add timestamp to block

commands/schema/filecoin_block.schema.json

@@ -64,6 +64,9 @@
             "string",
             "null"
           ]
+        },
+        "timestamp": {
+          "type": "string"
         }
       },
       "required": [
@@ -74,7 +77,8 @@
         "parents",
         "proof",
         "stateRoot",
-        "ticket"
+        "ticket",
+        "timestamp"
       ],
       "type": "object"
     },

types/block.go

@@ -52,6 +52,9 @@ type Block struct {
 	// a challenge
 	Proof PoStProof `json:"proof"`
 
+	// The timestamp, in seconds since the Unix epoch, at which this block was created.
+	Timestamp Uint64 `json:"timestamp"`
+
 	cachedCid cid.Cid
 
 	cachedBytes []byte

types/block_test.go

@@ -72,11 +72,12 @@ func TestTriangleEncoding(t *testing.T) {
 			ParentWeight:    Uint64(1000),
 			Proof:           NewTestPoSt(),
 			StateRoot:       SomeCid(),
+			Timestamp:       Uint64(1),
 		}
 		s := reflect.TypeOf(*b)
 		// This check is here to request that you add a non-zero value for new fields
 		// to the above (and update the field count below).
-		require.Equal(t, 12, s.NumField()) // Note: this also counts private fields
+		require.Equal(t, 13, s.NumField()) // Note: this also counts private fields
 		testRoundTrip(t, b)
 	})
 }