Join the mutinynet

(add this to your bitcoin.conf file)

[signet]
signetchallenge=512102f7561d208dd9ae99bf497273e16f389bdbd6c4742ddb8e6b216e64fa2928ad8f51ae
addnode=45.79.52.207:38333
dnsseed=0
signetblocktime=30
          

For now you'll need to run a fork of bitcoin core to make it work.