upgrade drand version

go.mod

@@ -6,9 +6,9 @@ require (
 	github.com/coreos/bbolt v1.3.3 // indirect
 	github.com/dgraph-io/badger/v2 v2.0.2
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
-	github.com/drand/drand v0.5.4
+	github.com/drand/drand v0.8.1
 	github.com/gobuffalo/packr/v2 v2.7.1
-	github.com/golang/protobuf v1.3.4
+	github.com/golang/protobuf v1.3.5
 	github.com/gorilla/websocket v1.4.1
 	github.com/iotaledger/hive.go v0.0.0-20200430073924-0e16f8c3a522
 	github.com/iotaledger/iota.go v1.0.0-beta.14
@@ -25,8 +25,8 @@ require (
 	go.dedis.ch/kyber/v3 v3.0.12
 	go.uber.org/atomic v1.6.0
 	go.uber.org/zap v1.14.0
-	golang.org/x/crypto v0.0.0-20200302210943-78000ba7a073
-	golang.org/x/net v0.0.0-20200301022130-244492dfa37a
+	golang.org/x/crypto v0.0.0-20200429183012-4b2356b1ed79
+	golang.org/x/net v0.0.0-20200425230154-ff2c4b7c35a0
 	golang.org/x/tools v0.0.0-20200330040139-fa3cc9eebcfe // indirect
 	google.golang.org/grpc v1.28.1
 	gopkg.in/src-d/go-git.v4 v4.13.1

packages/binary/drng/subtypes/collectiveBeacon/collective_beacon.go

@@ -100,7 +100,7 @@ func verifySignature(data *events.CollectiveBeaconEvent) error {
 		return err
 	}
 
-	msg := beacon.Message(data.PrevSignature, data.Round)
+	msg := beacon.Message(data.Round, data.PrevSignature)
 
 	if err := key.Scheme.VerifyRecovered(dpk, msg, data.Signature); err != nil {
 		return err