> ## Documentation Index
> Fetch the complete documentation index at: https://docs.optimism.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Canyon

> Hardfork registry entry for the Canyon network upgrade, which brought L1's Shapella upgrade to the OP Stack.

<Info>
  **Normative spec:** the [Canyon specification](https://specs.optimism.io/protocol/canyon/overview.html)
  is the canonical definition of this upgrade. This page records activation data
  and operational pointers; it does not restate the spec.
</Info>

Canyon brought Ethereum's Shapella upgrade to the OP Stack along with minor
protocol fixes.

|                                         |                                                                                            |
| --------------------------------------- | ------------------------------------------------------------------------------------------ |
| Status                                  | Active                                                                                     |
| Governing spec                          | [specs.optimism.io](https://specs.optimism.io/protocol/canyon/overview.html)               |
| Governance approval                     | [proposal](https://gov.optimism.io/t/final-upgrade-proposal-2-canyon-network-upgrade/7088) |
| Mainnet activation (superchain default) | Thu, 11 Jan 2024 17:00:01 UTC (`1704992401`)                                               |
| Sepolia activation (superchain default) | Tue, 14 Nov 2023 17:00:00 UTC (`1699981200`)                                               |

## What changed

Per the [spec overview](https://specs.optimism.io/protocol/canyon/overview.html):

* Shapella EIPs on L2: [EIP-3651](https://eips.ethereum.org/EIPS/eip-3651)
  (warm COINBASE), [EIP-3855](https://eips.ethereum.org/EIPS/eip-3855)
  (`PUSH0`), [EIP-3860](https://eips.ethereum.org/EIPS/eip-3860) (limit and
  meter initcode), [EIP-4895](https://eips.ethereum.org/EIPS/eip-4895)
  (withdrawals operations, set to the empty array on L2), and
  [EIP-6049](https://eips.ethereum.org/EIPS/eip-6049) (deprecate
  `SELFDESTRUCT`).
* Modified the EIP-1559 denominator.
* Added the deposit nonce and deposit nonce version to the deposit receipt
  hash.
* Deployed the `create2Deployer` predeploy at
  `0x13b0D85CcB8bf860b6b79AF3029fCA081AE9beF2`.
* Consensus layer: channel ordering fix.