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trait PermissionChecker<Permission> {
    pub fn check_permissions(instruction: ISI, authority: Id) -> Result<(), String>
}

Register<Permission, Account>: ISI

#[derive(Encode, Decode, Serialize, Deserialize)]
struct Account<Permission> {
    permissions: Vec<Permission>,
    account_data: 
    // .. other fields
}

struct Iroha<Permission, PC: PermissionChecker<Permission>> {
    pub checker: PC,
    // .. other fields
}

Iroha<Iroha1Permission, Iroha1PermissionChecker>

enum Iroha1Permission {

}

Pros

1. Customizable permissions check logic
2. Customizable permission type
3. Permission check logic is written in pure rust - which is a turing complete language and convinient convenient language while ISI ISIs are not yet there.
4. Faster than WASM
5. Does not introduce additional complexity as WASM does.

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