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pezkuwi-subxt/polkadot/roadmap/implementers-guide/src/node/utility/chain-api.md
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Andronik Ordian d00bdfef08 chain-api subsystem: implement BlockHeader messsage (#1778) 
* chain-api subsystem: implement BlockHeader messsage

* update the guide
2020-10-06 16:46:54 +02:00

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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
  • Finalized block number to hash
  • Last finalized block number
  • Ancestors
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