Entry points up front: Binance Official Site, Official Binance App, iOS install walkthrough. Bitcoin (BTC) is the decentralized cryptocurrency released in January 2009 by a developer or group using the pseudonym "Satoshi Nakamoto," and it's the world's first digital asset built on blockchain technology. BTC has a fixed total supply of 21 million coins and runs on the Proof of Work (PoW) consensus mechanism. As of April 2026, roughly 19.72 million BTC are in circulation (93.9% of the total supply), with a market cap of about $1.28 trillion, making it the world's 7th-largest asset class.
Bitcoin was born out of the backdrop of the 2008 global financial crisis. On October 31, 2008, Satoshi Nakamoto published a 9-page paper on the cypherpunk mailing list titled "Bitcoin: A Peer-to-Peer Electronic Cash System," proposing an electronic cash system that doesn't depend on any trusted third party.
On January 3, 2009, Satoshi mined the Bitcoin genesis block and received a 50 BTC reward. The genesis block contains an embedded message: "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks," a headline referencing a critique of the traditional financial system.
On May 22, 2010, programmer Laszlo Hanyecz paid 10,000 BTC for two pizzas — the first transaction to give Bitcoin real-world commercial value. At today's BTC price, those two pizzas would be worth roughly $650 million.
The Bitcoin blockchain is built from four core technical components: a hashing algorithm, blockchain structure, the UTXO model, and PoW consensus.
| Technical component | Function | Bitcoin's implementation |
|---|---|---|
| Hashing algorithm | Ensures data integrity, generates addresses | SHA-256 (double hashing) |
| Blockchain structure | Chains transactions together, tamper-resistant | Merkle Tree + chained blocks |
| UTXO model | Tracks unspent transaction outputs | Each transaction consumes old UTXOs and produces new ones |
| PoW consensus | Miners compete for the right to record blocks | SHA-256 hash difficulty adjustment |
| Digital signatures | Verifies transaction ownership | ECDSA secp256k1 elliptic curve |
| P2P network | Node-to-node communication | TCP port 8333 |
Each BTC block is about 1MB (expanded to about 4MB after SegWit), with an average block time of 10 minutes and roughly 2,000-4,000 transactions per block.
BTC has a fixed total supply of 21 million coins, a hard cap encoded directly into the protocol. New BTC enters circulation through block rewards paid to miners: the initial block reward was 50 BTC, halving every 210,000 blocks (about 4 years).
| Halving event | Date | Block reward | Total circulating | % of total supply |
|---|---|---|---|---|
| Genesis | 2009-01-03 | 50 BTC | 50 | 0.0002% |
| 1st halving | 2012-11-28 | 25 BTC | 10.5 million | 50% |
| 2nd halving | 2016-07-09 | 12.5 BTC | 15.75 million | 75% |
| 3rd halving | 2020-05-11 | 6.25 BTC | 18.37 million | 87.5% |
| 4th halving | 2024-04-19 | 3.125 BTC | 19.68 million | 93.75% |
| 5th halving (projected) | 2028-04 | 1.5625 BTC | 20.34 million | 96.9% |
| Last BTC mined (projected) | 2140 | 0 BTC | 21 million | 100% |
The halving mechanism makes BTC a supply-certain asset — in contrast to fiat currencies, which can be issued without limit, this makes it an absolutely scarce asset.
Proof of Work (PoW) is Bitcoin's consensus mechanism. Miners compete using computing power to find a block hash that satisfies the difficulty target, and the first miner to find it earns the block reward.
The core elements of PoW:
The first element is the hash puzzle. Miners need to find a nonce value such that the block header's hash is below the target difficulty. There's no shortcut for this process — it can only be brute-forced.
The second element is difficulty adjustment. Bitcoin adjusts mining difficulty every 2,016 blocks (about 2 weeks) to keep the average block time at 10 minutes. The greater the total network hash rate, the higher the difficulty.
The third element is economic incentive. Miners who successfully package a block earn the block reward plus transaction fees. As of April 2026, miners earn roughly $29.2 million a day, with block rewards making up about 60% and transaction fees about 40%.
