Launching Google mirrors for CT logs

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Launching Google mirrors for CT logs Pavel Kalinnikov 10/09/19 03:22 ص

Hi everyone,


On behalf of the Certificate Transparency team at Google I would like to announce that we are launching mirrors of all CT logs recognized by Chrome (including some rejected/read-only ones):



We do so with the purpose of making the CT ecosystem more robust.


The existing mirrors for shut-down Symantec logs remain running at:



The mirrors expose the following read-only endpoints specified in RFC 6962:


  • ct/v1/get-sth

  • ct/v1/get-sth-consistency

  • ct/v1/get-proof-by-hash

  • ct/v1/get-entries

  • ct/v1/get-entry-and-proof


For example, one can get an STH as follows:


$ wget https://ct.googleapis.com/logs/us1/mirrors/cloudflare_nimbus2019/ct/v1/get-sth


WARNING: We do not commit to keeping the mirrors available with any particular SLOs.

We might also change their address or shut them down. If we do so, we will send a notice to this mailing list in advance.


If you believe we missed a log, please let us know.


Thank you,

Pavel