A bare minimum, TLSNotary-like tool built from scratch. Optimized for specific requirements.
TruthTLS is a minimal, pure-Java TLS 1.3 client built from scratch. It provides a clean interface to be integrated with MPC utilities.
I use OpenSSL / tcpdump / Wireshark to calibrate my implementation.
Anything hacky? A TLS client which is built in 1 day itself might be hacky.