   if strings.EqualFold(destAddr, cfgDest.ZetaTokenContractAddress) {
	ob.logger.ExternalChainWatcher.Warn().Msgf("potential attack attempt: %s destination address is ZETA token contract address %s", destChain, destAddr)
        return types.MsgVoteOnObservedInboundTx{}, fmt.Errorf("potential attack attempt: %s destination address is ZETA token contract address %s", destChain, destAddr)
   }
func (k Keeper) ProcessZetaSentEvent(ctx sdk.Context, event *connectorzevm.ZetaConnectorZEVMZetaSent, emittingContract ethcommon.Address, txOrigin string) error {
	if !k.zetaObserverKeeper.IsInboundEnabled(ctx) {
		return types.ErrNotEnoughPermissions
	}

        ...

	receiverChainID := event.DestinationChainId
	receiverChain := k.zetaObserverKeeper.GetParams(ctx).GetChainFromChainID(receiverChainID.Int64())
	if receiverChain == nil {
		return zetaObserverTypes.ErrSupportedChains
	}

	// Validation if we want to send ZETA to an external chain, but there is no ZETA token.
	coreParams, found := k.zetaObserverKeeper.GetCoreParamsByChainID(ctx, receiverChain.ChainId)
	if !found {
		return types.ErrNotFoundCoreParams
	}

+	toAddr, err := receiverChain.EncodeAddress(event.DestinationAddress)
+	if err != nil {
+		return fmt.Errorf("cannot encode address %s: %s", event.DestinationAddress, err.Error())
+	}
+
+       // The ZETA token itself cannot own any tokens, potential attack.
+	if strings.EqualFold(toAddr, coreParams.ZetaTokenContractAddress)) {
+		return types.ErrUnableToSendCoinType
+	}
	if receiverChain.IsExternalChain() && coreParams.ZetaTokenContractAddress == "" {
		return types.ErrUnableToSendCoinType
	}
-	toAddr := "0x" + hex.EncodeToString(event.DestinationAddress)
	senderChain := common.ZetaChain()
	amount := math.NewUintFromBigInt(event.ZetaValueAndGas)

        ...
