Delta

Overview of the Delta hardfork, introducing span batches to reduce L1 data costs by compressing multiple L2 blocks into single batcher transactions.

Activation Timestamps

Network	Activation timestamp
mainnet	1708560000 (2024-02-22 00:00:00 UTC)
sepolia	1703203200 (2023-12-22 00:00:00 UTC)

The Delta upgrade uses a L2 block-timestamp activation-rule, and is specified only in the rollup-node (delta_time).

Consensus Layer

The Delta upgrade consists of a single consensus-layer feature: Span Batches.