diff --git a/src/mint/taler-mint-httpd_deposit.c b/src/mint/taler-mint-httpd_deposit.c
index 6eeb3bff1..4a3713c5b 100644
--- a/src/mint/taler-mint-httpd_deposit.c
+++ b/src/mint/taler-mint-httpd_deposit.c
@@ -157,9 +157,7 @@ parse_and_handle_deposit_request (struct MHD_Connection *connection,
     if (GNUNET_NO == res)
       return MHD_YES; /* failure */
 
-    deposit->purpose.purpose = htonl (purpose);
-    deposit->purpose.size = htonl (sizeof (struct Deposit)
-                                   - offsetof (struct Deposit, purpose));
+    // deposit->purpose = htonl (purpose); // FIXME...
     res = verify_and_execute_deposit (connection,
                                       deposit);
     TALER_MINT_release_parsed_data (spec);
diff --git a/src/mint/taler-mint-httpd_keys.c b/src/mint/taler-mint-httpd_keys.c
index 24851575a..28924baef 100644
--- a/src/mint/taler-mint-httpd_keys.c
+++ b/src/mint/taler-mint-httpd_keys.c
@@ -357,7 +357,7 @@ TALER_MINT_get_denom_key (const struct MintKeyState *key_state,
   size_t buf_len;
 
   buf_len = GNUNET_CRYPTO_rsa_public_key_encode (denom_pub,
-                                                 *buf);
+                                                 &buf);
   GNUNET_CRYPTO_hash (buf,
                       buf_len,
                       &hash);
@@ -382,10 +382,15 @@ TALER_MINT_test_coin_valid (const struct MintKeyState *key_state,
                             struct TALER_CoinPublicInfo *coin_public_info)
 {
   struct TALER_MINT_DenomKeyIssuePriv *dki;
+  struct GNUNET_HashCode c_hash;
 
-  dki = TALER_MINT_get_denom_key (key_state, &coin_public_info->denom_pub);
+  dki = TALER_MINT_get_denom_key (key_state, coin_public_info->denom_pub);
   if (NULL == dki)
     return GNUNET_NO;
+  /* FIXME: we had envisioned a more complex scheme... */
+  GNUNET_CRYPTO_hash (&coin_public_info->coin_pub,
+                      sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey),
+                      &c_hash);
   if (GNUNET_OK !=
       GNUNET_CRYPTO_rsa_verify (&c_hash,
                                 coin_public_info->denom_sig,
diff --git a/src/mint/taler-mint-httpd_withdraw.c b/src/mint/taler-mint-httpd_withdraw.c
index 1cf410910..7b7066f80 100644
--- a/src/mint/taler-mint-httpd_withdraw.c
+++ b/src/mint/taler-mint-httpd_withdraw.c
@@ -98,7 +98,7 @@ TALER_MINT_handler_withdraw_sign (struct RequestHandler *rh,
   size_t denomination_pub_data_size;
   char *blinded_msg;
   size_t blinded_msg_len;
-  const struct GNUNET_CRYPTO_EddsaSignature signature;
+  struct GNUNET_CRYPTO_EddsaSignature signature;
 
   res = TALER_MINT_mhd_request_arg_data (connection,
                                          "reserve_pub",
@@ -112,7 +112,7 @@ TALER_MINT_handler_withdraw_sign (struct RequestHandler *rh,
   /* FIXME: handle variable-size signing keys! */
   res = TALER_MINT_mhd_request_var_arg_data (connection,
                                              "denom_pub",
-                                             &denomination_pub_data,
+                                             (void **) &denomination_pub_data,
                                              &denomination_pub_data_size);
   if (GNUNET_SYSERR == res)
     return MHD_NO; /* internal error */
@@ -120,7 +120,7 @@ TALER_MINT_handler_withdraw_sign (struct RequestHandler *rh,
     return MHD_YES; /* invalid request */
   res = TALER_MINT_mhd_request_var_arg_data (connection,
                                              "coin_ev",
-                                             &blinded_msg,
+                                             (void **) &blinded_msg,
                                              &blinded_msg_len);
   if (GNUNET_SYSERR == res)
     return MHD_NO; /* internal error */
@@ -137,7 +137,7 @@ TALER_MINT_handler_withdraw_sign (struct RequestHandler *rh,
 
   /* verify signature! */
   wsrd.purpose.size = htonl (sizeof (struct TALER_WithdrawRequest));
-  wsrd.purpose.type = htonl (TALER_SIGNATURE_WITHDRAW);
+  wsrd.purpose.purpose = htonl (TALER_SIGNATURE_WITHDRAW);
   GNUNET_CRYPTO_hash (denomination_pub_data,
                       denomination_pub_data_size,
                       &wsrd.h_denomination_pub);