laconicd-deprecated/x/evm/spec/08_params.md
2021-12-10 20:15:17 +01:00

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# 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](notion://www.notion.so/docs/basics/photon.md)** (used on the Evmos 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`.
::: tip
Note: 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 (**[EIPs](https://ethereum.org/en/eips/)**)
on the Ethereum VM `Config` that apply custom jump tables.
::: tip
NOTE: some of these EIPs are already enabled by the chain configuration, depending on the hard fork number.
:::
The supported activateable EIPS are:
- **[EIP 1344](https://eips.ethereum.org/EIPS/eip-1344)**
- **[EIP 1884](https://eips.ethereum.org/EIPS/eip-1884)**
- **[EIP 2200](https://eips.ethereum.org/EIPS/eip-2200)**
- **[EIP 2315](https://eips.ethereum.org/EIPS/eip-2315)**
- **[EIP 2929](https://eips.ethereum.org/EIPS/eip-2929)**
- **[EIP 3198](https://eips.ethereum.org/EIPS/eip-3198)**
- **[EIP 3529](https://eips.ethereum.org/EIPS/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 |
| CatalystBlock | `nil` |
| LondonBlock | 0 |