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var (
	// ErrBadProDAOExtra is returned if a header doesn't support the DAO fork on a
	// pro-fork client.
	ErrBadProDAOExtra = errors.New("bad DAO pro-fork extra-data")

	// ErrBadNoDAOExtra is returned if a header does support the DAO fork on a no-
	// fork client.
	ErrBadNoDAOExtra = errors.New("bad DAO no-fork extra-data")


func ApplyDAOHardFork

func ApplyDAOHardFork(statedb *state.StateDB)

    ApplyDAOHardFork modifies the state database according to the DAO hard-fork rules, transferring all balances of a set of DAO accounts to a single refund contract.

    func VerifyDAOHeaderExtraData

    func VerifyDAOHeaderExtraData(config *params.ChainConfig, header *types.Header) error

      VerifyDAOHeaderExtraData validates the extra-data field of a block header to ensure it conforms to DAO hard-fork rules.

      DAO hard-fork extension to the header validity:

      a) if the node is no-fork, do not accept blocks in the [fork, fork+10) range
         with the fork specific extra-data set
      b) if the node is pro-fork, require blocks in the specific range to have the
         unique extra-data set.

      func VerifyForkHashes

      func VerifyForkHashes(config *params.ChainConfig, header *types.Header, uncle bool) error

        VerifyForkHashes verifies that blocks conforming to network hard-forks do have the correct hashes, to avoid clients going off on different chains. This is an optional feature.


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