diff --git a/pkgs/applications/audio/picard/default.nix b/pkgs/applications/audio/picard/default.nix
index dc06134c910f..c080d0a95f3b 100644
--- a/pkgs/applications/audio/picard/default.nix
+++ b/pkgs/applications/audio/picard/default.nix
@@ -18,7 +18,7 @@ in pythonPackages.buildPythonApplication rec {
     owner = "metabrainz";
     repo = pname;
     rev = "release-${version}";
-    sha256 = "sha256-rJbpoPjNMlw4diWjwNQ/DPo3rltvISU4kuRqBbvlBZ0=";
+    sha256 = "1785wnxhasp4j8w2a8bgbfp3gyhc7zac18r5fqw5qcndz2hfk5mc";
   };
 
   nativeBuildInputs = [ gettext qt5.wrapQtAppsHook qt5.qtbase ]
diff --git a/pkgs/applications/graphics/azpainter/default.nix b/pkgs/applications/graphics/azpainter/default.nix
index 67f1f47dccd0..c2e7ce6f35d3 100644
--- a/pkgs/applications/graphics/azpainter/default.nix
+++ b/pkgs/applications/graphics/azpainter/default.nix
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
     owner = "Symbian9";
     repo = pname;
     rev = "v${version}";
-    sha256 = "sha256-al87Rnf4HkKdmtN3EqxC0zEHgVWwnVi7WttqT/Qxr0Q=";
+    sha256 = "0i5g67s4ysnvbaxmi7dhan0hfcfk8an14xykkafl47pqfx33npva";
   };
 
   buildInputs = [
diff --git a/pkgs/applications/graphics/imv/default.nix b/pkgs/applications/graphics/imv/default.nix
index dd03c2c0bb26..276c2cd3d7ea 100644
--- a/pkgs/applications/graphics/imv/default.nix
+++ b/pkgs/applications/graphics/imv/default.nix
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
     owner  = "eXeC64";
     repo   = "imv";
     rev    = "v${version}";
-    sha256 = "sha256:0gk8g178i961nn3bls75a8qpv6wvfvav6hd9lxca1skaikd33zdx";
+    sha256 = "0gk8g178i961nn3bls75a8qpv6wvfvav6hd9lxca1skaikd33zdx";
   };
 
   preBuild = ''
diff --git a/pkgs/applications/misc/mapproxy/default.nix b/pkgs/applications/misc/mapproxy/default.nix
index 0261dfbe8991..5676aef23607 100644
--- a/pkgs/applications/misc/mapproxy/default.nix
+++ b/pkgs/applications/misc/mapproxy/default.nix
@@ -11,7 +11,7 @@ let
         owner = "pyproj4";
         repo = "pyproj";
         rev = "v${version}rel";
-        sha256 = "sha256:18v4h7jx4mcc0x2xy8y7dfjq9bzsyxs8hdb6v67cabvlz2njziqy";
+        sha256 = "18v4h7jx4mcc0x2xy8y7dfjq9bzsyxs8hdb6v67cabvlz2njziqy";
       };
       nativeBuildInputs = with python.pkgs; [ cython ];
       patches = [ ];
diff --git a/pkgs/applications/misc/xastir/default.nix b/pkgs/applications/misc/xastir/default.nix
index e5dc92c4ad62..84e4eee2bddc 100644
--- a/pkgs/applications/misc/xastir/default.nix
+++ b/pkgs/applications/misc/xastir/default.nix
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
     owner = pname;
     repo = pname;
     rev = "Release-${version}";
-    sha256 = "sha256-IdlRScAy7tCyVCElCceY4PvqPXWfZZ35f+MwCo3nO3s=";
+    sha256 = "0yrvwy6hlc73gzwrsrczflyymyz0k33hj991ajrd1vijq14m3n91";
   };
 
   buildInputs = [
diff --git a/pkgs/applications/networking/Sylk/default.nix b/pkgs/applications/networking/Sylk/default.nix
index 425f4fcf2ff4..f6a88f26e9a2 100644
--- a/pkgs/applications/networking/Sylk/default.nix
+++ b/pkgs/applications/networking/Sylk/default.nix
@@ -10,7 +10,7 @@ appimageTools.wrapType2 rec {
 
   src = fetchurl {
     url = "http://download.ag-projects.com/Sylk/Sylk-${version}-x86_64.AppImage";
-    hash = "sha256:1hz41jan8hw56ahpaajlb1yy5zjkyxrclzmqhklm5x59b76pd0zx";
+    sha256 = "1hz41jan8hw56ahpaajlb1yy5zjkyxrclzmqhklm5x59b76pd0zx";
   };
 
   profile = ''
diff --git a/pkgs/applications/networking/cawbird/default.nix b/pkgs/applications/networking/cawbird/default.nix
index 6b8ce360063f..2ff9e5581b0a 100644
--- a/pkgs/applications/networking/cawbird/default.nix
+++ b/pkgs/applications/networking/cawbird/default.nix
@@ -27,7 +27,7 @@ stdenv.mkDerivation rec {
     owner = "IBBoard";
     repo = "cawbird";
     rev = "v${version}";
-    sha256 = "sha256:0zghryx5y47ff8kxa65lvgmy1cnhvhazxml7r1lxixxj3d88wh7p";
+    sha256 = "0zghryx5y47ff8kxa65lvgmy1cnhvhazxml7r1lxixxj3d88wh7p";
   };
 
   nativeBuildInputs = [
diff --git a/pkgs/applications/networking/cluster/terraform-providers/vpsadmin/default.nix b/pkgs/applications/networking/cluster/terraform-providers/vpsadmin/default.nix
index 270c7adcb47f..2832580287b1 100644
--- a/pkgs/applications/networking/cluster/terraform-providers/vpsadmin/default.nix
+++ b/pkgs/applications/networking/cluster/terraform-providers/vpsadmin/default.nix
@@ -7,7 +7,7 @@ buildGoModule rec {
     owner = "vpsfreecz";
     repo = "terraform-provider-vpsadmin";
     rev = "v${version}";
-    hash = "sha256-+6jRjcManQdoKh7ewOJI1UaulY5OSbkIUHmtrBI33u4=";
+    sha256 = "1vny6w9arbbra04bjjafisaswinm93ic1phy59l0g78sqf6x3a7v";
   };
 
   vendorSha256 = "0j90fnzba23mwf9bzf9w5h0hszkl3h61p5i780s9v9c0hbzhbqsh";
@@ -24,4 +24,4 @@ buildGoModule rec {
     license = licenses.mpl20;
     maintainers = with maintainers; [ zimbatm ];
   };
-}
\ No newline at end of file
+}
diff --git a/pkgs/applications/networking/instant-messengers/deltachat-electron/default.nix b/pkgs/applications/networking/instant-messengers/deltachat-electron/default.nix
index cfc5f090cd4c..e58e73fdc85b 100644
--- a/pkgs/applications/networking/instant-messengers/deltachat-electron/default.nix
+++ b/pkgs/applications/networking/instant-messengers/deltachat-electron/default.nix
@@ -8,7 +8,7 @@ let
   src = fetchurl {
     url =
       "https://download.delta.chat/desktop/v${version}/DeltaChat-${version}.AppImage";
-    sha256 = "sha256-Mk4OzKcZceRv2IEzf/72VBWEq2RWi6BVzqjfEB5D1/c=";
+    sha256 = "1xyp8cg11px8rras12sncjmq85alyvz7ycw1v1py8w8rlz60wkij";
   };
 
   appimageContents = appimageTools.extract { inherit name src; };
diff --git a/pkgs/applications/networking/instant-messengers/quaternion/default.nix b/pkgs/applications/networking/instant-messengers/quaternion/default.nix
index 18b590304d8d..b1577a37844d 100644
--- a/pkgs/applications/networking/instant-messengers/quaternion/default.nix
+++ b/pkgs/applications/networking/instant-messengers/quaternion/default.nix
@@ -11,7 +11,7 @@ mkDerivation rec {
     owner = "QMatrixClient";
     repo = "Quaternion";
     rev = "${version}";
-    sha256 = "sha256-2yEiILiitRPj2hCodUDM8UNVq8crb9nyX21ebuh5EEM=";
+    sha256 = "0hqhg7l6wpkdbzrdjvrbqymmahziri07ba0hvbii7dd2p0h248fv";
   };
 
   buildInputs = [
diff --git a/pkgs/applications/networking/newsreaders/liferea/default.nix b/pkgs/applications/networking/newsreaders/liferea/default.nix
index f1e8905089c9..816e00447a00 100644
--- a/pkgs/applications/networking/newsreaders/liferea/default.nix
+++ b/pkgs/applications/networking/newsreaders/liferea/default.nix
@@ -10,7 +10,7 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     url = "https://github.com/lwindolf/${pname}/releases/download/v${version}/${pname}-${version}b.tar.bz2";
-    sha256 = "sha256:03pr1gmiv5y0i92bkhcxr8s311ll91chz19wb96jkixx32xav91d";
+    sha256 = "03pr1gmiv5y0i92bkhcxr8s311ll91chz19wb96jkixx32xav91d";
   };
 
   nativeBuildInputs = [ wrapGAppsHook python3Packages.wrapPython intltool pkgconfig ];
diff --git a/pkgs/applications/office/scribus/unstable.nix b/pkgs/applications/office/scribus/unstable.nix
index aa0c2dee9790..ebfaa231fbac 100644
--- a/pkgs/applications/office/scribus/unstable.nix
+++ b/pkgs/applications/office/scribus/unstable.nix
@@ -70,13 +70,13 @@ mkDerivation rec {
     })
     (fetchpatch {
       url = "https://github.com/scribusproject/scribus/commit/24aba508aac3f672f5f8cd629744a3b71e58ec37.patch";
-      sha256 = "sha256-OY+EIiGBTg2aIAmZOnkI8DPZVZYqFZAKnD7ychge1Dw=";
+      sha256 = "0g6l3qc75wiykh59059ajraxjczh11wkm68942d0skl144i893rr";
       includes = [ "scribus/plugins/import/pdf/*" ];
     })
     # fix build with Poppler 0.86
     (fetchpatch {
       url = "https://github.com/scribusproject/scribus/commit/67f8771aaff2f55d61b8246f420e762f4b526944.patch";
-      sha256 = "51z+BYKhbH8a9dFph8X60NGpiogSb+5tOhW2d+m/X9M=";
+      sha256 = "1lszpzlpgdhm79nywvqji25aklfhzb2qfsfiyld7yv51h82zwp77";
     })
   ];
 
diff --git a/pkgs/applications/science/logic/cadical/default.nix b/pkgs/applications/science/logic/cadical/default.nix
index 5e6c0d55b7dd..6a90f50b5aa3 100644
--- a/pkgs/applications/science/logic/cadical/default.nix
+++ b/pkgs/applications/science/logic/cadical/default.nix
@@ -8,7 +8,7 @@ stdenv.mkDerivation rec {
     owner = "arminbiere";
     repo = "cadical";
     rev = "rel-${version}";
-    hash = "sha256:1a66xkw42ad330fvw8i0sawrmg913m8wrq5c85lw5qandkwvxdi6";
+    sha256 = "1a66xkw42ad330fvw8i0sawrmg913m8wrq5c85lw5qandkwvxdi6";
   };
 
   dontAddPrefix = true;
diff --git a/pkgs/applications/version-management/git-and-tools/gitbatch/default.nix b/pkgs/applications/version-management/git-and-tools/gitbatch/default.nix
index 2b372cc0e213..99a127f3d8f8 100644
--- a/pkgs/applications/version-management/git-and-tools/gitbatch/default.nix
+++ b/pkgs/applications/version-management/git-and-tools/gitbatch/default.nix
@@ -12,7 +12,7 @@ buildGoPackage rec {
     owner = "isacikgoz";
     repo = "gitbatch";
     rev = "381b0df7f86056c625c0d4d2d979733c1ee5def7";
-    sha256 = "sha256:0613vfqdn3k0w7fm25rqnqdr67w9vii3i56dfslqcn1vqjfrff3q";
+    sha256 = "0613vfqdn3k0w7fm25rqnqdr67w9vii3i56dfslqcn1vqjfrff3q";
   };
 
