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Unverified Commit d05518f5 authored by Vedhavyas Singareddi's avatar Vedhavyas Singareddi Committed by GitHub
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define block hash provider and default impl using frame_system (#4080) 

This PR introduces `BlockHashProvider` into `pallet_mmr::Config`
This type is used to get `block_hash` for a given `block_number` rather
than directly using `frame_system::Pallet::block_hash`

The `DefaultBlockHashProvider` uses `frame_system::Pallet::block_hash`
to get the `block_hash`

Closes: #4062
parent 39b1f50f
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