoin, the world's first digital currency, many altcoins (as well as supporting blockchains) have been created. Altcoin digital currencies share many similarities to Bitcoin, but consistently and have significant differences. There are about 20,000 altcoins, and this number is expected to grow significantly in the coming years. Altcoins often develop Bitcoin features. Ethereum, currently the most widely used blockchain, supports digital contracts and separate applications where Bitcoin does not. Altcoins are also often created to cater to the needs of different users. The Litecoin blockchain, for example, can process payments quarterly for the duration of Bitcoin.

Cold Storage

Cold storage is the way to store cryptocurrency offline. The word refers to the use of offline wallets that are not connected to the internet. Cold storage is the most secure way to keep cryptocurrencies since an offline currency becomes less likely to be hacked and stolen. Paper wallets, printed renditions of private keys, and offline hardware and software wallets are all examples of cold storage.