   meta = with stdenv.lib; {
diff --git a/pkgs/applications/video/catt/default.nix b/pkgs/applications/video/catt/default.nix
index b3df290bfb09..7f2b85511518 100644
--- a/pkgs/applications/video/catt/default.nix
+++ b/pkgs/applications/video/catt/default.nix
@@ -12,7 +12,7 @@ buildPythonApplication rec {
 
   src = fetchPypi {
     inherit pname version;
-    hash = "sha256:1vq1wg79b7855za6v6bsfgypm0v3b4wakap4rash45mhzbgjj0kq";
+    sha256 = "1vq1wg79b7855za6v6bsfgypm0v3b4wakap4rash45mhzbgjj0kq";
   };
 
   propagatedBuildInputs = [
diff --git a/pkgs/applications/window-managers/wmfs/default.nix b/pkgs/applications/window-managers/wmfs/default.nix
index 2013096d6fea..a53fc560abca 100644
--- a/pkgs/applications/window-managers/wmfs/default.nix
+++ b/pkgs/applications/window-managers/wmfs/default.nix
@@ -8,7 +8,7 @@ stdenv.mkDerivation {
   src = fetchFromGitHub {
     owner = "xorg62";
     repo = "wmfs";
-    sha256 = "sha256:1m7dsmmlhq2qipim659cp9aqlriz1cwrrgspl8baa5pncln0gd5c";
+    sha256 = "1m7dsmmlhq2qipim659cp9aqlriz1cwrrgspl8baa5pncln0gd5c";
     rev = "b7b8ff812d28c79cb22a73db2739989996fdc6c2";
   };
 
diff --git a/pkgs/data/fonts/line-awesome/default.nix b/pkgs/data/fonts/line-awesome/default.nix
index f100f81b3d79..d9f7818dd2f7 100644
--- a/pkgs/data/fonts/line-awesome/default.nix
+++ b/pkgs/data/fonts/line-awesome/default.nix
@@ -7,7 +7,7 @@ stdenv.mkDerivation rec {
   src = fetchurl {
     url =
       "https://maxst.icons8.com/vue-static/landings/line-awesome/line-awesome/${version}/line-awesome-${version}.zip";
-    hash = "sha256:07qkz8s1wjh5xwqlq1b4lpihr1zah3kh6bnqvfwvncld8l9wjqfk";
+    sha256 = "07qkz8s1wjh5xwqlq1b4lpihr1zah3kh6bnqvfwvncld8l9wjqfk";
   };
 
   nativeBuildInputs = [ unzip ];
diff --git a/pkgs/data/fonts/rictydiminished-with-firacode/default.nix b/pkgs/data/fonts/rictydiminished-with-firacode/default.nix
index ccfc72dc1809..0f90c13d11eb 100644
--- a/pkgs/data/fonts/rictydiminished-with-firacode/default.nix
+++ b/pkgs/data/fonts/rictydiminished-with-firacode/default.nix
@@ -7,7 +7,7 @@ stdenv.mkDerivation rec {
   src = fetchgit {
     url = "https://github.com/hakatashi/RictyDiminished-with-FiraCode.git";
     rev = version;
-    sha256 = "sha256-twh3yLAM4MUjWzSDNmo8gNIRf01hieXeOS334sNdFk4=";
+    sha256 = "0khnbp1y5xrd77gfb2b19mzi3ll07im3d0rlbciwbq0cn347f25p";
     fetchSubmodules = true;
   };
 
diff --git a/pkgs/data/fonts/twitter-color-emoji/default.nix b/pkgs/data/fonts/twitter-color-emoji/default.nix
index 0e835cbedea1..ac3930853cf9 100644
--- a/pkgs/data/fonts/twitter-color-emoji/default.nix
+++ b/pkgs/data/fonts/twitter-color-emoji/default.nix
@@ -22,7 +22,7 @@ let
     owner = "twitter";
     repo = "twemoji";
     rev = "v${version}";
-    hash = "sha256-qb3bLiUgtA8QQ13u928kvM+3qwmQpyjUk0EPKja1kSk=";
+    sha256 = "0acinlv2l3s1jga2i9wh16mvgkxw4ipzgvjx8c80zd104lpdpgd9";
   };
 
 in
@@ -57,7 +57,7 @@ stdenv.mkDerivation rec {
     # ImageMagick -> GraphicsMagick
     (fetchpatch {
       url = "https://src.fedoraproject.org/rpms/twitter-twemoji-fonts/raw/07778605d50696f6aa929020e82611a01d254c90/f/noto-emoji-use-gm.patch";
-      sha256 = "sha256-kyJwT1SKS1vnXxvPTiIMK6TRHMp1ZOSlb6rodL4Jbxs=";
+      sha256 = "06vg16z79s5adyjy8r3mr8fd391b1hi4xkqvbzkmnjwaai7p08lk";
     })
   ];
 
diff --git a/pkgs/desktops/gnome-3/core/gnome-dictionary/default.nix b/pkgs/desktops/gnome-3/core/gnome-dictionary/default.nix
index a19f0b6a276e..02941743f556 100644
--- a/pkgs/desktops/gnome-3/core/gnome-dictionary/default.nix
+++ b/pkgs/desktops/gnome-3/core/gnome-dictionary/default.nix
@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
     # fix AppStream validation
     (fetchpatch {
       url = "https://gitlab.gnome.org/GNOME/gnome-dictionary/commit/1c94d612030ef87c6e26a01a490470b71c39e341.patch";
-      sha256 = "sha256:0cbswmhs9mks3gsc0iy4wnidsa8sfzzf4s1kgvb80qwffgxz5m8b";
+      sha256 = "0cbswmhs9mks3gsc0iy4wnidsa8sfzzf4s1kgvb80qwffgxz5m8b";
     })
   ];
 
