diff --git a/libraries/eosiolib/capi/eosio/privileged.h b/libraries/eosiolib/capi/eosio/privileged.h
index c304cf7b7a..523bf436a3 100644
--- a/libraries/eosiolib/capi/eosio/privileged.h
+++ b/libraries/eosiolib/capi/eosio/privileged.h
@@ -1,5 +1,5 @@
 #pragma once
-
+#include "types.h"
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -105,7 +105,14 @@ void set_blockchain_parameters_packed( char* data, uint32_t datalen );
 __attribute__((eosio_wasm_import))
 uint32_t get_blockchain_parameters_packed( char* data, uint32_t datalen );
 
+/**
+ * Pre-activate protocol feature
+ *
+ * @param feature_digest - digest of the protocol feature to pre-activate
+ */
+__attribute__((eosio_wasm_import))
+void preactivate_feature( const capi_checksum256* feature_digest );
+
 #ifdef __cplusplus
 }
 #endif
-
diff --git a/libraries/eosiolib/capi/eosio/system.h b/libraries/eosiolib/capi/eosio/system.h
index 95186027dc..b7b7cb63a1 100644
--- a/libraries/eosiolib/capi/eosio/system.h
+++ b/libraries/eosiolib/capi/eosio/system.h
@@ -76,6 +76,23 @@ void eosio_exit( int32_t code );
 __attribute__((eosio_wasm_import))
 uint64_t  current_time();
 
+/**
+ * Check if specified protocol feature has been activated
+ *
+ * @param feature_digest - digest of the protocol feature
+ * @return true if the specified protocol feature has been activated, false otherwise
+ */
+__attribute__((eosio_wasm_import))
+bool is_feature_activated( const capi_checksum256* feature_digest );
+
+/**
+ * Return name of account that sent current inline action
+ *
+ * @return name of account that sent the current inline action (empty name if not called from inline action)
+ */
+__attribute__((eosio_wasm_import))
+capi_name get_sender();
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/libraries/eosiolib/contracts/eosio/privileged.hpp b/libraries/eosiolib/contracts/eosio/privileged.hpp
index a17375fca2..53f194ef09 100644
--- a/libraries/eosiolib/contracts/eosio/privileged.hpp
+++ b/libraries/eosiolib/contracts/eosio/privileged.hpp
@@ -1,5 +1,6 @@
 #pragma once
 #include "producer_schedule.hpp"
+#include "system.hpp"
 #include "../../core/eosio/crypto.hpp"
 #include "../../core/eosio/name.hpp"
 #include "../../core/eosio/serialize.hpp"
@@ -11,23 +12,29 @@ namespace eosio {
          __attribute__((eosio_wasm_import))
          bool is_privileged( uint64_t account );
 
-        __attribute__((eosio_wasm_import))
-        void get_resource_limits( uint64_t account, int64_t* ram_bytes, int64_t* net_weight, int64_t* cpu_weight );
+         __attribute__((eosio_wasm_import))
+         void get_resource_limits( uint64_t account, int64_t* ram_bytes, int64_t* net_weight, int64_t* cpu_weight );
+
+         __attribute__((eosio_wasm_import))
+         void set_resource_limits( uint64_t account, int64_t ram_bytes, int64_t net_weight, int64_t cpu_weight );
+
+         __attribute__((eosio_wasm_import))
+         void set_privileged( uint64_t account, bool is_priv );
 
-        __attribute__((eosio_wasm_import))
-        void set_resource_limits( uint64_t account, int64_t ram_bytes, int64_t net_weight, int64_t cpu_weight );
+         __attribute__((eosio_wasm_import))
+         void set_blockchain_parameters_packed( char* data, uint32_t datalen );
 
-        __attribute__((eosio_wasm_import))
-        void set_privileged( uint64_t account, bool is_priv );
+         __attribute__((eosio_wasm_import))
+         uint32_t get_blockchain_parameters_packed( char* data, uint32_t datalen );
 
-        __attribute__((eosio_wasm_import))
-        void set_blockchain_parameters_packed( char* data, uint32_t datalen );
+         __attribute((eosio_wasm_import))
+         int64_t set_proposed_producers( char*, uint32_t );
 
-        __attribute__((eosio_wasm_import))
-        uint32_t get_blockchain_parameters_packed( char* data, uint32_t datalen );
+         __attribute__((eosio_wasm_import))
+         void preactivate_feature( const capi_checksum256* feature_digest );
 
-        __attribute((eosio_wasm_import))
-        int64_t set_proposed_producers( char*, uint32_t );
+         __attribute__((eosio_wasm_import))
+         int64_t set_proposed_producers_ex( uint64_t producer_data_format, char *producer_data, uint32_t producer_data_size );
       }
    }
 
