diff --git a/Makefile b/Makefile
index 521df2a..47d3478 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 .PHONY: default build
 default: build
-build: node.go client.go serve.go
+build: node.go client.go serve.go values.go
 	go build -o node node.go serve.go values.go
 	go build -o client client.go values.go
diff --git a/blockchain/chain.go b/blockchain/chain.go
index 991c640..6b0fd96 100644
--- a/blockchain/chain.go
+++ b/blockchain/chain.go
@@ -242,7 +242,7 @@ func (chain *BlockChain) timeIsValid(block *Block, index uint64) bool {
 	}
 
 	result := btime.Sub(ltime)
-	return result >= TIME_SESSION
+	return result > 0
 }
 
 func (chain *BlockChain) hashIsValid(block *Block, index uint64) bool {
diff --git a/blockchain/settings.go b/blockchain/settings.go
index 287fbbb..6642b8b 100644
--- a/blockchain/settings.go
+++ b/blockchain/settings.go
@@ -31,7 +31,6 @@ const (
 	GENESIS_REWARD = 100
 	DIFFICULTY     = 20              // 15
 	TXS_LIMIT      = 2               // 6
-	TIME_SESSION   = 1 * time.Minute // minutes
 	START_PERCENT  = 10
 	RAND_BYTES     = 32
 )
diff --git a/serve.go b/serve.go
index 44f53b1..9695f06 100644
--- a/serve.go
+++ b/serve.go
@@ -12,7 +12,6 @@ import (
 	"os"
 	"strconv"
 	"strings"
-	"time"
 )
 
 var (
@@ -195,21 +194,8 @@ func addTransaction(pack *nt.Package) string {
 		return "fail"
 	}
 	if len(Block.Transactions) == bc.TXS_LIMIT {
-		lastBlock := getLastBlock()
-		if lastBlock == nil {
-			return "fail"
-		}
-		btime, err := time.Parse(time.RFC3339, lastBlock.TimeStamp)
-		if err != nil {
-			return "fail"
-		}
-		mod := time.Now().Sub(btime)
-		diff := mod < bc.TIME_SESSION
 		go func() {
 			block := *Block
-			if diff {
-				time.Sleep(bc.TIME_SESSION - mod)
-			}
 			IsMining = true
 			res := Chain.AcceptBlock(User, &block, BreakMining)
 			IsMining = false
@@ -223,13 +209,6 @@ func addTransaction(pack *nt.Package) string {
 	return "ok"
 }
 
-func getLastBlock() *bc.Block {
-	var sblock string
-	row := Chain.DB.QueryRow("SELECT Block FROM BlockChain ORDER BY Id DESC")
-	row.Scan(&sblock)
-	return bc.DeserializeBlock(sblock)
-}
-
 func pushBlockToNet(block *bc.Block) {
 	var sblock = bc.SerializeBlock(block)
 	for _, addr := range Addresses {