Merge pull request #739 from tellor-io/btc-bal2

Btc bal2

src/telliot_feeds/sources/btc_balance.py

@@ -76,6 +76,11 @@ async def get_response(self) -> Optional[Any]:
                 logger.info("No transactions for this address")
                 return 0
 
+            for tx in data["txs"]:
+                if not tx.get("block_height") or not isinstance(tx["block_height"], int):
+                    logger.error("Invalid transaction found: missing or non-integer block_height")
+                    return None
+
             # Sort transactions by time in ascending order
             sorted_txs = sorted(data["txs"], key=lambda tx: (tx["block_height"], tx["tx_index"]))