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Add subxt-historic crate for accesing historic (non head-of-chain) blocks (#2040)

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* WIP subxt-historic

* WIP subxt-historic

* WIP subxt-historic; flesh out basic foundations

* WIP filling in extrinsic decoding functionality

* iter and decode transaction extensions

* Fill in the Online/OfflineClient APIs and move more things to be part of the chain Config

* WIP storage

* clippy, fmt, finish extrinsics example

* prep for 0.0.1 release to claim crate name

* fix README link

* fmt

* WIP thinking about storage APIs

* WIP working out storage APIs

* Storage plain value fetching first pass

* WIP storage: first pass iterating over values done

* First apss finishing storage APIs

* fmt and clippy

* Create a storage example showing fetch and iteration

* Bump to frame-decode 0.9.0

* Bump subxt-historic to 0.0.3 for preview release

* Remove unused deps

* fix import

* clippy

* doc fixes

* tweak CI and fix some cargo hack findings

* Update README: subxt-historic is prerelease
This commit is contained in:
James Wilson
2025-08-26 17:56:21 +01:00
committed by GitHub
parent 23f3ebe6b5
commit 3aabd6dc09
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historic/README.md
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# subxt-historic
**This create is a work in progress and currently is released only as a preview.**
While `subxt` is a library for working at the head of a chain (submitting transactions and obtaining the current state), `subxt-historic` is a library for decoding blocks and state that are anywhere in a chain. To broadly summarize the differences:
| Feature | subxt | subxt-historic |
|-----------------------------------------|------------------------------|-------------------------------|
| Block access | Head of chain | Any block in chain |
| Connection to chain | Light client or RPC node | Archive RPC nodes only |
| Transaction submission | Yes | No |
| Metadata compatibility | V14 and newer | Any version |
# Examples
See the [examples](https://github.com/paritytech/subxt/tree/master/historic/examples) folder for examples of how to use `subxt-historic`.