fix a bug

go.mod

@@ -56,7 +56,6 @@ require (
 	google.golang.org/protobuf v1.27.1
 	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
 	gopkg.in/yaml.v2 v2.4.0
-	nhooyr.io/websocket v1.8.6 // indirect
 )
 
 replace (

x/auth/ante/sigverify.go

@@ -264,11 +264,18 @@ func (svd SigVerificationDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simul
 		}
 
 		// Check account sequence number.
-		if sig.Sequence != acc.GetSequence() {
-			return ctx, sdkerrors.Wrapf(
-				sdkerrors.ErrWrongSequence,
-				"account sequence mismatch, expected %d, got %d", acc.GetSequence(), sig.Sequence,
-			)
+		// When using Amino StdSignatures, we actually don't have the Sequence in
+		// the SignatureV2 struct (it's only in the SignDoc). In this case, we
+		// cannot check sequence directly, and must do it via signature
+		// verification (in the VerifySignature call below).
+		onlyAminoSigners := OnlyLegacyAminoSigners(sig.Data)
+		if !onlyAminoSigners {
+			if sig.Sequence != acc.GetSequence() {
+				return ctx, sdkerrors.Wrapf(
+					sdkerrors.ErrWrongSequence,
+					"account sequence mismatch, expected %d, got %d", acc.GetSequence(), sig.Sequence,
+				)
+			}
 		}
 
 		// retrieve signer data