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

# Specifications

> Version: v0.53

This directory contains specifications for the modules of the Cosmos SDK as well as Interchain Standards (ICS) and other specifications.

Cosmos SDK applications hold this state in a Merkle store. Updates to the store may be made during transactions and at the beginning and end of every block.

## Cosmos SDK specifications[​](#cosmos-sdk-specifications "Direct link to Cosmos SDK specifications")

* [Store](/sdk/v0.53/build/spec/store/store) - The core Merkle store that holds the state.
* [Bech32](/sdk/v0.53/build/spec/addresses/bech32) - Address format for Cosmos SDK applications.

## Modules specifications[​](#modules-specifications "Direct link to Modules specifications")

Go the [module directory](/sdk/v0.53/build/modules/modules)

## CometBFT[​](#cometbft "Direct link to CometBFT")

For details on the underlying blockchain and p2p protocols, see the [CometBFT specification](https://github.com/cometbft/cometbft/tree/main/spec).