diff --git a/block/miniblock.go b/block/miniblock.go
index ab91583..d21ad15 100644
--- a/block/miniblock.go
+++ b/block/miniblock.go
@@ -18,6 +18,8 @@ package block
 
 import "fmt"
 import "time"
+import "hash"
+import "sync"
 import "strings"
 import "encoding/binary"
 
@@ -28,6 +30,10 @@ import "github.com/deroproject/derohe/pow"
 
 const MINIBLOCK_SIZE = 68
 
+var hasherPool = sync.Pool{
+	New: func() interface{} { return sha3.New256() },
+}
+
 // it should be exactly 68 bytes after serialization
 // structure size 1 + 6 + 4 + 4 + 16 +32 + 5 bytes
 type MiniBlock struct {
@@ -91,9 +97,17 @@ func (mbl *MiniBlock) GetMiniID() uint32 {
 }
 
 // this function gets the block identifier hash, this is only used to deduplicate mini blocks
-func (mbl *MiniBlock) GetHash() (hash crypto.Hash) {
+func (mbl *MiniBlock) GetHash() (result crypto.Hash) {
 	ser := mbl.Serialize()
-	return sha3.Sum256(ser[:])
+	sha := hasherPool.Get().(hash.Hash)
+	sha.Reset()
+	sha.Write(ser[:])
+	x := sha.Sum(nil)
+	copy(result[:], x[:])
+	hasherPool.Put(sha)
+	return result
+
+	//	return sha3.Sum256(ser[:])
 }
 
 // Get PoW hash , this is very slow function
diff --git a/block/miniblockdag.go b/block/miniblockdag.go
index b67d1e8..4d66cf7 100644
--- a/block/miniblockdag.go
+++ b/block/miniblockdag.go
@@ -192,7 +192,7 @@ func (c *MiniBlocksCollection) GetAllTips() (mbls []MiniBlock) {
 
 	clone := map[uint32]MiniBlock{}
 
-	var clone_list []MiniBlock
+	clone_list := make([]MiniBlock, 0, 64)
 	for k, v := range c.Collection {
 		clone[k] = v
 		clone_list = append(clone_list, v)
@@ -273,6 +273,8 @@ func (c *MiniBlocksCollection) GetGenesisFromMiniBlock(mbl MiniBlock) (genesis [
 
 // this works in all cases, but it may return truncated history,all returns must be checked for connectivity
 func (c *MiniBlocksCollection) GetEntireMiniBlockHistory(mbl MiniBlock) (history []MiniBlock) {
+
+	history = make([]MiniBlock, 0, 128)
 	if mbl.Genesis {
 		history = append(history, mbl)
 		return
@@ -301,6 +303,7 @@ func (c *MiniBlocksCollection) GetEntireMiniBlockHistory(mbl MiniBlock) (history
 // gets the genesis from the tips
 // this function only works, if the miniblock has been expanded
 func GetGenesisFromMiniBlock(mbl MiniBlock) (genesis []MiniBlock) {
+
 	if mbl.Genesis {
 		genesis = append(genesis, mbl)
 		return
@@ -325,20 +328,36 @@ func GetGenesisFromMiniBlock(mbl MiniBlock) (genesis []MiniBlock) {
 
 // get entire history,its in sorted form
 func GetEntireMiniBlockHistory(mbls ...MiniBlock) (history []MiniBlock) {
-	var queue []MiniBlock
+	queue := make([]MiniBlock, 0, 128)
 	queue = append(queue, mbls...)
+	history = make([]MiniBlock, 0, 128)
+	unique := make([]MiniBlock, 0, 128)
+
+	unique_map := map[crypto.Hash]MiniBlock{}
 
 	for len(queue) > 0 {
 		item := queue[0]
 		queue = queue[1:] // Dequeue
 
-		history = append(history, item) //mini blocks might be duplicated
-		if !item.Genesis {
-			queue = append(queue, item.PastMiniBlocks...)
+		if _, ok := unique_map[item.GetHash()]; !ok {
+			unique_map[item.GetHash()] = item
+			history = append(history, item) //mini blocks might be duplicated
+			if !item.Genesis {
+				queue = append(queue, item.PastMiniBlocks...)
+			}
 		}
 	}
 
+	for _, v := range unique_map {
+		unique = append(unique, v)
+	}
+
 	history = MiniBlocks_Unique(history)
+
+	if len(unique) != len(history) {
+		panic("result mismatch")
+	}
+
 	history = MiniBlocks_SortByTimeAsc(history) // sort on the basis of timestamps
 
