signing

type EIP712Domain struct {
	Name              string   `json:"name"`
	Version           string   `json:"version"`
	VerifyingContract string   `json:"verifyingContract"`
	ChainId           *big.Int `json:"chainId"`
	Salt              []byte   `json:"salt"`
}

type EIP712MessageBuilder[T any] struct {
	Types       map[string][]*EIP712Type
	PrimaryType string
	Domain      *EIP712Domain
}

type EIP712Type struct {
	Name string
	Type string
}

type EIP712TypedData struct {
	Types       map[string][]*EIP712Type `json:"types"`
	PrimaryType string                   `json:"primaryType"`
	Domain      *EIP712Domain            `json:"domain"`
	Message     map[string]interface{}   `json:"message"`
}