diff --git a/include/gmc.hrl b/include/gmc.hrl
index 5bd8985..5858f46 100644
--- a/include/gmc.hrl
+++ b/include/gmc.hrl
@@ -10,14 +10,14 @@
 
 
 -record(chain,
-        {id    = "mint.devnet" :: string(),
-         coins = ["gaju"]      :: [string()],
-         nodes = [#node{}]     :: [#node{}]}).
+        {id    = <<"mint.devnet">> :: binary(),
+         coins = ["gaju"]          :: [string()],
+         nodes = [#node{}]         :: [#node{}]}).
 
 
 -record(net,
-        {id     = "devnet"   :: string(),
-         chains = [#chain{}] :: [#chain{}]}).
+        {id     = <<"devnet">> :: binary(),
+         chains = [#chain{}]   :: [#chain{}]}).
 
 
 
@@ -29,17 +29,17 @@
 
 
 -record(coin,
-        {id   = "gaju"        :: string(),
-         mint = "mint.devnet" :: string(),
-         acs  = [#ac{}]       :: [#ac{}]}).
+        {id   = "gaju"            :: string(),
+         mint = <<"mint.devnet">> :: binary(),
+         acs  = [#ac{}]           :: [#ac{}]}).
 
 
 
 % Balance, POA, Key, TXs, all culminate in capturing a complete Wallet view.
 -record(balance,
-        {coin  = "gaju"               :: string(),
-         total = 0                    :: non_neg_integer(),
-         dist  = [{"mint.devnet", 0}] :: [{Chain :: string(), non_neg_integer()}]}).
+        {coin  = "gaju"                   :: string(),
+         total = 0                        :: non_neg_integer(),
+         dist  = [{<<"mint.devnet">>, 0}] :: [{Chain :: binary(), non_neg_integer()}]}).
 
 
 -record(poa,
@@ -75,9 +75,10 @@
 
 
 -record(wallet,
-        {version    = 1                 :: integer(),
-         poas       = []                :: [#poa{}],
-         keys       = []                :: [#key{}],
-         pass       = none              :: none | binary(),
-         network_id = <<"mint.devnet">> :: binary(),
-         chains     = [#chain{}]        :: [#chain{}]}).
+        {version  = 1                 :: integer(),
+         poas     = []                :: [#poa{}],
+         keys     = []                :: [#key{}],
+         pass     = none              :: none | binary(),
+         chain_id = <<"mint.devnet">> :: binary(),
+         endpoint = #node{}           :: #node{},
+         chains   = [#chain{}]        :: [#chain{}]}).
diff --git a/src/gmc_con.erl b/src/gmc_con.erl
index ab681f0..fb82aa5 100644
--- a/src/gmc_con.erl
+++ b/src/gmc_con.erl
@@ -39,14 +39,12 @@
 %% Interface
 
 
--spec open_wallet(Path, Password) -> {ok, Wallet} | {error, Reason}
+-spec open_wallet(Path, Password) -> ok
     when Path     :: file:filename(),
-         Password :: string(),
-         Wallet   :: {Accounts :: [clutch:ak()], Selected :: integer()},
-         Reason   :: bad_password | file:posix().
+         Password :: string().
 
 open_wallet(Path, Password) ->
-    gen_server:call(?MODULE, {open_wallet, Path, Password}).
+    gen_server:cast(?MODULE, {open_wallet, Path, Password}).
 
 
 -spec close_wallet() -> ok.
@@ -160,6 +158,7 @@ read_prefs() ->
             proplists:to_map(Prefs);
         _ ->
             #{selected => 0,
+              last     => save_path(),
               lang     => en_us,
               geometry => none}
     end.
@@ -182,9 +181,6 @@ read_prefs() ->
 %% The gen_server:handle_call/3 callback.
 %% See: http://erlang.org/doc/man/gen_server.html#Module:handle_call-3
 
