Finance

Cryptocurrency

Digital assets using blockchain — Bitcoin and beyond

Cryptocurrency is digital currency using cryptography for security and operating on decentralized networks (typically blockchain). Bitcoin (2009): first cryptocurrency; pseudonymous creator Satoshi Nakamoto. Ethereum (2015): added smart contracts. Thousands of cryptocurrencies now. Properties: decentralized, often pseudonymous, programmable, internationally transferable, scarce (cap on supply). Volatility: extreme. Regulation: evolving globally. Use cases: investment, transactions, smart contracts, NFTs, DeFi (decentralized finance), remittances. Energy concerns: Bitcoin mining uses ~150 TWh/year (Argentina-level). Future: uncertain; high volatility, regulatory questions.

  • First cryptoBitcoin (2009, Satoshi Nakamoto)
  • FoundationBlockchain — decentralized ledger
  • Bitcoin supply cap21 million coins (programmed)
  • VolatilityExtreme
  • Major coinsBitcoin, Ethereum, plus thousands
  • ConcernsVolatility, energy use, regulation, scams

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Why cryptocurrency matters

  • Financial innovation. New asset class.
  • Investment. Many invest.
  • Cross-border payments. Remittances.
  • DeFi. Alternative finance.
  • Currency alternatives. Inflationary economies.
  • Web3. Decentralized internet vision.
  • Public policy. Regulation challenges.

Common misconceptions

  • All crypto = Bitcoin. Many distinct.
  • Anonymous. Pseudonymous; trackable.
  • Stable store of value. Extreme volatility.
  • No regulation. Increasingly regulated.
  • Replaces traditional finance. Coexisting.
  • All for crime. Most users legal; some illicit.

Frequently asked questions

What's cryptocurrency?

Digital currency using cryptography. Operates on decentralized networks (blockchain). No central authority. Owners control via private keys. Transactions: irreversible, recorded on public ledger. Bitcoin: first and largest. Ethereum: second; supports smart contracts. Many others (altcoins). Combined market cap: $1-2 trillion (volatile).

What's blockchain?

Decentralized ledger technology. Records of all transactions stored across many computers (nodes). Immutable: changes require consensus. Verified by network. Bitcoin uses Proof-of-Work (energy-intensive). Ethereum (post-2022): Proof-of-Stake (less energy). Foundational technology. Different blockchains: different properties.

How does Bitcoin work?

(1) Transactions broadcast to network. (2) Verified by miners (computers solving puzzles for reward). (3) Confirmed transactions added to blocks. (4) Blocks linked into chain. (5) ~10 minutes per block. Mining: gets harder over time; halving every 4 years (rewards halve). Cap: 21 million BTC ever. Decentralized: no central authority.

What's Ethereum?

Cryptocurrency + smart contract platform. Vitalik Buterin (2015). Smart contracts: self-executing code on blockchain. Enables: decentralized applications (DApps), DeFi, NFTs. Token: Ether (ETH). Major upgrade 2022 (PoW to PoS). Supports thousands of tokens (ERC-20 standard). Foundation of Web3 ecosystem.

What about NFTs?

Non-Fungible Tokens. Unique digital items on blockchain. Used for: digital art, collectibles, virtual real estate, gaming items. Boom in 2021. Many controversies. Bored Ape Yacht Club, CryptoPunks famous. Mostly ERC-721 standard on Ethereum. Critique: easily copied images; environmental concerns. Niche but persistent.

What's DeFi?

Decentralized finance. Financial services on blockchain. Lending, borrowing, trading, insurance — without traditional intermediaries. Uses smart contracts. Examples. (1) Uniswap: decentralized exchange. (2) Aave: lending protocol. (3) Compound: lending. Risks. Smart contract bugs (millions lost). Regulatory uncertainty. Market manipulation. Innovation potential.

What about regulation?

Evolving globally. (1) US: SEC views many tokens as securities. CFTC regulates futures. Multiple agencies involved. Recent: ETFs approved 2024. (2) EU: MiCA regulation framework. (3) China: banned crypto. (4) El Salvador: Bitcoin legal tender. (5) Money laundering, taxes: major focus. Future: unclear but increasing oversight.

What about volatility?

Extreme. Bitcoin: $20K (2017) → $3K (2019) → $69K (2021) → $16K (2022) → $100K+ (2024). Many other coins more volatile. Reasons. (1) Speculative trading. (2) Limited liquidity. (3) Regulatory news. (4) Hype/fear cycles. (5) No fundamental anchor. Bitcoin proponents: limited supply makes valuable. Others: speculative bubble. Time will tell.