diff --git a/eosio.unregd/abieos_numeric.hpp b/eosio.unregd/abieos_numeric.hpp
new file mode 100644
index 0000000..e82a8bc
--- /dev/null
+++ b/eosio.unregd/abieos_numeric.hpp
@@ -0,0 +1,84 @@
+// copyright defined in abieos/LICENSE.txt
+
+#include <algorithm>
+#include <array>
+#include <stdexcept>
+#include <stdint.h>
+#include <string>
+#include <string_view>
+//#include "ripemd160.hpp"
+
+namespace abieos {
+
+const char base58_chars[] = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
+
+bool map_initialized = false;
+std::array<int8_t, 256> base58_map{{0}};
+auto get_base58_map() {
+    if(!map_initialized) {
+      for (unsigned i = 0; i < base58_map.size(); ++i)
+          base58_map[i] = -1;
+      for (unsigned i = 0; i < sizeof(base58_chars); ++i)
+          base58_map[base58_chars[i]] = i;
+      map_initialized = true;
+    }
+    return base58_map;
+}
+
+template <size_t size>
+std::array<uint8_t, size> base58_to_binary(std::string_view s) {
+    std::array<uint8_t, size> result{{0}};
+    for (auto& src_digit : s) {
+        int carry = get_base58_map()[src_digit];
+        if (carry < 0)
+            eosio_assert(0, "invalid base-58 value");
+        for (auto& result_byte : result) {
+            int x = result_byte * 58 + carry;
+            result_byte = x;
+            carry = x >> 8;
+        }
+        if (carry)
+            eosio_assert(0, "base-58 value is out of range");
+    }
+    std::reverse(result.begin(), result.end());
+    return result;
+}
+
+enum class key_type : uint8_t {
+    k1 = 0,
+    r1 = 1,
+};
+
+struct public_key {
+    key_type type{};
+    std::array<char, 33> data{};
+};
+
+
+template <typename Key, int suffix_size>
+Key string_to_key(std::string_view s, key_type type, const char (&suffix)[suffix_size]) {
+    static const auto size = std::tuple_size<decltype(Key::data)>::value;
+    auto whole = base58_to_binary<size + 4>(s);
+    Key result{type};
+    memcpy(result.data.data(), whole.data(), result.data.size());
+    return result;
+}
+
+
+public_key string_to_public_key(std::string_view s) {
+    if (s.size() >= 3 && s.substr(0, 3) == "EOS") {
+        auto whole = base58_to_binary<37>(s.substr(3));
+        public_key key{key_type::k1};
+        static_assert(whole.size() == key.data.size() + 4, "Error: whole.size() != key.data.size() + 4");
+        memcpy(key.data.data(), whole.data(), key.data.size());
+        return key;
+    } else if (s.size() >= 7 && s.substr(0, 7) == "PUB_R1_") {
+        return string_to_key<public_key>(s.substr(7), key_type::r1, "R1");
+    } else {
+        eosio_assert(0, "unrecognized public key format");
+    }
+    return public_key{};
+}
+
+} // namespace abieos
+
diff --git a/eosio.unregd/eosio.unregd.abi b/eosio.unregd/eosio.unregd.abi
index 43b0a49..23ddbaa 100644
--- a/eosio.unregd/eosio.unregd.abi
+++ b/eosio.unregd/eosio.unregd.abi
@@ -1,5 +1,5 @@
 {
-  "____comment": "This file was generated by eosio-abigen. DO NOT EDIT - 2018-07-19T06:16:39",
+  "____comment": "This file was generated by eosio-abigen. DO NOT EDIT - 2018-08-28T10:54:52",
   "version": "eosio::abi/1.0",
   "types": [{
       "new_type_name": "ethereum_address",
@@ -42,7 +42,7 @@
           "type": "string"
         },{
           "name": "eos_pubkey",
-          "type": "public_key"
+          "type": "string"
         }
       ]
     }
diff --git a/eosio.unregd/eosio.unregd.cpp b/eosio.unregd/eosio.unregd.cpp
index 1e5ea3d..8041977 100644
--- a/eosio.unregd/eosio.unregd.cpp
+++ b/eosio.unregd/eosio.unregd.cpp
@@ -24,7 +24,7 @@ void unregd::add(const ethereum_address& ethereum_address, const asset& balance)
 /**
  * Register an EOS account using the stored information (address/balance) verifying an ETH signature
  */
-void unregd::regaccount(const bytes& signature, const string& account, const eosio::public_key& eos_pubkey) {
+void unregd::regaccount(const bytes& signature, const string& account, const string& eos_pubkey_str) {
 
   eosio_assert(signature.size() == 66, "Invalid signature");
   eosio_assert(account.size() == 12, "Invalid account length");
@@ -40,18 +40,29 @@ void unregd::regaccount(const bytes& signature, const string& account, const eos
   // Verify that the account does not exists
   eosio_assert(!is_account(naccount), "Account already exists");
 
