Bitcoin (BTC) is a decentralized digital currency created in 2009 by an anonymous person or group using the pseudonym Satoshi Nakamoto. It operates on a peer-to-peer network with no central authority — no bank, government, or company controls it.

Bitcoin's value comes from several properties working together: scarcity (there will only ever be 21 million BTC), decentralization (no single point of failure or control), security (the blockchain is computationally infeasible to alter), and network effects (a growing global ecosystem of users, merchants, and institutions).

Unlike fiat currencies which can be printed in unlimited quantities, Bitcoin's supply is mathematically fixed and its issuance schedule is transparent and immutable. This has led many to compare it to "digital gold" — a store of value that protects against currency debasement.

A blockchain is a distributed ledger — a database that is shared and synchronized across thousands of computers (nodes) worldwide. Each entry in the ledger is grouped into a "block," and each block is cryptographically linked to the previous one, forming a chain.

When you send Bitcoin, the transaction is broadcast to the network. Miners (powerful computers) compete to bundle recent transactions into a new block by solving a complex mathematical puzzle — a process called Proof of Work. The first miner to solve the puzzle adds the block to the chain and receives a Bitcoin reward.

Because each block contains a hash of the previous block, altering any historical transaction would require re-mining every subsequent block faster than the entire honest network — practically impossible. This makes blockchain records immutable and transparent without requiring trust in any single party.

Approximately every 4 years (every 210,000 blocks), the reward that Bitcoin miners receive for adding a new block is cut in half. This event is called a halving. Bitcoin started with a reward of 50 BTC per block in 2009. After three halvings it stood at 3.125 BTC per block as of 2024.

Halvings matter for several reasons. First, they reduce the rate of new Bitcoin entering circulation, slowing supply growth. Second, they are a programmed, predictable event — unlike central bank decisions — making Bitcoin's monetary policy transparent. Third, historically each halving has been followed, within 12–18 months, by a significant price appreciation, as reduced supply met consistent or growing demand.

The final Bitcoin is expected to be mined around the year 2140. After that, miners will be compensated purely through transaction fees, creating a long-term security incentive for the network.

"Altcoin" is short for alternative coin — any cryptocurrency other than Bitcoin. There are tens of thousands of altcoins, ranging from major projects with billions in market cap (Ethereum, Solana, BNB) to tiny speculative tokens with minimal liquidity.

Ethereum (ETH) introduced programmable smart contracts, enabling decentralized applications (dApps), DeFi protocols, and NFTs. Solana (SOL) focuses on high throughput and low fees. BNB powers the Binance ecosystem. Ripple (XRP) targets cross-border bank payments.

Key differences from Bitcoin: altcoins often have different consensus mechanisms (Proof of Stake instead of Proof of Work), different supply schedules, different use cases, and different security guarantees. They generally carry higher risk and higher volatility than Bitcoin, as they have smaller networks, less liquidity, and less established track records. Many altcoins have lost 90–99% of their value from peak prices.

Decentralized Finance (DeFi) refers to financial services built on blockchains — primarily Ethereum — that operate through smart contracts instead of traditional intermediaries like banks or brokerages. DeFi protocols allow anyone with a crypto wallet to lend, borrow, trade, earn yield, and access financial tools without creating an account or passing identity verification.

Major DeFi categories include: DEXes (decentralized exchanges like Uniswap, where users trade directly from their wallets), lending protocols (like Aave and Compound, where users earn interest or borrow against collateral), stablecoins (crypto-backed or algorithmic coins pegged to fiat), and yield farming (providing liquidity in exchange for token rewards).

DeFi's advantages are transparency, permissionless access, and composability (protocols can be combined). Its risks include smart contract bugs, oracle failures, liquidation cascades, and the complexity of managing private keys. Total Value Locked (TVL) in DeFi protocols is a commonly tracked metric available in the Market tab above.

Understanding the key metrics shown in this app will help you make more informed decisions.

Market Capitalization = current price × circulating supply. It ranks coins by size. A $500B market cap coin is more established and less volatile than a $50M coin.

24h Trading Volume measures how much of a coin changed hands in the last 24 hours. High volume relative to market cap = high liquidity. Low volume = harder to buy/sell without moving the price.