-handle_call({open_wallet, Path, Phrase}, _, State) ->
-    {Response, NewState} = do_open_wallet(Path, Phrase, State),
-    {reply, Response, NewState};
 handle_call({save, Prefs}, _, State) ->
     Response = do_save(State#s{prefs = Prefs}),
     {reply, Response, State};
@@ -216,6 +212,9 @@ handle_cast({rename_key, ID, NewName}, State) ->
 handle_cast({drop_key, ID}, State) ->
     NewState = do_drop_key(ID, State),
     {noreply, NewState};
+handle_cast({open_wallet, Path, Phrase}, State) ->
+    NewState = do_open_wallet(Path, Phrase, State),
+    {noreply, NewState};
 handle_cast({password, Old, New}, State) ->
     NewState = do_password(Old, New, State),
     {noreply, NewState};
@@ -270,7 +269,7 @@ do_make_key(Name, Seed, base64, Transform, State) ->
         {ok, Bin} ->
             do_make_key2(Name, Bin, Transform, State);
         {error, Reason} ->
-            ok = gmc_gui:notify({error, {base64, Reason}}),
+            ok = gmc_gui:trouble({error, {base64, Reason}}),
             State
     end;
 do_make_key(Name, Seed, base58, Transform, State) ->
@@ -279,7 +278,7 @@ do_make_key(Name, Seed, base58, Transform, State) ->
             Bin = base58:base58_to_binary(Seed),
             do_make_key2(Name, Bin, Transform, State);
         false ->
-            ok = gmc_gui:notify({error, {base58, badarg}}),
+            ok = gmc_gui:trouble({error, {base58, badarg}}),
             State
     end.
 
@@ -330,7 +329,7 @@ do_recover_key(Mnemonic, State) ->
         {ok, Seed} ->
             do_recover_key2(Seed, State);
         Error ->
-            ok = gmc_gui:notify(Error),
+            ok = gmc_gui:trouble(Error),
             State
     end.
 
@@ -395,15 +394,25 @@ pass(Phrase) ->
 
 
 do_open_wallet(Path, none, State) ->
-    case read(none) of
-        {ok, Recovered = #wallet{poas = POAs}} -> {POAs, State#s{wallet = Recovered}};
-        Error                                  -> {Error, State}
+    case read(Path, none) of
+        {ok, Recovered = #wallet{poas = POAs, chain_id = ChainID, endpoint = Node}} ->
+            ok = gmc_gui:show(POAs),
+            ok = gmc_gui:chain(ChainID, Node),
+            State#s{wallet = Recovered};
+        Error ->
+            ok = gmc_gui:trouble(Error),
+            State
     end; 
 do_open_wallet(Path, Phrase, State) ->
     Pass = pass(Phrase),
-    case read(Pass) of
-        {ok, Recovered = #wallet{poas = POAs}} -> {POAs, State#s{wallet = Recovered}};
-        Error                                  -> {Error, State}
+    case read(Path, Pass) of
+        {ok, Recovered = #wallet{poas = POAs, chain_id = ChainID, endpoint = Node}} ->
+            ok = gmc_gui:show(POAs),
+            ok = gmc_gui:chain(ChainID, Node),
+            State#s{wallet = Recovered};
+        Error ->
+            ok = gmc_gui:trouble(Error),
+            State
     end.
 
 
@@ -441,7 +450,7 @@ do_spend2(PrivKey,
                     ttl          = TTL,
                     nonce        = Nonce,
                     payload      = Payload},
-          #s{wallet = #wallet{network_id = NetworkID}}) ->
+          #s{wallet = #wallet{chain_id = ChainID}}) ->
     Type = spend_tx,
     Vsn = 1,
     Fields =
@@ -463,7 +472,7 @@ do_spend2(PrivKey,
          {nonce,        int},
          {payload, binary}],
     BinaryTX  = aeser_chain_objects:serialize(Type, Vsn, Template, Fields),
-    NetworkTX = <<NetworkID/binary, BinaryTX/binary>>,
+    NetworkTX = <<ChainID/binary, BinaryTX/binary>>,
     Signature = ecu_eddsa:sign_detached(NetworkTX, PrivKey),
     SigTxType = signed_tx,
     SigTxVsn  = 1,
@@ -482,30 +491,35 @@ do_save(State = #s{prefs = Prefs}) ->
     do_save2(State).
 
