Skip to content

docs: upgrade 18 #1121

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
roethke wants to merge 2 commits into
base: master
Choose a base branch
from
Open

docs: upgrade 18 #1121

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
33183c2
added fault proof diversity section, config changes for mainnet + sep…
roethke Feb 10, 2026
1229b1c
update date
roethke Feb 10, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 2 additions & 0 deletions docs/base-chain/network-information/configuration-changelog.mdx
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ This page tracks configuration changes to the Base networks, including updates t

| Date | Change | Documentation |
|------|--------|---------------|
| February 10, 2026 | Upgrade 18: Cannon + Kona fault proof support | [Fault Proof Diversity](/base-chain/network-information/transaction-finality#fault-proof-diversity) |
| February 4, 2026 | Increased EIP-1559 Denominator to 125 | [EIP-1559 Fee Parameters](/base-chain/network-information/network-fees#eip-1559-fee-parameters) |
| February 2, 2026 | Increased Minimum Base Fee to 2,000,000 wei | [Minimum Base Fee](/base-chain/network-information/network-fees#minimum-base-fee) |
| January 22, 2026 | Increased Minimum Base Fee to 1,000,000 wei | [Minimum Base Fee](/base-chain/network-information/network-fees#minimum-base-fee) |
Expand All @@ -26,6 +27,7 @@ This page tracks configuration changes to the Base networks, including updates t

| Date | Change | Documentation |
|------|--------|---------------|
| February 10, 2026 | Upgrade 18: Cannon + Kona fault proof support | [Fault Proof Diversity](/base-chain/network-information/transaction-finality#fault-proof-diversity) |
| November 20, 2025 | Enabled Minimum Base Fee (200,000 wei) | [Minimum Base Fee](/base-chain/network-information/network-fees#minimum-base-fee) |
| September 3, 2025 | Enabled Per-Transaction Gas Maximum | [Per-Transaction Gas Maximum](/base-chain/network-information/block-building#per-transaction-gas-maximum) |
| February 25, 2025 | Enabled Flashblocks | [Flashblocks](/base-chain/network-information/block-building#flashblocks) |
17 changes: 17 additions & 0 deletions docs/base-chain/network-information/transaction-finality.mdx
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -70,6 +70,23 @@ This system requires only a one honest party to remain secure. Base will always
Note: if the dispute game is won by a challenger, the state of the L2 chain does not reorg. The output proposal is marked invalid and any withdrawals that were proven against it cannot finalize. Those withdrawals would need to be re-proven against a different, valid output root.
</Accordion>

### Fault Proof Diversity

As part of [Upgrade 18], Base supports two independent fault proof implementations running in parallel:

| Game Type | Implementation | Description |
|-----------|----------------|-------------|
| `CANNON` (0) | op-program (Go) | Original fault proof using `op-node` + `op-geth` |
| `CANNON_KONA` (8) | kona-client (Rust) | Alternate fault proof using `kona-node` + `op-reth` |

Both implementations use Cannon as the Fault Proof Virtual Machine (FPVM) and share the same dispute game contract (`FaultDisputeGame.sol`). This diversity increases redundancy in the fault proof layer—if a bug affects one implementation, the other can still secure the network.

<Note>
Games of either type can be created after upgrade, but withdrawals continue to use the respected game type configured by governance.
</Note>

[Upgrade 18]: https://docs.optimism.io/notices/upgrade-18

## FAQ

<AccordionGroup>
Expand Down