eip712

type ExtensionOptionsWeb3Tx struct {
	// typed_data_chain_id is used only in EIP712 Domain and should match
	// Ethereum network ID in a Web3 provider (e.g. Metamask).
	TypedDataChainID uint64 `protobuf:"varint,1,opt,name=typed_data_chain_id,json=typedDataChainId,proto3" json:"typedDataChainID,omitempty"`
	// fee_payer is an account address for the fee payer. It will be validated
	// during EIP712 signature checking.
	FeePayer string `protobuf:"bytes,2,opt,name=fee_payer,json=feePayer,proto3" json:"feePayer,omitempty"`
	// fee_payer_sig is a signature data from the fee paying account,
	// allows to perform fee delegation when using EIP712 Domain.
	FeePayerSig []byte `protobuf:"bytes,3,opt,name=fee_payer_sig,json=feePayerSig,proto3" json:"feePayerSig,omitempty"`
}

type FeeDelegationOptions struct {
	FeePayer sdk.AccAddress
}