From ed25ecdccad2d0110347c980959f3a21d5fe10bf Mon Sep 17 00:00:00 2001
From: 12henry <12henry@ub.com>
Date: Tue, 24 Jul 2018 16:43:47 +0800
Subject: [PATCH] bug fixed

---
 src/validation.cpp | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/validation.cpp b/src/validation.cpp
index ac2eb781dcfee..11839a46d2e83 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -3187,6 +3187,19 @@ bool CChainState::ConnectBlock(const CBlock& block, CValidationState& state, CBl
                                  REJECT_INVALID, "bad-txns-nonfinal");
             }
         }
+        if(block.IsProofOfStake() && tx.IsCoinStake())
+        {
+            const COutPoint &prevout = tx.vin[0].prevout;
+            const Coin& coin = view.AccessCoin(prevout);
+            assert(!coin.IsSpent());
+
+            // If prev is coinbase, check that it's matured
+
+            if (coin.nHeight > ((chainActive.Height() + 1) - Params().GetConsensus().nStakeMinConfirmations))
+                return state.Invalid(false,
+                    REJECT_INVALID, "utxo not reach stake min confirmations",
+                    strprintf("coin.nHeight: %d", coin.nHeight));
+        }
 
         // GetTransactionSigOpCost counts 3 types of sigops:
         // * legacy (always)