diff --git a/src/main.rs b/src/main.rs
index cb756ea..59d3daa 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -64,11 +64,12 @@ async fn main() -> Result<()> {
     let (_plan, prepared) = prepare_and_build(txu, &adapters, &kp_pub)?;
 
     // 2) Blockhash fresco + slot
-    let (new_bh, ctx_slot) = rpc.get_latest_blockhash().await?;
+    let (latest_blockhash, ctx_slot) = rpc.get_latest_blockhash().await?;
+    println!("latest_blockhash: {latest_blockhash}");   //si borro esto parece q no refresba bien latest_blockhash
     println!("Latest slot solana: {ctx_slot}");
 
     // 3) Actualiza blockhash del mensaje
-    let vm = set_recent_blockhash(prepared.message, new_bh);
+    let vm = set_recent_blockhash(prepared.message, latest_blockhash);
 
     // 4) Firma con tu keypair
     let vtx = sign_versioned_tx(vm, &[&kp])?;
@@ -81,7 +82,7 @@ async fn main() -> Result<()> {
 
 
     // 6) Enviar
-    let sig = rpc.send_transaction(&vtx, Some(ctx_slot)).await?;
+    let sig = rpc.send_transaction(&vtx, None).await?;
     println!("🚀 Enviada: {}", sig);
 
 
diff --git a/src/rpc.rs b/src/rpc.rs
index 06080e1..e4da1f8 100644
--- a/src/rpc.rs
+++ b/src/rpc.rs
@@ -93,13 +93,11 @@ struct GetLatestBlockhashValue {
 }
 
 #[derive(Serialize)]
+#[serde(rename_all = "camelCase")]
 struct SimSendConfig<'a> {
     encoding: &'a str,                 // "base64"
-    #[serde(rename = "sigVerify")]
-    sig_verify: bool,                  // false
-    #[serde(rename = "replaceRecentBlockhash")]
-    replace_recent_blockhash: bool,    // true/false
-    #[serde(rename = "commitment")]
+    sig_verify: bool,
+    replace_recent_blockhash: bool,    // false
     commitment: &'a str,
 
     #[serde(skip_serializing_if = "Option::is_none")]
@@ -107,7 +105,7 @@ struct SimSendConfig<'a> {
     #[serde(skip_serializing_if = "Option::is_none")]
     skip_preflight: Option<bool>,
 
-    #[serde(skip_serializing_if = "Option::is_none", rename = "minContextSlot")]
+    #[serde(skip_serializing_if = "Option::is_none")]
     min_context_slot: Option<u64>,
 }
 
@@ -158,7 +156,7 @@ impl Rpc for HttpRpc {
             replace_recent_blockhash: false,      // usa el mismo blockhash que envías
             commitment: &self.commitment,
             preflight_commitment: Some(&self.commitment),
-            skip_preflight: None,
+            skip_preflight: Some(true),
             min_context_slot,
         };
 
@@ -169,6 +167,7 @@ impl Rpc for HttpRpc {
             params: Some(vec![serde_json::json!(tx_b64), serde_json::to_value(cfg)?]),
         };
 
+
         let resp: RpcResponse<serde_json::Value> = self
             .client
             .post(&self.url)
@@ -193,9 +192,9 @@ impl Rpc for HttpRpc {
             sig_verify: false,
             replace_recent_blockhash: false,
             commitment: &self.commitment,
-            preflight_commitment: Some(&self.commitment),
-            skip_preflight: Some(false),
-            min_context_slot,                     // 👈 importante
+            preflight_commitment: None,
+            skip_preflight: Some(true),
+            min_context_slot: None
         };
 
         let req = RpcRequest {