diff --git a/job.go b/job.go
index f327c29..836d0e3 100644
--- a/job.go
+++ b/job.go
@@ -15,13 +15,13 @@ import (
 //	    Algo:   "cn/r",
 //	}
 type Job struct {
-	Blob     string // hex-encoded block template (160 hex chars = 80 bytes)
-	JobID    string // pool-assigned identifier
-	Target   string // 8-char hex little-endian uint32 difficulty target
-	Algo     string // algorithm e.g. "cn/r", "rx/0"; "" if not negotiated
-	Height   uint64 // block height (0 if pool did not provide)
-	SeedHash string // RandomX seed hash hex (empty if not RandomX)
-	ClientID string // pool session ID that issued this job (for stale detection)
+	Blob     string `json:"blob"`      // hex-encoded block template (160 hex chars = 80 bytes)
+	JobID    string `json:"job_id"`    // pool-assigned identifier
+	Target   string `json:"target"`    // 8-char hex little-endian uint32 difficulty target
+	Algo     string `json:"algo"`      // algorithm e.g. "cn/r", "rx/0"; "" if not negotiated
+	Height   uint64 `json:"height"`    // block height (0 if pool did not provide)
+	SeedHash string `json:"seed_hash"` // RandomX seed hash hex (empty if not RandomX)
+	ClientID string `json:"id"`        // pool session ID that issued this job (for stale detection)
 }
 
 // IsValid returns true if Blob and JobID are non-empty.
diff --git a/job_test.go b/job_test.go
index 90c9f47..3bcba34 100644
--- a/job_test.go
+++ b/job_test.go
@@ -1,6 +1,9 @@
 package proxy
 
-import "testing"
+import (
+	"encoding/json"
+	"testing"
+)
 
 func TestJob_IsValid_Good(t *testing.T) {
 	job := Job{Blob: "abcd", JobID: "job-1"}
@@ -70,3 +73,13 @@ func TestJob_DifficultyFromTarget_Ugly(t *testing.T) {
 		t.Fatalf("expected maximum target to resolve to difficulty 1, got %d", got)
 	}
 }
+
+func TestJob_JSON_Unmarshal_Good(t *testing.T) {
+	var job Job
+	if err := json.Unmarshal([]byte(`{"blob":"abcd","job_id":"job-1","target":"b88d0600","algo":"cn/r","height":42,"seed_hash":"seed","id":"session-1"}`), &job); err != nil {
+		t.Fatal(err)
+	}
+	if job.JobID != "job-1" || job.SeedHash != "seed" || job.ClientID != "session-1" {
+		t.Fatalf("unexpected decoded job: %+v", job)
+	}
+}
diff --git a/miner_methods.go b/miner_methods.go
index c8bd47b..05905f0 100644
--- a/miner_methods.go
+++ b/miner_methods.go
@@ -84,6 +84,14 @@ func (m *Miner) SetRouteID(value int64)        { m.routeID = value }
 func (m *Miner) SetCustomDiff(value uint64)    { m.customDiff = value }
 func (m *Miner) SetNiceHashEnabled(value bool) { m.extNH = value }
 
