A number of SCTs (basically statements signed by qualifying logs that they saw that certificate at time X) must be delivered to the client during the handshake.

A number of SCTs (basically statements signed by qualifying logs that they saw that certificate at time X) must be delivered to the client during the handshake. Those can be embedded in the certs (by using pre-certificates), included in the TLS message directly or as part of a stapled OCSP response.