https://releases.nixos.org/nixos/16.03/nixos-16.03.1349.dda40aa8d1 1541867466
https://channels.nixos.org/nixos-16.03 1583923235
https://releases.nixos.org/nixos/16.03/nixos-16.03.1349.dda40aa8d1 1583929523
https://channels.nixos.org/nixos-16.03 1584180634
 1594847637
https://channels.nixos.org/nixos-16.03 1594847712