Upgrade 16a Protocol upgrade

Notice date: November 10, 2025

Target Network: GIWA Testnet (Sepolia)

Overview

GIWA Chain will apply the Upgrade 16a protocol update from the OP Stack. This is a maintenance release that includes internal improvements to enhance system stability.

Any withdrawals that have not been finalized before the upgrade will need to be reproven after the upgrade.

Schedule

• Testnet (Sepolia): November 12, 2025

The actual time may vary depending on network conditions and block timing.

For Users

• If a withdrawal to L1 is not yet finalized when the upgrade is executed, the corresponding withdrawal proof will be invalidated. In that case, you will need to resubmit the withdrawal proof after the upgrade completes.

• Withdrawals that are already finalized will not be affected.

• All assets (ETH and tokens) remain safe, and there is no risk of loss.

For Developers

• Applications related to bridge withdrawals (e.g., withdrawal status trackers, bridge UIs, etc.) should account for possible temporary withdrawal proof invalidation during the upgrade window.

• If your app monitors withdrawal proofs on L1, make sure it can detect invalidated proofs and retry accordingly.

• No changes are required for smart contracts already deployed on the GIWA network.

Learn more

Want to learn more about Upgrade 16a? Check out the OP Stack documentation.