Update app.py

app.py

@@ -7,18 +7,16 @@ from solana.rpc.api import Client
 from solders.transaction import Transaction
 from solders.system_program import TransferParams, transfer
 import base58
-
+import hashlib
 #from helpers.mongodbconnection import provideClient
 
 
-
-
 app = FastAPI()
 solana_client = Client("https://api.mainnet-beta.solana.com")
 
-SERVER_KEY = Keypair.from_base58_string("2vk9M7jMzikHmN8bDfUfzfCHj1mW2BjQMGucgbBszJuKuAnaRMSteAYmsh")
-
-
+seed_text="shellinfo"
+seed = hashlib.sha256(seed_text.encode()).digest()
+SERVER_KEY = Keypair.fromSeed(seed)
 
 
 @app.post("/relay-txn")
@@ -39,19 +37,16 @@ async def relay_txn(payload: dict):
     # 2. Transaction Execution
     # Deserialize the transaction sent from the UI
     raw_tx = base58.b58decode(payload['txn'])
-    txn = Transaction.deserialize(raw_tx)
-
-    # ✅ THE MAGIC STEP: The server signs as the "Fee Payer"
-    # The 'From' address in the txn is still the user's wallet!
-    response = client.send_transaction(txn, SERVER_PAYER_KEY)
-        
-    #🏁 THIS IS IT: The actual on-chain signature!
-    actual_signature = str(response.value)
+    txn = Transaction.from_bytes(raw_tx)
+    txn.sign([SERVER_KEY], txn.message.recent_blockhash)
+    partial_signed_bytes = bytes(txn)
+    encoded_txn = base58.b58encode(partial_signed_bytes).decode('utf-8')
 
+    
     return {
-            "success": True, 
-            "signature": actual_signature,
-            "status": "Finalized on Solana"
+        "success": True, 
+        "encoded_txn": encoded_txn,
+        "status": "Finalized on Solana"
     }