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-**Title:** Add checkpoint support </br>
-**Date:** 2021-12-09 </br>
-
-# Summary
-Add experimental checkpoint support.
-
-# Description
-Sigsum collaborated on a common
- [checkpoint format](https://github.com/google/trillian-examples/tree/master/formats/log)
-a while back. A checkpoint is basically a cosigned tree head.
-
-The current decision is to add experimental support for checkpoints. There is
-no formal decision to adopt the above checkpoint yet, hence _experimental_.
-
-To keep it simple:
-1. Don't add any timestamp extension.
-2. Only serve the most recent tree head as a checkpoint. This allows us to
-experiment with external feeders and distributors that are not part of the log.