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pezkuwi-subxt/polkadot/roadmap/implementers-guide/src/node/utility/chain-api.md
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Chevdor a30092ab42 Markdown linter (#1309) 
* Add markdown linting

- add linter default rules
- adapt rules to current code
- fix the code for linting to pass
- add CI check

fix #1243

* Fix markdown for Substrate
* Fix tooling install
* Fix workflow
* Add documentation
* Remove trailing spaces
* Update .github/.markdownlint.yaml

Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
* Fix mangled markdown/lists
* Fix captalization issues on known words
2023-09-04 12:02:32 +03:00

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Chain API

The Chain API subsystem is responsible for providing a single point of access to chain state data via a set of pre-determined queries.

Protocol

Input: ChainApiMessage

Output: None

Functionality

On receipt of ChainApiMessage, answer the request and provide the response to the side-channel embedded within the request.

Currently, the following requests are supported:

  • Block hash to number
  • Block hash to header
  • Block weight
  • Finalized block number to hash
  • Last finalized block number
  • Ancestors
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