As of April 2026, Bitcoin's total network hash rate is about 850 EH/s (source: Cambridge BCEI), 70 times what it was in 2017. Mining hardware is primarily manufactured by Chinese firms Bitmain and MicroBT, with the mainstream model being the Antminer S21 (200 TH/s, 3,500W).
| Mining pool | Hash rate share | Headquarters | Main mining locations |
|---|---|---|---|
| Foundry USA | 28% | United States | US/Canada |
| AntPool | 18% | China | US/Russia/Asia |
| F2Pool | 10% | Singapore | Asia/Americas |
| ViaBTC | 9% | China | US/Europe |
| MARA Pool | 8% | United States | United States |
| Binance Pool | 6% | Global | Global |
| Others | 21% | - | - |
The geographic footprint of mining has shifted from China's 65% share before the 2021 mining ban to today's mix of 38% United States, 12% Kazakhstan, 10% Russia, 8% Canada, and 8% China.
Bitcoin addresses come in four formats: legacy addresses (P2PKH, starting with 1), SegWit addresses (P2SH-P2WPKH, starting with 3), native SegWit addresses (P2WPKH, starting with bc1q), and Taproot addresses (P2TR, starting with bc1p).
| Address type | Prefix | Average transaction fee | Recommended use |
|---|---|---|---|
| Legacy P2PKH | 1 | High | Best compatibility |
| SegWit P2SH | 3 | Medium | A middle-ground option |
| Native SegWit | bc1q | Low | Mainstream recommendation |
| Taproot | bc1p | Lowest | Privacy and advanced features |
Mainstream BTC wallets include hardware wallets (Ledger, Trezor), desktop wallets (Electrum, Bitcoin Core), mobile wallets (Trust Wallet, Phantom), and CEX custody (Binance, Coinbase).
BTC's financial identity has gone through three distinct phases:
Phase one: digital cash (2009-2014). Satoshi's original design was a "peer-to-peer electronic cash system," emphasizing payments and value transfer. But Bitcoin's 7 TPS (transactions per second) throughput and 10-minute confirmation time made it a poor fit for everyday small payments.
Phase two: digital gold (2015-2020). BTC's fixed supply led people to compare it to gold's store-of-value properties. Institutions began treating BTC as an inflation hedge, with MicroStrategy starting large-scale purchases in 2020.
Phase three: institutional asset allocation (2021-present). In January 2024 the US approved spot Bitcoin ETFs, bringing BTC into traditional financial infrastructure as one of institutions' asset allocation options. As of April 2026, the 11 US spot Bitcoin ETFs have seen cumulative net inflows exceeding $58 billion.
BTC holder structure as of April 2026 (sources: Glassnode, Arkham, and public company disclosures):
| Holder | BTC held (millions) | Share of circulating supply | Characteristics |
|---|---|---|---|
| Lost (keys lost / early dormant) | 3.5 | 17.7% | Permanently out of circulation |
| Satoshi Nakamoto (presumed dormant) | 1.1 | 5.6% | Founder's holdings, untouched |
| US spot Bitcoin ETFs | 1.1 | 5.6% | Institutional custody |
| MicroStrategy | 0.53 | 2.7% | Public company holdings |
| Other public companies | 0.22 | 1.1% | Institutional holdings |
| Governments (US/China/UK, etc.) | 0.5 | 2.5% | Government holdings |
| Exchange balances | 2.35 | 11.9% | Short-term liquid supply |
| Retail/unknown | 10.42 | 52.9% | Retail and small institutions |
Truly tradable supply (excluding lost coins, Satoshi's dormant holdings, and government cold storage) is about 14.6 million BTC, or 74% of circulating supply. This is BTC's real, liquid supply.
As of April 25, 2026, BTC trades at roughly $65,000 USDT, with a market cap of about $1.28 trillion, making it the world's 7th-largest asset class.
| Valuation metric | Current value | Historical range |
|---|---|---|
| Price | $64,800 | $0.0001 ~ $108,000 |
| Market cap | $1.28 trillion | $0 ~ $2.13 trillion |
| Circulating supply | 19.72 million BTC | Total 21 million |
| MVRV | 2.3 | 0.6 ~ 11.5 |
| Stock-to-Flow | 65 | 25 ~ 65 |
| Share of total crypto market cap | 49.2% | 33% ~ 78% |
| Global asset rank | 7th | - |
BTC's current valuation is an order of magnitude below gold's (roughly $19 trillion market cap). If the "digital gold" narrative of fully catching up to gold plays out, there's roughly 15x of long-term upside.
