OP Labs announced that it will upgrade the OP Sepolia test network on March 19 and will support fully functional OP Stack failure proof. This upgrade will introduce some breaking changes that will affect cross-chain bridges, CEX, and custom solutions for using withdrawals. The team is asking relevant developers to update logic to support failure proofs, update withdrawal monitors, and update dispute monitors. The proposed fail-proof upgrade requires developers to update the withdrawal logic before OP Sepolia is released to enable these fail-proof changes. Importantly, withdrawals between OP Sepolia and Sepolia will no longer be instant as they will use a proof-of-failure mechanism.