Method ToNormalizedString

src/script/descriptor.cpp:423–480

        return true;
    }
    bool ToNormalizedString(const SigningProvider& arg, std::string& out, const DescriptorCache* cache) const override
    {
        // For hardened derivation type, just return the typical string, nothing to normalize
        if (m_derive == DeriveType::HARDENED) {
            out = ToString();
            return true;
        }
        // Step backwards to find the last hardened step in the path
        int i = (int)m_path.size() - 1;
        for (; i >= 0; --i) {
            if (m_path.at(i) >> 31) {
                break;
            }
        }
        // Either no derivation or all unhardened derivation
        if (i == -1) {
            out = ToString();
            return true;
        }
        // Get the path to the last hardened stup
        KeyOriginInfo origin;
        int k = 0;
        for (; k <= i; ++k) {
            // Add to the path
            origin.path.push_back(m_path.at(k));
        }
        // Build the remaining path
        KeyPath end_path;
        for (; k < (int)m_path.size(); ++k) {
            end_path.push_back(m_path.at(k));
        }
        // Get the fingerprint
        CKeyID id = m_root_extkey.pubkey.GetID();
        std::copy(id.begin(), id.begin() + 4, origin.fingerprint);

        CExtPubKey xpub;
        CExtKey lh_xprv;
        // If we have the cache, just get the parent xpub
        if (cache != nullptr) {
            cache->GetCachedLastHardenedExtPubKey(m_expr_index, xpub);
        }
        if (!xpub.pubkey.IsValid()) {
            // Cache miss, or nor cache, or need privkey
            CExtKey xprv;
            if (!GetDerivedExtKey(arg, xprv, lh_xprv)) return false;
            xpub = lh_xprv.Neuter();
        }
        assert(xpub.pubkey.IsValid());

        // Build the string
        std::string origin_str = HexStr(origin.fingerprint) + FormatHDKeypath(origin.path);
        out = "[" + origin_str + "]" + EncodeExtPubKey(xpub) + FormatHDKeypath(end_path);
        if (IsRange()) {
            out += "/*";
            assert(m_derive == DeriveType::UNHARDENED);
        }
        return true;
    }