Delta

Hardfork registry entry for the Delta network upgrade, which introduced span batches.

Delta consisted of a single consensus-layer feature: span batches, which reduce the fixed per-block overhead of batch submission.

Status	Active
Governing spec	specs.optimism.io
Governance approval	proposal
Mainnet activation (superchain default)	Thu, 22 Feb 2024 00:00:00 UTC (1708560000)
Sepolia activation (superchain default)	Fri, 22 Dec 2023 00:00:00 UTC (1703203200)

What changed

Per the spec overview:

• Consensus layer: span batches. Delta is specified only in the rollup node (delta_time); it required no execution-engine change.