todo

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diff --git a/TODO b/TODO
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+* JSON serialization of signatures uses base64, and
+  does not compress well. gzip -9 of just the base64 signature
+  is 113 bytes, double the 64 byte actual size. Find a more efficient
+  encoding for bytestrings in JSON.
 * Leave the prevMessage out of Activity serialization to save BW.
   Do include it in the data that gets signed, so it can be recovered
   by trying each likely (recently seen) Activity as the prevMessage, and