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FetchBlockHeaders returns the raw serialized bytes for the block headers identified by the given hashes. The raw bytes are in the format returned by Serialize on a wire.BlockHeader.

Returns the following errors as required by the interface contract:

- ErrBlockNotFound if the any of the requested block hashes do not exist
- ErrTxClosed if the transaction has already been closed
- ErrCorruption if the database has somehow become corrupted

NOTE: The data returned by this function is only valid during a database transaction. Attempting to access it after a transaction has ended results in undefined behavior. This constraint prevents additional data copies and allows support for memory-mapped database implementations.

This function is part of the database.Tx interface implementation.

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