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Consensus Team Update

· 3 min read
Damian Nadales
Damian Nadales
Consensus Team Lead

High level summary​

  • Leios prototype development (Treasury Funding Initiative 4: Ouroboros Leios Implementation):
    • Fixed an "impossible!" crash in the Leios prototype's fetch decision logic (#1996).
    • Added cumulative transaction bytes to the ledger state and exposed them as a Prometheus metric, giving operators a direct measure of throughput on the proto-devnet (#1988, cardano-node#6536).
    • Added a confirmed-transaction throughput panel to the proto-devnet dashboard (ouroboros-leios#859).
    • Hardened the prototype's test suite around endorser-block inclusion, making it easier to extend to upcoming features such as voting (#1971).
    • Started aligning the prototype with the original Leios design by migrating the endorser-block announcement and certification flag from the Ledger Block into the Praos Header (ouroboros-leios#837).
    • Investigating a performance bug observed during the March demo, where the time between forging and storing an endorser block can stretch to minutes and disrupt protocol operation (ouroboros-leios#844).
    • Nick Frisby shared a work-in-progress snapshot of his SQLite latency investigation from March, which informs Leios-related storage work (ouroboros-leios#863).
    • Posted the logbook update from the 2026-04-09 Consensus Office Hours (ouroboros-leios#854).
  • Peras protocol development (Treasury Funding Initiative 17: Maintenance and Support):
    • Defined sensible default values for PerasParams, simplifying configuration for downstream users (#1998).
  • Documentation (Treasury Funding Initiative 17: Maintenance and Support):
    • Added an explanation page describing the data flow between consensus components (#1955).
    • Published a first iteration of an explanation page covering the Ouroboros Praos consensus protocol (#1960).
    • Removed leftover documentation stubs and cleaned up the sidebar on the consensus website (#1956).
  • Releases and integration (Treasury Funding Initiative 17: Maintenance and Support):
    • Released ouroboros-consensus-3.0.1.0 (#1987).
    • Bumped the node's consensus dependency to 3.0.1, propagating recent consensus improvements to cardano-node (cardano-node#6533).
    • Re-landed the rework of snapshotFromIS, part of ongoing improvements to ledger snapshotting (#1992).