Merge #9108: Use importmulti timestamp when importing watch only keys (on top of #9682)

a80f98b Use importmulti timestamp when importing watch only keys (Russell Yanofsky)
a58370e Dedup nTimeFirstKey update logic (Russell Yanofsky)

qa/rpc-tests/importmulti.py

@@ -20,6 +20,7 @@ class ImportMultiTest (BitcoinTestFramework):
         print ("Mining blocks...")
         self.nodes[0].generate(1)
         self.nodes[1].generate(1)
+        timestamp = self.nodes[1].getblock(self.nodes[1].getbestblockhash())['mediantime']
 
         # keyword definition
         PRIV_KEY = 'privkey'
@@ -59,6 +60,9 @@ class ImportMultiTest (BitcoinTestFramework):
         address_assert = self.nodes[1].validateaddress(address['address'])
         assert_equal(address_assert['iswatchonly'], True)
         assert_equal(address_assert['ismine'], False)
+        assert_equal(address_assert['timestamp'], timestamp)
+        watchonly_address = address['address']
+        watchonly_timestamp = timestamp
 
 
         # ScriptPubKey + internal
@@ -73,6 +77,7 @@ class ImportMultiTest (BitcoinTestFramework):
         address_assert = self.nodes[1].validateaddress(address['address'])
         assert_equal(address_assert['iswatchonly'], True)
         assert_equal(address_assert['ismine'], False)
+        assert_equal(address_assert['timestamp'], timestamp)
 
         # ScriptPubKey + !internal
         print("Should not import a scriptPubKey without internal flag")
@@ -87,6 +92,7 @@ class ImportMultiTest (BitcoinTestFramework):
         address_assert = self.nodes[1].validateaddress(address['address'])
         assert_equal(address_assert['iswatchonly'], False)
         assert_equal(address_assert['ismine'], False)
+        assert_equal('timestamp' in address_assert, False)
 
 
         # Address + Public key + !Internal
@@ -103,6 +109,7 @@ class ImportMultiTest (BitcoinTestFramework):
         address_assert = self.nodes[1].validateaddress(address['address'])
         assert_equal(address_assert['iswatchonly'], True)
         assert_equal(address_assert['ismine'], False)
+        assert_equal(address_assert['timestamp'], timestamp)
 
 
         # ScriptPubKey + Public key + internal
@@ -119,6 +126,7 @@ class ImportMultiTest (BitcoinTestFramework):
         address_assert = self.nodes[1].validateaddress(address['address'])
         assert_equal(address_assert['iswatchonly'], True)
         assert_equal(address_assert['ismine'], False)
+        assert_equal(address_assert['timestamp'], timestamp)
 
         # ScriptPubKey + Public key + !internal
         print("Should not import a scriptPubKey without internal and with public key")
@@ -135,11 +143,11 @@ class ImportMultiTest (BitcoinTestFramework):
         address_assert = self.nodes[1].validateaddress(address['address'])
         assert_equal(address_assert['iswatchonly'], False)
         assert_equal(address_assert['ismine'], False)
+        assert_equal('timestamp' in address_assert, False)
 
         # Address + Private key + !watchonly
         print("Should import an address with private key")
         address = self.nodes[0].validateaddress(self.nodes[0].getnewaddress())
-        timestamp = self.nodes[1].getblock(self.nodes[1].getbestblockhash())['mediantime']
         result = self.nodes[1].importmulti([{
             "scriptPubKey": {
                 "address": address['address']
@@ -170,6 +178,7 @@ class ImportMultiTest (BitcoinTestFramework):
         address_assert = self.nodes[1].validateaddress(address['address'])
         assert_equal(address_assert['iswatchonly'], False)
         assert_equal(address_assert['ismine'], False)
+        assert_equal('timestamp' in address_assert, False)
 
         # ScriptPubKey + Private key + internal
         print("Should import a scriptPubKey with internal and with private key")
@@ -184,6 +193,7 @@ class ImportMultiTest (BitcoinTestFramework):
         address_assert = self.nodes[1].validateaddress(address['address'])
         assert_equal(address_assert['iswatchonly'], False)
         assert_equal(address_assert['ismine'], True)
+        assert_equal(address_assert['timestamp'], timestamp)
 