diff --git a/pkgs/development/haskell-modules/configuration-common.nix b/pkgs/development/haskell-modules/configuration-common.nix
index fac090010873..187b6f8a8a46 100644
--- a/pkgs/development/haskell-modules/configuration-common.nix
+++ b/pkgs/development/haskell-modules/configuration-common.nix
@@ -1473,7 +1473,7 @@ self: super: {
   # release of webify is published.
   webify = appendPatch super.webify (pkgs.fetchpatch {
     url = "https://github.com/ananthakumaran/webify/pull/27/commits/6d653e7bdc1ffda75ead46851b5db45e87cb2aa0.patch";
-    sha256 = "sha256:0xbfhzhzg94b4r5qy5dg1c40liswwpqarrc2chcwgfbfnrmwkfc2";
+    sha256 = "0xbfhzhzg94b4r5qy5dg1c40liswwpqarrc2chcwgfbfnrmwkfc2";
   });
 
   # Depends on selective >= 0.4, but the default of selective is 0.3
diff --git a/pkgs/development/idris-modules/sdl2.nix b/pkgs/development/idris-modules/sdl2.nix
index 606b5a38a5f0..2e1cdaa9be3a 100644
--- a/pkgs/development/idris-modules/sdl2.nix
+++ b/pkgs/development/idris-modules/sdl2.nix
@@ -24,7 +24,7 @@ build-idris-package rec {
     owner = "steshaw";
     repo = "idris-sdl2";
     rev = version;
-    sha256 = "sha256:1jslnlzyw04dcvcd7xsdjqa7waxzkm5znddv76sv291jc94xhl4a";
+    sha256 = "0hqhg7l6wpkdbzrdjvrbqymmahziri07ba0hvbii7dd2p0h248fv";
   };
 
   meta = {
diff --git a/pkgs/development/libraries/civetweb/default.nix b/pkgs/development/libraries/civetweb/default.nix
index 35f8f5e663ad..4092a9c9c5b8 100644
--- a/pkgs/development/libraries/civetweb/default.nix
+++ b/pkgs/development/libraries/civetweb/default.nix
@@ -10,7 +10,7 @@ stdenv.mkDerivation rec {
     owner = pname;
     repo = pname;
     rev = "v${version}";
-    sha256 = "sha256:1drnid6gs97cp9zpvsxz42yfj8djmgx98fg9p2993x9mpi547vzv";
+    sha256 = "1drnid6gs97cp9zpvsxz42yfj8djmgx98fg9p2993x9mpi547vzv";
   };
 
   makeFlags = [
diff --git a/pkgs/development/libraries/multipart-parser-c/default.nix b/pkgs/development/libraries/multipart-parser-c/default.nix
index e641b404a867..b2bdf5d04476 100644
--- a/pkgs/development/libraries/multipart-parser-c/default.nix
+++ b/pkgs/development/libraries/multipart-parser-c/default.nix
@@ -10,7 +10,7 @@ stdenv.mkDerivation rec {
     owner = "iafonov";
     repo = pname;
     rev = "772639cf10db6d9f5a655ee9b7eb20b815fab396";
-    sha256 = "sha256:056r63vj8f1rwf3wk7jmwhm8ba25l6h1gs6jnkh0schbwcvi56xl";
+    sha256 = "056r63vj8f1rwf3wk7jmwhm8ba25l6h1gs6jnkh0schbwcvi56xl";
   };
 
   buildPhase = ''
diff --git a/pkgs/development/libraries/speechd/default.nix b/pkgs/development/libraries/speechd/default.nix
index 6b8e42a7c195..eab6c1d446cd 100644
--- a/pkgs/development/libraries/speechd/default.nix
+++ b/pkgs/development/libraries/speechd/default.nix
@@ -43,7 +43,7 @@ in stdenv.mkDerivation rec {
 
   src = fetchurl {
     url = "https://github.com/brailcom/speechd/releases/download/${version}/${pname}-${version}.tar.gz";
-    hash = "sha256:16bg52hnkrsrs7kgbzanb34b9zb6fqxwj0a9bmsxmj1skkil1h1p";
+    sha256 = "16bg52hnkrsrs7kgbzanb34b9zb6fqxwj0a9bmsxmj1skkil1h1p";
   };
 
   patches = [
diff --git a/pkgs/development/libraries/ticpp/default.nix b/pkgs/development/libraries/ticpp/default.nix
index 01fab29b6743..37b093c8e2ec 100644
--- a/pkgs/development/libraries/ticpp/default.nix
+++ b/pkgs/development/libraries/ticpp/default.nix
@@ -11,7 +11,7 @@ stdenv.mkDerivation {
     owner = "wxFormBuilder";
     repo = "ticpp";
     rev = "eb79120ea16b847ce9f483a298a394050f463d6b";
-    sha256 = "sha256:0xk4cy0xbkr6326cqd1vd6b2x0rfsx4iz2sq8f5jz3yl3slxgjm2";
+    sha256 = "0xk4cy0xbkr6326cqd1vd6b2x0rfsx4iz2sq8f5jz3yl3slxgjm2";
   };
 
   nativeBuildInputs = [ cmake ];
diff --git a/pkgs/development/python-modules/cryptography/vectors.nix b/pkgs/development/python-modules/cryptography/vectors.nix
index d98945b433e9..096eab77bec3 100644
--- a/pkgs/development/python-modules/cryptography/vectors.nix
+++ b/pkgs/development/python-modules/cryptography/vectors.nix
@@ -7,7 +7,7 @@ buildPythonPackage rec {
 
   src = fetchPypi {
     inherit pname version;
-    hash = "sha256:1d4iykcv7cn9j399hczlxm5pzxmqy6d80h3j16dkjwlmv3293b4r";
+    sha256 = "1d4iykcv7cn9j399hczlxm5pzxmqy6d80h3j16dkjwlmv3293b4r";
   };
 