+func (m *Miner) PrimeJob(job Job) {
+	if m == nil || !job.IsValid() {
+		return
+	}
+	m.currentJob = &job
+	m.diff = job.DifficultyFromTarget()
+}
+
 func (m *Miner) Touch() {
 	m.lastActivityAt = time.Now().UTC()
 }
diff --git a/miner_runtime.go b/miner_runtime.go
index 59f8d4e..07385df 100644
--- a/miner_runtime.go
+++ b/miner_runtime.go
@@ -223,8 +223,12 @@ func (m *Miner) handleLogin(request minerRequest) {
 	}
 	if m.currentJob != nil && m.currentJob.IsValid() {
 		jobCopy := *m.currentJob
+		blob := jobCopy.Blob
+		if m.extNH {
+			blob = jobCopy.BlobWithFixedByte(m.fixedByte)
+		}
 		jobResult := map[string]interface{}{
-			"blob":   jobCopy.Blob,
+			"blob":   blob,
 			"job_id": jobCopy.JobID,
 			"target": jobCopy.Target,
 			"id":     m.rpcID,
diff --git a/miner_runtime_test.go b/miner_runtime_test.go
index 18ad9c8..7518e55 100644
--- a/miner_runtime_test.go
+++ b/miner_runtime_test.go
@@ -169,3 +169,59 @@ func TestMiner_Login_Ugly(t *testing.T) {
 		t.Fatalf("expected algo extension to be advertised, got %#v", response)
 	}
 }
+
+func TestMiner_Login_NiceHashPatchedJob_Good(t *testing.T) {
+	serverConn, clientConn := net.Pipe()
+	defer clientConn.Close()
+
+	miner := NewMiner(serverConn, 3333, nil)
+	miner.algoExtension = true
+	miner.events = NewEventBus()
+	miner.events.Subscribe(EventLogin, func(event Event) {
+		if event.Miner == nil {
+			return
+		}
+		event.Miner.SetNiceHashEnabled(true)
+		event.Miner.SetFixedByte(0x2a)
+		event.Miner.PrimeJob(Job{
+			Blob:   "000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+			JobID:  "job-1",
+			Target: "b88d0600",
+			Algo:   "cn/r",
+		})
+	})
+	miner.Start()
+	defer miner.Close()
+
+	encoder := json.NewEncoder(clientConn)
+	if err := encoder.Encode(map[string]interface{}{
+		"id":      5,
+		"jsonrpc": "2.0",
+		"method":  "login",
+		"params": map[string]interface{}{
+			"login": "wallet",
+			"pass":  "x",
+			"agent": "xmrig",
+			"algo":  []string{"cn/r"},
+		},
+	}); err != nil {
+		t.Fatal(err)
+	}
+
+	clientConn.SetReadDeadline(time.Now().Add(time.Second))
+	line, err := bufio.NewReader(clientConn).ReadBytes('\n')
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	var response map[string]interface{}
+	if err := json.Unmarshal(line, &response); err != nil {
+		t.Fatal(err)
+	}
+
+	result := response["result"].(map[string]interface{})
+	job := result["job"].(map[string]interface{})
+	if blob, _ := job["blob"].(string); blob[78:80] != "2a" {
+		t.Fatalf("expected patched NiceHash blob, got %q", blob)
+	}
+}
diff --git a/pool/strategy.go b/pool/strategy.go
index 909737f..9fa6724 100644
--- a/pool/strategy.go
+++ b/pool/strategy.go
@@ -19,6 +19,8 @@ type FailoverStrategy struct {
 	client   *StratumClient
 	listener StratumListener
 	cfg      *proxy.Config
+	closed   bool
+	running  bool
 	mu       sync.Mutex
 }
 
@@ -65,10 +67,27 @@ func NewFailoverStrategy(pools []proxy.PoolConfig, listener StratumListener, cfg
 //	strategy.Connect()
 func (s *FailoverStrategy) Connect() {
 	s.mu.Lock()
-	defer s.mu.Unlock()
+	s.closed = false
+	s.mu.Unlock()
+	s.connectFrom(0)
+}
+
+func (s *FailoverStrategy) connectFrom(start int) {
+	s.mu.Lock()
+	if s.running || s.closed {
+		s.mu.Unlock()
+		return
+	}
+	s.running = true
+	s.mu.Unlock()
+	defer func() {
+		s.mu.Lock()
+		s.running = false
+		s.mu.Unlock()
+	}()
 
 	pools := s.pools
-	if s.cfg != nil {
+	if s.cfg != nil && len(s.cfg.Pools) > 0 {
 		pools = s.cfg.Pools
 	}
 	if len(pools) == 0 {
@@ -87,15 +106,24 @@ func (s *FailoverStrategy) Connect() {
 	}
 
 	for attempt := 0; attempt < retries; attempt++ {
-		for index, poolConfig := range pools {
+		for offset := 0; offset < len(pools); offset++ {
+			index := (start + offset) % len(pools)
+			poolConfig := pools[index]
 			if !poolConfig.Enabled {
 				continue
 			}
 
