@Override
    public Certificate[] getLocalCertificates() {
        // Local certificates never change, so set them locally as soon as they're available
        if (localCertificates == null) {
            synchronized (ssl) {
                localCertificates = ssl.getLocalCertificates();
            }
        }
        return localCertificates == null ? null : localCertificates.clone();
    }
Returns the signed certificate timestamp (SCT) received from the peer. Returns a
copy of the internal array.

@see <a href="https://tools.ietf.org/html/rfc6962">RFC 6962</a>
common/src/main/java/org/conscrypt/ActiveSession.java