   # No tests included
diff --git a/pkgs/development/python-modules/django-simple-captcha/default.nix b/pkgs/development/python-modules/django-simple-captcha/default.nix
index 67977caf9ec3..51c5b26bdf27 100644
--- a/pkgs/development/python-modules/django-simple-captcha/default.nix
+++ b/pkgs/development/python-modules/django-simple-captcha/default.nix
@@ -17,7 +17,7 @@ buildPythonPackage rec {
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "sha256:1g92sdgcb81r3il34pg0z210cz6wm14k00b558nshai8br1g09gw";
+    sha256 = "1g92sdgcb81r3il34pg0z210cz6wm14k00b558nshai8br1g09gw";
     extension = "zip";
   };
 
diff --git a/pkgs/development/python-modules/flit-core/default.nix b/pkgs/development/python-modules/flit-core/default.nix
index f6afce0b9f28..441084da97fa 100644
--- a/pkgs/development/python-modules/flit-core/default.nix
+++ b/pkgs/development/python-modules/flit-core/default.nix
@@ -16,7 +16,7 @@ buildPythonPackage rec {
   src = fetchPypi {
     inherit version;
     pname = "flit_core";
-    hash = "sha256:a50bcd8bf5785e3a7d95434244f30ba693e794c5204ac1ee908fc07c4acdbf80";
+    sha256 = "a50bcd8bf5785e3a7d95434244f30ba693e794c5204ac1ee908fc07c4acdbf80";
   };
 
   propagatedBuildInputs = [
@@ -33,4 +33,4 @@ buildPythonPackage rec {
     license = lib.licenses.bsd3;
     maintainers = [ lib.maintainers.fridh ];
   };
-}
\ No newline at end of file
+}
diff --git a/pkgs/development/python-modules/fritzconnection/default.nix b/pkgs/development/python-modules/fritzconnection/default.nix
index d8f1a52d465a..d55941bd5b47 100644
--- a/pkgs/development/python-modules/fritzconnection/default.nix
+++ b/pkgs/development/python-modules/fritzconnection/default.nix
@@ -8,7 +8,7 @@ buildPythonPackage rec {
     owner = "kbr";
     repo = pname;
     rev = version;
-    hash = "sha256:17z4shs56ci9mxmilppv5xy9gbnbp6p1h2ms6x55nkvwndacrp7x";
+    sha256 = "17z4shs56ci9mxmilppv5xy9gbnbp6p1h2ms6x55nkvwndacrp7x";
   };
 
   disabled = pythonOlder "3.5";
diff --git a/pkgs/development/python-modules/hypothesis/2.nix b/pkgs/development/python-modules/hypothesis/2.nix
index 9b4aa5ccf0ab..5b086d5f1a7f 100644
--- a/pkgs/development/python-modules/hypothesis/2.nix
+++ b/pkgs/development/python-modules/hypothesis/2.nix
@@ -18,7 +18,7 @@ buildPythonPackage rec {
     owner = "HypothesisWorks";
     repo = "hypothesis-python";
     rev = "hypothesis-python-${version}";
-    hash = "sha256:1qcpcrk6892hzyjsdr581pw6i4fj9035nv89mcjrcrzcmycdlfds";
+    sha256 = "1qcpcrk6892hzyjsdr581pw6i4fj9035nv89mcjrcrzcmycdlfds";
   };
 
   postUnpack = "sourceRoot=$sourceRoot/hypothesis-python";
@@ -42,4 +42,4 @@ buildPythonPackage rec {
     homepage = "https://github.com/HypothesisWorks/hypothesis";
     license = licenses.mpl20;
   };
-}
\ No newline at end of file
+}
diff --git a/pkgs/development/python-modules/hypothesis/default.nix b/pkgs/development/python-modules/hypothesis/default.nix
index 1a30aade82cd..f79fe028203e 100644
--- a/pkgs/development/python-modules/hypothesis/default.nix
+++ b/pkgs/development/python-modules/hypothesis/default.nix
@@ -18,7 +18,7 @@ buildPythonPackage rec {
     owner = "HypothesisWorks";
     repo = "hypothesis-python";
     rev = "hypothesis-python-${version}";
-    hash = "sha256:1ca2dwih65s4r8vazwqm963ywngdr3v854ldnfyny7bvx1v28m8k";
+    sha256 = "1ca2dwih65s4r8vazwqm963ywngdr3v854ldnfyny7bvx1v28m8k";
   };
 
   postUnpack = "sourceRoot=$sourceRoot/hypothesis-python";
diff --git a/pkgs/development/python-modules/mortgage/default.nix b/pkgs/development/python-modules/mortgage/default.nix
index 8861a19811f7..dc395a87a560 100644
--- a/pkgs/development/python-modules/mortgage/default.nix
+++ b/pkgs/development/python-modules/mortgage/default.nix
@@ -11,7 +11,7 @@ buildPythonPackage rec {
 
   src = fetchPypi {
     inherit version pname;
-    hash = "sha256:18fcb356c631e9cc27fa7019f6ff6021707e34b9ce3a3b7dc815661288709921";
+    sha256 = "18fcb356c631e9cc27fa7019f6ff6021707e34b9ce3a3b7dc815661288709921";
   };
 
   checkInputs = [
@@ -27,4 +27,4 @@ buildPythonPackage rec {
     license = lib.licenses.mit;
   };
 