@@ -221,7 +228,13 @@ namespace eosio {
     *
     *  @return an optional value of the version of the new proposed schedule if successful
     */
-   std::optional<uint64_t> set_proposed_producers( const std::vector<producer_authority>& prods );
+   inline std::optional<uint64_t> set_proposed_producers( const std::vector<producer_authority>& prods ) {
+      auto packed_prods = eosio::pack( prods );
+      int64_t ret = internal_use_do_not_use::set_proposed_producers_ex(1, (char*)packed_prods.data(), packed_prods.size());
+      if (ret >= 0)
+        return static_cast<uint64_t>(ret);
+      return {};
+   }
 
    /**
     *  Check if an account is privileged
@@ -246,4 +259,17 @@ namespace eosio {
       internal_use_do_not_use::set_privileged( account.value, is_priv );
    }
 
+   /**
+    * Pre-activate protocol feature
+    *
+    * @ingroup privileged
+    * @param feature_digest - digest of the protocol feature to pre-activate
+    */
+   inline void preactivate_feature( const checksum256& feature_digest ) {
+      auto feature_digest_data = feature_digest.extract_as_byte_array();
+      internal_use_do_not_use::preactivate_feature(
+         reinterpret_cast<const internal_use_do_not_use::capi_checksum256*>( feature_digest_data.data() )
+      );
+   }
+
 }
diff --git a/libraries/eosiolib/contracts/eosio/system.hpp b/libraries/eosiolib/contracts/eosio/system.hpp
index a65f924319..5c5c21926b 100644
--- a/libraries/eosiolib/contracts/eosio/system.hpp
+++ b/libraries/eosiolib/contracts/eosio/system.hpp
@@ -5,12 +5,24 @@
 #pragma once
 #include "../../core/eosio/time.hpp"
 #include "../../core/eosio/check.hpp"
+#include "../../core/eosio/fixed_bytes.hpp"
+#include "../../core/eosio/name.hpp"
 
 namespace eosio {
   namespace internal_use_do_not_use {
     extern "C" {
       __attribute__((eosio_wasm_import, noreturn))
       void eosio_exit( int32_t code );
+
+      struct  __attribute__((aligned (16))) capi_checksum256 {
+         uint8_t hash[32];
+      };
+
+      __attribute__((eosio_wasm_import))
+      bool is_feature_activated( const capi_checksum256* feature_digest );
+
+      __attribute__((eosio_wasm_import))
+      uint64_t get_sender();
     }
   }
 
@@ -53,4 +65,29 @@ namespace eosio {
    *  @return time in microseconds from 1970 of the current block as a block_timestamp
    */
    block_timestamp current_block_time();
+
+
+   /**
+    * Check if specified protocol feature has been activated
+    *
+    * @ingroup system
+    * @param feature_digest - digest of the protocol feature
+    * @return true if the specified protocol feature has been activated, false otherwise
+    */
+   inline bool is_feature_activated( const checksum256& feature_digest ) {
+      auto feature_digest_data = feature_digest.extract_as_byte_array();
+      return internal_use_do_not_use::is_feature_activated(
+         reinterpret_cast<const internal_use_do_not_use::capi_checksum256*>( feature_digest_data.data() )
+      );
+   }
+
+   /**
+    * Return name of account that sent current inline action
+    *
+    * @ingroup system
+    * @return name of account that sent the current inline action (empty name if not called from inline action)
+    */
+   inline name get_sender() {
+      return name( internal_use_do_not_use::get_sender() );
+   }
 }
diff --git a/libraries/eosiolib/eosiolib.cpp b/libraries/eosiolib/eosiolib.cpp
index fb1bf9b165..b92bb10130 100644
--- a/libraries/eosiolib/eosiolib.cpp
+++ b/libraries/eosiolib/eosiolib.cpp
@@ -16,8 +16,6 @@ namespace eosio {
      __attribute__((eosio_wasm_import))
      int64_t set_proposed_producers( char *producer_data, uint32_t producer_data_size );
      __attribute__((eosio_wasm_import))
-     int64_t set_proposed_producers_ex( uint64_t producer_data_format, char *producer_data, uint32_t producer_data_size );
-     __attribute__((eosio_wasm_import))
      uint32_t get_active_producers(uint64_t*, uint32_t);
    }
 
