Draft U16 notice page

[bradleycamacho]

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[coderabbitai[bot]]

📝 Walkthrough

Walkthrough

A new upgrade notice for "Upgrade 16" has been introduced, describing protocol changes for the OP Stack, including interoperability-ready smart contracts, updates to core contracts, and operational instructions for chain operators, users, and bridges. The notice details technical updates such as contract modifications, increased gas limits, and security reviews. The metadata for this notice was added to the notices JSON file. The word list was updated by removing "custom-bridge," adding "extensibly," and reordering "Devnets" and "devnet."

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant Bridge
    participant ChainOperator
    participant OPStackContracts
    participant DisputeGameFactory

    User->>Bridge: Initiate withdrawal
    Bridge->>OPStackContracts: Submit withdrawal transaction
    Note over OPStackContracts: Before Upgrade 16<br/>Withdrawal proofs are valid
    ChainOperator->>OPStackContracts: Activate Upgrade 16
    Note over OPStackContracts: All existing withdrawal proofs invalidated
    User->>Bridge: Attempt to finalize withdrawal
    Bridge->>OPStackContracts: Re-prove withdrawal (if not finalized before upgrade)
    OPStackContracts->>DisputeGameFactory: Use new proveWithdrawalTransaction variant
    DisputeGameFactory-->>OPStackContracts: Confirm or dispute withdrawal

Possibly related PRs

• ethereum-optimism/docs#1491: Adds a notice page for Upgrade 15 with similar structure and metadata updates in the notices directory, related by purpose and content type.
• ethereum-optimism/docs#1522: Adds an Upgrade 16 notice with withdrawal reproving instructions, conceptually related to Upgrade 13 notice updates involving withdrawal reproving and upgrade warnings.
• ethereum-optimism/docs#1444: Documents op-contracts v1.8.0 release with contract version updates including SystemConfig and OptimismPortal, related to the Upgrade 16 contract changes and versioning.

Suggested reviewers

• bradleycamacho

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