Skip to main content
Normative spec: the Regolith specification is the canonical definition of this upgrade. This page records activation data and operational pointers; it does not restate the spec.
Regolith made minor corrections to deposit processing based on audit findings after Bedrock. It activates at timestamp 0 on OP Mainnet and OP Sepolia — that is, from the Bedrock migration onward — which predates the superchain-registry’s superchain-wide hardfork defaults.

​
What changed

Per the spec overview:
  • Disabled the isSystemTx boolean; system transactions use the same gas accounting rules as regular deposits.
  • Records actual deposit gas usage in the deposit transaction receipt and subtracts it from the L2 block gas pool (unused deposit gas is not refunded).
  • Adds the optional depositNonce receipt field and uses it to correct transaction and receipt metadata in RPC responses.
  • Commits gas and depositNonce into the consensus representation of the receipt so the data syncs safely between L2 nodes.
  • Corrects the L1 cost function to more closely match pre-Bedrock behavior.