 	return
@@ -347,6 +366,7 @@ func GetEntireMiniBlockHistory(mbls ...MiniBlock) (history []MiniBlock) {
 // this sorts by distance, in descending order
 // if distance is equal, then it sorts by its id which is collision free
 func MiniBlocks_SortByDistanceDesc(mbls []MiniBlock) (sorted []MiniBlock) {
+	sorted = make([]MiniBlock, 0, len(mbls))
 	sorted = append(sorted, mbls...)
 	sort.SliceStable(sorted, func(i, j int) bool { // sort descending on the basis of Distance
 		if sorted[i].Distance == sorted[j].Distance {
@@ -360,6 +380,7 @@ func MiniBlocks_SortByDistanceDesc(mbls []MiniBlock) (sorted []MiniBlock) {
 // this sorts by timestamp,ascending order
 // if timestamp is equal, then it sorts by its id which is collision free
 func MiniBlocks_SortByTimeAsc(mbls []MiniBlock) (sorted []MiniBlock) {
+	sorted = make([]MiniBlock, 0, len(mbls))
 	sorted = append(sorted, mbls...)
 	sort.SliceStable(sorted, func(i, j int) bool { // sort on the basis of timestamps
 		if sorted[i].Timestamp == sorted[j].Timestamp {
@@ -371,6 +392,7 @@ func MiniBlocks_SortByTimeAsc(mbls []MiniBlock) (sorted []MiniBlock) {
 }
 
 func MiniBlocks_Unique(mbls []MiniBlock) (unique []MiniBlock) {
+	unique = make([]MiniBlock, 0, len(mbls))
 	unique_map := map[crypto.Hash]MiniBlock{}
 	for _, mbl := range mbls {
 		unique_map[mbl.GetHash()] = mbl
diff --git a/blockchain/blockchain.go b/blockchain/blockchain.go
index 925ee83..27f74a5 100644
--- a/blockchain/blockchain.go
+++ b/blockchain/blockchain.go
@@ -71,6 +71,7 @@ type Blockchain struct {
 	cache_Get_Difficulty_At_Tips *lru.Cache // used to cache some outputs
 	cache_BlockPast              *lru.Cache // used to cache a blocks past
 	cache_BlockHeight            *lru.Cache // used to cache a blocks past
+	cache_VersionMerkle          *lru.Cache // used to cache a versions merkle root
 
 	integrator_address rpc.Address // integrator rewards will be given to this address
 
@@ -153,11 +154,15 @@ func Blockchain_Start(params map[string]interface{}) (*Blockchain, error) {
 		return nil, err
 	}
 
-	if chain.cache_BlockPast, err = lru.New(100 * 1024); err != nil { // temporary cache for a blocks past
+	if chain.cache_BlockPast, err = lru.New(1024); err != nil { // temporary cache for a blocks past
 		return nil, err
 	}
 
-	if chain.cache_BlockHeight, err = lru.New(100 * 1024); err != nil { // temporary cache for a blocks height
+	if chain.cache_BlockHeight, err = lru.New(10 * 1024); err != nil { // temporary cache for a blocks height
+		return nil, err
+	}
+
+	if chain.cache_VersionMerkle, err = lru.New(1024); err != nil { // temporary cache for a snapshot version
 		return nil, err
 	}
 
@@ -231,11 +236,11 @@ func Blockchain_Start(params map[string]interface{}) (*Blockchain, error) {
 
 		top_block_topo_index := chain.Load_TOPO_HEIGHT()
 
-		if top_block_topo_index < 10 {
+		if top_block_topo_index < 4 {
 			return
 		}
 
-		top_block_topo_index -= 10
+		top_block_topo_index -= 4
 
 		blid, err := chain.Load_Block_Topological_order_at_index(top_block_topo_index)
 		if err != nil {
@@ -689,7 +694,7 @@ func (chain *Blockchain) Add_Complete_Block(cbl *block.Complete_Block) (err erro
 					if tx.SCDATA.Has(rpc.SCACTION, rpc.DataUint64) {
 						if rpc.SC_INSTALL == rpc.SC_ACTION(tx.SCDATA.Value(rpc.SCACTION, rpc.DataUint64).(uint64)) {
 							txid := tx.GetHash()
-							if txid[31] < 0x80 { // last byte should be more than 0x80
+							if txid[0] < 0x80 || txid[31] < 0x80 { // last byte should be more than 0x80
 								block_logger.Error(fmt.Errorf("Invalid SCID"), "SCID installing tx must end with >0x80 byte", "txid", cbl.Txs[i].GetHash())
 								return errormsg.ErrTXDoubleSpend, false
 							}
@@ -1188,6 +1193,17 @@ func (chain *Blockchain) Add_TX_To_Pool(tx *transaction.Transaction) error {
 		return err
 	}
 
+	if tx.TransactionType == transaction.SC_TX {
+		if tx.SCDATA.Has(rpc.SCACTION, rpc.DataUint64) {
+			if rpc.SC_INSTALL == rpc.SC_ACTION(tx.SCDATA.Value(rpc.SCACTION, rpc.DataUint64).(uint64)) {
+				txid := tx.GetHash()
+				if txid[0] < 0x80 || txid[31] < 0x80 { // last byte should be more than 0x80
+					return fmt.Errorf("Invalid SCID ID,it must not start with 0x80")
+				}
+			}
+		}
+	}
+
 	if err := chain.Verify_Transaction_NonCoinbase_CheckNonce_Tips(hf_version, tx, chain.Get_TIPS()); err != nil { // transaction verification failed
 		logger.V(1).Error(err, "Incoming TX nonce verification failed", "txid", txhash, "stacktrace", globals.StackTrace(false))
 		return fmt.Errorf("Incoming TX %s nonce verification failed, err %s", txhash, err)
diff --git a/blockchain/store.go b/blockchain/store.go
index 8f59485..0924d48 100644
--- a/blockchain/store.go
+++ b/blockchain/store.go
@@ -18,7 +18,6 @@ package blockchain
 
 import "fmt"
 import "math/big"
-import "crypto/rand"
 import "path/filepath"
 
 import "github.com/deroproject/derohe/globals"
@@ -55,9 +54,7 @@ func (s *storage) Initialize(params map[string]interface{}) (err error) {
 }
 
 func (s *storage) IsBalancesIntialized() bool {
-
 	var err error
-	var buf [64]byte
 	var balancehash, random_hash [32]byte
 
 	balance_ss, _ := s.Balance_store.LoadSnapshot(0) // load most recent snapshot
@@ -65,12 +62,10 @@ func (s *storage) IsBalancesIntialized() bool {
 
