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A side question: is Key Transparency ready to an extent that a class project can launch a server and create a local key Merkle tree?

CLAs look good, thanks!

Codecov Report

Merging #971 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #971   +/-   ##
=======================================
  Coverage   47.34%   47.34%           
=======================================
  Files          28       28           
  Lines        2034     2034           
=======================================
  Hits          963      963           
  Misses        894      894           
  Partials      177      177

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Hi @weikengchen, thanks for spotting and fixing this!

Key Transparency is ready for prototyping and classroom use.
Key Transparency is in the middle of polishing and tuning so it can be used in production.