Wire state block creation and verificaiton into consensus

blockchain/utxopool.go

@@ -85,6 +85,12 @@ func (utxoPool *UTXOPool) VerifyTransactions(transactions []*Transaction) bool {
 	return true
 }
 
+// VerifyStateBlock verifies if the given state block matches the current utxo pool.
+func (utxoPool *UTXOPool) VerifyStateBlock(stateBlock *Block) bool {
+	// TODO: implement this
+	return true
+}
+
 // VerifyOneTransaction verifies if a list of transactions valid.
 func (utxoPool *UTXOPool) VerifyOneTransaction(tx *Transaction, spentTXOs *map[[20]byte]map[string]map[uint32]bool) (valid, crossShard bool) {
 	if len(tx.Proofs) != 0 {

node/node_handler.go

@@ -271,7 +271,11 @@ func (node *Node) BroadcastNewBlock(newBlock *blockchain.Block) {
 
 // This is called by consensus participants to verify the block they are running consensus on
 func (node *Node) VerifyNewBlock(newBlock *blockchain.Block) bool {
+	if bytes.Equal(newBlock.PrevBlockHash[:], (&[32]byte{})[:]) {
+		return node.UtxoPool.VerifyStateBlock(newBlock)
+	} else {
 		return node.UtxoPool.VerifyTransactions(newBlock.Transactions)
+	}
 }
 
 // This is called by consensus participants, after consensus is done, to: