diff --git a/cmd/cpuminerd/mine.go b/cmd/cpuminerd/mine.go
index bdd078f..7b399ec 100644
--- a/cmd/cpuminerd/mine.go
+++ b/cmd/cpuminerd/mine.go
@@ -86,7 +86,7 @@ func mineBlock(ctx context.Context, cs consensus.State, txns []types.Transaction
 				return
 			case <-time.After(10 * time.Second):
 				rate := float64(atomic.LoadUint64(&hashes)) / time.Since(start).Seconds()
-				log.Debug("mining", zap.Float64("rate", rate), zap.Int("workers", workers))
+				log.Info("mining", zap.Float64("rate", rate), zap.Int("workers", workers))
 			}
 		}
 	}()
@@ -95,8 +95,8 @@ func mineBlock(ctx context.Context, cs consensus.State, txns []types.Transaction
 	for i := 0; i < workers; i++ {
 		workerBuf := make([]byte, len(buf))
 		copy(workerBuf, buf)
+		log := log.With(zap.Int("worker", i+1))
 		go func(n int, nonce uint64, buf []byte) {
-
 			for {
 				select {
 				case <-ctx.Done():
@@ -106,9 +106,10 @@ func mineBlock(ctx context.Context, cs consensus.State, txns []types.Transaction
 					h := types.BlockID(types.HashBytes(buf))
 					atomic.AddUint64(&hashes, 1)
 					if h.CmpWork(cs.ChildTarget) < 0 {
+						log.Debug("bad nonce", zap.Uint64("nonce", nonce))
 						continue
 					}
-
+					log.Debug("found nonce", zap.Uint64("nonce", nonce))
 					select {
 					case resultCh <- nonce:
 					default: