diff --git a/tests/test_chat_sync_stress.c b/tests/test_chat_sync_stress.c
index c8f759fc..ae1252b5 100644
--- a/tests/test_chat_sync_stress.c
+++ b/tests/test_chat_sync_stress.c
@@ -143,12 +143,10 @@ static void seed_members(struct UTUN_INSTANCE* self, struct UTUN_INSTANCE* peer)
 
 static int insert_record(struct DB_SYNC_INSTANCE* si, struct UTUN_INSTANCE* inst, const char* data, size_t len) {
     uint64_t ts = db_sync_next_timestamp(si);
-    uint8_t sig_msg[4096]; size_t off = 0;
-    memcpy(sig_msg + off, &ts, 8);  off += 8;
-    memcpy(sig_msg + off, data, len); off += len;
-    uint8_t sig[64];
-    if (sc_ed25519_sign(inst->my_ed25519_privkey, sig_msg, off, sig) != SC_OK) return -1;
-    return db_sync_insert_signed(si, data, len, sig, 64, ts, NULL);
+    uint8_t sig[64]; struct db_message_revision revision = {.nonce = {1}, .ver = 1};
+    if (db_sync_sign_message(db_sync_instance_group_id(si), ts, inst->node_id, &revision, data, len,
+        inst->my_ed25519_privkey, sig) < 0) return -1;
+    return db_sync_insert_signed(si, data, len, sig, 64, ts, NULL, &revision);
 }
 
 int main(void) {
diff --git a/tests/test_media_delivery_chat.c b/tests/test_media_delivery_chat.c
index 1faef247..3649120e 100644
--- a/tests/test_media_delivery_chat.c
+++ b/tests/test_media_delivery_chat.c
@@ -382,14 +382,12 @@ static int author_publish_message(void) {
 
     uint64_t ts = db_sync_next_timestamp(g_si[I_N1]);
     size_t jl = strlen(json);
-    uint8_t sig_msg[8700]; size_t soff = 0;
-    memcpy(sig_msg + soff, &ts, 8); soff += 8;
-    memcpy(sig_msg + soff, json, jl); soff += jl;
-    uint8_t sig[64];
-    if (sc_ed25519_sign(g_inst[I_N1]->my_ed25519_privkey, sig_msg, soff, sig) != SC_OK) return -1;
+    uint8_t sig[64]; struct db_message_revision revision = {.nonce = {1}, .ver = 1};
+    if (db_sync_sign_message(db_sync_instance_group_id(g_si[I_N1]), ts, g_nid[I_N1], &revision, json, jl,
+        g_inst[I_N1]->my_ed25519_privkey, sig) < 0) return -1;
 
     DEBUG_INFO(DEBUG_CATEGORY_GENERAL, "[mdc] publish media message ts=%llu len=%zu", (unsigned long long)ts, jl);
-    int rc = db_sync_insert_signed(g_si[I_N1], json, jl, sig, 64, ts, NULL);
+    int rc = db_sync_insert_signed(g_si[I_N1], json, jl, sig, 64, ts, NULL, &revision);
     if (rc == 0) {
         /* анонсируем блоки суперузлам (как on_media_registered в chat_msg.c) */
         ensure_supernode_type(I_N1);