What is Block?
A batch of transactions appended to the chain, with a header that links it backwards.
Blocks commit transactions together. Each block's header hashes the previous one, so changing an old block requires redoing all the work after it.
Block time and block space determine how fast a chain settles and how much it can carry.
Related terms
- Hash rateOn-chain
The total computing power securing a proof-of-work chain.
- Consensus mechanismBasics
The rule that decides which version of a chain's history is correct — proof of work or proof of stake.
- Genesis blockBasics
The first block of a blockchain, the anchor every later block traces back to.