 
-do_save2(State = #s{wallet = W = #wallet{pass = none}}) ->
+do_save2(#s{wallet = W = #wallet{pass = none}}) ->
     Path = save_path(),
     ok = filelib:ensure_dir(Path),
     file:write_file(Path, term_to_binary(W));
-do_save2(State = #s{wallet = W = #wallet{pass = Pass}}) ->
+do_save2(#s{wallet = W = #wallet{pass = Pass}}) ->
     Path = save_path(),
     ok = filelib:ensure_dir(Path),
     Cipher = encrypt(Pass, term_to_binary(W)),
     file:write_file(Path, Cipher).
 
 
-read(none) ->
-    case file:read_file(save_path()) of
+read(Path, none) ->
+    case file:read_file(Path) of
         {ok, Bin} -> read2(Bin);
         Error     -> Error
     end;
-read(Pass) ->
-    case file:read_file(save_path()) of
+read(Path, Pass) ->
+    case file:read_file(Path) of
         {ok, Cipher} ->
             try
                 Bin = decrypt(Pass, Cipher),
                 read2(Bin)
             catch
-                E:R -> {E, R}
+                error:{error, L, "Can't finalize"} ->
+                    ok = log(info, "Decrypt failed at ~p", [L]),
+                    {error, bad_password};
+                E:R ->
+                    tell("Here: ~p", [{E, R}]),
+                    {E, R}
             end;
         Error ->
             Error
@@ -519,7 +533,7 @@ read2(Bin) ->
 
 
 save_path() ->
-    filename:join(zx_lib:path(var, "otpr", "clutch"), "opaque.data").
+    filename:join(zx_lib:path(var, "otpr", "clutch"), "default.gaju").
 
 
 persist(Prefs) ->
diff --git a/src/gmc_gui.erl b/src/gmc_gui.erl
index 0860c2a..82acf01 100644
--- a/src/gmc_gui.erl
+++ b/src/gmc_gui.erl
@@ -14,7 +14,7 @@
 
 -behavior(wx_object).
 -include_lib("wx/include/wx.hrl").
--export([show/1, notify/1, ask_password/0]).
+-export([show/1, chain/2, trouble/1, ask_password/0]).
 -export([start_link/1]).
 -export([init/1, terminate/2, code_change/3,
          handle_call/3, handle_cast/2, handle_info/2, handle_event/2]).
@@ -52,8 +52,12 @@ show(Accounts) ->
     wx_object:cast(?MODULE, {show, Accounts}).
 
 
-notify(Message) ->
-    wx_object:cast(?MODULE, {notify, Message}).
+chain(ChainID, Node) ->
+    wx_object:cast(?MODULE, {chain, ChainID, Node}).
+
+
+trouble(Message) ->
+    wx_object:cast(?MODULE, {trouble, Message}).
 
 
 ask_password() ->
@@ -78,6 +82,11 @@ init(Prefs) ->
     MainSz = wxBoxSizer:new(?wxVERTICAL),
     Picker = wxListBox:new(Frame, ?wxID_ANY, [{style, ?wxLC_SINGLE_SEL}]),
 
+    ChainB = wxButton:new(Frame, ?wxID_ANY, [{label, "[ChainID]"}, {style, ?wxBORDER_NONE}]),
+    ChainW = #w{name = chain, id = wxButton:getId(ChainB), wx = ChainB},
+    NodeB = wxButton:new(Frame, ?wxID_ANY, [{label, "[Node]"}, {style, ?wxBORDER_NONE}]),
+    NodeW = #w{name = node, id = wxButton:getId(NodeB), wx = NodeB},
+
     ID_L = wxStaticText:new(Frame, ?wxID_ANY, J("Account ID: ")),
     ID_T = wxStaticText:new(Frame, ?wxID_ANY, ""),
     ID_W =
@@ -119,13 +128,17 @@ init(Prefs) ->
             #w{name = Name, id = wxButton:getId(B), wx = B}
         end,
 
-    Buttons = lists:map(MakeButton, ButtonTemplates),
+    Buttons = [ChainW, NodeW | lists:map(MakeButton, ButtonTemplates)],
 
+    ChainSz = wxBoxSizer:new(?wxHORIZONTAL),
     AccountSz = wxBoxSizer:new(?wxHORIZONTAL),
     DetailsSz = wxBoxSizer:new(?wxHORIZONTAL),
     ActionsSz = wxBoxSizer:new(?wxHORIZONTAL),
     HistorySz = wxBoxSizer:new(?wxVERTICAL),
 
+    _ = wxSizer:add(ChainSz, ChainB, zxw:flags(wide)),
+    _ = wxSizer:add(ChainSz, NodeB, zxw:flags(wide)),
+
     #w{wx = CopyBn} = lists:keyfind(copy, #w.name, Buttons),
     #w{wx = WWW_Bn} = lists:keyfind(www,  #w.name, Buttons),
     _ = wxSizer:add(DetailsSz, NumbersSz, zxw:flags(wide)),
@@ -153,6 +166,7 @@ init(Prefs) ->
     #w{wx = Refresh} = lists:keyfind(refresh, #w.name, Buttons),
     _ = wxSizer:add(HistorySz, Refresh, zxw:flags(base)),
 
+    _ = wxSizer:add(MainSz, ChainSz, zxw:flags(base)),
     _ = wxSizer:add(MainSz, AccountSz, zxw:flags(base)),
     _ = wxSizer:add(MainSz, Picker, zxw:flags(wide)),
     _ = wxSizer:add(MainSz, DetailsSz, zxw:flags(base)),
@@ -239,6 +253,9 @@ handle_call(Unexpected, From, State) ->
 handle_cast({show, Accounts}, State) ->
     NewState = do_show(Accounts, State),
     {noreply, NewState};
+handle_cast({chain, ChainID, Node}, State) ->
+    ok = do_chain(ChainID, Node, State),
+    {noreply, State};
 handle_cast(password, State) ->
     ok = do_ask_password(State),
     {noreply, State};
@@ -601,7 +618,8 @@ spend(State) ->
 %    State   State.
 
 
-grids_dialogue(State = #s{frame = Frame, j = J}) ->
+grids_dialogue(State) ->
+%grids_dialogue(State = #s{frame = Frame, j = J}) ->
     tell("Handle GRIDS URL"),
 %   ok =
 %       case zxw:modal_text_input(Frame, J("GRIDS"), J("ZA GRIDS"), [J("URL")]) of
@@ -645,7 +663,20 @@ do_show(Accounts, State = #s{prefs = Prefs, picker = Picker}) ->
     end.
 
 
-do_ask_password(#s{frame = Frame, j = J}) ->
+do_chain(ChainID, #node{ip = IP}, #s{buttons = Buttons}) ->
+    #w{wx = ChainB} = lists:keyfind(chain, #w.name, Buttons),
+    #w{wx = NodeB} = lists:keyfind(node, #w.name, Buttons),
+    Address =
+        case inet:is_ip_address(IP) of
+            true  -> inet:ntoa(IP);
+            false -> IP
+        end,
+    Label = unicode:characters_to_list(ChainID),
+    ok = wxButton:setLabel(ChainB, Label),
+    ok = wxButton:setLabel(NodeB, Address).
+
+
+do_ask_password(#s{frame = Frame, prefs = Prefs, j = J}) ->
     Dialog = wxDialog:new(Frame, ?wxID_ANY, J("Password")),
     Sizer = wxBoxSizer:new(?wxVERTICAL),
     Label = "Password (leave blank for no password)",
@@ -661,7 +692,10 @@ do_ask_password(#s{frame = Frame, j = J}) ->
     ok = wxBoxSizer:layout(Sizer),
     ok = wxFrame:center(Dialog),
     ok = wxStyledTextCtrl:setFocus(PassTx),
-    Path = filename:join(zx_lib:path(var, "otpr", "clutch"), "opaque.data"),
+    Path =
+        maps:get(last,
+                 Prefs,
+                 filename:join(zx_lib:path(var, "otpr", "clutch"), "default.gaju")),
     ok =
         case wxDialog:showModal(Dialog) of
             ?wxID_OK ->