diff --git a/packages/as-contracts/assembly/env.ts b/packages/as-contracts/assembly/env.ts
index 8a7c2e2..a9bad98 100644
--- a/packages/as-contracts/assembly/env.ts
+++ b/packages/as-contracts/assembly/env.ts
@@ -96,12 +96,6 @@ export declare function ext_hash_sha2_256(
   output_ptr: i32)
 : void;
 
-export declare function ext_hash_sha2_256(
-  input_ptr: i32,
-  input_len: i32,
-  output_ptr: i32)
-: void;
-
 // Instantiate a contract with the specified code hash.
 export declare function ext_instantiate(
   code_hash_ptr: i32,
diff --git a/packages/as-contracts/assembly/lib/contract.ts b/packages/as-contracts/assembly/lib/contract.ts
index 7df3ba6..840a3e4 100644
--- a/packages/as-contracts/assembly/lib/contract.ts
+++ b/packages/as-contracts/assembly/lib/contract.ts
@@ -112,6 +112,6 @@ export namespace contract {
    */ 
   export function setRentAllowance(value: u128): void {
     const valueBuffer = value.toUint8Array();
-    ext_set_rent_allowance(valueBuffer.dataStart, valueBuffer.length);
+    ext_set_rent_allowance(valueBuffer.dataStart as i32, valueBuffer.length);
   }
 }
\ No newline at end of file
diff --git a/packages/as-contracts/assembly/lib/crypto.ts b/packages/as-contracts/assembly/lib/crypto.ts
index 6d24a40..c9a6e81 100644
--- a/packages/as-contracts/assembly/lib/crypto.ts
+++ b/packages/as-contracts/assembly/lib/crypto.ts
@@ -22,7 +22,7 @@ export namespace crypto {
 
   export function blake2b128(value: Uint8Array): Uint8Array {
     const sha256 = new Uint8Array(32);
-    ext_hash_blake2_128(value.dataStart, value.length, sha256.dataStart)
+    ext_hash_blake2_128(value.dataStart as i32, value.length, sha256.dataStart as i32)
     return sha256;
   }
 
@@ -34,7 +34,7 @@ export namespace crypto {
 
   export function blake2b256(value: Uint8Array): Uint8Array {
     const sha256 = new Uint8Array(32);
-    ext_hash_blake2_256(value.dataStart, value.length, sha256.dataStart)
+    ext_hash_blake2_256(value.dataStart as i32, value.length, sha256.dataStart as i32)
     return sha256;
   }
 
@@ -46,7 +46,7 @@ export namespace crypto {
 
   export function keccack256(value: Uint8Array): Uint8Array {
     const sha256 = new Uint8Array(32);
-    ext_hash_keccak_256(value.dataStart, value.length, sha256.dataStart)
+    ext_hash_keccak_256(value.dataStart as i32, value.length, sha256.dataStart as i32)
     return sha256;
   }
 
@@ -58,7 +58,7 @@ export namespace crypto {
 
   export function sha256(value: Uint8Array): Uint8Array {
     const sha256 = new Uint8Array(32);
-    ext_hash_sha2_256(value.dataStart, value.length, sha256.dataStart)
+    ext_hash_sha2_256(value.dataStart as i32, value.length, sha256.dataStart as i32)
     return sha256;
   }
 }
diff --git a/packages/as-contracts/assembly/lib/dev.ts b/packages/as-contracts/assembly/lib/dev.ts
index 13089f9..0431c58 100644
--- a/packages/as-contracts/assembly/lib/dev.ts
+++ b/packages/as-contracts/assembly/lib/dev.ts
@@ -8,6 +8,6 @@ export namespace dev {
   export function printLine(value: string): void {
     const string = String.UTF8.encode(value);
     const stringArray = Uint8Array.wrap(string);
-    ext_println(stringArray.dataStart, string.byteLength);
+    ext_println(stringArray.dataStart as i32, string.byteLength);
   }
 } 
\ No newline at end of file
diff --git a/packages/as-contracts/assembly/lib/storage.ts b/packages/as-contracts/assembly/lib/storage.ts
index f82688c..4af07b3 100644
--- a/packages/as-contracts/assembly/lib/storage.ts
+++ b/packages/as-contracts/assembly/lib/storage.ts
@@ -28,10 +28,10 @@ export namespace storage{
    */
   export function set(key: Uint8Array, value: Uint8Array | null): void {
     if(key.length === 32) {
-      const pointer = value ? value!.dataStart : 0;
+      const pointer = value!.dataStart as i32 || 0;
       const length = value ? value.length : 0;
     
-      ext_set_storage(key.dataStart, pointer, length);
+      ext_set_storage(key.dataStart as i32, pointer, length);
     }
   }
 
