Add extra optional withdrawals to prefund EOAs

eest_stateful_generator.py

@@ -1198,6 +1198,25 @@ def preparation_getpayload(
             "amount": hex((1 << 64) - 1),
         }]
 
+    sender_addresses_path = Path("sender_addresses.txt")
+    if sender_addresses_path.exists():
+        sender_lines = [
+            ln.strip()
+            for ln in sender_addresses_path.read_text(encoding="utf-8").splitlines()
+            if ln.strip()
+        ]
+        next_index = len(withdrawals) + 2
+        next_validator = len(withdrawals) + 1
+        for addr in sender_lines:
+            withdrawals.append({
+                "index": hex(next_index),
+                "validatorIndex": hex(next_validator),
+                "address": addr,
+                "amount": hex((1 << 64) - 1),
+            })
+            next_index += 1
+            next_validator += 1
+
     payload_attributes = {
         "timestamp": hex(new_ts),
         "prevRandao": parent_hash,