# block

URL: https://blockspace.wiki/glossary/block/

A batch of [transactions](https://blockspace.wiki/glossary/transaction/) added to Bitcoin's chain in one step. block.space's data-types reference gives a block's size as an 80-byte header, a count of its transactions, and the sum of their sizes. Consensus caps a block at 4,000,000 [weight units](https://blockspace.wiki/glossary/weight-unit/). The chain is every block from the genesis block forward.

Sources:

- block.space docs: data types · https://block.space/docs/datatypes
- block.space docs: BTI · https://block.space/docs/bti
- block.space docs: Blockspace Value Theory · https://block.space/docs/bvt

Updated: 2026-10-20