# Functions
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.
CalcBaseFee calculates the basefee of the header.
CalcBlobFee calculates the blobfee from the header's excess data gas field.
VerifyDAOHeaderExtraData validates the extra-data field of a block header to ensure it conforms to DAO hard-fork rules.
VerifyEip1559Header verifies some header attributes which were changed in EIP-1559, - gas limit check - basefee check.
VerifyGaslimit verifies the header gas limit according increase/decrease in relation to the parent gas limit.
# Variables
ErrBadNoDAOExtra is returned if a header does support the DAO fork on a no- fork client.
ErrBadProDAOExtra is returned if a header doesn't support the DAO fork on a pro-fork client.