Cryptocurrency 101

What Is Cryptocurrency?

🪙 CRYPTOCURRENCY IN PLAIN ENGLISH

Cryptocurrency is digital money secured by cryptography — lines of code — rather than a government or central bank. No single person, company, or government controls it.

💡 THE CORE IDEA
Traditional money (dollars, euros) is created and controlled by governments and central banks. Crypto flips that — it runs on a decentralized network where rules are set by code, not institutions.

📊 KEY TERMS DEFINED

Cryptocurrency: A digital currency that uses cryptography for security and operates on a decentralized network.

Wallet: Software or hardware that stores your private keys — your proof of ownership. You don't store coins; you store keys.

Exchange: A marketplace where you buy, sell, or trade crypto (such as Coinbase, Kraken, or Gemini — for illustrative purposes only, not a recommendation).

Private Key: A secret code that proves ownership of your crypto — like a password that cannot be reset. Lose it, lose your assets forever.

🔑 THE MOST IMPORTANT PRINCIPLE
"Not your keys, not your coins." If you leave crypto on an exchange, the exchange controls it. Hacks, fraud, and exchange failures (like FTX in 2022, which lost $8 billion in customer funds) can wipe out everything. True ownership means controlling your own private keys.

⚠️ WHAT CRYPTO IS NOT
- It is not a guaranteed investment
- It is not anonymous (blockchain transactions are traceable)
- It is not regulated like bank deposits — no FDIC protection
- It is not a quick path to wealth for most people

🌍 WHY IT MATTERS
Crypto introduces genuinely new financial technology: programmable money, borderless transfers without banks, digital ownership of assets. Whether you invest or not, understanding it is part of financial literacy in the 2020s.

Tip: Before investing in crypto, opening a separate savings account with that amount and letting it sit for 30 days is one approach that can help clarify your intent. If you still want to invest after 30 days, you're making a more thoughtful decision.

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Blockchain: The Technology Behind Crypto

⛓️ BLOCKCHAIN IN PLAIN ENGLISH

A blockchain is a public ledger — a record of every transaction — copied across thousands of computers simultaneously. No single company controls it.

🔗 HOW IT WORKS STEP BY STEP
1. You send 0.01 Bitcoin to a friend
2. That transaction is broadcast to thousands of computers (nodes) on the network
3. Those computers group your transaction with others into a "block"
4. The block is cryptographically sealed with a unique code (hash) that references the previous block — forming a chain
5. To change any record, you'd need to change every block after it AND do it faster than all the other computers — computationally impossible
6. The transaction is confirmed and permanent

🔐 WHY IT'S TRUSTLESS
Traditional databases are controlled by one company (a bank, PayPal, Visa). They can freeze accounts, reverse transactions, or fail.

Blockchain replaces trust in institutions with trust in mathematics. The rules are in the code — not subject to human decisions.

⚡ TWO MAJOR TYPES
Proof of Work (Bitcoin): Computers compete to solve complex math problems to validate transactions. Secure but uses enormous energy.

Proof of Stake (Ethereum since 2022): Validators lock up ("stake") their own crypto as collateral. Much more energy efficient — Ethereum reduced energy use by 99.9% with this switch.

📊 REAL-WORLD USES BEYOND MONEY
- Smart contracts: Self-executing contracts with terms in code (no lawyers needed)
- Supply chain tracking: Verifying product origin from farm to shelf
- Digital ownership: NFTs (Non-Fungible Tokens) proving ownership of digital items
- Voting systems: Tamper-proof digital voting (experimental)

Blockchain technology is likely more important than any single cryptocurrency built on top of it.

🌐 DEFI, NFTS AND WEB3 ARE DIFFERENT CLAIMS
DeFi uses smart contracts for services such as trading and lending; code failures and protocol risks differ from bank protections. An NFT identifies a token but does not by itself establish copyright or ownership of a physical item. Web3 describes approaches to user-controlled online assets and services, not a guarantee that a product is useful or decentralized. <a href="/modules/crypto-defi?lens=crypto&lesson=defi-1">Explore DeFi mechanisms and risks</a>; <a href="/modules/crypto-tokenization?lens=crypto&lesson=ctok-1">examine what a token legally represents</a>.

