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ed25519_verify: Support using dalek for historical blocks (paritytech…
…#12661) * ed25519_verify: Support using dalek for historical blocks The switch from `ed25519-dalek` to `ed25519-zebra` was actually a breaking change. `ed25519-zebra` is more permissive. To support historical blocks when syncing a chain this pull request introduces an externalities extension `UseDalekExt`. This extension is just used as a signaling mechanism to `ed25519_verify` to use `ed25519-dalek` when it is present. Together with `ExtensionBeforeBlock` it can be used to setup a node in way to sync historical blocks that require `ed25519-dalek`, because they included a transaction that verified differently as when using `ed25519-zebra`. This feature can be enabled in the following way. In the chain service file, directly after the client is created, the following code should be added: ``` use sc_client_api::ExecutorProvider; client.execution_extensions().set_extensions_factory( sc_client_api::execution_extensions::ExtensionBeforeBlock::<Block, sp_io::UseDalekExt>::new(BLOCK_NUMBER_UNTIL_DALEK_SHOULD_BE_USED) ); ``` * Fix doc * More fixes * Update client/api/src/execution_extensions.rs Co-authored-by: André Silva <123550+andresilva@users.noreply.github.com> * Fix merge and warning * Fix docs Co-authored-by: André Silva <123550+andresilva@users.noreply.github.com>
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