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Since blocks will interleave around round change, we will probably need
to verify blocks at previous round.
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In dexon, we don't "mine" and the blockchain won't and shouldn't fork, so
there is no difficulty concept, just replace it with block number.
Note: this commit only replace total difficulty related logic and code
in dex, dex/downloader package.
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Also rename InsertChain2, insertChain2, InsertHeaderChain2,
ValidateHeaderChain2
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We need governance state to verify block's signature (randomness),
but in ethereum fast sync mode, eth downloader only downloads the whole
state of pivot block, so we don't have governance state to verify the
downloaded block that is before pivot block if we don't processing
transaction.
To avoid running transactions, dex downloader also downloads the
governance state (merkle proof and storage) at snapshot height of each round,
so that we can verify blocks in fast sync mode.
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