Bitcoin (BTC) is the first decentralized cryptocurrency, created in 2009 by the pseudonymous Satoshi Nakamoto as a peer-to-peer electronic cash system that operates without intermediaries. It introduced blockchain technology to the world and remains the largest cryptocurrency by market capitalization.
| Stat | Value |
|---|---|
| Ticker | BTC |
| Price | $71,094.00 |
| Market Cap | $1.42T |
| 24h Change | -0.7% |
| Circulating Supply | 20.02M BTC |
| Max Supply | 21.00M BTC |
| All-Time High | $126,080.00 |
How It Works
Bitcoin runs on a decentralized network of nodes that validate and relay transactions. The process follows these steps:
- A user broadcasts a transaction signed with their private key.
- Nodes verify the transaction against the UTXO set to confirm unspent funds.
- Miners compete to solve a cryptographic puzzle (proof of work) to add a new block.
- The winning miner broadcasts the block; other nodes verify and accept it.
- The transaction is confirmed once included in a block, with security increasing with each subsequent block.
Bitcoin targets a new block every 10 minutes, with difficulty adjusting every 2,016 blocks (~2 weeks) to maintain this pace.
Tokenomics
Bitcoin has a hard-capped supply of 21 million BTC. New coins enter circulation through block rewards, which halve approximately every 210,000 blocks (~4 years):
| Halving | Year | Block Reward | Total Supply Mined |
|---|---|---|---|
| 0 | 2009 | 50 BTC | 0% |
| 1 | 2012 | 25 BTC | ~50% |
| 2 | 2016 | 12.5 BTC | ~75% |
| 3 | 2020 | 6.25 BTC | ~87.5% |
| 4 | 2024 | 3.125 BTC | ~93.75% |
The final bitcoin is projected to be mined around the year 2140. After that, miners will be compensated solely through transaction fees.
Use Cases
- Store of value — Often called “digital gold,” BTC is held as a hedge against inflation and currency debasement.
- Payments — Accepted by merchants worldwide, though Lightning Network is preferred for small transactions due to lower fees.
- Remittances — Cross-border transfers without banking intermediaries, particularly useful in regions with limited financial infrastructure.
- Treasury reserve — Publicly traded companies (MicroStrategy, Tesla) and nations (El Salvador) hold BTC on their balance sheets.
History
- 2008 — Satoshi Nakamoto publishes the Bitcoin whitepaper, “Bitcoin: A Peer-to-Peer Electronic Cash System.”
- 2009 — The genesis block (Block 0) is mined on January 3, containing the message: “The Times 03/Jan/2009 Chancellor on brink of second bailout for banks.”
- 2010 — The first real-world Bitcoin transaction: Laszlo Hanyecz pays 10,000 BTC for two pizzas, now celebrated as Bitcoin Pizza Day.
- 2011 — Bitcoin reaches parity with the US dollar for the first time. Satoshi Nakamoto’s last known communication.
- 2013 — BTC surpasses $1,000 for the first time. The FBI seizes Silk Road, the darknet marketplace that used Bitcoin.
- 2014 — Mt. Gox, then the largest Bitcoin exchange, collapses after losing 850,000 BTC to hackers.
- 2017 — Bitcoin hits nearly $20,000 during a massive retail-driven bull run. The Bitcoin Cash fork occurs over block size disagreements.
- 2020 — Institutional adoption begins: MicroStrategy and Square make large BTC purchases. PayPal enables crypto trading.
- 2021 — Bitcoin reaches an all-time high above $69,000. El Salvador adopts BTC as legal tender. The first US Bitcoin futures ETF launches.
- 2024 — US SEC approves spot Bitcoin ETFs (BlackRock, Fidelity, and others). The fourth halving reduces block rewards to 3.125 BTC.
Common Misconceptions
“Bitcoin is anonymous.”
Bitcoin is pseudonymous, not anonymous. All transactions are recorded on a public blockchain. Wallet addresses don’t contain names, but transaction patterns can be traced using blockchain analysis tools. True privacy requires additional layers like CoinJoin mixing.
“Bitcoin has no intrinsic value.”
Value is subjective. Bitcoin’s value derives from its provable scarcity (21 million cap), decentralization, censorship resistance, and the energy and infrastructure securing the network. These properties make it useful as a settlement layer and store of value.
“Bitcoin is too slow for payments.”
The base layer processes ~7 transactions per second by design, prioritizing security and decentralization. The Lightning Network operates as a Layer 2 solution enabling near-instant, low-fee transactions suitable for everyday payments.
Criticisms
- Energy consumption — Bitcoin’s proof-of-work consensus requires substantial electricity. Proponents argue it increasingly uses renewable energy and secures a trillion-dollar network.
- Transaction speed — Base layer throughput is limited compared to traditional payment rails. Layer 2 solutions partially address this.
- Price volatility — Large price swings make BTC challenging as a unit of account, though volatility has decreased over time.
- Wealth concentration — A small number of wallets hold a significant portion of total supply, though many large wallets belong to exchanges holding funds for millions of users.
- Regulatory uncertainty — Governments worldwide are still developing frameworks for Bitcoin taxation, custody, and exchange regulation.
Social Media Sentiment
Bitcoin dominates crypto social media. On r/Bitcoin, the community focuses on long-term holding (“HODLing”), Lightning Network adoption, and self-custody. r/cryptocurrency has a broader view, often debating Bitcoin maximalism vs. multi-chain ecosystems. On X (Twitter), Bitcoin discourse splits between “laser eyes” maximalists who see BTC as the only viable cryptocurrency and pragmatists who acknowledge its limitations. Key recurring narratives include “digital gold,” the stock-to-flow model, halving cycle price predictions, and the growing institutional adoption through spot ETFs.
Last updated: 2026-04
Related Terms
See Also
Research
- Nakamoto, S. (2008). Bitcoin: A Peer-to-Peer Electronic Cash System. Self-published.
- Back, A. (2002). Hashcash — A Denial of Service Counter-Measure. Self-published.
- Haber, S., & Stornetta, W. S. (1991). How to Time-Stamp a Digital Document. Journal of Cryptology, 3(2), 99–111. Springer.
- Szabo, N. (1994). Smart Contracts. Self-published.
- Chaum, D. (1983). Blind Signatures for Untraceable Payments. Advances in Cryptology — CRYPTO 1982. Springer.