anchor.diff:  
     go-multihash = buildFromGitHub {
       version = 3;
  -    rev = "a52a6a4768da72eba89ea7f59f70e9d42ddd3072";
  +    rev = "f1ef5a02f28c862ca5a2037907cf76cc6c98dbf9";
       owner  = "multiformats";
       repo   = "go-multihash";
  -    sha256 = "1lk0d477mlifir0rg15vlyg6vz0fc5w9lxlnapjy5h56vq2flhbn";
  +    sha256 = "1chv3lkl59dbk18rccq25932fkifg4iirjxf6fqn218pws3p9vab";
       goPackageAliases = [ "github.com/jbenet/go-multihash" ];
       propagatedBuildInputs = [
         crypto
  
positive.code:   };
  
    go-libp2p-interface-conn = buildFromGitHub {
      version = 2;
      owner = "libp2p";
      repo = "go-libp2p-interface-conn";
      date = "2017-03-24";
      rev = "95afdbf0c900237f3b9104f1f7cfd3d56175a241";
      sha256 = "0yxq323kzh2skn1z416g4zb7hmlk5vm9p9l91b8qd99sv7d9jcb9";
      propagatedBuildInputs = [
        go-ipfs-util
        go-libp2p-crypto
  
negative.code:       ugorji_go
      ];
      meta.useUnstable = true;
      date = "2017-07-14";
    };
  
    session = buildFromGitHub {
  