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FetchBlocks returns the raw serialized bytes for the blocks identified by the given hashes. The raw bytes are in the format returned by Serialize on a wire.MsgBlock.

Returns the following errors as required by the interface contract:

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

In addition, returns ErrDriverSpecific if any failures occur when reading the block files.

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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