laconicd-deprecated/x/evm/spec/04_messages.md
Federico Kunze 6000ab2098
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# Messages
## MsgEthereumTx
An EVM state transition can be achieved by using the `MsgEthereumTx`. This message encapsulates an
Ethereum transaction as an SDK message and contains the necessary transaction data fields.
One remark about the `MsgEthereumTx` is that it implements both the [`sdk.Msg`](https://github.com/cosmos/cosmos-sdk/blob/v0.39.2/types/tx_msg.go#L7-L29) and [`sdk.Tx`](https://github.com/cosmos/cosmos-sdk/blob/v0.39.2/types/tx_msg.go#L33-L41)
interfaces (generally SDK messages only implement the former, while the latter is a group of
messages bundled together). The reason of this, is because the `MsgEthereumTx` must not be included in a [`auth.StdTx`](https://github.com/cosmos/cosmos-sdk/blob/v0.39.2/x/auth/types/stdtx.go#L23-L30) (SDK's standard transaction type) as it performs gas and fee checks using the Ethereum logic from Geth instead of the Cosmos SDK checks done on the `auth` module `AnteHandler`.
+++ https://github.com/tharsis/ethermint/blob/v0.3.1/x/evm/types/msg.go#L117-L124
+++ https://github.com/tharsis/ethermint/blob/v0.3.1/x/evm/types/tx_data.go#L12-L29
This message validation is expected to fail if:
- `Data.Price` (i.e gas price) is ≤ 0.
- `Data.Amount` is negative
The transaction execution is expected to fail if:
- Any of the custom `AnteHandler` Ethereum decorators checks fail:
- Minimum gas amount requirements for transaction
- Tx sender account doesn't exist or hasn't enough balance for fees
- Account sequence doesn't match the transaction `Data.AccountNonce`
- Message signature verification fails
- EVM contract creation (i.e `evm.Create`) fails, or `evm.Call` fails