diff --git a/proofofwork.go b/proofofwork.go
index fe55525..967a4bc 100644
--- a/proofofwork.go
+++ b/proofofwork.go
@@ -12,7 +12,7 @@ var (
 	maxNonce = math.MaxInt64
 )
 
-const targetBits = 24
+const targetBits = 16
 
 // ProofOfWork represents a proof-of-work
 type ProofOfWork struct {