Make 'extensions' field the empty string.

Not the empty list.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/v1.erl b/src/v1.erl
index 32dabab..9f454fc 100644
--- a/src/v1.erl
+++ b/src/v1.erl
@@ -17,7 +17,7 @@ add_chain(SessionID, _Env, Input) ->
                   R = [{sct_version, ?PROTOCOL_VERSION},
                        {id, base64:encode(SPT#spt.logid)},
                        {timestamp, SPT#spt.timestamp},
-                       {extensions, []},
+                       {extensions, base64:encode("")},
                        {signature,
                         base64:encode(
                           list_to_binary(plop:serialise(SPT#spt.signature)))}],