This release fixes a security weakness, now authentication requires signatures also over the original request in addition to the nonce. (thx mossmann)
And this release introduces a healthcheck operation, which must be initialized by running "sphinx init" or manually creating a record:
echo -n "all ok?" | env/bin/sphinx create healthcheck "sphinx servers" "everything works fine"
the sphinx healthcheck op only runs until the ratelimit challenge is returned by the server, which is a light way to check if all servers are responsive. a full get operation is more heavy (it can ramp up your ratelimit difficulty quickly) but also more complete. (thx endre for the idea)