 	// avoid hardcoding any hash
 	if balancehash, err = balancetree.Hash(); err == nil {
-		if _, err = rand.Read(buf[:]); err == nil {
-			random_tree, _ := balance_ss.GetTree(string(buf[:]))
-			if random_hash, err = random_tree.Hash(); err == nil {
-				if random_hash == balancehash {
-					return false
-				}
+		random_tree, _ := balance_ss.GetTree(config.SC_META)
+		if random_hash, err = random_tree.Hash(); err == nil {
+			if random_hash == balancehash {
+				return false
 			}
 		}
 	}
@@ -300,6 +295,11 @@ func (chain *Blockchain) Load_Block_Topological_order_at_index(index_pos int64)
 //load store hash from 2 tree
 func (chain *Blockchain) Load_Merkle_Hash(version uint64) (hash crypto.Hash, err error) {
 
+	if hashi, ok := chain.cache_VersionMerkle.Get(version); ok {
+		hash = hashi.(crypto.Hash)
+		return
+	}
+
 	ss, err := chain.Store.Balance_store.LoadSnapshot(version)
 	if err != nil {
 		return
@@ -324,5 +324,9 @@ func (chain *Blockchain) Load_Merkle_Hash(version uint64) (hash crypto.Hash, err
 	for i := range balance_merkle_hash {
 		hash[i] = balance_merkle_hash[i] ^ meta_merkle_hash[i]
 	}
+
+	if chain.cache_enabled { //set in cache
+		chain.cache_VersionMerkle.Add(version, hash)
+	}
 	return hash, nil
 }
diff --git a/blockchain/transaction_verify.go b/blockchain/transaction_verify.go
index 9aab297..65097c9 100644
--- a/blockchain/transaction_verify.go
+++ b/blockchain/transaction_verify.go
@@ -49,7 +49,7 @@ func clean_up_valid_cache() {
 	current_time := time.Now()
 	transaction_valid_cache.Range(func(k, value interface{}) bool {
 		first_seen := value.(time.Time)
-		if current_time.Sub(first_seen).Round(time.Second).Seconds() > 3600 {
+		if current_time.Sub(first_seen).Round(time.Second).Seconds() > 360 {
 			transaction_valid_cache.Delete(k)
 		}
 		return true
diff --git a/cmd/derod/main.go b/cmd/derod/main.go
index 9a50f5a..bbd7a5f 100644
--- a/cmd/derod/main.go
+++ b/cmd/derod/main.go
@@ -26,6 +26,7 @@ import "bufio"
 import "strings"
 import "strconv"
 import "runtime"
+import "runtime/debug"
 import "math/big"
 import "os/signal"
 import "io/ioutil"
@@ -89,9 +90,24 @@ var Exit_In_Progress = make(chan bool)
 
 var logger logr.Logger
 
+func dump(filename string) {
+	f, err := os.Create(filename)
+	if err != nil {
+		fmt.Printf("err creating file %s\n", err)
+		return
+	}
+
+	runtime.GC()
+	debug.WriteHeapDump(f.Fd())
+
+	err = f.Close()
+	if err != nil {
+		fmt.Printf("err closing file %s\n", err)
+	}
+}
+
 func main() {
 	var err error
-
 	globals.Arguments, err = docopt.Parse(command_line, nil, true, config.Version.String(), false)
 
 	if err != nil {
@@ -781,6 +797,12 @@ restart_loop:
 
 		case command == "gc":
 			runtime.GC()
+		case command == "heap":
+			if len(line_parts) == 1 {
+				fmt.Printf("heap needs a filename to write\n")
+				break
+			}
+			dump(line_parts[1])
 
 		case command == "ban":
 
diff --git a/config/config.go b/config/config.go
index 88c3f20..51b76fb 100644
--- a/config/config.go
+++ b/config/config.go
@@ -103,7 +103,7 @@ var Mainnet = CHAIN_CONFIG{Name: "mainnet",
 }
 
 var Testnet = CHAIN_CONFIG{Name: "testnet", // testnet will always have last 3 bytes 0
-	Network_ID:              uuid.FromBytesOrNil([]byte{0x59, 0xd7, 0xf7, 0xe9, 0xdd, 0x48, 0xd5, 0xfd, 0x13, 0x0a, 0xf6, 0xe0, 0x70, 0x00, 0x00, 0x00}),
+	Network_ID:              uuid.FromBytesOrNil([]byte{0x59, 0xd7, 0xf7, 0xe9, 0xdd, 0x48, 0xd5, 0xfd, 0x13, 0x0a, 0xf6, 0xe0, 0x71, 0x00, 0x00, 0x00}),
 	P2P_Default_Port:        40401,
 	RPC_Default_Port:        40402,
 	Wallet_RPC_Default_Port: 40403,
diff --git a/config/seed_nodes.go b/config/seed_nodes.go
index 92837e9..66a1cb9 100644
--- a/config/seed_nodes.go
+++ b/config/seed_nodes.go
@@ -30,4 +30,5 @@ var Mainnet_seed_nodes = []string{
 // some seed node for testnet
 var Testnet_seed_nodes = []string{
 	"68.183.12.117:40401",
+	"167.99.145.53:40401",
 }
diff --git a/config/version.go b/config/version.go
index 6b08ad0..cdf9989 100644
--- a/config/version.go
+++ b/config/version.go
@@ -20,4 +20,4 @@ import "github.com/blang/semver/v4"
 
 // right now it has to be manually changed
 // do we need to include git commitsha??
-var Version = semver.MustParse("3.4.87-1.DEROHE.STARGATE+24112021")
+var Version = semver.MustParse("3.4.89-1.DEROHE.STARGATE+22112021")
diff --git a/vendor/github.com/creachadair/jrpc2/base.go b/vendor/github.com/creachadair/jrpc2/base.go
index 2b225f9..c595a9c 100644
--- a/vendor/github.com/creachadair/jrpc2/base.go
+++ b/vendor/github.com/creachadair/jrpc2/base.go
@@ -14,6 +14,8 @@ import (
 // no method is available to handle the request.
 type Assigner interface {
 	// Assign returns the handler for the named method, or nil.
+	// The implementation can obtain the complete request from ctx using the
+	// jrpc2.InboundRequest function.
 	Assign(ctx context.Context, method string) Handler
 
 	// Names returns a slice of all known method names for the assigner.  The
diff --git a/vendor/github.com/creachadair/jrpc2/channel/channel.go b/vendor/github.com/creachadair/jrpc2/channel/channel.go
index 1519a8c..6bae36f 100644
--- a/vendor/github.com/creachadair/jrpc2/channel/channel.go
+++ b/vendor/github.com/creachadair/jrpc2/channel/channel.go
@@ -1,6 +1,8 @@
-// Package channel defines a communications channel that can encode/transmit
-// and decode/receive data records with a configurable framing discipline, and
-// provides some simple framing implementations.
+// Package channel defines a basic communications channel.
+//
+// A Channel encodes/transmits and decodes/receives data records over an
+// unstructured stream, using a configurable framing discipline. This package
+// provides some basic framing implementations.
 //
 // Channels
 //
diff --git a/vendor/github.com/creachadair/jrpc2/channel/json.go b/vendor/github.com/creachadair/jrpc2/channel/json.go
index 6fe33e4..13639f0 100644
--- a/vendor/github.com/creachadair/jrpc2/channel/json.go
+++ b/vendor/github.com/creachadair/jrpc2/channel/json.go
@@ -10,6 +10,10 @@ const bufSize = 4096
 // RawJSON is a framing that transmits and receives records on r and wc, in which
 // each record is defined by being a complete JSON value. No padding or other
 // separation is added.
+//
+// A RawJSON channel has no out-of-band framing, so the channel cannot usually
+// recover after a message that is not syntactically valid JSON.  Applications
+// that need a channel to survive invalid JSON should avoid this framing.
 func RawJSON(r io.Reader, wc io.WriteCloser) Channel {
 	return jsonc{wc: wc, dec: json.NewDecoder(r), buf: make([]byte, bufSize)}
 }
diff --git a/vendor/github.com/creachadair/jrpc2/code/code.go b/vendor/github.com/creachadair/jrpc2/code/code.go
index ece0f4a..ac3e09f 100644
--- a/vendor/github.com/creachadair/jrpc2/code/code.go
+++ b/vendor/github.com/creachadair/jrpc2/code/code.go
@@ -57,18 +57,16 @@ func (c Code) Err() error {
 	return codeError(c)
 }
 
-// Pre-defined standard error codes defined by the JSON-RPC specification.
+// Error codes from and including -32768 to -32000 are reserved for pre-defined
+// errors by the JSON-RPC specification. These constants cover the standard
+// codes and implementation-specific codes used by the jrpc2 module.
 const (
-	ParseError     Code = -32700 // Invalid JSON received by the server
-	InvalidRequest Code = -32600 // The JSON sent is not a valid request object
-	MethodNotFound Code = -32601 // The method does not exist or is unavailable
-	InvalidParams  Code = -32602 // Invalid method parameters
-	InternalError  Code = -32603 // Internal JSON-RPC error
-)
+	ParseError     Code = -32700 // [std] Invalid JSON received by the server
+	InvalidRequest Code = -32600 // [std] The JSON sent is not a valid request object
+	MethodNotFound Code = -32601 // [std] The method does not exist or is unavailable
+	InvalidParams  Code = -32602 // [std] Invalid method parameters
+	InternalError  Code = -32603 // [std] Internal JSON-RPC error
 
-// The JSON-RPC 2.0 specification reserves the range -32000 to -32099 for
-// implementation-defined server errors. These are used by the jrpc2 package.
-const (
 	NoError          Code = -32099 // Denotes a nil error (used by FromError)
 	SystemError      Code = -32098 // Errors from the operating environment
 	Cancelled        Code = -32097 // Request cancelled (context.Canceled)
@@ -91,6 +89,10 @@ var stdError = map[Code]string{
 // Register adds a new Code value with the specified message string.  This
 // function will panic if the proposed value is already registered with a
 // different string.
+//
+// Registering a code allows you to control the string returned by the String
+// method for the code value you specify.  It is not necessary to register a
+// code before using it. An unregistered code renders a generic string.
 func Register(value int32, message string) Code {
 	code := Code(value)
 	if s, ok := stdError[code]; ok && s != message {
@@ -102,7 +104,7 @@ func Register(value int32, message string) Code {
 
 // FromError returns a Code to categorize the specified error.
 // If err == nil, it returns code.NoError.
-// If err is an ErrCoder, it returns the reported code value.
+// If err is (or wraps) an ErrCoder, it returns the reported code value.
 // If err is context.Canceled, it returns code.Cancelled.
 // If err is context.DeadlineExceeded, it returns code.DeadlineExceeded.
 // Otherwise it returns code.SystemError.
diff --git a/vendor/github.com/creachadair/jrpc2/doc.go b/vendor/github.com/creachadair/jrpc2/doc.go
index 80366b3..013f994 100644
--- a/vendor/github.com/creachadair/jrpc2/doc.go
+++ b/vendor/github.com/creachadair/jrpc2/doc.go
@@ -84,7 +84,7 @@ To create a client we need a channel:
 
    conn, err := net.Dial("tcp", "localhost:8080")
    ...
-   ch := channel.RawJSON(conn, conn)
+   ch := channel.Line(conn, conn)
    cli := jrpc2.NewClient(ch, nil)  // nil for default options
 
 To send a single RPC, use the Call method:
diff --git a/vendor/github.com/creachadair/jrpc2/error.go b/vendor/github.com/creachadair/jrpc2/error.go
index 39c9a54..161429d 100644
--- a/vendor/github.com/creachadair/jrpc2/error.go
+++ b/vendor/github.com/creachadair/jrpc2/error.go
@@ -47,10 +47,6 @@ var errEmptyMethod = &Error{Code: code.InvalidRequest, Message: "empty method na
 // errInvalidRequest is the error reported for an invalid request object or batch.
 var errInvalidRequest = &Error{Code: code.ParseError, Message: "invalid request value"}
 
-// errChannelClosed is the error reported to a pending callback when the client
-// channel has closed before the call completed.
-var errChannelClosed = &Error{Code: code.Cancelled, Message: "client channel terminated"}
-
 // errEmptyBatch is the error reported for an empty request batch.
 var errEmptyBatch = &Error{Code: code.InvalidRequest, Message: "empty request batch"}
 
diff --git a/vendor/github.com/creachadair/jrpc2/examples_test.go b/vendor/github.com/creachadair/jrpc2/examples_test.go
index 3f96071..61c46ed 100644
--- a/vendor/github.com/creachadair/jrpc2/examples_test.go
+++ b/vendor/github.com/creachadair/jrpc2/examples_test.go
@@ -7,52 +7,44 @@ import (
 	"fmt"
 	"log"
 	"strings"
-	"sync"
 
 	"github.com/creachadair/jrpc2"
-	"github.com/creachadair/jrpc2/channel"
 	"github.com/creachadair/jrpc2/code"
 	"github.com/creachadair/jrpc2/handler"
+	"github.com/creachadair/jrpc2/server"
 )
 
 var (
-	s *jrpc2.Server
-
-	ctx      = context.Background()
-	sch, cch = channel.Direct()
-	cli      = jrpc2.NewClient(cch, nil)
-
-	setup sync.Once
+	ctx = context.Background()
 )
 
 type Msg struct {
 	Text string `json:"msg"`
 }
 
-func startServer() {
-	setup.Do(func() {
-		s = jrpc2.NewServer(handler.Map{
-			"Hello": handler.New(func(ctx context.Context) string {
-				return "Hello, world!"
-			}),
-			"Echo": handler.New(func(_ context.Context, args []json.RawMessage) []json.RawMessage {
-				return args
-			}),
-			"Log": handler.New(func(ctx context.Context, msg Msg) (bool, error) {
-				fmt.Println("Log:", msg.Text)
-				return true, nil
-			}),
-		}, nil).Start(sch)
-	})
+func startServer() server.Local {
+	return server.NewLocal(handler.Map{
+		"Hello": handler.New(func(ctx context.Context) string {
+			return "Hello, world!"
+		}),
+		"Echo": handler.New(func(_ context.Context, args []json.RawMessage) []json.RawMessage {
+			return args
+		}),
+		"Log": handler.New(func(ctx context.Context, msg Msg) (bool, error) {
+			fmt.Println("Log:", msg.Text)
+			return true, nil
+		}),
+	}, nil)
 }
 
 func ExampleNewServer() {
 	// Construct a new server with methods "Hello" and "Log".
-	startServer()
+	loc := startServer()
+	defer loc.Close()
 
 	// We can query the server for its current status information, including a
 	// list of its methods.
-	si := s.ServerInfo()
+	si := loc.Server.ServerInfo()
 
 	fmt.Println(strings.Join(si.Methods, "\n"))
 	// Output:
@@ -62,10 +54,10 @@ func ExampleNewServer() {
 }
 
 func ExampleClient_Call() {
-	startServer()
+	loc := startServer()
+	defer loc.Close()
 
-	// var cli = jrpc2.NewClient(cch, nil)
-	rsp, err := cli.Call(ctx, "Hello", nil)
+	rsp, err := loc.Client.Call(ctx, "Hello", nil)
 	if err != nil {
 		log.Fatalf("Call: %v", err)
 	}
@@ -79,11 +71,11 @@ func ExampleClient_Call() {
 }
 
 func ExampleClient_CallResult() {
-	startServer()
+	loc := startServer()
+	defer loc.Close()
 
-	// var cli = jrpc2.NewClient(cch, nil)
 	var msg string
-	if err := cli.CallResult(ctx, "Hello", nil, &msg); err != nil {
+	if err := loc.Client.CallResult(ctx, "Hello", nil, &msg); err != nil {
 		log.Fatalf("CallResult: %v", err)
 	}
 	fmt.Println(msg)
@@ -92,10 +84,10 @@ func ExampleClient_CallResult() {
 }
 
 func ExampleClient_Batch() {
-	startServer()
+	loc := startServer()
+	defer loc.Close()
 
-	// var cli = jrpc2.NewClient(cch, nil)
-	rsps, err := cli.Batch(ctx, []jrpc2.Spec{
+	rsps, err := loc.Client.Batch(ctx, []jrpc2.Spec{
 		{Method: "Hello"},
 		{Method: "Log", Params: Msg{"Sing it!"}, Notify: true},
 	})
@@ -172,8 +164,10 @@ type strictParams struct {
 func (strictParams) DisallowUnknownFields() {}
 
 func ExampleResponse_UnmarshalResult() {
-	// var cli = jrpc2.NewClient(cch, nil)
-	rsp, err := cli.Call(ctx, "Echo", []string{"alpha", "oscar", "kilo"})
+	loc := startServer()
+	defer loc.Close()
+
+	rsp, err := loc.Client.Call(ctx, "Echo", []string{"alpha", "oscar", "kilo"})
 	if err != nil {
 		log.Fatalf("Call: %v", err)
 	}
diff --git a/vendor/github.com/creachadair/jrpc2/handler/handler.go b/vendor/github.com/creachadair/jrpc2/handler/handler.go
index 921d18a..6478fe7 100644
--- a/vendor/github.com/creachadair/jrpc2/handler/handler.go
+++ b/vendor/github.com/creachadair/jrpc2/handler/handler.go
@@ -88,6 +88,17 @@ func New(fn interface{}) Func {
 	return fi.Wrap()
 }
 
+// NewStrict acts as New, but enforces strict field checking on an argument of
+// struct type.
+func NewStrict(fn interface{}) Func {
+	fi, err := Check(fn)
+	if err != nil {
+		panic(err)
+	}
+	fi.strictFields = true
+	return fi.Wrap()
+}
+
 var (
 	ctxType = reflect.TypeOf((*context.Context)(nil)).Elem() // type context.Context
 	errType = reflect.TypeOf((*error)(nil)).Elem()           // type error
@@ -355,8 +366,8 @@ func (o Obj) UnmarshalJSON(data []byte) error {
 	if err := json.Unmarshal(data, &base); err != nil {
 		return filterJSONError("decoding", "object", err)
 	}
-	for key, val := range base {
-		arg, ok := o[key]
+	for key, arg := range o {
+		val, ok := base[key]
 		if !ok {
 			continue
 		} else if err := json.Unmarshal(val, arg); err != nil {
diff --git a/vendor/github.com/creachadair/jrpc2/handler/handler_test.go b/vendor/github.com/creachadair/jrpc2/handler/handler_test.go
index c2aaaac..47fe0cb 100644
--- a/vendor/github.com/creachadair/jrpc2/handler/handler_test.go
+++ b/vendor/github.com/creachadair/jrpc2/handler/handler_test.go
@@ -7,6 +7,7 @@ import (
 	"testing"
 
 	"github.com/creachadair/jrpc2"
+	"github.com/creachadair/jrpc2/code"
 	"github.com/creachadair/jrpc2/handler"
 	"github.com/google/go-cmp/cmp"
 )
@@ -111,6 +112,26 @@ func TestPositional(t *testing.T) {
 	}
 }
 
