https://travis-ci.org/github/bitcoin/bitcoin/jobs/679885530#L8791
{
    
    const CScript& scriptPubKey = txout.scriptPubKey;
    SignatureData sigdata;
    std::unique_ptr<SigningProvider> provider = GetSolvingProvider(scriptPubKey);
    if (!provider) {
        
        return false;
    }
    if (!ProduceSignature(*provider, use_max_sig ? DUMMY_MAXIMUM_SIGNATURE_CREATOR : DUMMY_SIGNATURE_CREATOR, scriptPubKey, sigdata)) {
        return false;
    }
    UpdateInput(tx_in, sigdata);
    return true;
}
bool CWallet::DummySignTx(CMutableTransaction &txNew, const std::vector<CTxOut> &txouts, bool use_max_sig) const
{
    
    int nIn = 0;
    for (const auto& txout : txouts)
    {
        if (!DummySignInput(txNew.vin[nIn], txout, use_max_sig)) {
            return false;
        }
        nIn++;
    }
    return true;
}
bool CWallet::ImportScripts(const std::set<CScript> scripts, int64_t timestamp)