diff --git a/packages/api-format/package.json b/packages/api-format/package.json
index e9499ad36843..84a00677710a 100644
--- a/packages/api-format/package.json
+++ b/packages/api-format/package.json
@@ -35,7 +35,6 @@
   "dependencies": {
     "@polkadot/primitives-json": "^0.10.1",
     "@polkadot/util": "^0.19.1",
-    "@polkadot/util-crypto": "^0.19.1",
     "babel-runtime": "^6.26.0"
   }
 }
diff --git a/packages/api-format/src/output.js b/packages/api-format/src/output.js
index db3d7dbe2814..35b443fa5e8b 100644
--- a/packages/api-format/src/output.js
+++ b/packages/api-format/src/output.js
@@ -10,7 +10,6 @@ const bytesDecode = require('@polkadot/primitives-json/bytes/decode');
 const headerDecode = require('@polkadot/primitives-json/header/decode');
 const isNull = require('@polkadot/util/is/null');
 const isUndefined = require('@polkadot/util/is/undefined');
-const blake2Asu8a256 = require('@polkadot/util-crypto/blake2/asU8a256');
 
 const format = require('./format');
 
@@ -21,23 +20,10 @@ const formatters = {
   'U64': bnDecode
 };
 
-module.exports = function formatOutput ({ type, withHash }: InterfaceOutputType, value?: mixed): ?mixed {
+module.exports = function formatOutput (output: InterfaceOutputType, value?: mixed): ?mixed {
   if (isUndefined(value) || isNull(value)) {
     return value;
   }
 
-  const decoded = format(formatters, [type], [value])[0];
-
-  // flowlint-next-line sketchy-null-bool:off
-  if (!withHash) {
-    return decoded;
-  }
-
-  // flowlint-next-line unclear-type:off
-  const hash = blake2Asu8a256(((value: any): Uint8Array));
-
-  return {
-    [type.toLowerCase()]: decoded,
-    hash
-  };
+  return format(formatters, [output.type], [value])[0];
 };
diff --git a/packages/api-jsonrpc/src/chain/newHead.js b/packages/api-jsonrpc/src/chain/newHead.js
index f3fbaf67ab57..36125669063e 100644
--- a/packages/api-jsonrpc/src/chain/newHead.js
+++ b/packages/api-jsonrpc/src/chain/newHead.js
@@ -16,7 +16,6 @@ module.exports = ({
   isSubscription: true,
   inputs: [],
   output: {
-    type: 'Header',
-    withHash: true
+    type: 'Header'
   }
 }: InterfaceMethodDefinition);
diff --git a/packages/api-jsonrpc/src/types.js b/packages/api-jsonrpc/src/types.js
index 726031b4a5b0..ae057f79033f 100644
--- a/packages/api-jsonrpc/src/types.js
+++ b/packages/api-jsonrpc/src/types.js
@@ -16,8 +16,7 @@ export type InterfaceInputType = {
 };
 
 export type InterfaceOutputType = {
-  type: FormatOutputType,
-  withHash?: boolean
+  type: FormatOutputType
 };
 
 export type InterfaceMethodDefinition$Subscribe = {