         # ScriptPubKey + Private key + !internal
         print("Should not import a scriptPubKey without internal and with private key")
@@ -199,6 +209,7 @@ class ImportMultiTest (BitcoinTestFramework):
         address_assert = self.nodes[1].validateaddress(address['address'])
         assert_equal(address_assert['iswatchonly'], False)
         assert_equal(address_assert['ismine'], False)
+        assert_equal('timestamp' in address_assert, False)
 
 
         # P2SH address
@@ -209,6 +220,7 @@ class ImportMultiTest (BitcoinTestFramework):
         self.nodes[1].generate(100)
         transactionid = self.nodes[1].sendtoaddress(multi_sig_script['address'], 10.00)
         self.nodes[1].generate(1)
+        timestamp = self.nodes[1].getblock(self.nodes[1].getbestblockhash())['mediantime']
         transaction = self.nodes[1].gettransaction(transactionid)
 
         print("Should import a p2sh")
@@ -222,6 +234,7 @@ class ImportMultiTest (BitcoinTestFramework):
         address_assert = self.nodes[1].validateaddress(multi_sig_script['address'])
         assert_equal(address_assert['isscript'], True)
         assert_equal(address_assert['iswatchonly'], True)
+        assert_equal(address_assert['timestamp'], timestamp)
         p2shunspent = self.nodes[1].listunspent(0,999999, [multi_sig_script['address']])[0]
         assert_equal(p2shunspent['spendable'], False)
         assert_equal(p2shunspent['solvable'], False)
@@ -235,6 +248,7 @@ class ImportMultiTest (BitcoinTestFramework):
         self.nodes[1].generate(100)
         transactionid = self.nodes[1].sendtoaddress(multi_sig_script['address'], 10.00)
         self.nodes[1].generate(1)
+        timestamp = self.nodes[1].getblock(self.nodes[1].getbestblockhash())['mediantime']
         transaction = self.nodes[1].gettransaction(transactionid)
 
         print("Should import a p2sh with respective redeem script")
@@ -246,6 +260,8 @@ class ImportMultiTest (BitcoinTestFramework):
             "redeemscript": multi_sig_script['redeemScript']
         }])
         assert_equal(result[0]['success'], True)
+        address_assert = self.nodes[1].validateaddress(multi_sig_script['address'])
+        assert_equal(address_assert['timestamp'], timestamp)
 
         p2shunspent = self.nodes[1].listunspent(0,999999, [multi_sig_script['address']])[0]
         assert_equal(p2shunspent['spendable'], False)
@@ -260,6 +276,7 @@ class ImportMultiTest (BitcoinTestFramework):
         self.nodes[1].generate(100)
         transactionid = self.nodes[1].sendtoaddress(multi_sig_script['address'], 10.00)
         self.nodes[1].generate(1)
+        timestamp = self.nodes[1].getblock(self.nodes[1].getbestblockhash())['mediantime']
         transaction = self.nodes[1].gettransaction(transactionid)
 
         print("Should import a p2sh with respective redeem script and private keys")
@@ -272,6 +289,8 @@ class ImportMultiTest (BitcoinTestFramework):
             "keys": [ self.nodes[0].dumpprivkey(sig_address_1['address']), self.nodes[0].dumpprivkey(sig_address_2['address'])]
         }])
         assert_equal(result[0]['success'], True)
+        address_assert = self.nodes[1].validateaddress(multi_sig_script['address'])
+        assert_equal(address_assert['timestamp'], timestamp)
 
         p2shunspent = self.nodes[1].listunspent(0,999999, [multi_sig_script['address']])[0]
         assert_equal(p2shunspent['spendable'], False)
@@ -319,6 +338,7 @@ class ImportMultiTest (BitcoinTestFramework):
         address_assert = self.nodes[1].validateaddress(address['address'])
         assert_equal(address_assert['iswatchonly'], False)
         assert_equal(address_assert['ismine'], False)
+        assert_equal('timestamp' in address_assert, False)
 
 
         # ScriptPubKey + Public key + internal + Wrong pubkey
@@ -338,6 +358,7 @@ class ImportMultiTest (BitcoinTestFramework):
         address_assert = self.nodes[1].validateaddress(address['address'])
         assert_equal(address_assert['iswatchonly'], False)
         assert_equal(address_assert['ismine'], False)
+        assert_equal('timestamp' in address_assert, False)
 
