Parameters

The evm module contains the following parameters:

Params

Key	Type	Default Value
EVMDenom	string	"aphoton"
EnableCreate	bool	true
EnableCall	bool	true
ExtraEIPs	[]int	TBD
ChainConfig	ChainConfig	See ChainConfig

EVM denom

The evm denomination parameter defines the token denomination used on the EVM state transitions and gas consumption for EVM messages.

For example, on Ethereum, the evm_denom would be ETH. In the case of Ethermint, the default denomination is the atto photon (used on the BlockX testnets). In terms of precision, the PHOTON and ETH share the same value, i.e 1 PHOTON = 10^18 atto photon and 1 ETH = 10^18 wei.

SDK applications that want to import the EVM module as a dependency will need to set their own evm_denom (i.e not "aphoton").

Enable Create

The enable create parameter toggles state transitions that use the vm.Create function. When the parameter is disabled, it will prevent all contract creation functionality.

Enable Transfer

The enable transfer toggles state transitions that use the vm.Call function. When the parameter is disabled, it will prevent transfers between accounts and executing a smart contract call.

Extra EIPs

The extra EIPs parameter defines the set of activateable Ethereum Improvement Proposals) on the Ethereum VM Config that apply custom jump tables.

Note that some of these EIPs are already enabled by the chain configuration, depending on the hard fork number.

The supported activateable EIPS are:

• EIP 1344
• EIP 1884
• EIP 2200
• EIP 2315
• EIP 2929
• EIP 3198
• EIP 3529

Chain Config

The ChainConfig is a protobuf wrapper type that contains the same fields as the go-ethereum ChainConfig parameters, but using *sdk.Int types instead of *big.Int.

By default, all block configuration fields but ConstantinopleBlock, are enabled at genesis (height 0).

ChainConfig Defaults

Name	Default Value
HomesteadBlock	0
DAOForkBlock	0
DAOForkSupport	true
EIP150Block	0
EIP150Hash	0x0000000000000000000000000000000000000000000000000000000000000000
EIP155Block	0
EIP158Block	0
ByzantiumBlock	0
ConstantinopleBlock	0
PetersburgBlock	0
IstanbulBlock	0
MuirGlacierBlock	0
BerlinBlock	0
LondonBlock	0