-}
\ No newline at end of file
+}
diff --git a/pkgs/development/python-modules/pip/default.nix b/pkgs/development/python-modules/pip/default.nix
index fa44278d9993..8c2247c24aa6 100644
--- a/pkgs/development/python-modules/pip/default.nix
+++ b/pkgs/development/python-modules/pip/default.nix
@@ -21,7 +21,7 @@ buildPythonPackage rec {
     owner = "pypa";
     repo = pname;
     rev = version;
-    hash = "sha256:0s9z72cpa15p2bp7zq1lid8k2ykrznfzjwpq5f41v3f30faraxg7";
+    sha256 = "0s9z72cpa15p2bp7zq1lid8k2ykrznfzjwpq5f41v3f30faraxg7";
     name = "${pname}-${version}-source";
   };
 
diff --git a/pkgs/development/python-modules/pyGithub/default.nix b/pkgs/development/python-modules/pyGithub/default.nix
index cf0784024f17..c82f18d377d3 100644
--- a/pkgs/development/python-modules/pyGithub/default.nix
+++ b/pkgs/development/python-modules/pyGithub/default.nix
@@ -19,7 +19,7 @@ buildPythonPackage rec {
     owner = "PyGithub";
     repo = "PyGithub";
     rev = "v${version}";
-    hash = "sha256-8uQCFiw1ByPOX8ZRUlSLYPIibjmd19r/JtTnmQdz5cM=";
+    sha256 = "1hz5fc3rkryl4vzxmmwx75p25wk0ida54lf6bz7261rm5hb05r7j";
   };
 
   checkInputs = [ httpretty parameterized pytestCheckHook ];
diff --git a/pkgs/development/python-modules/python-jsonrpc-server/default.nix b/pkgs/development/python-modules/python-jsonrpc-server/default.nix
index 16c53cd7caba..587f27fd51be 100644
--- a/pkgs/development/python-modules/python-jsonrpc-server/default.nix
+++ b/pkgs/development/python-modules/python-jsonrpc-server/default.nix
@@ -11,7 +11,7 @@ buildPythonPackage rec {
     owner = "palantir";
     repo = "python-jsonrpc-server";
     rev = version;
-    sha256 = "sha256:027sx5pv4i9a192kr00bjjcxxprh2xyr8q5372q8ghff3xryk9dd";
+    sha256 = "027sx5pv4i9a192kr00bjjcxxprh2xyr8q5372q8ghff3xryk9dd";
   };
 
   postPatch = ''
diff --git a/pkgs/development/python-modules/requests/default.nix b/pkgs/development/python-modules/requests/default.nix
index a3c0252b6e80..9b443df4be4c 100644
--- a/pkgs/development/python-modules/requests/default.nix
+++ b/pkgs/development/python-modules/requests/default.nix
@@ -8,7 +8,7 @@ buildPythonPackage rec {
 
   src = fetchPypi {
     inherit pname version;
-    hash = "sha256:1rhpg0jb08v0gd7f19jjiwlcdnxpmqi1fhvw7r4s9avddi4kvx5k";
+    sha256 = "1rhpg0jb08v0gd7f19jjiwlcdnxpmqi1fhvw7r4s9avddi4kvx5k";
   };
 
   nativeBuildInputs = [ pytest ];
diff --git a/pkgs/development/python-modules/setuptools/default.nix b/pkgs/development/python-modules/setuptools/default.nix
index ebf871e0efbf..69b89a376fc2 100644
--- a/pkgs/development/python-modules/setuptools/default.nix
+++ b/pkgs/development/python-modules/setuptools/default.nix
@@ -23,7 +23,7 @@ let
       owner = "pypa";
       repo = pname;
       rev = "v${version}";
-      hash = "sha256:1f6bp3qy5zvykimadk8k11k3629hmnwlw2cfw4vwcsvdarhig673";
+      sha256 = "1f6bp3qy5zvykimadk8k11k3629hmnwlw2cfw4vwcsvdarhig673";
       name = "${pname}-${version}-source";
     };
 
diff --git a/pkgs/development/python-modules/sphinx/default.nix b/pkgs/development/python-modules/sphinx/default.nix
index ee3a27809af3..b4cbd3bff9a1 100644
--- a/pkgs/development/python-modules/sphinx/default.nix
+++ b/pkgs/development/python-modules/sphinx/default.nix
@@ -36,7 +36,7 @@ buildPythonPackage rec {
   src = fetchPypi {
     pname = "Sphinx";
     inherit version;
-    hash = "sha256:0wpmqfx4mxv5kv9xxd6wyfsm8vcnp8p99h14q7b6if2mv69gvvb2";
+    sha256 = "0wpmqfx4mxv5kv9xxd6wyfsm8vcnp8p99h14q7b6if2mv69gvvb2";
   };
   LC_ALL = "en_US.UTF-8";
 
diff --git a/pkgs/development/tools/documentation/mdsh/default.nix b/pkgs/development/tools/documentation/mdsh/default.nix
index e5d9143f61c0..3a33925a86f2 100644
--- a/pkgs/development/tools/documentation/mdsh/default.nix
+++ b/pkgs/development/tools/documentation/mdsh/default.nix
@@ -8,10 +8,10 @@ rustPlatform.buildRustPackage rec {
     owner = "zimbatm";
     repo = "mdsh";
     rev = "v${version}";
-    sha256 = "sha256-VF6GZxWZbrJNixE3wItF4CtVpj9NuKjdotNXrYujugs=";
+    sha256 = "02xslf5ssmyklbfsif2d7yk5aaz08n5w0dqiid6v4vlr2mkqcpjl";
   };
 
