Merge bitcoin/bitcoin#23644: wallet: Replace confusing getAdjustedTime() with GetTime()

fa37e798b2 wallet: Replace confusing getAdjustedTime() with GetTime() (MarcoFalke)

Pull request description:

  Setting `nTimeReceived` to the adjusted time has several issues:

  * `m_best_block_time` is set to the "unadjusted" time, thus a comparison of the two times is like comparing apples to oranges. In the worst case this opens up an attack vector where remote peers can force a premature re-broadcast of wallet txs.
  * The RPC documentation for `"timereceived"` doesn't mention that the network adjusted time is used, possibly confusing users when the time reported by RPC is off by a few seconds compared to their local timestamp.

  Fix all issues by replacing the call with `GetTime()`. Also a style fix: Use non-narrowing integer conversion in the RPC method.

ACKs for top commit:
  theStack:
    Code-review ACK fa37e798b2
  shaavan:
    crACK fa37e798b2

Tree-SHA512: 8d020ba400521246b7aed4b6c41319fc70552e8c69e929a5994500375466a9edac02a0ae64b803dbc6695df22276489561a23bd6e030c44c97d288f7b9b2b3fa

src/interfaces/chain.h

@@ -217,9 +217,6 @@ public:
     //! Check if shutdown requested.
     virtual bool shutdownRequested() = 0;
 
-    //! Get adjusted time.
-    virtual int64_t getAdjustedTime() = 0;
-
     //! Send init message.
     virtual void initMessage(const std::string& message) = 0;
 

src/node/interfaces.cpp

@@ -656,7 +656,6 @@ public:
         return chainman().ActiveChainstate().IsInitialBlockDownload();
     }
     bool shutdownRequested() override { return ShutdownRequested(); }
-    int64_t getAdjustedTime() override { return GetAdjustedTime(); }
     void initMessage(const std::string& message) override { ::uiInterface.InitMessage(message); }
     void initWarning(const bilingual_str& message) override { InitWarning(message); }
     void initError(const bilingual_str& message) override { InitError(message); }

src/wallet/rpcwallet.cpp

@@ -81,7 +81,7 @@ static void WalletTxToJSON(const CWallet& wallet, const CWalletTx& wtx, UniValue
         conflicts.push_back(conflict.GetHex());
     entry.pushKV("walletconflicts", conflicts);
     entry.pushKV("time", wtx.GetTxTime());
-    entry.pushKV("timereceived", (int64_t)wtx.nTimeReceived);
+    entry.pushKV("timereceived", int64_t{wtx.nTimeReceived});
 
     // Add opt-in RBF status
     std::string rbfStatus = "no";

src/wallet/wallet.cpp

@@ -915,7 +915,7 @@ CWalletTx* CWallet::AddToWallet(CTransactionRef tx, const TxState& state, const
     bool fInsertedNew = ret.second;
     bool fUpdated = update_wtx && update_wtx(wtx, fInsertedNew);
     if (fInsertedNew) {
-        wtx.nTimeReceived = chain().getAdjustedTime();
+        wtx.nTimeReceived = GetTime();
         wtx.nOrderPos = IncOrderPosNext(&batch);
         wtx.m_it_wtxOrdered = wtxOrdered.insert(std::make_pair(wtx.nOrderPos, &wtx));
         wtx.nTimeSmart = ComputeTimeSmart(wtx, rescanning_old_block);
@@ -1303,7 +1303,6 @@ void CWallet::updatedBlockTip()
     m_best_block_time = GetTime();
 }
 
-
 void CWallet::BlockUntilSyncedToCurrentChain() const {
     AssertLockNotHeld(cs_wallet);
     // Skip the queue-draining stuff if we know we're caught up with