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Normative spec: the Delta specification is the canonical definition of this upgrade. This page records activation data and operational pointers; it does not restate the spec.
Delta consisted of a single consensus-layer feature: span batches, which reduce the fixed per-block overhead of batch submission.

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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.