diff --git a/x/cert/keeper/keeper.go b/x/cert/keeper/keeper.go
index fdc7c2560..9b7a28548 100644
--- a/x/cert/keeper/keeper.go
+++ b/x/cert/keeper/keeper.go
@@ -2,6 +2,7 @@ package keeper
 
 import (
 	"github.com/cosmos/cosmos-sdk/codec"
+	"github.com/cosmos/cosmos-sdk/store/prefix"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 
 	types "github.com/akash-network/akash-api/go/node/cert/v1beta3"
@@ -137,7 +138,8 @@ func (k keeper) WithCertificates(ctx sdk.Context, fn func(certificate types.Cert
 
 // WithCertificates1 iterates all certificates
 func (k keeper) WithCertificates1(ctx sdk.Context, fn func(id types.CertID, certificate types.CertificateResponse) bool) {
-	store := ctx.KVStore(k.skey)
+	store := prefix.NewStore(ctx.KVStore(k.skey), types.PrefixCertificateID())
+
 	iter := store.Iterator(nil, nil)
 
 	defer func() {
diff --git a/x/cert/keeper/key.go b/x/cert/keeper/key.go
index b75ccefad..0c4573ccd 100644
--- a/x/cert/keeper/key.go
+++ b/x/cert/keeper/key.go
@@ -56,22 +56,15 @@ func parseCertID(from []byte) (types.CertID, error) {
 		Serial: *big.NewInt(0),
 	}
 
-	// first byte is prefix id. skip it
-	from = from[1:]
-	addLen := from[0]
+	owner := make([]byte, from[0])
+	offset := copy(owner, from[1:])
+	offset++
 
-	from = from[1:]
+	res.Owner = sdk.AccAddress(owner)
+	res.Serial.SetBytes(from[offset:])
 
-	addr := from[:addLen-1]
-	serial := from[addLen:]
-
-	err := sdk.VerifyAddressFormat(addr)
-	if err != nil {
-		return res, err
-	}
-
-	res.Owner = sdk.AccAddress(addr)
-	res.Serial.SetBytes(serial)
+	strOwner := res.Owner.String()
+	_ = strOwner
 
 	return res, nil
 }