2022-07-21 07:14:29 +00:00
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# Ethereum
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### Addresses
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Ethereum addresses are 20-byte hashes.
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### In Instructions
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Ethereum In Instructions are present via being appended to the calldata
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transferring funds to Serai. `origin` is automatically set to the party from
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which funds are being transferred. For an ERC20, this is `from`. For ETH, this
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is the caller. `data` is limited to 255 bytes.
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### Out Instructions
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`data` is limited to 255 bytes.
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2022-07-21 08:06:29 +00:00
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If `data` is provided, the Ethereum Router will call a contract-calling child
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contract in order to sandbox it. The first byte of `data` designates which child
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child contract to call. After this byte is read, `data` is solely considered as
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`data`, post its first byte. The child contract is sent the funds before this
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call is performed.
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##### Child Contract 0
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This contract is intended to enable connecting with other protocols, and should
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be used to convert withdrawn assets to other assets on Ethereum.
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1) Transfers the asset to `destination`.
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2) Calls `destination` with `data`.
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##### Child Contract 1
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This contract is intended to enable authenticated calls from Serai.
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1) Transfers the asset to `destination`.
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2) Calls `destination` with `data[.. 4], serai_address, data[4 ..]`, where
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`serai_address` is the address which triggered this Out Instruction.
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