> ## Documentation Index
> Fetch the complete documentation index at: https://cosmos-docs-sync-security-docs.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Block Structure

The CometBFT consensus engine records all agreements by 2/3+ of nodes
into a blockchain, which is replicated among all nodes. This blockchain is
accessible via various RPC endpoints, mainly `/block?height=` to get the full
block, as well as `/blockchain?minHeight=_&maxHeight=_` to get a list of
headers. But what exactly is stored in these blocks?

The [specification][data_structures] contains a detailed description of each
component—that's the best place to get started.

To dig deeper, check out the [types package documentation][types].

[data_structures]: https://github.com/cometbft/cometbft/blob/v0.38.x/spec/core/data_structures.md

[types]: https://pkg.go.dev/github.com/cometbft/cometbft/types