Export comment on HDSeed and fingerprint with wallet

qa/rpc-tests/wallet_import_export.py

@@ -42,7 +42,9 @@ class WalletImportExportTest (BitcoinTestFramework):
 # Helper functions
 def parse_wallet_file(dump_path):
     file_lines = open(dump_path, "r").readlines()
-
+    # WE expect information about the HDSeed and fingerpring in the header
+    assert_true("HDSeed" in file_lines[4], "Expected HDSeed")
+    assert_true("fingerprint" in file_lines[4], "Expected fingerprint")
     (t_keys, i) = parse_wallet_file_lines(file_lines, 0)
     (sprout_keys, i) = parse_wallet_file_lines(file_lines, i)
     (sapling_keys, i) = parse_wallet_file_lines(file_lines, i)

src/wallet/rpcdump.cpp

@@ -502,6 +502,12 @@ UniValue dumpwallet_impl(const UniValue& params, bool fHelp, bool fDumpZKeys)
     file << strprintf("# * Created on %s\n", EncodeDumpTime(GetTime()));
     file << strprintf("# * Best block at time of backup was %i (%s),\n", chainActive.Height(), chainActive.Tip()->GetBlockHash().ToString());
     file << strprintf("#   mined on %s\n", EncodeDumpTime(chainActive.Tip()->GetBlockTime()));
+    {
+        HDSeed hdSeed;
+        pwalletMain->GetHDSeed(hdSeed);
+        file << strprintf("# HDSeed=%s fingerprint=%s", pwalletMain->GetHDChain().seedFp.GetHex(), hdSeed.Fingerprint().GetHex());
+        file << "\n";
+    }
     file << "\n";
     for (std::vector<std::pair<int64_t, CKeyID> >::const_iterator it = vKeyBirth.begin(); it != vKeyBirth.end(); it++) {
         const CKeyID &keyid = it->second;