https://cirrus-ci.com/task/5603470202896384?logs=ci#L2681
{
    if (m_spk_managers.count(id) > 0) {
        return m_spk_managers.at(id).get();
    }
    return nullptr;
}
stdunique_ptr<SigningProvider> CWalletGetSolvingProvider(const CScript& script) const
{
    SignatureData sigdata;
    return GetSolvingProvider(script, sigdata);
}
stdunique_ptr<SigningProvider> CWalletGetSolvingProvider(const CScript& script, SignatureData& sigdata) const
{
    for (const auto& spk_man_pair  m_spk_managers) {
        if (spk_man_pair.second->CanProvide(script, sigdata)) {
            return spk_man_pair.second->GetSolvingProvider(script);
        }
    }
    return nullptr;
}
stdvector<WalletDescriptor> CWalletGetWalletDescriptors(const CScript& script) const
{
    stdvector<WalletDescriptor> descs;
    for (const auto spk_man GetScriptPubKeyMans(script)) {
        if (const auto desc_spk_man = dynamic_cast<DescriptorScriptPubKeyMan*>(spk_man)) {
            LOCK(desc_spk_man->cs_desc_man);
            descs.push_back(desc_spk_man->GetWalletDescriptor());
        }
    }
    return descs;