func chkblock(bl *btc.Block) (er error) { // Check timestamp (must not be higher than now +2 hours) if int64(bl.BlockTime()) > time.Now().Unix()+2*60*60 { er = errors.New("CheckBlock() : block timestamp too far in the future") return } if prv, pres := MemBlockChain.BlockIndex[bl.Hash.BIdx()]; pres { if prv.Parent == nil { // This is genesis block er = errors.New("Genesis") return } else { return } } prevblk, ok := MemBlockChain.BlockIndex[btc.NewUint256(bl.ParentHash()).BIdx()] if !ok { er = errors.New("CheckBlock: " + bl.Hash.String() + " parent not found") return } // Check proof of work gnwr := MemBlockChain.GetNextWorkRequired(prevblk, bl.BlockTime()) if bl.Bits() != gnwr { if !Testnet || ((prevblk.Height+1)%2016) != 0 { er = errors.New(fmt.Sprint("CheckBlock: Incorrect proof of work at block", prevblk.Height+1)) } } cur := new(btc.BlockTreeNode) cur.BlockHash = bl.Hash cur.Parent = prevblk cur.Height = prevblk.Height + 1 cur.TxCount = uint32(bl.TxCount) copy(cur.BlockHeader[:], bl.Raw[:80]) prevblk.Childs = append(prevblk.Childs, cur) MemBlockChain.BlockIndex[cur.BlockHash.BIdx()] = cur LastBlock.Mutex.Lock() if cur.Height > LastBlock.node.Height { LastBlock.node = cur } LastBlock.Mutex.Unlock() return }