-			client := NewStratumClient(poolConfig, s.listener)
+			client := NewStratumClient(poolConfig, s)
 			if errorValue := client.Connect(); errorValue == nil {
+				s.mu.Lock()
+				if s.closed {
+					s.mu.Unlock()
+					client.Disconnect()
+					return
+				}
 				s.client = client
 				s.current = index
+				s.mu.Unlock()
 				client.Login()
 				return
 			}
@@ -119,6 +147,7 @@ func (s *FailoverStrategy) Submit(jobID string, nonce string, result string, alg
 
 func (s *FailoverStrategy) Disconnect() {
 	s.mu.Lock()
+	s.closed = true
 	client := s.client
 	s.client = nil
 	s.mu.Unlock()
@@ -132,3 +161,37 @@ func (s *FailoverStrategy) IsActive() bool {
 	defer s.mu.Unlock()
 	return s.client != nil && s.client.active
 }
+
+func (s *FailoverStrategy) OnJob(job proxy.Job) {
+	if s.listener != nil {
+		s.listener.OnJob(job)
+	}
+}
+
+func (s *FailoverStrategy) OnResultAccepted(sequence int64, accepted bool, errorMessage string) {
+	if s.listener != nil {
+		s.listener.OnResultAccepted(sequence, accepted, errorMessage)
+	}
+}
+
+func (s *FailoverStrategy) OnDisconnect() {
+	s.mu.Lock()
+	client := s.client
+	s.client = nil
+	closed := s.closed
+	s.mu.Unlock()
+
+	if s.listener != nil {
+		s.listener.OnDisconnect()
+	}
+	if closed {
+		return
+	}
+	if client != nil {
+		client.active = false
+	}
+	go func() {
+		time.Sleep(10 * time.Millisecond)
+		s.connectFrom(0)
+	}()
+}
diff --git a/pool/strategy_test.go b/pool/strategy_test.go
new file mode 100644
index 0000000..0076c5c
--- /dev/null
+++ b/pool/strategy_test.go
@@ -0,0 +1,110 @@
+package pool
+
+import (
+	"bufio"
+	"encoding/json"
+	"net"
+	"sync"
+	"testing"
+	"time"
+
+	"dappco.re/go/core/proxy"
+)
+
+type strategyTestListener struct {
+	jobCh        chan proxy.Job
+	disconnectMu sync.Mutex
+	disconnects  int
+}
+
+func (l *strategyTestListener) OnJob(job proxy.Job) {
+	l.jobCh <- job
+}
+
+func (l *strategyTestListener) OnResultAccepted(sequence int64, accepted bool, errorMessage string) {}
+
+func (l *strategyTestListener) OnDisconnect() {
+	l.disconnectMu.Lock()
+	l.disconnects++
+	l.disconnectMu.Unlock()
+}
+
+func (l *strategyTestListener) Disconnects() int {
+	l.disconnectMu.Lock()
+	defer l.disconnectMu.Unlock()
+	return l.disconnects
+}
+
+func TestFailoverStrategy_Connect_Ugly(t *testing.T) {
+	primaryListener, err := net.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer primaryListener.Close()
+
+	backupListener, err := net.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer backupListener.Close()
+
+	go func() {
+		conn, acceptErr := primaryListener.Accept()
+		if acceptErr != nil {
+			return
+		}
+		_ = primaryListener.Close()
+		_ = conn.Close()
+	}()
+
+	go func() {
+		conn, acceptErr := backupListener.Accept()
+		if acceptErr != nil {
+			return
+		}
+		defer conn.Close()
+
+		reader := bufio.NewReader(conn)
+		if _, readErr := reader.ReadBytes('\n'); readErr != nil {
+			return
+		}
+
+		_ = json.NewEncoder(conn).Encode(map[string]interface{}{
+			"id":      1,
+			"jsonrpc": "2.0",
+			"error":   nil,
+			"result": map[string]interface{}{
+				"id": "session-1",
+				"job": map[string]interface{}{
+					"blob":   "abcd",
+					"job_id": "job-1",
+					"target": "b88d0600",
+				},
+			},
+		})
+	}()
+
+	listener := &strategyTestListener{
+		jobCh: make(chan proxy.Job, 1),
+	}
+	strategy := NewFailoverStrategy([]proxy.PoolConfig{
+		{URL: primaryListener.Addr().String(), Enabled: true},
+		{URL: backupListener.Addr().String(), Enabled: true},
+	}, listener, &proxy.Config{Retries: 2})
+
+	strategy.Connect()
+	defer strategy.Disconnect()
+
+	select {
+	case job := <-listener.jobCh:
+		if job.JobID != "job-1" {
+			t.Fatalf("expected backup job, got %+v", job)
+		}
+	case <-time.After(3 * time.Second):
+		t.Fatal("expected failover job after primary disconnect")
+	}
+
+	if listener.Disconnects() == 0 {
+		t.Fatal("expected disconnect callback before failover reconnect")
+	}
+}
diff --git a/splitter/nicehash/mapper.go b/splitter/nicehash/mapper.go
index b532160..20d8eb5 100644
--- a/splitter/nicehash/mapper.go
+++ b/splitter/nicehash/mapper.go
@@ -30,10 +30,11 @@ type NonceMapper struct {
 //
 //	ctx := SubmitContext{RequestID: 42, MinerID: 7}
 type SubmitContext struct {
-	RequestID int64 // JSON-RPC id from the miner's submit request
-	MinerID   int64 // miner that submitted
-	JobID     string
-	Expired   bool
+	RequestID   int64 // JSON-RPC id from the miner's submit request
+	MinerID     int64 // miner that submitted
+	JobID       string
+	Expired     bool
+	SubmittedAt time.Time
 }
 
