Weekly Engineering Update: zend_oo: Ceased Sidechain Withdrawals final review complete. Mainchain Backward Transfer Request final review complete. Customizable certificate fields final code review scheduled. Keep track of cumulative SCBlockTxCommTree final code review has been scheduled. Bitvector implementation ongoing. Zend: zend 2.0.23 release tasks identified and scheduled. Proving System: Batched verification of dlog hard parts code reviews ongoing. Marlin import and overwork segmentation ongoing. Multi-point multi-poly batching final code review scheduled. SDK: Base fee scheme design, implementation and code reviews completed. Development of multiple certificates processing for different qualities design and implementation completed. Keep track of cumulative sidechain block transaction commitment tree design and implementation ongoing.