Now that hydra.iohk.io is down, I see people migrating to cache.iog.io. However I don’t see how to actually use it because I don’t know what the public key for cache.iog.io is, and in fact I’m getting the following warnings.
warning: ignoring substitute for '/nix/store/8bcqcsxm76k2qic240vf063z8rkg0axp-pem-lib-pem-0.2.4' from 'https://cache.iog.io', as it's not signed by any of the keys in 'trusted-public-keys'
warning: ignoring substitute for '/nix/store/nm8h7l8vqm9amlc5rcbg5d6wiv0j7mbc-process-lib-process-1.6.15.0' from 'https://cache.iog.io', as it's not signed by any of the keys in 'trusted-public-keys'
warning: ignoring substitute for '/nix/store/0lq1xfyrqgb8qwmhhih7fzka2zkbhx9d-saltine-lib-saltine-0.2.0.1-config' from 'https://cache.iog.io', as it's not signed by any of the keys in 'trusted-public-keys'
warning: ignoring substitute for '/nix/store/7l9dq9j62pg9a5niccj8v4gqdcg0g6nk-saltine-lib-saltine-0.2.0.1-ghc-8.10.7-env' from 'https://cache.iog.io', as it's not signed by any of the keys in 'trusted-public-keys'
warning: ignoring substitute for '/nix/store/d7d8cg2g8jfq0m0hn8cbh4pklj38dx0i-vector-algorithms-lib-vector-algorithms-0.8.0.4' from 'https://cache.iog.io', as it's not signed by any of the keys in 'trusted-public-keys'
My /etc/nix/nix.conf is as follows:
substituters = https://cache.nixos.org https://cache.iog.io
trusted-public-keys = "hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ=" "cache.iog.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ="