diff --git a/fin_depo/defi_partisia_blockchain.py b/fin_depo/defi_partisia_blockchain.py
index effd28c..361df30 100644
--- a/fin_depo/defi_partisia_blockchain.py
+++ b/fin_depo/defi_partisia_blockchain.py
@@ -13,7 +13,14 @@ import fin_defs
 import requests
 from frozendict import frozendict
 
-from .data import DepoFetcher, DepoGroup, DepoSingle
+from .data import (
+    DepoFetcher,
+    DepoGroup,
+    DepoSingle,
+    DepositDetails,
+    DoubleRegister,
+    WithdrawalDetails,
+)
 
 logger = logging.getLogger(__name__)
 
@@ -179,3 +186,16 @@ class PartisiaBlockchainAccountDepoFetcher(DepoFetcher):
             balances.update_time,
             [depo_mpc, depo_byoc],
         )
+
+    def _get_withdrawals(self) -> list[WithdrawalDetails]:
+        raise UnsupportedOperationException("TODO")
+
+    def _get_deposits(self) -> list[DepositDetails]:
+        raise UnsupportedOperationException("TODO")
+
+    def _get_double_registers(self) -> list[DoubleRegister]:
+        double_registers: list[DoubleRegister] = []
+        double_registers += self._get_deposits()
+        double_registers += self._get_withdrawals()
+        double_registers.sort(key=lambda x: x.executed_time)
+        return double_registers