ExtractL1Fee attempts to extract L1Fee from the transaction L1Fee = L1GasPrice * ( L1GasUsed + 2100) * L1FeeScalar See https://community.optimism.io/docs/developers/build/transaction-fees/#the-l1-data-fee.

IsDepositTx returns true if the transaction is a deposit tx type.

ContractAddressKey is the key used to denote the contract address for a token, provided via Currency metadata.

MaxUncleDepth is the maximum depth for an uncle to be rewarded.

TransferEventTopic is the hash of the Transfer event: ERC-20: Transfer(address indexed _from, address indexed _to, uint256 _value) ERC-721: Transfer(address indexed _from, address indexed _to, uint256 indexed _tokenId).

UnclesRewardMultiplier is the uncle reward multiplier.

The BaseFeeVault predeploy receives the basefees on L2.

Block reward in wei for successfully mining a block upward from Byzantium.

Block reward in wei for successfully mining a block upward from Constantinople.

Block reward in wei for successfully mining a block.

The L1FeeVault predeploy receives the L1 portion of the transaction fees.

Ref: https://github.com/blockchain-etl/ethereum-etl/blob/25fc768f39d6a3175f8175d42b7699eb33166ebf/ethereumetl/mappers/trace_mapper.py#L151.