Circulating vs Total vs Max Supply: Circulating = coins currently in the market. Total = coins in existence (including locked). Max = the hard cap (e.g., 21M for Bitcoin). Knowing all three helps assess future inflation risk.

Bitcoin Dominance = BTC's market cap as a % of total crypto. When dominance rises, Bitcoin is outperforming altcoins. When it falls, altcoins are gaining ground (often called "altcoin season"). Watch this metric — it's one of the most reliable macro indicators in crypto.

A crypto wallet doesn't actually store coins — it stores the private keys that prove ownership and authorize transactions. Whoever controls the private key controls the coins. This is what "not your keys, not your coins" means.

Hot wallets are connected to the internet: exchange accounts (Coinbase, Binance), mobile apps (MetaMask, Trust Wallet), and browser extensions. They're convenient for frequent trading but vulnerable to hacks, phishing, and exchange insolvency. Never keep large amounts on exchanges.

Cold wallets are offline: hardware wallets (Ledger, Trezor) store private keys on a physical device that never connects to the internet. Paper wallets are printed private keys. Cold wallets are the gold standard for long-term storage ("HODLing").

Best practice: keep only what you need for active trading on exchanges. Store the rest in a hardware wallet. Write down your seed phrase (12–24 words) and keep it physically secure — it's the master key to your entire wallet and cannot be recovered if lost.

Crypto markets are notoriously volatile. Bitcoin has experienced multiple drawdowns of 70–85% from peak to trough in its history, only to reach new all-time highs years later. Understanding market cycles can help you avoid panic selling at the worst times.

The typical crypto cycle has four phases: Accumulation (prices are low, sentiment is poor, smart money quietly buys), Markup (prices rise, media attention increases, retail FOMO begins), Distribution (prices near peak, early buyers sell to late entrants), and Markdown (prices fall sharply, late buyers sell at a loss).

The Fear & Greed Index shown at the top of this app quantifies sentiment numerically. Historically, readings below 20 (Extreme Fear) have been excellent long-term buying opportunities, while readings above 80 (Extreme Greed) have often preceded significant corrections. It is not a trading signal — but it's a useful sanity check on your own emotions.

In most countries, cryptocurrency is treated as property for tax purposes, not currency. This has important implications. Every time you sell, trade, or spend crypto, you trigger a taxable event. If you bought Bitcoin at $30,000 and sold at $50,000, you owe tax on the $20,000 gain — even if you immediately reinvested into another coin.

Key concepts: Cost basis is what you paid for the asset (including fees). Capital gain = sale price minus cost basis. Short-term gains (held less than 1 year) are typically taxed as ordinary income. Long-term gains (held more than 1 year) usually receive preferential rates.

Use the P&L calculator in the Calculators tab to estimate your gains or losses. Keep detailed records of every transaction — exchange, date, amount, price in fiat. Many countries also require reporting if your crypto holdings exceed certain thresholds. Consult a tax professional familiar with crypto in your jurisdiction. DisplayMyCoin is an informational tool and does not provide tax advice.

If you're new to crypto, here's a step-by-step approach that avoids the most common costly mistakes.

Step 1 — Learn before you invest. Read and understand Bitcoin's whitepaper (it's only 9 pages). Understand what you're buying and why. Never invest in something because someone else told you it would "go to the moon."

Step 2 — Start with Bitcoin and Ethereum only. They are the most liquid, most researched, and least speculative. Avoid most altcoins until you have a solid foundation.

Step 3 — Use Dollar-Cost Averaging (DCA). Invest a fixed amount weekly or monthly regardless of price. This removes the pressure of timing the market and has historically been one of the best strategies for long-term Bitcoin accumulation. Use the DCA calculator in the Calculators tab to plan your strategy.

Step 4 — Secure your holdings. Once you have more than you're comfortable losing, move coins to a hardware wallet. Never share your seed phrase with anyone.

Step 5 — Set realistic expectations. Crypto is a high-risk, high-volatility asset class. Only invest what you can afford to lose entirely. Diversify across asset classes. Do not use leverage until you are deeply experienced. The majority of people who try to trade actively underperform those who simply buy and hold.