 
         # Address + Private key + !watchonly + Wrong private key
@@ -357,6 +378,7 @@ class ImportMultiTest (BitcoinTestFramework):
         address_assert = self.nodes[1].validateaddress(address['address'])
         assert_equal(address_assert['iswatchonly'], False)
         assert_equal(address_assert['ismine'], False)
+        assert_equal('timestamp' in address_assert, False)
 
 
         # ScriptPubKey + Private key + internal + Wrong private key
@@ -375,6 +397,15 @@ class ImportMultiTest (BitcoinTestFramework):
         address_assert = self.nodes[1].validateaddress(address['address'])
         assert_equal(address_assert['iswatchonly'], False)
         assert_equal(address_assert['ismine'], False)
+        assert_equal('timestamp' in address_assert, False)
+
+        # restart nodes to check for proper serialization/deserialization of watch only address
+        stop_nodes(self.nodes)
+        self.nodes = start_nodes(2, self.options.tmpdir)
+        address_assert = self.nodes[1].validateaddress(watchonly_address)
+        assert_equal(address_assert['iswatchonly'], True)
+        assert_equal(address_assert['ismine'], False)
+        assert_equal(address_assert['timestamp'], watchonly_timestamp);
 
         # Bad or missing timestamps
         print("Should throw on invalid or missing timestamp values")

src/rpc/misc.cpp

@@ -208,6 +208,9 @@ UniValue validateaddress(const JSONRPCRequest& request)
         if (pwalletMain) {
             const auto& meta = pwalletMain->mapKeyMetadata;
             auto it = address.GetKeyID(keyID) ? meta.find(keyID) : meta.end();
+            if (it == meta.end()) {
+                it = meta.find(CScriptID(scriptPubKey));
+            }
             if (it != meta.end()) {
                 ret.push_back(Pair("timestamp", it->second.nCreateTime));
                 if (!it->second.hdKeypath.empty()) {

src/wallet/rpcdump.cpp

@@ -143,7 +143,7 @@ UniValue importprivkey(const JSONRPCRequest& request)
             throw JSONRPCError(RPC_WALLET_ERROR, "Error adding key to wallet");
 
         // whenever a key is imported, we need to scan the whole chain
-        pwalletMain->nTimeFirstKey = 1; // 0 would be considered 'no value'
+        pwalletMain->UpdateTimeFirstKey(1);
 
         if (fRescan) {
             pwalletMain->ScanForWalletTransactions(chainActive.Genesis(), true);
@@ -161,7 +161,7 @@ void ImportScript(const CScript& script, const string& strLabel, bool isRedeemSc
 
     pwalletMain->MarkDirty();
 
-    if (!pwalletMain->HaveWatchOnly(script) && !pwalletMain->AddWatchOnly(script))
+    if (!pwalletMain->HaveWatchOnly(script) && !pwalletMain->AddWatchOnly(script, 0 /* nCreateTime */))
         throw JSONRPCError(RPC_WALLET_ERROR, "Error adding address to wallet");
 
     if (isRedeemScript) {
@@ -500,8 +500,7 @@ UniValue importwallet(const JSONRPCRequest& request)
     while (pindex && pindex->pprev && pindex->GetBlockTime() > nTimeBegin - 7200)
         pindex = pindex->pprev;
 
-    if (!pwalletMain->nTimeFirstKey || nTimeBegin < pwalletMain->nTimeFirstKey)
-        pwalletMain->nTimeFirstKey = nTimeBegin;
+    pwalletMain->UpdateTimeFirstKey(nTimeBegin);
 
     LogPrintf("Rescanning last %i blocks\n", chainActive.Height() - pindex->nHeight + 1);
     pwalletMain->ScanForWalletTransactions(pindex);
@@ -576,15 +575,17 @@ UniValue dumpwallet(const JSONRPCRequest& request)
     if (!file.is_open())
         throw JSONRPCError(RPC_INVALID_PARAMETER, "Cannot open wallet dump file");
 
-    std::map<CKeyID, int64_t> mapKeyBirth;
+    std::map<CTxDestination, int64_t> mapKeyBirth;
     std::set<CKeyID> setKeyPool;
     pwalletMain->GetKeyBirthTimes(mapKeyBirth);
     pwalletMain->GetAllReserveKeys(setKeyPool);
 