+func TestNewStrict(t *testing.T) {
+	type arg struct {
+		A, B string
+	}
+	fn := handler.NewStrict(func(ctx context.Context, arg *arg) error { return nil })
+
+	req := mustParseRequest(t, `{
+   "jsonrpc": "2.0",
+   "id":      100,
+   "method":  "f",
+   "params": {
+      "A": "foo",
+      "Z": 25
+   }}`)
+	rsp, err := fn(context.Background(), req)
+	if got := code.FromError(err); got != code.InvalidParams {
+		t.Errorf("Handler returned (%+v, %v), want InvalidParms", rsp, err)
+	}
+}
+
 // Verify that the handling of pointer-typed arguments does not incorrectly
 // introduce another pointer indirection.
 func TestNew_pointerRegression(t *testing.T) {
@@ -120,18 +141,15 @@ func TestNew_pointerRegression(t *testing.T) {
 		t.Logf("Got argument struct: %+v", got)
 		return nil
 	})
-	req, err := jrpc2.ParseRequests([]byte(`{
+	req := mustParseRequest(t, `{
    "jsonrpc": "2.0",
    "id":      "foo",
    "method":  "bar",
    "params":{
       "alpha": "xyzzy",
       "bravo": 23
-   }}`))
-	if err != nil {
-		t.Fatalf("Parse request failed: %v", err)
-	}
-	if _, err := call.Handle(context.Background(), req[0]); err != nil {
+   }}`)
+	if _, err := call.Handle(context.Background(), req); err != nil {
 		t.Errorf("Handle failed: %v", err)
 	}
 	want := argStruct{A: "xyzzy", B: 23}
@@ -165,11 +183,8 @@ func TestPositional_decode(t *testing.T) {
 		{`{"jsonrpc":"2.0","id":6,"method":"add","params":{"unknown":"field"}}`, 0, true},
 	}
 	for _, test := range tests {
-		req, err := jrpc2.ParseRequests([]byte(test.input))
-		if err != nil {
-			t.Fatalf("ParseRequests %#q: unexpected error: %v", test.input, err)
-		}
-		got, err := call(context.Background(), req[0])
+		req := mustParseRequest(t, test.input)
+		got, err := call(context.Background(), req)
 		if !test.bad {
 			if err != nil {
 				t.Errorf("Call %#q: unexpected error: %v", test.input, err)
@@ -360,3 +375,14 @@ func TestObjUnmarshal(t *testing.T) {
 		}
 	}
 }
+
+func mustParseRequest(t *testing.T, text string) *jrpc2.Request {
+	t.Helper()
+	req, err := jrpc2.ParseRequests([]byte(text))
+	if err != nil {
+		t.Fatalf("ParseRequests: %v", err)
+	} else if len(req) != 1 {
+		t.Fatalf("Wrong number of requests: got %d, want 1", len(req))
+	}
+	return req[0]
+}
diff --git a/vendor/github.com/creachadair/jrpc2/opts.go b/vendor/github.com/creachadair/jrpc2/opts.go
index e74dfa7..33ef88b 100644
--- a/vendor/github.com/creachadair/jrpc2/opts.go
+++ b/vendor/github.com/creachadair/jrpc2/opts.go
@@ -278,7 +278,7 @@ func (lg Logger) Printf(msg string, args ...interface{}) {
 }
 
 // StdLogger adapts a *log.Logger to a Logger. If logger == nil, the returned
-// function sends logs to the default logger .
+// function sends logs to the default logger.
 func StdLogger(logger *log.Logger) Logger {
 	if logger == nil {
 		return func(text string) { log.Output(2, text) }
diff --git a/vendor/github.com/creachadair/jrpc2/server.go b/vendor/github.com/creachadair/jrpc2/server.go
index edc5aae..eaac58f 100644
--- a/vendor/github.com/creachadair/jrpc2/server.go
+++ b/vendor/github.com/creachadair/jrpc2/server.go
@@ -465,14 +465,15 @@ func (s *Server) pushReq(ctx context.Context, wantID bool, method string, params
 		id := strconv.FormatInt(s.callID, 10)
 		s.callID++
 
+		cbctx, cancel := context.WithCancel(ctx)
 		jid = json.RawMessage(id)
 		rsp = &Response{
 			ch:     make(chan *jmessage, 1),
 			id:     id,
-			cancel: func() {},
+			cancel: cancel,
 		}
 		s.call[id] = rsp
-		go s.waitCallback(ctx, id, rsp)
+		go s.waitCallback(cbctx, id, rsp)
 	}
 
 	s.log("Posting server %s %q %s", kind, method, string(bits))
@@ -575,11 +576,8 @@ func (s *Server) stop(err error) {
 	// Cancel any in-flight requests that made it out of the queue, and
 	// terminate any pending callback invocations.
 	for id, rsp := range s.call {
-		rsp.ch <- &jmessage{
-			ID: json.RawMessage(id),
-			E:  errChannelClosed,
-		}
 		delete(s.call, id)
+		rsp.cancel()
 	}
 	for id, cancel := range s.used {
 		cancel()
diff --git a/vendor/github.com/creachadair/jrpc2/tools/examples/client/client.go b/vendor/github.com/creachadair/jrpc2/tools/examples/client/client.go
index f89e378..da56f35 100644
--- a/vendor/github.com/creachadair/jrpc2/tools/examples/client/client.go
+++ b/vendor/github.com/creachadair/jrpc2/tools/examples/client/client.go
@@ -65,7 +65,7 @@ func main() {
 	log.Printf("Connected to %v", conn.RemoteAddr())
 
