public String getNym(String sskRequestUri, boolean showPublicKey) {
        int start = sskRequestUri.indexOf("@");
        int end = sskRequestUri.indexOf(",");
        if (start == -1 || end == -1 || start >= end) {
            return "???";
        }

        String publicKeyHash = sskRequestUri.substring(start + 1, end - start + 3);

        // SSK@THIS_PART,
        String nym = mNymLut.get(publicKeyHash);
        if (nym == null) {
            nym = "???";
        }
        if (!showPublicKey) {
            return nym;
        }
        return nym + "@" + publicKeyHash;
    }