     // sort time/key pairs
     std::vector<std::pair<int64_t, CKeyID> > vKeyBirth;
-    for (std::map<CKeyID, int64_t>::const_iterator it = mapKeyBirth.begin(); it != mapKeyBirth.end(); it++) {
-        vKeyBirth.push_back(std::make_pair(it->second, it->first));
+    for (const auto& entry : mapKeyBirth) {
+        if (const CKeyID* keyID = boost::get<CKeyID>(&entry.first)) { // set and test
+            vKeyBirth.push_back(std::make_pair(entry.second, *keyID));
+        }
     }
     mapKeyBirth.clear();
     std::sort(vKeyBirth.begin(), vKeyBirth.end());
@@ -721,7 +722,7 @@ UniValue ProcessImport(const UniValue& data, const int64_t timestamp)
 
             pwalletMain->MarkDirty();
 
-            if (!pwalletMain->HaveWatchOnly(redeemScript) && !pwalletMain->AddWatchOnly(redeemScript)) {
+            if (!pwalletMain->HaveWatchOnly(redeemScript) && !pwalletMain->AddWatchOnly(redeemScript, timestamp)) {
                 throw JSONRPCError(RPC_WALLET_ERROR, "Error adding address to wallet");
             }
 
@@ -738,7 +739,7 @@ UniValue ProcessImport(const UniValue& data, const int64_t timestamp)
 
             pwalletMain->MarkDirty();
 
-            if (!pwalletMain->HaveWatchOnly(redeemDestination) && !pwalletMain->AddWatchOnly(redeemDestination)) {
+            if (!pwalletMain->HaveWatchOnly(redeemDestination) && !pwalletMain->AddWatchOnly(redeemDestination, timestamp)) {
                 throw JSONRPCError(RPC_WALLET_ERROR, "Error adding address to wallet");
             }
 
@@ -782,9 +783,7 @@ UniValue ProcessImport(const UniValue& data, const int64_t timestamp)
                         throw JSONRPCError(RPC_WALLET_ERROR, "Error adding key to wallet");
                     }
 
-                    if (timestamp < pwalletMain->nTimeFirstKey) {
-                        pwalletMain->nTimeFirstKey = timestamp;
-                    }
+                    pwalletMain->UpdateTimeFirstKey(timestamp);
                 }
             }
 
@@ -833,7 +832,7 @@ UniValue ProcessImport(const UniValue& data, const int64_t timestamp)
 
                 pwalletMain->MarkDirty();
 
-                if (!pwalletMain->HaveWatchOnly(pubKeyScript) && !pwalletMain->AddWatchOnly(pubKeyScript)) {
+                if (!pwalletMain->HaveWatchOnly(pubKeyScript) && !pwalletMain->AddWatchOnly(pubKeyScript, timestamp)) {
                     throw JSONRPCError(RPC_WALLET_ERROR, "Error adding address to wallet");
                 }
 
@@ -851,7 +850,7 @@ UniValue ProcessImport(const UniValue& data, const int64_t timestamp)
 
                 pwalletMain->MarkDirty();
 
-                if (!pwalletMain->HaveWatchOnly(scriptRawPubKey) && !pwalletMain->AddWatchOnly(scriptRawPubKey)) {
+                if (!pwalletMain->HaveWatchOnly(scriptRawPubKey) && !pwalletMain->AddWatchOnly(scriptRawPubKey, timestamp)) {
                     throw JSONRPCError(RPC_WALLET_ERROR, "Error adding address to wallet");
                 }
 
@@ -912,9 +911,7 @@ UniValue ProcessImport(const UniValue& data, const int64_t timestamp)
                     throw JSONRPCError(RPC_WALLET_ERROR, "Error adding key to wallet");
                 }
 
-                if (timestamp < pwalletMain->nTimeFirstKey) {
-                    pwalletMain->nTimeFirstKey = timestamp;
-                }
+                pwalletMain->UpdateTimeFirstKey(timestamp);
 
                 success = true;
             }
@@ -927,7 +924,7 @@ UniValue ProcessImport(const UniValue& data, const int64_t timestamp)
 
                 pwalletMain->MarkDirty();
 