Tip: Think of blockchain like a Google Doc everyone can read but nobody can edit after it's locked. That permanence is both a strength and a consideration — mistakes on blockchain can't be undone.

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Bitcoin, Ethereum, and the Crypto Landscape

₿ THE THOUSANDS OF CRYPTOCURRENCIES — AND HOW TO MAKE SENSE OF THEM

There are over 20,000 cryptocurrencies. Most are worthless. A few matter significantly.

₿ BITCOIN (BTC) — DIGITAL GOLD
Created: 2009 by the pseudonymous Satoshi Nakamoto
Purpose: Peer-to-peer digital currency; store of value
Supply: Capped at 21 million — ever. Built-in scarcity unlike fiat currency
Market share: ~50% of total crypto market cap
Think of it as: Digital gold — a store of value and inflation hedge

Bitcoin halvings: Every ~4 years, the reward for mining Bitcoin is cut in half, reducing new supply. Historical halvings have preceded significant price increases.

⧫ ETHEREUM (ETH) — PROGRAMMABLE MONEY
Created: 2015 by Vitalik Buterin
Purpose: Platform for smart contracts and decentralized applications
Supply: No hard cap (but burning mechanism makes it deflationary)
Market share: ~15-20% of crypto market
Think of it as: The internet for crypto applications — a platform, not just currency

Ethereum processes billions in transactions via DeFi (decentralized finance) and smart contracts daily.

🎲 ALTCOINS — EVERYTHING ELSE
Altcoins (alternative coins) range from legitimate to outright fraud:

Established altcoins: Solana, Cardano, Polkadot — have real technology and use cases
Stablecoins: USDC, USDT — pegged to the dollar, useful for DeFi
Memecoins: Dogecoin, Shiba Inu — started as jokes, occasionally pump dramatically
Scam coins: Thousands created solely to steal money from investors

⚠️ THE ALTCOIN REALITY CHECK
90%+ of altcoins from the 2017 bull market are now worth essentially zero. Altcoin investing requires deep research and high risk tolerance — these are speculative assets, not investments.

📊 HOW TO THINK ABOUT THE LANDSCAPE
If you consider crypto: Bitcoin and Ethereum have the longest track records. Everything else requires significantly more research and carries substantially more risk.

⚠️ VOLATILITY AND A DECISION FRAMEWORK
Prices can move sharply as sentiment, liquidity, speculation and regulation change. Bitcoin, Ethereum and other tokens have different purposes and risks; popularity is not evidence of safety. Before participating, ask what the asset does, why it has value, who controls it and what could cause a permanent loss. Compare any exposure with emergency savings, expensive debt, diversified investments and your ability to lose the full amount. Choosing not to buy is a valid decision; no allocation fits everyone.

Tip: When someone describes a new cryptocurrency as heading to '100x' or 'moon,' that's worth pausing on. Legitimate investments typically don't require hype. Sticking to assets you understand and can research independently tends to be safer.

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How to Buy and Safely Store Crypto

🛒 BUYING CRYPTO THE RIGHT WAY

If you decide to invest, doing it safely is as important as investing at all. The crypto graveyard is full of cautionary tales about lost keys, exchange hacks, and irreversible mistakes.

✅ STEP 1: CHOOSE A REGULATED EXCHANGE
Use regulated exchanges with strong security records:
- Coinbase (US regulated, publicly traded company)
- Kraken (strong security track record)
- Gemini (US regulated, SOC 2 certified)

Avoid: Offshore exchanges with no US regulation, exchanges offering unusually high yields, platforms you found through social media ads.

✅ STEP 2: COMPLETE IDENTITY VERIFICATION (KYC)
Legitimate exchanges require ID verification. This isn't optional — it's legally required and protects you. If an exchange lets you trade without identity verification, that's a warning sign.

✅ STEP 3: SECURE YOUR ACCOUNT
- Enable two-factor authentication (2FA) — use an authenticator app, NOT SMS text messages
- Use a unique, long password stored in a password manager
- Never log in from public WiFi

🏦 STORAGE: THE CRITICAL DECISION

Hot wallet (exchange custody): Crypto stays on the exchange. Convenient but vulnerable to exchange hacks, failures, and freezes. FTX collapse wiped $8B of customer funds stored this way.

