Handle alternative self destruct state diff format.

api/transactionstatechange.go

@@ -89,14 +89,18 @@ func (t *TransactionStateChange) unpack(data *transactionStateChangeJSON) error
 	}
 
 	if data.Alteration != nil {
-		t.From, err = util.StrToBigInt("from", data.Alteration.From)
-		if err != nil {
-			return err
+		if data.Alteration.From != "" {
+			t.From, err = util.StrToBigInt("from", data.Alteration.From)
+			if err != nil {
+				return err
+			}
 		}
 
-		t.To, err = util.StrToBigInt("to", data.Alteration.To)
-		if err != nil {
-			return err
+		if data.Alteration.To != "" {
+			t.To, err = util.StrToBigInt("to", data.Alteration.To)
+			if err != nil {
+				return err
+			}
 		}
 	}
 

api/transactionstatediff_test.go

@@ -62,6 +62,26 @@ func TestTransactionStateDiff(t *testing.T) {
 			input:    []byte(`{"balance":{"*":{"from":"0x1d53ae02be969d05","to":"0x1d0ddce00eb7500a"}},"code":"=","nonce":{"*":{"from":"0x397","to":"0x398"}},"storage":{}}`),
 			expected: []byte(`{"balance":{"*":{"from":"0x1d53ae02be969d05","to":"0x1d0ddce00eb7500a"}},"nonce":{"*":{"from":"0x397","to":"0x398"}}}`),
 		},
+		{
+			name:     "GoodNewBalance",
+			input:    []byte(`{"balance":{"+":"0x1d53ae02be969d05"},"code":"=","nonce":{"+":"0x0"}}`),
+			expected: []byte(`{"balance":{"+":"0x1d53ae02be969d05"},"nonce":{"+":"0x0"}}`),
+		},
+		{
+			name:     "GoodNoChanges",
+			input:    []byte(`{"balance":"=","code":"=","nonce":"="}`),
+			expected: []byte(`{}`),
+		},
+		{
+			name:     "GoodSelfDestruct",
+			input:    []byte(`{"balance":{"*":{"from":"0x1","to":null}},"code":{"*":{"from":"0x608060405260","to":null}},"nonce":{"*":{"from":"0x1","to":null}}}`),
+			expected: []byte(`{"balance":{"-":"0x1"},"nonce":{"-":"0x1"}}`),
+		},
+		{
+			name:     "GoodSelfDestructCanonical",
+			input:    []byte(`{"balance":{"-":"0x1"},"code":{"-":"0x608060405260"},"nonce":{"-":"0x1"}}`),
+			expected: []byte(`{"balance":{"-":"0x1"},"nonce":{"-":"0x1"}}`),
+		},
 	}
 
 	for _, test := range tests {