@@ -45,14 +43,6 @@ namespace eosio {
       return {};
    }
 
-   std::optional<uint64_t> set_proposed_producers( const std::vector<producer_authority>& prods ) {
-      auto packed_prods = eosio::pack( prods );
-      int64_t ret = set_proposed_producers_ex(1, (char*)packed_prods.data(), packed_prods.size());
-      if (ret >= 0)
-        return static_cast<uint64_t>(ret);
-      return {};
-   }
-
    // system.hpp
    time_point current_time_point() {
       static auto ct = time_point(microseconds(static_cast<int64_t>(current_time())));
diff --git a/libraries/native/intrinsics.cpp b/libraries/native/intrinsics.cpp
index adb68a6839..e023fbd736 100644
--- a/libraries/native/intrinsics.cpp
+++ b/libraries/native/intrinsics.cpp
@@ -40,6 +40,12 @@ extern "C" {
    void set_privileged( capi_name account, bool is_priv ) {
       return intrinsics::get().call<intrinsics::set_privileged>(account, is_priv);
    }
+   bool is_feature_activated( const capi_checksum256* feature_digest ) {
+      return intrinsics::get().call<intrinsics::is_feature_activated>(feature_digest);
+   }
+   void preactivate_feature( const capi_checksum256* feature_digest ) {
+      return intrinsics::get().call<intrinsics::preactivate_feature>(feature_digest);
+   }
    uint32_t get_active_producers( capi_name* producers, uint32_t datalen ) {
       return intrinsics::get().call<intrinsics::get_active_producers>(producers, datalen);
    }
@@ -334,6 +340,9 @@ extern "C" {
    int get_context_free_data( uint32_t index, char* buff, size_t size ) {
       return intrinsics::get().call<intrinsics::get_context_free_data>(index, buff, size);
    }
+   capi_name get_sender() {
+      return intrinsics::get().call<intrinsics::get_sender>();
+   }
 
    // softfloat
    static constexpr uint32_t inv_float_eps = 0x4B000000;
@@ -788,7 +797,7 @@ extern "C" {
    void printui(uint64_t value) {
       return intrinsics::get().call<intrinsics::printui>(value);
    }
-   
+
    void printi128(const int128_t* value) {
       return intrinsics::get().call<intrinsics::printi128>(value);
    }
@@ -796,7 +805,7 @@ extern "C" {
     void printui128(const uint128_t* value) {
       return intrinsics::get().call<intrinsics::printui128>(value);
    }
-  
+
    void printsf(float value) {
       return intrinsics::get().call<intrinsics::printsf>(value);
    }
@@ -808,11 +817,11 @@ extern "C" {
    void printqf(const long double* value) {
       return intrinsics::get().call<intrinsics::printqf>(value);
    }
-   
+
    void printn(uint64_t nm) {
       return intrinsics::get().call<intrinsics::printn>(nm);
    }
-   
+
    void printhex(const void* data, uint32_t len) {
       return intrinsics::get().call<intrinsics::printhex>(data, len);
    }
@@ -844,7 +853,7 @@ extern "C" {
          dest[i] = tmp_buf[i];
       return (void*)dest;
    }
-   
+
    void eosio_assert(uint32_t test, const char* msg) {
       if (test == 0) {
          _prints(msg, eosio::cdt::output_stream_kind::std_err);
@@ -870,9 +879,9 @@ extern "C" {
          longjmp(*___env_ptr, 1);
       }
    }
-   
+
 #pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Winvalid-noreturn" 
+#pragma clang diagnostic ignored "-Winvalid-noreturn"
    void abort() {
       eosio_assert(false, "abort");
    }
diff --git a/libraries/native/native/eosio/intrinsics_def.hpp b/libraries/native/native/eosio/intrinsics_def.hpp
index a6f59098e9..9166d1f2a4 100644
--- a/libraries/native/native/eosio/intrinsics_def.hpp
+++ b/libraries/native/native/eosio/intrinsics_def.hpp
@@ -29,15 +29,15 @@ namespace eosio { namespace native {
    auto get_args(R(Args...)) {
        return std::tuple<std::decay_t<Args>...>{};
    }
-   
+
    template <typename R, typename Args, size_t... Is>
    auto create_function(std::index_sequence<Is...>) {
-      return std::function<R(typename std::tuple_element<Is, Args>::type ...)>{ 
-         [](typename std::tuple_element<Is, Args>::type ...) { 
+      return std::function<R(typename std::tuple_element<Is, Args>::type ...)>{
+         [](typename std::tuple_element<Is, Args>::type ...) {
             eosio_assert(false, "unsupported intrinsic"); return (R)0;
          }
       };
-   }   
+   }
 
 #define INTRINSICS(intrinsic_macro) \
 intrinsic_macro(get_resource_limits) \
@@ -48,6 +48,8 @@ intrinsic_macro(get_blockchain_parameters_packed) \
 intrinsic_macro(set_blockchain_parameters_packed) \
 intrinsic_macro(is_privileged) \
 intrinsic_macro(set_privileged) \
+intrinsic_macro(is_feature_activated) \
+intrinsic_macro(preactivate_feature) \
 intrinsic_macro(get_active_producers) \
 intrinsic_macro(db_idx64_store) \
 intrinsic_macro(db_idx64_remove) \
@@ -154,7 +156,8 @@ intrinsic_macro(send_inline) \
 intrinsic_macro(send_context_free_inline) \
 intrinsic_macro(send_deferred) \
 intrinsic_macro(cancel_deferred) \
-intrinsic_macro(get_context_free_data) 
+intrinsic_macro(get_context_free_data) \
+intrinsic_macro(get_sender) 
 
 #define CREATE_ENUM(name) \
    name,