 	// Start up the client, and enable logging to stderr.
-	cli := jrpc2.NewClient(channel.RawJSON(conn, conn), &jrpc2.ClientOptions{
+	cli := jrpc2.NewClient(channel.Line(conn, conn), &jrpc2.ClientOptions{
 		OnNotify: func(req *jrpc2.Request) {
 			var params json.RawMessage
 			req.UnmarshalParams(&params)
diff --git a/vendor/github.com/creachadair/jrpc2/tools/examples/server/server.go b/vendor/github.com/creachadair/jrpc2/tools/examples/server/server.go
index a466640..e5db2e0 100644
--- a/vendor/github.com/creachadair/jrpc2/tools/examples/server/server.go
+++ b/vendor/github.com/creachadair/jrpc2/tools/examples/server/server.go
@@ -96,7 +96,7 @@ func main() {
 		log.Fatalln("Listen:", err)
 	}
 	log.Printf("Listening at %v...", lst.Addr())
-	acc := server.NetAccepter(lst, channel.RawJSON)
+	acc := server.NetAccepter(lst, channel.Line)
 	server.Loop(acc, server.Static(mux), &server.LoopOptions{
 		ServerOptions: &jrpc2.ServerOptions{
 			Logger:      jrpc2.StdLogger(nil),
diff --git a/vendor/github.com/creachadair/jrpc2/tools/go.mod b/vendor/github.com/creachadair/jrpc2/tools/go.mod
index 53cb9ad..465ade4 100644
--- a/vendor/github.com/creachadair/jrpc2/tools/go.mod
+++ b/vendor/github.com/creachadair/jrpc2/tools/go.mod
@@ -3,8 +3,8 @@ module github.com/creachadair/jrpc2/tools
 go 1.17
 
 require (
-	github.com/creachadair/jrpc2 v0.30.1
-	github.com/creachadair/wschannel v0.0.0-20210930050814-ee1a57283ef3
+	github.com/creachadair/jrpc2 v0.30.3
+	github.com/creachadair/wschannel v0.0.0-20211118152247-10d58f4f0def
 )
 
 require (
diff --git a/vendor/github.com/creachadair/jrpc2/tools/go.sum b/vendor/github.com/creachadair/jrpc2/tools/go.sum
index e134828..a9443f1 100644
--- a/vendor/github.com/creachadair/jrpc2/tools/go.sum
+++ b/vendor/github.com/creachadair/jrpc2/tools/go.sum
@@ -1,8 +1,7 @@
-github.com/creachadair/jrpc2 v0.26.0/go.mod h1:w+GXZGc+NwsH0xsUOgeLBIIRM0jBOSTXhv28KaWGRZU=
-github.com/creachadair/jrpc2 v0.30.1 h1:brsyJY1US3f5mxS3IaYoc8kH2O1MNcWUKiBmGswUeE8=
-github.com/creachadair/jrpc2 v0.30.1/go.mod h1:w+GXZGc+NwsH0xsUOgeLBIIRM0jBOSTXhv28KaWGRZU=
-github.com/creachadair/wschannel v0.0.0-20210930050814-ee1a57283ef3 h1:b0LJF4h+tv81wui0UKrszHi+yny5B/UJA10bHimYy0Y=
-github.com/creachadair/wschannel v0.0.0-20210930050814-ee1a57283ef3/go.mod h1:ZW4LjPekGnPGBDEgssmCLAOIObRDGv2SQay/pT+5ZwM=
+github.com/creachadair/jrpc2 v0.30.3 h1:fz8xYfTmIgxJXvr9HAoz0XBOpNklyixE7Hnh6iQP/4o=
+github.com/creachadair/jrpc2 v0.30.3/go.mod h1:w+GXZGc+NwsH0xsUOgeLBIIRM0jBOSTXhv28KaWGRZU=
+github.com/creachadair/wschannel v0.0.0-20211118152247-10d58f4f0def h1:FV0vHCqItsi0b3LwaEKyxj0su3VKdvbenCOkXnCAXnI=
+github.com/creachadair/wschannel v0.0.0-20211118152247-10d58f4f0def/go.mod h1:/9Csuxj8r9h0YXexL0WmkahIhd85BleYWz7nt42ZgDc=
 github.com/google/go-cmp v0.5.6 h1:BKbKCqvP6I+rmFHt06ZmyQtvB8xAkWdhFyr0ZUNZcxQ=
 github.com/google/go-cmp v0.5.6/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/gorilla/websocket v1.4.2 h1:+/TMaTYc4QFitKJxsQ7Yye35DkWvkdLcvGKqM+x0Ufc=
diff --git a/walletapi/transaction_build.go b/walletapi/transaction_build.go
index 57cac46..4ac8195 100644
--- a/walletapi/transaction_build.go
+++ b/walletapi/transaction_build.go
@@ -280,7 +280,7 @@ rebuild_tx:
 		if tx.SCDATA.Has(rpc.SCACTION, rpc.DataUint64) {
 			if rpc.SC_INSTALL == rpc.SC_ACTION(tx.SCDATA.Value(rpc.SCACTION, rpc.DataUint64).(uint64)) {
 				txid := tx.GetHash()
-				if txid[31] < 0x80 { // last byte should be more than 0x80
+				if txid[0] < 0x80 || txid[31] < 0x80 { // last byte should be more than 0x80
 					if retry_count <= 20 {
 						//fmt.Printf("rebuilding tx %s retry_count %d\n", txid, retry_count)
 						goto rebuild_tx