Blocks linked together
Transactions are grouped into blocks. Each block includes a reference to the one before it, forming a chronological chain.
Changing an old block would also change its reference, breaking the chain that follows it. This is one reason confirmed history becomes increasingly difficult to alter.
What the blockchain does not store
A blockchain entry is not a name, a bank balance, or a private key. It records transactions and the rules needed to validate them.
Your wallet helps you manage keys and create transactions. The blockchain helps the network agree which bitcoin can be spent.
Key Takeaways
The blockchain is a shared record of confirmed transactions.
Blocks are linked to previous blocks in chronological order.
Nodes independently verify the same history.
Private keys never belong on the blockchain.
Quick Quiz
What does a Bitcoin block mainly contain?
Continue Learning
Continue building your Bitcoin knowledge with these guides.
Ready to Learn More?
Whether you're completely new to Bitcoin or want help improving your security, we're here to help with practical, one-on-one guidance.