It's not client-side only; it requires a server component of which a possible / proof-of-concept implementation can be found here: https://github.com/tls-n/nss-

It's not client-side only; it requires a server component of which a possible / proof-of-concept implementation can be found here: https://github.com/tls-n/nss-tlsn https://github.com/tls-n/nss-tlsn It's a modification to NSS, which isn't widely used for TLS at the server side, where OpenSSL dominates.