anchor.diff:        nodeId = "sebastian's node";
       in
       {
  -      image = "ghcr.io/input-output-hk/hydra-node:unstable";
  +      image = "ghcr.io/input-output-hk/hydra-node:0.8.1";
         volumes = [
           "/data/cardano-node:/cardano-node:ro"
           "/data/credentials:/credentials:ro"
  
positive.code:         # [ "--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" "13.38.49.252:5001" ] # sasha
          [ "--cardano-verification-key" "/credentials/sasha.cardano.vk" ]
          [ "--hydra-verification-key" "/credentials/sasha.hydra.vk" ]
  
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
  