Deleting Oak 2019, 2020, and 2021 shards

This is a cross-post from

On June 27th, 2022 we're going to be deleting the following CT shards. These particular shards have long since stopped accepting new certificate issuances.


  • Oak 2019
  • Oak 2020
  • Oak 2021

If you require any data from these old shards, Google has graciously provided the following read-only log mirrors for production logs (e.g. Oak). Users are welcome to continue retrieving shard data from these mirrors. Please keep in mind that Google has not published any SLA or guarantee about the lifecycle of these mirrors.