anchor.diff:          # [ "--peer" "35.233.17.169:5001" ] # arnaud
           # [ "--cardano-verification-key" "/credentials/arnaud.cardano.vk" ]
           # [ "--hydra-verification-key" "/credentials/arnaud.hydra.vk" ]
  -        [ "--peer" "13.39.80.222:5001" ] # pascal
  -        [ "--cardano-verification-key" "/credentials/pascal.cardano.vk" ]
  -        [ "--hydra-verification-key" "/credentials/pascal.hydra.vk" ]
  +        # [ "--peer" "13.39.80.222:5001" ] # pascal
  +        # [ "--cardano-verification-key" "/credentials/pascal.cardano.vk" ]
  +        # [ "--hydra-verification-key" "/credentials/pascal.hydra.vk" ]
           [ "--peer" "13.38.49.252:5001" ] # sasha
           [ "--cardano-verification-key" "/credentials/sasha.cardano.vk" ]
           [ "--hydra-verification-key" "/credentials/sasha.hydra.vk" ]
  
positive.code:       nodeId = "sebastian's node";
      in
      {
        image = "ghcr.io/input-output-hk/hydra-node:unstable";
        volumes = [
          "/data/cardano-node:/cardano-node:ro"
          "/data/credentials:/credentials:ro"
  
negative.code: 
    hydraSrc = pkgs.fetchgit {
      url = "https://github.com/input-output-hk/hydra-poc.git";
      rev = "0.8.1";
      sha256 = "1w6vdj5bsr2hhwb9f7fsrc1ykcqplkav5l4q7prx6cpbvpw1mmz1";
    };
    hydra = import (hydraSrc.outPath + "/release.nix") { };
  in
  