Isthmus hardfork

This page outlines breaking changes related to the Isthmus network upgrade for chain operators and node operators.

info

The Isthmus hardfork activation has not been scheduled yet. This page will be updated accordingly.

What's included in Isthmus

Isthmus contains these main changes:

• Implement Prague features on the OP Stack: This includes the EIPs that are relevant to the L2 that are being added to Ethereum with its Pectra activation. Learn more about this here.

  Notable EIP's included:

  • EIP-7702: Set code transaction
  • EIP-2537: BLS12-381 precompiles
  • EIP-2935: Block hashes contract predeploy
  • EIP-7623: Increase calldata cost

• L2 Withdrawals Root in Block Header: This lowers the lift for chain operators by allowing them to run a full node to operate op-dispute-mon making it easier to guarantee the security of the fault proofs for the chains in the Superchain as the number of chains scales. Learn more about this here.

For more information on the Isthmus implementation details, please review Isthmus specification.