diff --git a/libraries/app/api.cpp b/libraries/app/api.cpp
index f262cca7..0d07ef2c 100644
--- a/libraries/app/api.cpp
+++ b/libraries/app/api.cpp
@@ -464,6 +464,11 @@ namespace graphene { namespace app {
     {
        return fc::ecc::range_proof_sign( min_value, commit, commit_blind, nonce, base10_exp, min_bits, actual_value );
     }
+    
+    fc::ecc::public_key crypto_api::child(fc::ecc::public_key public_key, fc::sha256 child)
+    {
+        return  public_key_type( public_key.child( child ) );
+    }
                                
     verify_range_proof_rewind_result crypto_api::verify_range_proof_rewind( const blind_factor_type& nonce,
                                                                             const commitment_type& commit, 
diff --git a/libraries/app/include/graphene/app/api.hpp b/libraries/app/include/graphene/app/api.hpp
index a6ffe0e9..ebca000f 100644
--- a/libraries/app/include/graphene/app/api.hpp
+++ b/libraries/app/include/graphene/app/api.hpp
@@ -222,6 +222,7 @@ namespace graphene { namespace app {
                                              uint8_t min_bits,
                                              uint64_t actual_value );
                                        
+         fc::ecc::public_key child(fc::ecc::public_key public_key, fc::sha256 child);
          
          verify_range_proof_rewind_result verify_range_proof_rewind( const blind_factor_type& nonce,
                                                                      const fc::ecc::commitment_type& commit, 
@@ -313,6 +314,7 @@ FC_API(graphene::app::crypto_api,
        (verify_sum)
        (verify_range)
        (range_proof_sign)
+       (child)
        (verify_range_proof_rewind)
        (range_get_info)
      )