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Orbitra L1 · Consensus layer

The layer where one truth is agreed.

QSE sits at the consensus layer of Orbitra L1. Everything above it — VectorLanes execution, ApexMatch fills, NexusWASM contracts — becomes final only when a QSE quorum signs the same transition.

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Illustration: Orbitra L1 as six stacked layers: experience at the top, then market services, execution, consensus, data and network at the base. Light travels down through the layers as a transaction is executed and finalized, and back up as confirmed state.
  1. 01ExperienceOrbitra Prime · wallets · apps · institutional APIs
  2. 02Market servicesApexMatch · Aegis · Prism · clearing · settlement
  3. 03ExecutionVectorLanes · deterministic scheduler · NexusWASM
  4. 04ConsensusQSE quorum · finality certificates · validator policy
  5. 05DataState commitments · history · index streams · proofs
  6. 06NetworkRegional ingress · encrypted transport · availability mesh

Layer · Consensus

Role in the Orbitra L1 stack

Execution produces candidate state; consensus decides which state is true. VectorLanes runs independent work in parallel, then hands QSE an ordered set of transitions to certify.

QSE is a HotStuff-family BFT protocol. A configured Byzantine quorum of validators signs the same state transition, producing a finality certificate. There is no probabilistic confirmation ladder and no reorganization after finality under the stated fault model.

Illustration: Three forces — stake, authority and verified work — shape a validator set. Validators vote on the same state transition; once a configured Byzantine quorum has signed, their signatures form a quorum certificate and one state is finalized.
  1. StakeEconomic security and slashing exposure
  2. AuthorityProposer and committee duties
  3. WorkVerified availability, validation and service

Validator votes

Quorum certificate

Finalized state

7 / 10

What QSE contributes to the network

  • 01

    Economic security

    Stake selects the security set and creates slashing exposure for provable misbehavior.

  • 02

    Clear duties

    Authority assigns proposer and committee roles, so responsibility for each step is explicit.

  • 03

    Measured service

    Verified work — availability, validation, service quality — shapes duties and rewards.

  • 04

    Deterministic finality

    Applications and markets can treat a certified transition as settled, without waiting for depth.

Canonical technology pageFull technical depthThe canonical QSE page covers the quorum rule, validator policy, fault model, finality certificates and specifications.Explore QSE

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