-                if (!pwalletMain->HaveWatchOnly(script) && !pwalletMain->AddWatchOnly(script)) {
+                if (!pwalletMain->HaveWatchOnly(script) && !pwalletMain->AddWatchOnly(script, timestamp)) {
                     throw JSONRPCError(RPC_WALLET_ERROR, "Error adding address to wallet");
                 }
 

src/wallet/wallet.cpp

@@ -113,8 +113,7 @@ CPubKey CWallet::GenerateNewKey()
     assert(secret.VerifyPubKey(pubkey));
 
     mapKeyMetadata[pubkey.GetID()] = metadata;
-    if (!nTimeFirstKey || nCreationTime < nTimeFirstKey)
-        nTimeFirstKey = nCreationTime;
+    UpdateTimeFirstKey(nCreationTime);
 
     if (!AddKeyPubKey(secret, pubkey))
         throw std::runtime_error(std::string(__func__) + ": AddKey failed");
@@ -207,13 +206,11 @@ bool CWallet::AddCryptedKey(const CPubKey &vchPubKey,
     return false;
 }
 
-bool CWallet::LoadKeyMetadata(const CPubKey &pubkey, const CKeyMetadata &meta)
+bool CWallet::LoadKeyMetadata(const CTxDestination& keyID, const CKeyMetadata &meta)
 {
     AssertLockHeld(cs_wallet); // mapKeyMetadata
-    if (meta.nCreateTime && (!nTimeFirstKey || meta.nCreateTime < nTimeFirstKey))
-        nTimeFirstKey = meta.nCreateTime;
-
-    mapKeyMetadata[pubkey.GetID()] = meta;
+    UpdateTimeFirstKey(meta.nCreateTime);
+    mapKeyMetadata[keyID] = meta;
     return true;
 }
 
@@ -222,6 +219,18 @@ bool CWallet::LoadCryptedKey(const CPubKey &vchPubKey, const std::vector<unsigne
     return CCryptoKeyStore::AddCryptedKey(vchPubKey, vchCryptedSecret);
 }
 
+void CWallet::UpdateTimeFirstKey(int64_t nCreateTime)
+{
+    AssertLockHeld(cs_wallet);
+    if (nCreateTime <= 1) {
+        // Cannot determine birthday information, so set the wallet birthday to
+        // the beginning of time.
+        nTimeFirstKey = 1;
+    } else if (!nTimeFirstKey || nCreateTime < nTimeFirstKey) {
+        nTimeFirstKey = nCreateTime;
+    }
+}
+
 bool CWallet::AddCScript(const CScript& redeemScript)
 {
     if (!CCryptoKeyStore::AddCScript(redeemScript))
@@ -251,11 +260,18 @@ bool CWallet::AddWatchOnly(const CScript &dest)
 {
     if (!CCryptoKeyStore::AddWatchOnly(dest))
         return false;
-    nTimeFirstKey = 1; // No birthday information for watch-only keys.
+    const CKeyMetadata& meta = mapKeyMetadata[CScriptID(dest)];
+    UpdateTimeFirstKey(meta.nCreateTime);
     NotifyWatchonlyChanged(true);
     if (!fFileBacked)
         return true;
-    return CWalletDB(strWalletFile).WriteWatchOnly(dest);
+    return CWalletDB(strWalletFile).WriteWatchOnly(dest, meta);
+}
+
+bool CWallet::AddWatchOnly(const CScript& dest, int64_t nCreateTime)
+{
+    mapKeyMetadata[CScriptID(dest)].nCreateTime = nCreateTime;
+    return AddWatchOnly(dest);
 }
 
 bool CWallet::RemoveWatchOnly(const CScript &dest)
@@ -3416,14 +3432,16 @@ public:
     void operator()(const CNoDestination &none) {}
 };
 
-void CWallet::GetKeyBirthTimes(std::map<CKeyID, int64_t> &mapKeyBirth) const {
+void CWallet::GetKeyBirthTimes(std::map<CTxDestination, int64_t> &mapKeyBirth) const {
     AssertLockHeld(cs_wallet); // mapKeyMetadata
     mapKeyBirth.clear();
 
     // get birth times for keys with metadata
-    for (std::map<CKeyID, CKeyMetadata>::const_iterator it = mapKeyMetadata.begin(); it != mapKeyMetadata.end(); it++)
-        if (it->second.nCreateTime)
-            mapKeyBirth[it->first] = it->second.nCreateTime;
+    for (const auto& entry : mapKeyMetadata) {
+        if (entry.second.nCreateTime) {
+            mapKeyBirth[entry.first] = entry.second.nCreateTime;
+        }
+    }
 