-  cargoSha256 = "sha256-b8xXaWACDJ143i8UV3DJDjqu8HiXdO4fe6YDR/GcHoU=";
+  cargoSha256 = "118ykkqlf0x6gcgywx4pg3qawfhfr5q5f51gvrw9s302c1lmgk3g";
 
   meta = with stdenv.lib; {
     description = "Markdown shell pre-processor";
diff --git a/pkgs/development/tools/java/visualvm/default.nix b/pkgs/development/tools/java/visualvm/default.nix
index b85ae307ee5a..3f33ff7c13a0 100644
--- a/pkgs/development/tools/java/visualvm/default.nix
+++ b/pkgs/development/tools/java/visualvm/default.nix
@@ -6,7 +6,7 @@ stdenv.mkDerivation rec {
 
   src = fetchzip {
     url = "https://github.com/visualvm/visualvm.src/releases/download/${version}/visualvm_${builtins.replaceStrings ["."] [""]  version}.zip";
-    hash = "sha256-+T8U/GwMA46FHd0p6qpklHXb6+HPCbbIbo6s2Y/77RQ=";
+    sha256 = "057dzf7xkb4fdv4bc2fgw7mxnxclcjmflafx3n2qw0qcdky18gzr";
   };
 
   desktopItem = makeDesktopItem {
diff --git a/pkgs/development/tools/ofono-phonesim/default.nix b/pkgs/development/tools/ofono-phonesim/default.nix
index e62827c67b49..e651c7cfab50 100644
--- a/pkgs/development/tools/ofono-phonesim/default.nix
+++ b/pkgs/development/tools/ofono-phonesim/default.nix
@@ -13,7 +13,7 @@ mkDerivation {
   src = fetchgit {
     url = "git://git.kernel.org/pub/scm/network/ofono/phonesim.git";
     rev = "adf231a84cd3708b825dc82c56e841dd7e3b4541";
-    sha256 = "sha256:1840914sz46l8h2jwa0lymw6dvgj72wq9bhp3k4v4rk6masbf6hp";
+    sha256 = "1840914sz46l8h2jwa0lymw6dvgj72wq9bhp3k4v4rk6masbf6hp";
   };
 
   nativeBuildInputs = [
diff --git a/pkgs/development/tools/poetry2nix/poetry2nix/lib.nix b/pkgs/development/tools/poetry2nix/poetry2nix/lib.nix
index 39233929abb9..4d3d36fd769d 100644
--- a/pkgs/development/tools/poetry2nix/poetry2nix/lib.nix
+++ b/pkgs/development/tools/poetry2nix/poetry2nix/lib.nix
@@ -146,7 +146,7 @@ let
     else
       pkgs.fetchurl {
         url = predictURLFromPypi { inherit pname file hash kind; };
-        inherit hash;
+        sha256 = builtins.elemAt (builtins.match "sha256:(.*)" hash) 0; # nix 2.0 backwards compatibility.
       }
   );
   getBuildSystemPkgs =
diff --git a/pkgs/games/pingus/default.nix b/pkgs/games/pingus/default.nix
index 6ffc38f6700f..81e22b90e97f 100644
--- a/pkgs/games/pingus/default.nix
+++ b/pkgs/games/pingus/default.nix
@@ -9,7 +9,7 @@ stdenv.mkDerivation rec {
   src = fetchgit {
     url = "https://gitlab.com/pingus/pingus/";
     rev = "709546d9b9c4d6d5f45fc9112b45ac10c7f9417d";
-    sha256 = "sha256:11mmzk0766riaw5qyd1r5i7s7vczbbzfccm92bvgrm99iy1sj022";
+    sha256 = "11mmzk0766riaw5qyd1r5i7s7vczbbzfccm92bvgrm99iy1sj022";
     fetchSubmodules = true;
   };
 
diff --git a/pkgs/servers/sql/postgresql/ext/repmgr.nix b/pkgs/servers/sql/postgresql/ext/repmgr.nix
index b0d3b5bead5e..4ac74b2620bc 100644
--- a/pkgs/servers/sql/postgresql/ext/repmgr.nix
+++ b/pkgs/servers/sql/postgresql/ext/repmgr.nix
@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
     owner = "2ndQuadrant";
     repo = "repmgr";
     rev = "v${version}";
-    hash = "sha256-1CshcutjgwWCRxBfjlNGDLKMT5BYqb+sh4i+/E/YN38=";
+    sha256 = "0zrpv17zrgl8hynbzaaqj17qrchc8r9qwpqh8y10b0v3xdr22ayl";
   };
 
   nativeBuildInputs = [ flex ];
diff --git a/pkgs/servers/web-apps/cryptpad/bower-packages.nix b/pkgs/servers/web-apps/cryptpad/bower-packages.nix
index 0321f7458334..76dc26c4e08f 100644
--- a/pkgs/servers/web-apps/cryptpad/bower-packages.nix
+++ b/pkgs/servers/web-apps/cryptpad/bower-packages.nix
@@ -1,7 +1,7 @@
 # Generated by bower2nix v3.2.0 (https://github.com/rvl/bower2nix)
 { fetchbower, buildEnv }:
 buildEnv { name = "bower-env"; ignoreCollisions = true; paths = [
-  (fetchbower "jquery" "2.1.0" "~2.1.0" "sha256-mVqtu4tv66a4WT9mztU5UAKqxm9An2sxCPv+PdLffAo=")
+  (fetchbower "jquery" "2.1.0" "~2.1.0" "02kwvz93vzpv10qnp7s0dz3al0jh77awwrizb6wadsvgifxssnlr")
   (fetchbower "jquery" "2.2.4" "2.2.4" "0kaln93pzjlr4vqf2zvsm9dwgjkrii9xlsqg48hc1vs16cl109rn")
   (fetchbower "tweetnacl" "0.12.2" "0.12.2" "1lfzbfrdaly3zyzbcp1p53yhxlrx56k8x04q924kg7l52gblm65g")
   (fetchbower "components-font-awesome" "4.7.0" "^4.6.3" "1w27im6ayjrbgjqa0i49ml5d3wy4ld40h9b29hz9myv77bpx4lg1")
@@ -21,7 +21,7 @@ buildEnv { name = "bower-env"; ignoreCollisions = true; paths = [
   (fetchbower "scrypt-async" "1.2.0" "1.2.0" "0d076ax708p9b8hcmk4f82j925nlnm0hmp0ni45ql37g7iirfpyv")
   (fetchbower "require-css" "0.1.10" "0.1.10" "106gz9i76v71q9zx2pnqkkj342m630lvssnw54023a0ljc0gqcwq")
   (fetchbower "less" "3.7.1" "3.7.1" "1n7ps4xlbrc9m63b3q62mg3p6i7d5hwchhpjshb0drzj5crvz556")
-  (fetchbower "bootstrap" "3.1.1" "~3.1.1" "sha256-IaC09U2JVjflgcZQ3GbmNnwCUGv+TTnyXb+eixSXcBk=")
+  (fetchbower "bootstrap" "3.1.1" "~3.1.1" "06bhjwa8p7mzbpr3jkgydd804z1nwrkdql66h7jkfml99psv9811")
   (fetchbower "bootstrap" "4.4.1" "^v4.0.0" "0a3y5s6236jjw0ppzwdysf5mn87308ndadw1rgwgwswr9cgkz2ak")
   (fetchbower "diff-dom" "2.1.1" "2.1.1" "0nrn6xqlhp0p5ixjxdk8qg3939crkggh1l8swd20d7bsz186l5f1")
   (fetchbower "nthen" "0.1.7" "0.1.7" "03yap5ildigaw4rwxmxs37pcwhq415iham8w39zd56ka98gpfxa5")
diff --git a/pkgs/tools/admin/aws-rotate-key/default.nix b/pkgs/tools/admin/aws-rotate-key/default.nix
index 228aa5a26a25..9c2f747e1558 100644
--- a/pkgs/tools/admin/aws-rotate-key/default.nix
+++ b/pkgs/tools/admin/aws-rotate-key/default.nix
@@ -10,7 +10,7 @@ buildGoPackage rec {
     rev = "v${version}";
     owner = "Fullscreen";
     repo = "aws-rotate-key";
-    sha256 = "sha256:1w9704g1l2b0y6g6mk79g28kk0yaswpgljkk85d0i10wyxq4icby";
+    sha256 = "1w9704g1l2b0y6g6mk79g28kk0yaswpgljkk85d0i10wyxq4icby";
   };
 