Bitcoin's base layer wasn't designed to support smart contracts, but its ecosystem has gradually expanded through Layer 2 and sidechain solutions.
| L2 / sidechain solution | Main function | Current TVL ($ millions) | Representative projects |
|---|---|---|---|
| Lightning Network | Lightning payment channels | 650 | Strike, Wallet of Satoshi |
| Stacks | Smart contracts (PoX consensus) | 280 | sBTC |
| Rootstock RSK | Smart contracts (merged mining) | 120 | Money on Chain |
| Liquid Network | Federated sidechain (Blockstream) | 150 | L-BTC |
| Babylon | BTC staking into PoS chains | 520 | Multi-chain staking |
| BounceBit | BTC restaking | 350 | Dual-token staking |
A new trend in the BTC ecosystem is on-chain NFT and token innovation driven by the Ordinals and Runes protocols — from 2024 to 2026, cumulative Ordinals inscriptions have exceeded 70 million, and Runes have exceeded 60,000 distinct tokens.
Ordinals is the Bitcoin "ordinal" protocol proposed by Casey Rodarmor in January 2023, which gives every satoshi (the smallest BTC unit, one hundred-millionth of a BTC) a unique number and lets arbitrary data — images, text, video — be attached to it.
| Protocol | Launch date | Cumulative inscriptions | Main use case |
|---|---|---|---|
| Ordinals | 2023-01 | 70 million+ | NFTs/inscriptions |
| BRC-20 | 2023-03 | 60,000+ | ERC-20-like tokens |
| Runes | 2024-04 | 60,000+ | An improved BRC-20 |
| Atomicals | 2023-09 | 500,000+ | Digital asset protocol |
BRC-20 token ORDI gained more than 100x in 2023, but its market cap has since shrunk dramatically, reflecting just how speculative the inscription sector is.
Bitcoin mining's energy consumption has long been a point of contention. As of April 2026, BTC's total annual network electricity consumption is about 175 TWh (source: Cambridge BCEI), roughly equivalent to Poland's entire annual electricity use.
| Data point | Value | Compared to |
|---|---|---|
| 175 TWh | BTC mining | - |
| 90 TWh | All of Google's data centers | 1.94x BTC |
| 220 TWh | All global data centers combined | 1.26x BTC |
| 2,800 TWh | Rough estimate of global wasted electricity | 16x BTC |
| 27,000 TWh | Total global electricity consumption | 154x BTC |
Renewable energy makes up roughly 52% of mining's energy mix (source: Bitcoin Mining Council), higher than the global average energy mix. But the debate continues, and some countries (China, Iran) have banned BTC mining outright.
BTC's legal status varies enormously across countries:
| Country/region | Legal status | Key regulatory measures |
|---|---|---|
| United States | Commodity (CFTC) / asset | Spot ETFs approved, FIT21 Act legislation |
| European Union | Crypto-asset | Unified regulation under MiCA |
| Japan | Legal payment method | FSA licensing system |
| South Korea | Legal but restricted | Real-name system + five licensed exchanges |
| Mainland China | Trading/mining banned | The "94 notice" + the "9/24 notice" |
| Singapore | Legal | MAS licensing |
| El Salvador | Legal tender | Mandatory acceptance |
| Central African Republic | Legal tender | Announced in 2022 |
| India | Legal but taxed at 30% | RBI restrictions |
| Russia | Legal to hold | Cannot be used for payments |
Mainland Chinese residents can't trade domestically, but holding BTC isn't illegal. The main access channel is still C2C fiat on-ramps through the international versions of Binance and OKX.
Evaluating BTC's investment value comes down to three core dimensions:
The first dimension is scarcity. BTC's fixed total supply of 21 million coins makes it an absolutely scarce asset compared with gold (about 1.5% annual new supply) and fiat currency (5-15% annual new supply).
The second dimension is institutional adoption. Institutional holdings have risen from about 5% of supply in 2020 to about 11% in 2026, with ETF channels still absorbing new inflows.
The third dimension is geopolitical hedging. As a "non-sovereign currency," BTC carries hedging value during periods of geopolitical tension and instability in the dollar system.
| Investment strategy | Suitable for | Suggested allocation | Holding period |
|---|---|---|---|
| Long-term dollar-cost averaging | Regular investors | 5-10% of total assets | 3+ years |
| Value investing | Medium-to-long-term investors | 10-25% | 1-3 years |
| Trend following | Professional traders | Flexible | Months |
| High-leverage futures | Speculators (not recommended) | No more than 5% | Days |
The main risks BTC faces today:
The first risk is macro liquidity tightening. If the Federal Reserve restarts a rate-hiking cycle and global liquidity tightens, BTC would likely pull back to the $40,000-$50,000 range.
The second risk is regulatory reversal. The Trump administration's friendly policies could reverse after a change in government post-2028; regulatory uncertainty never fully goes away.
The third risk is technical risk. Quantum computing threats (unlikely to materialize in the near term), contentious network forks, and mining concentration are all ongoing technical concerns.
