diff --git a/blockutil.go b/blockutil.go
index 0cb70dc..f93625b 100644
--- a/blockutil.go
+++ b/blockutil.go
@@ -11,6 +11,7 @@ package main
 import (
 	"crypto/dsa"
 	"crypto/rand"
+	"crypto/sha256"
 	"encoding/json"
 	"fmt"
 	"io"
@@ -91,7 +92,8 @@ func Send(receiver string, amount string) {
 	key := GetKey()
 	sender := key.PublicKey.Y
 	parametersString := fmt.Sprintf("&%s&%s&%s", key.PublicKey.Parameters.P, key.PublicKey.Parameters.Q, key.PublicKey.Parameters.G)
-	r, s, err := dsa.Sign(rand.Reader, &key, []byte(fmt.Sprintf("%s:%s:%s", sender, receiver, amount)))
+	hash := sha256.Sum256([]byte(fmt.Sprintf("%s:%s:%s", sender, receiver, amount)))
+	r, s, err := dsa.Sign(rand.Reader, &key, hash[:])
 	if err != nil {
 		panic(err)
 	}
diff --git a/builds/node/node_darwin-amd64 b/builds/node/node_darwin-amd64
index 732783c..7286437 100755
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diff --git a/builds/node/node_darwin-arm64 b/builds/node/node_darwin-arm64
index 84db7c0..027f445 100755
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diff --git a/builds/node/node_linux-386 b/builds/node/node_linux-386
index 87e84b8..0ff8b39 100755
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diff --git a/builds/node/node_linux-amd64 b/builds/node/node_linux-amd64
index 4d03521..bdc0c71 100755
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diff --git a/builds/node/node_linux-arm b/builds/node/node_linux-arm
index f195af8..f021080 100755
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diff --git a/builds/node/node_linux-arm64 b/builds/node/node_linux-arm64
index 56b2249..bab081a 100755
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diff --git a/builds/node/node_windows-386 b/builds/node/node_windows-386
index 9c0d990..352a5b5 100755
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diff --git a/builds/node/node_windows-amd64 b/builds/node/node_windows-amd64
index 7c08a6c..3db2462 100755
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diff --git a/builds/node/node_windows-arm b/builds/node/node_windows-arm
index e6d8b03..9537004 100755
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diff --git a/builds/node/node_windows-arm64 b/builds/node/node_windows-arm64
index 8a16342..957410e 100755
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diff --git a/verify.go b/verify.go
index 16ba1cf..c9d0774 100644
--- a/verify.go
+++ b/verify.go
@@ -10,6 +10,7 @@ package main
 
 import (
 	"crypto/dsa"
+	"crypto/sha256"
 	"encoding/binary"
 	"fmt"
 	"math/big"
@@ -21,7 +22,8 @@ func VerifyTransaction(senderKey dsa.PublicKey, recipientKey dsa.PublicKey, amou
 	if err != nil {
 		panic(err)
 	}
-	isValid := dsa.Verify(&senderKey, []byte(fmt.Sprintf("%s:%s:%s", senderKey.Y, recipientKey.Y, strconv.FormatFloat(amountFloat, 'f', -1, 64))), &r, &s)
+	hash := sha256.Sum256([]byte(fmt.Sprintf("%s:%s:%f", senderKey.Y, recipientKey.Y, amountFloat)))
+	isValid := dsa.Verify(&senderKey, hash[:], &r, &s)
 	if !isValid {
 		return false
 	}