     // map in which we'll infer heights of other keys
     CBlockIndex *pindexMax = chainActive[std::max(0, chainActive.Height() - 144)]; // the tip can be reorganized; use a 144-block safety margin

src/wallet/wallet.h

@@ -611,6 +611,20 @@ private:
     bool fFileBacked;
 
     std::set<int64_t> setKeyPool;
+
+    int64_t nTimeFirstKey;
+
+    /**
+     * Private version of AddWatchOnly method which does not accept a
+     * timestamp, and which will reset the wallet's nTimeFirstKey value to 1 if
+     * the watch key did not previously have a timestamp associated with it.
+     * Because this is an inherited virtual method, it is accessible despite
+     * being marked private, but it is marked private anyway to encourage use
+     * of the other AddWatchOnly which accepts a timestamp and sets
+     * nTimeFirstKey more intelligently for more efficient rescans.
+     */
+    bool AddWatchOnly(const CScript& dest) override;
+
 public:
     /*
      * Main wallet lock.
@@ -635,7 +649,9 @@ public:
             mapKeyMetadata[keyid] = CKeyMetadata(keypool.nTime);
     }
 
-    std::map<CKeyID, CKeyMetadata> mapKeyMetadata;
+    // Map from Key ID (for regular keys) or Script ID (for watch-only keys) to
+    // key metadata.
+    std::map<CTxDestination, CKeyMetadata> mapKeyMetadata;
 
     typedef std::map<unsigned int, CMasterKey> MasterKeyMap;
     MasterKeyMap mapMasterKeys;
@@ -688,8 +704,6 @@ public:
 
     std::set<COutPoint> setLockedCoins;
 
-    int64_t nTimeFirstKey;
-
     const CWalletTx* GetWalletTx(const uint256& hash) const;
 
     //! check whether we are allowed to upgrade (or already support) to the named feature
@@ -727,9 +741,10 @@ public:
     //! Adds a key to the store, without saving it to disk (used by LoadWallet)
     bool LoadKey(const CKey& key, const CPubKey &pubkey) { return CCryptoKeyStore::AddKeyPubKey(key, pubkey); }
     //! Load metadata (used by LoadWallet)
-    bool LoadKeyMetadata(const CPubKey &pubkey, const CKeyMetadata &metadata);
+    bool LoadKeyMetadata(const CTxDestination& pubKey, const CKeyMetadata &metadata);
 
     bool LoadMinVersion(int nVersion) { AssertLockHeld(cs_wallet); nWalletVersion = nVersion; nWalletMaxVersion = std::max(nWalletMaxVersion, nVersion); return true; }
+    void UpdateTimeFirstKey(int64_t nCreateTime);
 
     //! Adds an encrypted key to the store, and saves it to disk.
     bool AddCryptedKey(const CPubKey &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret);
@@ -748,7 +763,7 @@ public:
     bool GetDestData(const CTxDestination &dest, const std::string &key, std::string *value) const;
 
     //! Adds a watch-only address to the store, and saves it to disk.
-    bool AddWatchOnly(const CScript &dest);
+    bool AddWatchOnly(const CScript& dest, int64_t nCreateTime);
     bool RemoveWatchOnly(const CScript &dest);
     //! Adds a watch-only address to the store, without saving it to disk (used by LoadWallet)
     bool LoadWatchOnly(const CScript &dest);
@@ -757,7 +772,7 @@ public:
     bool ChangeWalletPassphrase(const SecureString& strOldWalletPassphrase, const SecureString& strNewWalletPassphrase);
     bool EncryptWallet(const SecureString& strWalletPassphrase);
 
-    void GetKeyBirthTimes(std::map<CKeyID, int64_t> &mapKeyBirth) const;
+    void GetKeyBirthTimes(std::map<CTxDestination, int64_t> &mapKeyBirth) const;
 
     /** 
      * Increment the next transaction order id

src/wallet/walletdb.cpp

@@ -120,15 +120,19 @@ bool CWalletDB::WriteCScript(const uint160& hash, const CScript& redeemScript)
     return Write(std::make_pair(std::string("cscript"), hash), *(const CScriptBase*)(&redeemScript), false);
 }
 
-bool CWalletDB::WriteWatchOnly(const CScript &dest)
+bool CWalletDB::WriteWatchOnly(const CScript &dest, const CKeyMetadata& keyMeta)
 {
     nWalletDBUpdateCounter++;
+    if (!Write(std::make_pair(std::string("watchmeta"), *(const CScriptBase*)(&dest)), keyMeta))
+        return false;
     return Write(std::make_pair(std::string("watchs"), *(const CScriptBase*)(&dest)), '1');
 }
 
 bool CWalletDB::EraseWatchOnly(const CScript &dest)
 {
     nWalletDBUpdateCounter++;
+    if (!Erase(std::make_pair(std::string("watchmeta"), *(const CScriptBase*)(&dest))))
+        return false;
     return Erase(std::make_pair(std::string("watchs"), *(const CScriptBase*)(&dest)));
 }
 
@@ -259,6 +263,7 @@ class CWalletScanState {
 public:
     unsigned int nKeys;
     unsigned int nCKeys;
+    unsigned int nWatchKeys;
     unsigned int nKeyMeta;
     bool fIsEncrypted;
     bool fAnyUnordered;
@@ -266,7 +271,7 @@ public:
     vector<uint256> vWalletUpgrade;
 
     CWalletScanState() {
-        nKeys = nCKeys = nKeyMeta = 0;
+        nKeys = nCKeys = nWatchKeys = nKeyMeta = 0;
         fIsEncrypted = false;
         fAnyUnordered = false;
         nFileVersion = 0;
@@ -348,16 +353,13 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
         }
         else if (strType == "watchs")
         {
+            wss.nWatchKeys++;
             CScript script;
             ssKey >> *(CScriptBase*)(&script);
             char fYes;
             ssValue >> fYes;
             if (fYes == '1')
                 pwallet->LoadWatchOnly(script);
-
-            // Watch-only addresses have no birthday information for now,
-            // so set the wallet birthday to the beginning of time.
-            pwallet->nTimeFirstKey = 1;
         }
         else if (strType == "key" || strType == "wkey")
         {
@@ -458,20 +460,27 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
             }
             wss.fIsEncrypted = true;
         }
-        else if (strType == "keymeta")
+        else if (strType == "keymeta" || strType == "watchmeta")
+        {
+            CTxDestination keyID;
+            if (strType == "keymeta")
             {
               CPubKey vchPubKey;
               ssKey >> vchPubKey;
+              keyID = vchPubKey.GetID();
+            }
+            else if (strType == "watchmeta")
+            {
+              CScript script;
+              ssKey >> *(CScriptBase*)(&script);
+              keyID = CScriptID(script);
+            }
+
             CKeyMetadata keyMeta;
             ssValue >> keyMeta;
             wss.nKeyMeta++;
 
-            pwallet->LoadKeyMetadata(vchPubKey, keyMeta);
-
-            // find earliest key creation time, as wallet birthday
-            if (!pwallet->nTimeFirstKey ||
-                (keyMeta.nCreateTime < pwallet->nTimeFirstKey))
-                pwallet->nTimeFirstKey = keyMeta.nCreateTime;
+            pwallet->LoadKeyMetadata(keyID, keyMeta);
         }
         else if (strType == "defaultkey")
         {
@@ -625,8 +634,8 @@ DBErrors CWalletDB::LoadWallet(CWallet* pwallet)
            wss.nKeys, wss.nCKeys, wss.nKeyMeta, wss.nKeys + wss.nCKeys);
 
     // nTimeFirstKey is only reliable if all keys have metadata
-    if ((wss.nKeys + wss.nCKeys) != wss.nKeyMeta)
-        pwallet->nTimeFirstKey = 1; // 0 would be considered 'no value'
+    if ((wss.nKeys + wss.nCKeys + wss.nWatchKeys) != wss.nKeyMeta)
+        pwallet->UpdateTimeFirstKey(1);
 
     BOOST_FOREACH(uint256 hash, wss.vWalletUpgrade)
         WriteTx(pwallet->mapWallet[hash]);

src/wallet/walletdb.h

@@ -135,7 +135,7 @@ public:
 
     bool WriteCScript(const uint160& hash, const CScript& redeemScript);
 
-    bool WriteWatchOnly(const CScript &script);
+    bool WriteWatchOnly(const CScript &script, const CKeyMetadata &keymeta);
     bool EraseWatchOnly(const CScript &script);
 
     bool WriteBestBlock(const CBlockLocator& locator);