laconicd/docs/basics/transactions.md

Transactions

Routing

Ethermint needs to parse and handle transactions routed for both the EVM and for the Cosmos hub. We attempt to achieve this by mimicking geth's Transaction structure and treat it as a unique Cosmos SDK message type. An Ethereum transaction is a single sdk.Msg. All relevant Ethereum transaction information is contained in this message. This includes the signature, gas, payload, amount, etc.

Being that Ethermint implements the Tendermint ABCI application interface, as transactions are consumed, they are passed through a series of handlers. Once such handler, the AnteHandler, is responsible for performing preliminary message execution business logic such as fee payment, signature verification, etc. This is particular to Cosmos SDK routed transactions. Ethereum routed transactions will bypass this as the EVM handles the same business logic.

All EVM transactions are RLP encoded using a custom tx encoder.

Signers

The signature processing and verification in Ethereum is performed by the Signer interface. The protocol supports different signer types based on the chain configuration params and the block number.

+++ https://github.com/ethereum/go-ethereum/blob/v1.10.3/core/types/transaction_signing.go#L145-L166

Ethermint supports all Ethereum Signers up to the latest go-ethereum version (London, Berlin, EIP155, Homestead and Frontier). The chain will generate the latest Signer type depending on the ChainConfig.

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