lix/src/libstore/settings/substituters.md

name, internalName, type, default, aliases

name	internalName	type	default	aliases
substituters	substituters	Strings	https://cache.nixos.org/	binary-caches

A list of URLs of Nix stores to be used as substituters, separated by whitespace. A substituter is an additional store from which Lix can obtain store objects instead of building them.

Substituters are tried based on their priority value, which each substituter can set independently. Lower value means higher priority. The default is https://cache.nixos.org, which has a priority of 40.

At least one of the following conditions must be met for Lix to use a substituter:

• The substituter is in the trusted-substituters list
• The user calling Lix is in the trusted-users list

In addition, each store path should be trusted as described in trusted-public-keys