2020-07-02 08:22:45 +00:00
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order: 2
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-->
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# Transactions
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## Routing
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Ethermint needs to parse and handle transactions routed for both the EVM and for the Cosmos hub. We
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attempt to achieve this by mimicking [Geth's](https://github.com/ethereum/go-ethereum) `Transaction`
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structure and treat it as a unique Cosmos SDK message type. An Ethereum transaction is a single
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[`sdk.Msg`](https://godoc.org/github.com/cosmos/cosmos-sdk/types#Msg) contained in an
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[`auth.StdTx`](https://godoc.org/github.com/cosmos/cosmos-sdk/x/auth#StdTx). All relevant Ethereum
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transaction information is contained in this message. This includes the signature, gas, payload,
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etc.
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Being that Ethermint implements the Tendermint ABCI application interface, as transactions are
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consumed, they are passed through a series of handlers. Once such handler, the `AnteHandler`, is
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responsible for performing preliminary message execution business logic such as fee payment,
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signature verification, etc. This is particular to Cosmos SDK routed transactions. Ethereum routed
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transactions will bypass this as the EVM handles the same business logic.
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Ethereum routed transactions coming from a web3 source are expected to be RLP encoded, however all
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internal interaction between Ethermint and Tendermint will utilize one of the supported encoding
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formats: Protobuf, Amino or Hybrid of the previous two.
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## Transaction formats
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<!-- TODO: -->
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- Cosmos transactions
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- Ethereum transaction
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## Signatures
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Ethermint supports [EIP-155](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-155.md)
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signatures. A `Transaction` is expected to have a single signature for Ethereum routed transactions.
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However, just as in Cosmos, Ethermint will support multiple signers for non-Ethereum transactions.
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Signatures over the `Transaction` type are identical to Ethereum and the signatures will not be
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duplicated in the embedding
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[`auth.StdTx`](https://godoc.org/github.com/cosmos/cosmos-sdk/x/auth#StdTx).
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## Next {hide}
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2020-07-06 16:56:02 +00:00
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Learn about how [gas](./gas.md) is used on Ethermint {hide}
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