Cryptocurrency is a type of digital money that uses cryptography and computer networks instead of a central bank. Blockchain is the record-keeping system that makes many cryptocurrencies possible. Students need this cheat sheet because crypto appears in investing, payments, online scams, and financial news.
Understanding the basics helps students evaluate risks before using or buying digital assets.
The core ideas are decentralization, public transaction records, private key security, and price volatility. A blockchain groups transactions into blocks that are linked together in order. Cryptocurrency value can change quickly because price depends on supply, demand, news, regulation, and investor behavior.
Safe financial decisions require comparing potential returns with fees, taxes, scams, and the risk of losing money.
Key Facts
- Cryptocurrency is digital currency secured by cryptography and usually recorded on a blockchain.
- A blockchain is a shared ledger where each block contains transaction data, a timestamp, and a link to the previous block.
- Profit or loss from selling crypto is calculated as profit or loss = selling price - purchase price - fees.
- Percent return is calculated as percent return = (profit or loss / original investment) x 100.
- Market value of a crypto holding is calculated as value = number of coins or tokens x current price per coin or token.
- A public key or wallet address can be shared to receive crypto, but a private key must be kept secret to control the funds.
- Transaction fees reduce returns, so net amount received = sale proceeds - transaction fees.
- Cryptocurrency is high risk because prices can be very volatile, transactions are often irreversible, and scams are common.
Vocabulary
- Cryptocurrency
- A digital asset used as money or investment that is secured by cryptography and usually operates on a decentralized network.
- Blockchain
- A digital ledger that stores transactions in linked blocks shared across many computers.
- Wallet
- A tool that stores the public and private keys needed to send, receive, and manage cryptocurrency.
- Private Key
- A secret code that proves ownership of cryptocurrency and allows the owner to move it.
- Mining
- A process used by some blockchains where computers validate transactions and may earn newly created cryptocurrency as a reward.
- Volatility
- The degree to which an asset's price rises and falls over time.
Common Mistakes to Avoid
- Treating cryptocurrency as guaranteed profit is wrong because crypto prices can rise or fall sharply and investors can lose the full amount they put in.
- Sharing a private key or recovery phrase is wrong because anyone with that information can take control of the wallet and move the funds.
- Ignoring transaction fees is wrong because fees lower the net gain from a sale and can make small trades unprofitable.
- Assuming every crypto project is legitimate is wrong because fake coins, phishing sites, pump-and-dump schemes, and impersonation scams are common.
- Forgetting taxes and record keeping is wrong because selling, trading, or earning crypto may create taxable events that require accurate records.
Practice Questions
- 1 You buy 0.5 bitcoin at 25 fee. What is your total cost?
- 2 You buy a token for 260 with $10 in total fees. What is your profit and percent return?
- 3 A student owns 150 tokens currently priced at $1.80 each. What is the market value of the holding?
- 4 Explain why losing a private key can be more serious than forgetting the password to a regular bank account.