   goDeps = ./deps.nix;
diff --git a/pkgs/tools/admin/lego/default.nix b/pkgs/tools/admin/lego/default.nix
index 025afe25e87a..fff8e39aa114 100644
--- a/pkgs/tools/admin/lego/default.nix
+++ b/pkgs/tools/admin/lego/default.nix
@@ -8,7 +8,7 @@ buildGoModule rec {
     owner = "go-acme";
     repo = pname;
     rev = "v${version}";
-    hash = "sha256-hjH1TBw6GHYNI9JSBOzdyEtJmp8NhlwNYydGZwsjAg0=";
+    sha256 = "03824c5nfii7cc6mr1hdkyd4jjy8vpn08lnj4c6pc61s3i6gacc6";
   };
 
   vendorSha256 = "14453iiya6algkympyvwm03qgjcwk79z8bbrij7qhnp52qfrbmrp";
diff --git a/pkgs/tools/backup/easysnap/default.nix b/pkgs/tools/backup/easysnap/default.nix
index 9b5450ba7a3b..5c2ad1a50a7b 100644
--- a/pkgs/tools/backup/easysnap/default.nix
+++ b/pkgs/tools/backup/easysnap/default.nix
@@ -8,7 +8,7 @@ stdenv.mkDerivation {
     owner = "sjau";
     repo = "easysnap";
     rev = "26f89c0c3cda01e2595ee19ae5fb8518da25b4ef";
-    sha256 = "sha256:1k49k1m7y8s099wyiiz8411i77j1156ncirynmjfyvdhmhcyp5rw";
+    sha256 = "1k49k1m7y8s099wyiiz8411i77j1156ncirynmjfyvdhmhcyp5rw";
   };
 
   installPhase = ''
diff --git a/pkgs/tools/misc/h/default.nix b/pkgs/tools/misc/h/default.nix
index f4897a54cb13..9a80945097b7 100644
--- a/pkgs/tools/misc/h/default.nix
+++ b/pkgs/tools/misc/h/default.nix
@@ -8,7 +8,7 @@ stdenv.mkDerivation rec {
     owner = "zimbatm";
     repo = "h";
     rev = "v${version}";
-    hash = "sha256-chGrMtvLyyNtlM7PO1olVdkzkvMOk6OibHw+mqwVxIM=";
+    sha256 = "10y42nn9lgkwdjia74qfyf937nam4md3pkyfjinj7jybvcran4bj";
   };
 
   buildInputs = [ ruby ];
diff --git a/pkgs/tools/package-management/nix/default.nix b/pkgs/tools/package-management/nix/default.nix
index 4337705db2f0..6b512c253cee 100644
--- a/pkgs/tools/package-management/nix/default.nix
+++ b/pkgs/tools/package-management/nix/default.nix
@@ -216,7 +216,7 @@ in rec {
       owner = "NixOS";
       repo = "nix";
       rev = "00b562c87ec4c3bbe514f5dc1f4d1c41f66f66bf";
-      hash = "sha256-GqTFh4wBfkKapixKyd3gA9C1tF0PSzZDD5LN+5nQEWk=";
+      sha256 = "0s8is2czpkcj1x1kcjqgbnsbbl03w3fwjjiclsd44zh1ij3wb90s";
     };
 
     crates = fetchurl {
diff --git a/pkgs/tools/security/gnupg-pkcs11-scd/default.nix b/pkgs/tools/security/gnupg-pkcs11-scd/default.nix
index 4d6b97c7192e..e173f66f7483 100644
--- a/pkgs/tools/security/gnupg-pkcs11-scd/default.nix
+++ b/pkgs/tools/security/gnupg-pkcs11-scd/default.nix
@@ -7,7 +7,7 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     url = "https://github.com/alonbl/${pname}/releases/download/${pname}-${version}/${pname}-${version}.tar.bz2";
-    sha256 = "sha256:1mfh9zjbahjd788rq1mzx009pd7p1sq62sbz586rd7szif7pkpgx";
+    sha256 = "1mfh9zjbahjd788rq1mzx009pd7p1sq62sbz586rd7szif7pkpgx";
   };
 
   buildInputs = [ pkcs11helper pkgconfig openssl ];