diff --git a/src/avalanche/proof.cpp b/src/avalanche/proof.cpp
--- a/src/avalanche/proof.cpp
+++ b/src/avalanche/proof.cpp
@@ -91,6 +91,14 @@
             return state.Invalid(ProofValidationResult::MISSING_UTXO);
         }
 
+        if (s.isCoinbase() != coin.IsCoinBase()) {
+            return state.Invalid(ProofValidationResult::COINBASE_MISMATCH);
+        }
+
+        if (s.getHeight() != coin.GetHeight()) {
+            return state.Invalid(ProofValidationResult::HEIGHT_MISMATCH);
+        }
+
         const CTxOut &out = coin.GetTxOut();
         if (s.getAmount() != out.nValue) {
             // Wrong amount.
diff --git a/src/avalanche/test/proof_tests.cpp b/src/avalanche/test/proof_tests.cpp
--- a/src/avalanche/test/proof_tests.cpp
+++ b/src/avalanche/test/proof_tests.cpp
@@ -376,6 +376,14 @@
     runCheck(ProofValidationResult::NONE, pkh_outpoint, value, height, false,
              key);
 
+    // Coinbase mismatch
+    runCheck(ProofValidationResult::COINBASE_MISMATCH, pkh_outpoint, value,
+             height, true, key);
+
+    // Height mismatch
+    runCheck(ProofValidationResult::HEIGHT_MISMATCH, pkh_outpoint, value,
+             height + 1, false, key);
+
     // Amount mismatch
     runCheck(ProofValidationResult::AMOUNT_MISMATCH, pkh_outpoint,
              value + 1 * SATOSHI, height, false, key);
diff --git a/src/avalanche/validation.h b/src/avalanche/validation.h
--- a/src/avalanche/validation.h
+++ b/src/avalanche/validation.h
@@ -18,6 +18,8 @@
 
     // UTXO based errors.
     MISSING_UTXO,
+    COINBASE_MISMATCH,
+    HEIGHT_MISMATCH,
     AMOUNT_MISMATCH,
     NON_STANDARD_DESTINATION,
     DESTINATION_NOT_SUPPORTED,