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4 changes: 1 addition & 3 deletions specs/derivation.md
Original file line number Diff line number Diff line change
Expand Up @@ -285,9 +285,7 @@ As for the comment on "security types", it explains the classification of blocks

- [Unsafe L2 blocks][g-unsafe-l2-block]:
- [Safe L2 blocks][g-safe-l2-block]:
- Finalized L2 blocks: currently the same as the safe L2 block, but could be changed in the future to refer to block
that have been derived from [finalized][g-finalized-l2-head] L1 data, or alternatively, from L1 blacks that are older
than the [challenge period].
- Finalized L2 blocks: refer to block that have been derived from [finalized][g-finalized-l2-head] L1 data.

These security levels map to the `headBlockHash`, `safeBlockHash` and `finalizedBlockHash` values transmitted when
interacting with the [execution-engine API][exec-engine].
Expand Down