The fourth risk is competitive risk. Other chains like ETH and SOL offer richer functionality; if BTC's ecosystem doesn't expand, it risks a long-term decline in crypto market share.
Q: What is Bitcoin (BTC)? A: The decentralized cryptocurrency released in 2009 by a developer using the pseudonym "Satoshi Nakamoto," the world's first digital asset built on blockchain technology. BTC has a fixed total supply of 21 million coins and runs on the PoW consensus mechanism.
Q: Who invented Bitcoin? A: A developer using the pseudonym "Satoshi Nakamoto" (Satoshi Nakamoto). Satoshi published the whitepaper in 2008 and mined the genesis block in 2009. Their true identity has never been revealed, and they disappeared from the crypto community entirely after 2011.
Q: Why is Bitcoin's total supply 21 million? A: It's a hard cap encoded directly into the protocol. It's derived from three parameters working together: an initial block reward of 50 BTC, halving every 210,000 blocks, and the reward reaching zero after roughly 64 halvings — which together work out to a total supply of 21 million.
Q: How much is Bitcoin worth right now? A: As of April 25, 2026, BTC trades at roughly $64,800 USDT, with a market cap of about $1.28 trillion, making it the world's 7th-largest asset class.
Q: What can Bitcoin actually be used to buy? A: Real-world payment use cases remain limited. BTC's mainstream uses are as an investment asset, for cross-border transfers, and as a geopolitical hedge. Small everyday payments are possible via the Lightning Network, but its user base is still small.
Q: What is Bitcoin mining? A: The process where miners use specialized hardware (ASIC mining rigs) to compete for the right to record blocks via SHA-256 hash computation. The first miner to find a block hash meeting the difficulty target earns the block reward plus transaction fees.
Q: How often does Bitcoin halve? A: Every 210,000 blocks (about 4 years). Four halvings have occurred so far — in 2012, 2016, 2020, and 2024. The next halving is expected in April 2028, dropping the block reward to 1.5625 BTC.
Q: What's the difference between Bitcoin and Ethereum? A: BTC's design goal is "digital gold" and value storage — its technology is simple, stable, and doesn't support smart contracts; ETH's design goal is a "world computer," supporting smart contracts and complex applications. BTC's supply is a fixed 21 million, while ETH's supply adjusts dynamically with a deflationary mechanism.
Q: Is Bitcoin secure? A: At the protocol level, BTC has never been compromised in 17 years, making it the most secure network in crypto. But risk at the user level is high: lost private keys, phishing scams, and exchange hacks can all lead to loss of funds.
Q: Can mainland Chinese residents buy Bitcoin? A: Domestic trading channels are banned (the "94 notice," the "9/24 notice"), but holding BTC isn't illegal. The mainstream access channel is C2C fiat on-ramps through the international versions of Binance and OKX, which require an overseas phone number or email to register.
Q: What is a Bitcoin spot ETF? A: An exchange-traded fund that directly holds BTC and tracks its price as its net asset value. The 11 US spot ETFs were approved and listed in January 2024, and as of April 2026 have seen roughly $58 billion in cumulative net inflows, with total AUM of $118 billion.
Q: How high could BTC still go? A: In the long run, if BTC's "digital gold" narrative fully plays out (reaching a market cap equal to one-third of gold's), the price could reach $300,000-$500,000 per coin. But in the short term it's affected by multiple factors — macro liquidity, regulation, market sentiment — making precise prediction impossible.
Q: What's the safest way to buy Bitcoin? A: For long-term holding, use cold storage via a hardware wallet (Ledger/Trezor); for regular dollar-cost averaging, use a CEX's (Binance/OKX) spot account; for institutional or compliance-focused accounts, use US spot Bitcoin ETFs (IBIT, FBTC).
Q: Could Bitcoin go to zero? A: At the protocol level, the probability of BTC going to zero is extremely low (17 years without a breach, maintained by thousands of nodes globally). But the probability of BTC's price going to zero would require considering scenarios like sweeping regulatory crackdowns, a fatal technical flaw, or the emergence of a disruptive replacement.
Q: Can BTC be held long-term the way gold is? A: BTC's fixed supply of 21 million gives it gold-like scarcity, but its volatility (42% annualized) is far higher than gold's (15% annualized). We'd suggest treating BTC as a "high risk, high reward" asset allocation, keeping it to 5-15% of total assets.
Data sources: CoinGecko, Glassnode, Cambridge BCEI, SoSoValue ETF data, Bitcoin Mining Council, various government announcements, Arkham Intelligence, public company financial reports, as of April 25, 2026.