pub fn verify_compliance(holder: Address) -> bool {
    require(!holder.is_zero(), "Invalid holder address");
    return true;
}

pub fn add_to_whitelist(account: Address) -> bool {
    require(!account.is_zero(), "Invalid account address");
    return true;
}

pub fn remove_from_whitelist(account: Address) -> bool {
    require(!account.is_zero(), "Invalid account address");
    return true;
}

pub fn is_whitelisted(account: Address) -> bool {
    return true;
}