 // NewNonceMapper creates one upstream pool mapper and its local slot table.
@@ -93,10 +94,11 @@ func (m *NonceMapper) Submit(event *proxy.SubmitEvent) {
 	}
 	m.mu.Lock()
 	m.pending[sequence] = SubmitContext{
-		RequestID: event.RequestID,
-		MinerID:   event.Miner.ID(),
-		JobID:     event.JobID,
-		Expired:   expired,
+		RequestID:   event.RequestID,
+		MinerID:     event.Miner.ID(),
+		JobID:       event.JobID,
+		Expired:     expired,
+		SubmittedAt: time.Now().UTC(),
 	}
 	m.mu.Unlock()
 }
@@ -144,12 +146,24 @@ func (m *NonceMapper) OnResultAccepted(sequence int64, accepted bool, errorMessa
 
 	if m.events != nil {
 		jobCopy := m.storage.CurrentJob()
+		latency := uint16(0)
+		if !context.SubmittedAt.IsZero() {
+			elapsed := time.Since(context.SubmittedAt).Milliseconds()
+			if elapsed > 0 {
+				if elapsed > int64(^uint16(0)) {
+					latency = ^uint16(0)
+				} else {
+					latency = uint16(elapsed)
+				}
+			}
+		}
 		m.events.Dispatch(proxy.Event{
 			Type:    eventType,
 			Miner:   miner,
 			Job:     jobCopy,
 			Diff:    miner.Diff(),
 			Error:   errorMessage,
+			Latency: latency,
 			Expired: context.Expired,
 		})
 	}
diff --git a/splitter/nicehash/splitter.go b/splitter/nicehash/splitter.go
index f4aa086..7a16a43 100644
--- a/splitter/nicehash/splitter.go
+++ b/splitter/nicehash/splitter.go
@@ -69,7 +69,7 @@ func (s *NonceSplitter) OnLogin(event *proxy.LoginEvent) {
 			event.Miner.SetMapperID(mapper.id)
 			event.Miner.SetNiceHashEnabled(true)
 			if currentJob := mapper.storage.CurrentJob(); currentJob != nil && currentJob.IsValid() {
-				event.Miner.ForwardJob(*currentJob, currentJob.Algo)
+				event.Miner.PrimeJob(*currentJob)
 			}
 			return
 		}
@@ -83,7 +83,7 @@ func (s *NonceSplitter) OnLogin(event *proxy.LoginEvent) {
 		event.Miner.SetMapperID(mapper.id)
 		event.Miner.SetNiceHashEnabled(true)
 		if currentJob := mapper.storage.CurrentJob(); currentJob != nil && currentJob.IsValid() {
-			event.Miner.ForwardJob(*currentJob, currentJob.Algo)
+			event.Miner.PrimeJob(*currentJob)
 		}
 	}
 }
diff --git a/splitter/simple/mapper.go b/splitter/simple/mapper.go
index e80beda..c736db2 100644
--- a/splitter/simple/mapper.go
+++ b/splitter/simple/mapper.go
@@ -27,8 +27,9 @@ type SimpleMapper struct {
 }
 
