πΈ What is a Block?
A block is a container of data in a blockchain network. Each block typically contains:
A timestamp
A list of transactions
A reference (hash) to the previous block
A nonce (used in mining)
The block’s hash
π The Chain
Each block is linked to the previous one using hashes. This chain-like structure is what gives blockchain its name.
π₯οΈ Nodes
Nodes are individual computers that participate in the blockchain network. They:
Store a copy of the entire blockchain
Validate and relay transactions
Help reach consensus