diff --git a/lib/runtime/wasmer/helpers.go b/lib/runtime/wasmer/helpers.go
index ea894fc8d1..54bfaa8d61 100644
--- a/lib/runtime/wasmer/helpers.go
+++ b/lib/runtime/wasmer/helpers.go
@@ -47,16 +47,12 @@ func toWasmMemory(context wasmer.InstanceContext, data []byte) (
 }
 
 // toWasmMemorySized copies a Go byte slice to wasm memory and returns the corresponding
-// 32 bit pointer.
-func toWasmMemorySized(context wasmer.InstanceContext, data []byte, size uint32) (
+// 32 bit pointer. Note the data must have a well known fixed length in the runtime.
+func toWasmMemorySized(context wasmer.InstanceContext, data []byte) (
 	pointer uint32, err error) {
-	if int(size) != len(data) {
-		// Programming error
-		panic(fmt.Sprintf("data is %d bytes but size specified is %d", len(data), size))
-	}
-
 	allocator := context.Data().(*runtime.Context).Allocator
 
+	size := uint32(len(data))
 	ptr, err := allocator.Allocate(size)
 	if err != nil {
 		return 0, fmt.Errorf("allocating: %w", err)
diff --git a/lib/runtime/wasmer/imports.go b/lib/runtime/wasmer/imports.go
index 9acf0b92e1..62d764a0f1 100644
--- a/lib/runtime/wasmer/imports.go
+++ b/lib/runtime/wasmer/imports.go
@@ -257,7 +257,7 @@ func ext_crypto_ed25519_generate_version_1(context unsafe.Pointer, keyTypeID C.i
 		return 0
 	}
 
-	ret, err := toWasmMemorySized(instanceContext, kp.Public().Encode(), 32)
+	ret, err := toWasmMemorySized(instanceContext, kp.Public().Encode())
 	if err != nil {
 		logger.Warnf("failed to allocate memory: %s", err)
 		return 0
@@ -576,7 +576,7 @@ func ext_crypto_sr25519_generate_version_1(context unsafe.Pointer, keyTypeID C.i
 		return 0
 	}
 
-	ret, err := toWasmMemorySized(instanceContext, kp.Public().Encode(), 32)
+	ret, err := toWasmMemorySized(instanceContext, kp.Public().Encode())
 	if err != nil {
 		logger.Errorf("failed to allocate memory: %s", err)
 		return 0
@@ -1318,7 +1318,7 @@ func ext_hashing_blake2_128_version_1(context unsafe.Pointer, dataSpan C.int64_t
 		"data 0x%x has hash 0x%x",
 		data, hash)
 
-	out, err := toWasmMemorySized(instanceContext, hash, 16)
+	out, err := toWasmMemorySized(instanceContext, hash)
 	if err != nil {
 		logger.Errorf("failed to allocate: %s", err)
 		return 0
@@ -1342,7 +1342,7 @@ func ext_hashing_blake2_256_version_1(context unsafe.Pointer, dataSpan C.int64_t
 
 	logger.Debugf("data 0x%x has hash %s", data, hash)
 
-	out, err := toWasmMemorySized(instanceContext, hash[:], 32)
+	out, err := toWasmMemorySized(instanceContext, hash[:])
 	if err != nil {
 		logger.Errorf("failed to allocate: %s", err)
 		return 0
@@ -1366,7 +1366,7 @@ func ext_hashing_keccak_256_version_1(context unsafe.Pointer, dataSpan C.int64_t
 
 	logger.Debugf("data 0x%x has hash %s", data, hash)
 
-	out, err := toWasmMemorySized(instanceContext, hash[:], 32)
+	out, err := toWasmMemorySized(instanceContext, hash[:])
 	if err != nil {
 		logger.Errorf("failed to allocate: %s", err)
 		return 0
@@ -1385,7 +1385,7 @@ func ext_hashing_sha2_256_version_1(context unsafe.Pointer, dataSpan C.int64_t)
 
 	logger.Debugf("data 0x%x has hash %s", data, hash)
 
-	out, err := toWasmMemorySized(instanceContext, hash[:], 32)
+	out, err := toWasmMemorySized(instanceContext, hash[:])
 	if err != nil {
 		logger.Errorf("failed to allocate: %s", err)
 		return 0
@@ -1409,7 +1409,7 @@ func ext_hashing_twox_256_version_1(context unsafe.Pointer, dataSpan C.int64_t)
 
 	logger.Debugf("data 0x%x has hash %s", data, hash)
 
-	out, err := toWasmMemorySized(instanceContext, hash[:], 32)
+	out, err := toWasmMemorySized(instanceContext, hash[:])
 	if err != nil {
 		logger.Errorf("failed to allocate: %s", err)
 		return 0
@@ -1434,7 +1434,7 @@ func ext_hashing_twox_128_version_1(context unsafe.Pointer, dataSpan C.int64_t)
 		"data 0x%x hash hash 0x%x",
 		data, hash)
 
-	out, err := toWasmMemorySized(instanceContext, hash, 16)
+	out, err := toWasmMemorySized(instanceContext, hash)
 	if err != nil {
 		logger.Errorf("failed to allocate: %s", err)
 		return 0
@@ -1460,7 +1460,7 @@ func ext_hashing_twox_64_version_1(context unsafe.Pointer, dataSpan C.int64_t) C
 		"data 0x%x has hash 0x%x",
 		data, hash)
 
-	out, err := toWasmMemorySized(instanceContext, hash, 8)
+	out, err := toWasmMemorySized(instanceContext, hash)
 	if err != nil {
 		logger.Errorf("failed to allocate: %s", err)
 		return 0
@@ -1632,13 +1632,8 @@ func ext_offchain_network_state_version_1(context unsafe.Pointer) C.int64_t {
 		return 0
 	}
 
-	// copy network state length to memory writtenOut location
-	nsEncLen := uint32(len(nsEnc))
-	buf := make([]byte, 4)
-	binary.LittleEndian.PutUint32(buf, nsEncLen)
-
 	// allocate memory for value and copy value to memory
-	ptr, err := toWasmMemorySized(instanceContext, nsEnc, nsEncLen)
+	ptr, err := toWasmMemorySized(instanceContext, nsEnc)
 	if err != nil {
 		logger.Errorf("failed to allocate memory: %s", err)
 		return 0
@@ -1657,7 +1652,7 @@ func ext_offchain_random_seed_version_1(context unsafe.Pointer) C.int32_t {
 	if err != nil {
 		logger.Errorf("failed to generate random seed: %s", err)
 	}
-	ptr, err := toWasmMemorySized(instanceContext, seed, 32)
+	ptr, err := toWasmMemorySized(instanceContext, seed)
 	if err != nil {
 		logger.Errorf("failed to allocate memory: %s", err)
 	}