Software wallet: An app on your phone/computer. You control the keys. Better than an exchange, but online means some hack risk. Examples: MetaMask, Trust Wallet.

Hardware wallet: A physical device (like a USB drive) that stores your private keys offline. Virtually immune to online hacks. Examples: Ledger, Trezor. Recommended for any meaningful amount.

🔑 SEED PHRASE — THE MOST IMPORTANT THING TO PROTECT
When you create a self-custody wallet, you receive a 12 or 24-word seed phrase. This is the master key to your wallet.
- Write it on paper (never store digitally)
- Store in a fireproof, waterproof location
- Never share it with anyone — ever
- Consider multiple copies in separate locations

Lose your seed phrase = lose all crypto forever. No customer service. No recovery.

🚨 SCAMS, ACCESS AND CUSTODY
Guaranteed returns, urgent offers, impersonated support, fake giveaways and requests for a seed phrase are warning signs. Verify the service independently rather than following an unsolicited link. Exchange custody introduces counterparty risk; self-custody makes loss of keys or a seed phrase your responsibility. Understand address and network selection before transfers. Age and platform eligibility can constrain access for minors; do not bypass those requirements.

<a href="/modules/crypto-security?lens=traditional&lesson=csec-1">Compare custody choices and recovery responsibilities</a>.

Tip: A useful guideline many people consider: avoid storing more on an exchange than you're comfortable losing entirely. For amounts you plan to hold long-term, moving them to a hardware wallet within 30 days of purchase is an approach some people take.

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Crypto Taxes: What the IRS Wants to Know

💸 CRYPTO AND TAXES: WHAT MOST BEGINNERS DON'T KNOW

One of the most common mistakes new crypto investors make: not knowing that every sale, trade, and sometimes even use of crypto is a taxable event. Ignorance is not a defense with the IRS.

📋 HOW THE IRS CLASSIFIES CRYPTO
The IRS treats cryptocurrency as property — not currency. This means:
- Every sale creates a capital gain or loss
- Trading one crypto for another (Bitcoin → Ethereum) is a taxable event
- Using crypto to buy goods is a taxable event (selling at that price)
- Receiving crypto as income (mining, staking, payments) is ordinary income

💰 SHORT-TERM vs. LONG-TERM GAINS
Short-term (held < 1 year): Taxed as ordinary income — same rate as your salary (10–37%)
Long-term (held > 1 year): Taxed at capital gains rates — 0%, 15%, or 20% depending on income

Strategy: Holding crypto for over one year before selling can significantly reduce your tax bill.

📊 WHAT TO TRACK
For every transaction:
- Date of purchase
- Amount paid (cost basis)
- Date of sale
- Amount received
- Any fees paid

Exchanges like Coinbase generate tax forms (1099-B or 1099-DA in 2025+), but they don't always capture every transaction — especially if you've moved crypto between wallets.

🛠️ TOOLS THAT HELP
Crypto tax software (Koinly, TaxBit, CoinTracker) automatically imports transactions from exchanges and wallets, calculates gains/losses, and generates tax forms. These can be especially valuable if you have complex activity.

⚠️ CRYPTO LOSSES ARE VALUABLE
If you sold crypto at a loss, you can use those losses to offset gains (and up to $3,000 of ordinary income per year). Unlike stocks, there is currently NO wash-sale rule for crypto — you can sell, take the loss, and immediately rebuy. (Note: this rule may change; verify with a tax professional.)

📝 REPORTING REQUIREMENT
The IRS added a crypto question to Form 1040: "At any time during [year], did you receive, sell, or otherwise dispose of any digital asset?" This question is worth noting — many tax professionals advise that it applies even to holding activity. A tax professional can provide guidance specific to your situation.

📋 RECORDS AND CHANGING RULES
Keep transaction dates, quantities, values and cost-basis records rather than waiting until filing season. Selling, swapping and receiving some forms of crypto income can raise different tax questions. Rules, reporting obligations and a platform's legal availability can change; verify current requirements with primary sources and a qualified professional. Taxes do not disappear because a transaction happens on-chain.

Tip: Setting up a crypto tax software account (Koinly or TaxBit) early — not at tax time — can save effort later. Retroactively importing years of transactions is more complex than starting clean.

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