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Normative spec: the Fjord specification is the canonical definition of this upgrade. This page records activation data and operational pointers; it does not restate the spec.
Fjord improved fee estimation and batch compression, and added the secp256r1 precompile.

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What changed

Per the spec overview:
  • Execution layer: RIP-7212 precompile for secp256r1 curve support; FastLZ compression for L1 data fee calculation; deprecated the getL1GasUsed method on the GasPriceOracle predeploy and the L1GasUsed receipt field.
  • Consensus layer: constant maximum sequencer drift; Brotli channel compression; increased max bytes per channel and max channel bank size.