-  // Calculate message hash based on current TX block num/prefix
-  char* message = (char*)malloc(64);
-  sprintf(message, "%u,%u", tapos_block_num(), tapos_block_prefix());
+  // Rebuild signed message based on current TX block num/prefix, pubkey and name
+  const abieos::public_key eos_pubkey = abieos::string_to_public_key(eos_pubkey_str);
 
-  checksum256 digest;
-  sha256(message, strlen(message), &digest);
+  char tmpmsg[128];
+  sprintf(tmpmsg, "%u,%u,%s,%s", tapos_block_num(), tapos_block_prefix(),
+    eos_pubkey_str.c_str(), account.c_str());
+
+  //Add prefix and length of signed message
+  char message[128];
+  sprintf(message, "%s%s%d%s", "\x19", "Ethereum Signed Message:\n", strlen(tmpmsg), tmpmsg);
+
+  //Calculate sha3 hash of message
+  sha3_ctx shactx;
+  checksum256 msghash;
+  rhash_keccak_256_init(&shactx);
+  rhash_keccak_update(&shactx, (const uint8_t*)message, strlen(message));
+  rhash_keccak_final(&shactx, msghash.hash);
 
   // Recover compressed pubkey from signature
-  uint8_t* pubkey = (uint8_t*)malloc(64);
-  uint8_t* compressed_pubkey = (uint8_t*)malloc(34);
+  uint8_t pubkey[64];
+  uint8_t compressed_pubkey[34];
   auto res = recover_key(
-    &digest,
+    &msghash,
     signature.data(),
     signature.size(),
     (char*)compressed_pubkey,
@@ -64,15 +75,13 @@ void unregd::regaccount(const bytes& signature, const string& account, const eos
   uECC_decompress(compressed_pubkey+1, pubkey, uECC_secp256k1());
 
   // Calculate ETH address based on decompressed pubkey
-  sha3_ctx* shactx = (sha3_ctx*)malloc(sizeof(sha3_ctx));
-
-  checksum256 msghash;
-  rhash_keccak_256_init(shactx);
-  rhash_keccak_update(shactx, pubkey, 64);
-  rhash_keccak_final(shactx, msghash.hash);
+  checksum256 pubkeyhash;
+  rhash_keccak_256_init(&shactx);
+  rhash_keccak_update(&shactx, pubkey, 64);
+  rhash_keccak_final(&shactx, pubkeyhash.hash);
 
-  uint8_t* eth_address = (uint8_t*)malloc(20);
-  memcpy(eth_address, msghash.hash + 12, 20);
+  uint8_t eth_address[20];
+  memcpy(eth_address, pubkeyhash.hash + 12, 20);
 
   // Verify that the ETH address exists in the "addresses" eosio.unregd contract table
   addresses_index addresses(_self, _self);
@@ -90,7 +99,9 @@ void unregd::regaccount(const bytes& signature, const string& account, const eos
   auto amount_to_purchase_8kb_of_RAM = buyrambytes(8*1024);
 
   // Build authority with the pubkey passed as parameter
-  auto auth = authority{1,{{eos_pubkey,1}},{},{}};
+  const auto auth = authority{
+    1, {{{(uint8_t)eos_pubkey.type, eos_pubkey.data} , 1}}, {}, {}
+  };
 
   // Issue to eosio.unregd the necesary EOS to buy 8K of RAM
   INLINE_ACTION_SENDER(call::token, issue)( N(eosio.token), {{N(eosio),N(active)}},
diff --git a/eosio.unregd/eosio.unregd.hpp b/eosio.unregd/eosio.unregd.hpp
index 0da5d05..0e35c38 100644
--- a/eosio.unregd/eosio.unregd.hpp
+++ b/eosio.unregd/eosio.unregd.hpp
@@ -15,6 +15,7 @@
 #include "sha3/byte_order.c"
 #include "sha3/sha3.c"
 
+#include "abieos_numeric.hpp"
 #define uECC_SUPPORTS_secp160r1 0
 #define uECC_SUPPORTS_secp192r1 0
 #define uECC_SUPPORTS_secp224r1 0
@@ -51,7 +52,7 @@ class unregd : public contract {
 
   // Actions
   void add(const ethereum_address& ethereum_address, const asset& balance);
-  void regaccount(const bytes& signature, const string& account, const eosio::public_key& eos_pubkey);
+  void regaccount(const bytes& signature, const string& account, const string& eos_pubkey);
 
  private:
   static uint8_t hex_char_to_uint(char character) {