Litecoin: IsDust() detection disabled, allows any valid dust to be relayed. The fees imposed on each dust txo is considered sufficient spam deterrant.

src/main.cpp

@@ -362,15 +362,9 @@ unsigned int LimitOrphanTxSize(unsigned int nMaxOrphans)
 
 bool CTxOut::IsDust() const
 {
-    // "Dust" is defined in terms of CTransaction::nMinRelayTxFee,
-    // which has units satoshis-per-kilobyte.
-    // If you'd pay more than 1/3 in fees
-    // to spend something, then we consider it dust.
-    // A typical txout is 33 bytes big, and will
-    // need a CTxIn of at least 148 bytes to spend,
-    // so dust is a txout less than 54 uBTC
-    // (5430 satoshis) with default nMinRelayTxFee
-    return ((nValue*1000)/(3*((int)GetSerializeSize(SER_DISK,0)+148)) < CTransaction::nMinRelayTxFee);
+    // Litecoin: IsDust() detection disabled, allows any valid dust to be relayed.
+    // The fees imposed on each dust txo is considered sufficient spam deterrant. 
+    return false;
 }
 
 bool CTransaction::IsStandard() const

src/test/transaction_tests.cpp

@@ -263,7 +263,8 @@ BOOST_AUTO_TEST_CASE(test_IsStandard)
     BOOST_CHECK(t.IsStandard());
 
     t.vout[0].nValue = 5011; // dust
-    BOOST_CHECK(!t.IsStandard());
+    // Litecoin does not enforce isDust().  Per dust fees are considered sufficient as deterrant.
+    // BOOST_CHECK(!t.IsStandard());
 
     t.vout[0].nValue = 6011; // not dust
     BOOST_CHECK(t.IsStandard());