 type simpleSubmitContext struct {
-	RequestID int64
-	Expired   bool
+	RequestID   int64
+	Expired     bool
+	SubmittedAt time.Time
 }
 
 // NewSimpleMapper stores the mapper ID and strategy.
@@ -90,15 +91,17 @@ func (m *SimpleMapper) OnResultAccepted(sequence int64, accepted bool, errorMess
 	}
 
 	if accepted {
+		latency := shareLatency(context.SubmittedAt)
 		if m.events != nil {
-			m.events.Dispatch(proxy.Event{Type: proxy.EventAccept, Miner: miner, Diff: miner.Diff(), Expired: context.Expired})
+			m.events.Dispatch(proxy.Event{Type: proxy.EventAccept, Miner: miner, Job: m.currentJob(), Diff: miner.Diff(), Latency: latency, Expired: context.Expired})
 		}
 		miner.Success(context.RequestID, "OK")
 		return
 	}
 
+	latency := shareLatency(context.SubmittedAt)
 	if m.events != nil {
-		m.events.Dispatch(proxy.Event{Type: proxy.EventReject, Miner: miner, Diff: miner.Diff(), Error: errorMessage, Expired: context.Expired})
+		m.events.Dispatch(proxy.Event{Type: proxy.EventReject, Miner: miner, Job: m.currentJob(), Diff: miner.Diff(), Error: errorMessage, Latency: latency, Expired: context.Expired})
 	}
 	miner.ReplyWithError(context.RequestID, errorMessage)
 }
@@ -106,3 +109,27 @@ func (m *SimpleMapper) OnResultAccepted(sequence int64, accepted bool, errorMess
 func (m *SimpleMapper) OnDisconnect() {
 	m.stopped = true
 }
+
+func (m *SimpleMapper) currentJob() *proxy.Job {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if !m.job.IsValid() {
+		return nil
+	}
+	job := m.job
+	return &job
+}
+
+func shareLatency(submittedAt time.Time) uint16 {
+	if submittedAt.IsZero() {
+		return 0
+	}
+	elapsed := time.Since(submittedAt).Milliseconds()
+	if elapsed <= 0 {
+		return 0
+	}
+	if elapsed > int64(^uint16(0)) {
+		return ^uint16(0)
+	}
+	return uint16(elapsed)
+}
diff --git a/splitter/simple/splitter.go b/splitter/simple/splitter.go
index 571a916..31a8ef2 100644
--- a/splitter/simple/splitter.go
+++ b/splitter/simple/splitter.go
@@ -90,7 +90,7 @@ func (s *SimpleSplitter) OnLogin(event *proxy.LoginEvent) {
 	currentJob := mapper.job
 	mapper.mu.Unlock()
 	if currentJob.IsValid() {
-		event.Miner.ForwardJob(currentJob, currentJob.Algo)
+		event.Miner.PrimeJob(currentJob)
 	}
 }
 
@@ -120,8 +120,9 @@ func (s *SimpleSplitter) OnSubmit(event *proxy.SubmitEvent) {
 
 	mapper.mu.Lock()
 	mapper.pending[sequence] = simpleSubmitContext{
-		RequestID: event.RequestID,
-		Expired:   expired,
+		RequestID:   event.RequestID,
+		Expired:     expired,
+		SubmittedAt: time.Now().UTC(),
 	}
 	mapper.mu.Unlock()
 }