fediversity.eu/npins/sources.json

{
  "pins": {
    "nixpkgs": {
      "type": "Channel",
      "name": "nixpkgs-unstable",
      "url": "https://releases.nixos.org/nixpkgs/nixpkgs-24.11pre691017.b69de56fac8c/nixexprs.tar.xz",
      "hash": "0z32pj0lh5ng2a6cn0qfmka8cynnygckn5615mkaxq2aplkvgzx3"
    }
  },
  "version": 3
}