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Most of the time, ByteStrings will be able to be encoded as utf8, so avoid
base64 when not needed.
Adjusted some of the types in order to generate more usual JSON. In particular,
removed StartActivity.
The JSON now looks like this (with the signature still not populated):
{"signature":{"v":""},"prevActivity":{"hashValue":{"v":"3b1abe614dd43bdb2d9a56777884e2d0f3bac9796e2d25c1ad52bb689c117286"},"hashMethod":"SHA256"},"activity":{"echoData":{"v":""},"enteredData":{"v":"l"}}}
203 bytes to send a single keystroke is not great when there's really
only 1+64(hash) bytes of unique data. So, may end up adding a wire
encoding on top of this. But, JSON is good to have for storage of the
proofs, etc.
Also, it does compress well. Two such JSON objects gzip -9 to 219
bytes, and three to 265 bytes. So, 37 bytes per keystroke. This is
*exactly* as efficient as gzip -9 of $c$hash formatted data.
This commit was sponsored by Jack Hill on Patreon.
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