Blocks
Transactions are grouped into blocks. Each block contains data, a timestamp, and a reference to the block before it.
Crypto Basics · Lesson 3
Blockchain basics: the system behind crypto
A blockchain is a shared record of transactions maintained by a network instead of one central company. It is designed to make ownership, transfers, and history verifiable.
Chain
Blocks are linked together in order, creating a historical record that is difficult to rewrite once confirmed.
Network consensus
Participants agree on which transactions are valid using rules built into the network.
Why blockchains matter
Traditional databases are controlled by a central operator. A blockchain distributes the record across many participants. This makes it possible for users to verify balances, transactions, and network activity without needing to trust one private database.
Transactions
A transaction is a signed instruction, such as sending coins from one wallet to another.
Validators or miners
Network participants help confirm transactions and secure the chain depending on the consensus model.
Fees
Users usually pay network fees to have transactions processed and included in blocks.
Confirmations
Confirmations show how deeply a transaction has been included in the chain.
Proof of Work vs Proof of Stake
Proof of Work networks use computational work to secure the chain. Bitcoin is the best-known example. Proof of Stake networks use validators who lock assets as collateral to help secure the network. Both models aim to make dishonest behaviour expensive and network agreement reliable.
Public ledgers and transparency
Most major blockchains are public. This means users can inspect transactions, wallet balances, smart contracts, token transfers, and network activity through block explorers. This transparency is one reason crypto markets can be analysed differently from traditional markets.
What blockchains do not solve
A blockchain can verify ownership and transaction history, but it does not automatically make a project safe, valuable, or legitimate. Bad tokens, weak apps, scams, poor liquidity, and risky smart contracts can still exist on real blockchains.
Apply this in real market conditions
Use Coinstrooper’s live market tools to connect this lesson with real crypto data.
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