@@ -42,14 +42,14 @@ export namespace storage{
    */
   export function get(key: Uint8Array): Uint8Array {
      // @TODO check for key.length 32 
-    const result = ext_get_storage(key.dataStart);
+    const result = ext_get_storage(key.dataStart as i32);
     let value = new Uint8Array(0);
 
     if (result === StorageResult.Value) {
       const size = ext_scratch_size();
       if (size > 0) {
         value = new Uint8Array(size);
-        ext_scratch_read(value.dataStart, 0, size);
+        ext_scratch_read(value.dataStart as i32, 0, size);
       }
     }
     return value;
@@ -66,7 +66,7 @@ export namespace storage{
   
     if (size > 0) {
       value = new Uint8Array(size);
-      ext_scratch_read(value.dataStart, 0, size);
+      ext_scratch_read(value.dataStart as i32, 0, size);
     }
     return value;
   }
@@ -79,10 +79,10 @@ export namespace storage{
    *  of zero clears the scratch buffer.
    */
   export function setScratchBuffer(data: Uint8Array): void {
-    ext_scratch_write(data.dataStart, data.length);
+    ext_scratch_write(data.dataStart as i32, data.length);
   }
 
   export function clear(key: Uint8Array): void {
-    ext_clear_storage(key.dataStart);
+    ext_clear_storage(key.dataStart as i32);
   }
 }
diff --git a/packages/as-contracts/package.json b/packages/as-contracts/package.json
index 2857c4c..6abd115 100644
--- a/packages/as-contracts/package.json
+++ b/packages/as-contracts/package.json
@@ -6,7 +6,7 @@
   "license": "Apache-2.0",
   "ascMain": "assembly/index.ts",
   "scripts": {
-    "build:optimized": "asc assembly/index.ts -b build/contract.wasm -t build/contract.wat --importMemory --noAssert --use abort=  --sourceMap --validate --optimize",
+    "build:optimized": "asc assembly/index.ts -b build/contract.wasm -t build/contract.wat --importMemory --noAssert --use abort=  --sourceMap --optimize",
     "build:tsd": "asc assembly/index.ts -d build/index.d.ts",
     "build": "yarn build:tsd && yarn build:optimized",
     "test": "asp"
@@ -26,4 +26,4 @@
     "README.md",
     "LICENSE"
   ]
-}
+}
\ No newline at end of file
diff --git a/packages/as-types/package.json b/packages/as-types/package.json
index 1cede35..8120b94 100644
--- a/packages/as-types/package.json
+++ b/packages/as-types/package.json
@@ -5,7 +5,7 @@
   "author": "Stefanie Doll",
   "license": "Apache-2.0",
   "scripts": {
-    "build:optimized": "asc assembly/index.ts -b build/types.wasm -t build/types.wat --importMemory --noAssert --use abort=  --sourceMap --validate --optimize",
+    "build:optimized": "asc assembly/index.ts -b build/types.wasm -t build/types.wat --importMemory --noAssert --use abort=  --sourceMap --optimize",
     "build:tsd": "asc assembly/index.ts -d build/index.d.ts",
     "build": "yarn build:tsd && yarn build:optimized",
     "test": "asp"
diff --git a/packages/as-utils/package.json b/packages/as-utils/package.json
index 464d4f0..4fedf24 100644
--- a/packages/as-utils/package.json
+++ b/packages/as-utils/package.json
@@ -7,7 +7,7 @@
   "main": "js/index.js",
   "types": "assembly/index.ts",
   "scripts": {
-    "build:optimized": "asc assembly/index.ts -b build/utils.wasm -t build/utils.wat --importMemory --noAssert --use abort=  --sourceMap --validate --optimize",
+    "build:optimized": "asc assembly/index.ts -b build/utils.wasm -t build/utils.wat --importMemory --noAssert --use abort=  --sourceMap --optimize",
     "build:tsd": "asc assembly/index.ts -d build/index.d.ts",
     "build": "yarn build:tsd && yarn build:optimized",
     "test": "asp"
diff --git a/projects/test-contract/package.json b/projects/test-contract/package.json
index 4dde434..ddbd24f 100755
--- a/projects/test-contract/package.json
+++ b/projects/test-contract/package.json
@@ -7,7 +7,7 @@
   "types": "build/index.d.ts",
   "license": "Apache-2.0",
   "scripts": {
-    "build:optimized": "asc assembly/index.ts -b build/test-contract.wasm -t build/test-contract.wat --importMemory --noAssert --use abort= --validate --optimize",
+    "build:optimized": "asc assembly/index.ts -b build/test-contract.wasm -t build/test-contract.wat --importMemory --noAssert --use abort= --optimize",
     "build:tsd": "asc assembly/index.ts -d build/index.d.ts",
     "build": "yarn build:optimized && yarn build:tsd"
   },
@@ -20,4 +20,4 @@
     "@substrate/as-utils": "0.0.1",
     "@as-pect/cli": "^2.7.0"
   }
-}
\ No newline at end of file
+}