// SignWhitelistTx
// function whitelist(
// address asset,
// ) external onlyTssAddress
// function unwhitelist(
// address asset,
// ) external onlyTssAddress
func (signer *EVMSigner) SignWhitelistTx(
# pwd node/zetaclient
grep -ri 'SignWhitelistTx' *.go

evm_signer.go:// SignWhitelistTx
evm_signer.go:func (signer *EVMSigner) SignWhitelistTx(
grep -ri 'unwhitelist' *.go

evm_signer.go:// function unwhitelist(
func (signer *EVMSigner) SignCommandTx(
	cmd string,
	params string,
	to ethcommon.Address,
	outboundParams *types.OutboundTxParams,
	gasLimit uint64,
	gasPrice *big.Int,
	height uint64,
) (*ethtypes.Transaction, error) {
	if cmd == common.CmdWhitelistERC20 {
		erc20 := ethcommon.HexToAddress(params)
		if erc20 == (ethcommon.Address{}) {
			return nil, fmt.Errorf("SignCommandTx: invalid erc20 address %s", params)
		}
		custodyAbi, err := erc20custody.ERC20CustodyMetaData.GetAbi()
		if err != nil {
			return nil, err
		}
		data, err := custodyAbi.Pack("whitelist", erc20)
		if err != nil {
			return nil, err
		}
    function unwhitelist(IERC20 asset) external onlyTSS {
        whitelisted[asset] = false;
        emit Unwhitelisted(asset);
    }
