If you run nix develop and it looks like this:
$ nix develop
warning: Git tree '/Users/shane/Projects/elodin' has uncommitted changes
warning: ignoring untrusted substituter 'https://s3-us-west-2.amazonaws.com/elodin-nix-cache', you are not a trusted user.
...Edit the following files to look like this:
$ cat /etc/nix/nix.custom.conf
trusted-users = root YOUR-USER-NAME-HERE
extra-trusted-substituters = https://s3-us-west-2.amazonaws.com/elodin-nix-cache
extra-trusted-public-keys = elodin-cache-1:vvbmIQvTOjcBjIs8Ri7xlT2I3XAmeJyF5mNlWB+fIwM=Once those edits are made, restart the nix daemon.
sudo launchctl kickstart -k system/systems.determinate.nix-daemonsudo systemctl restart nix-daemon