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<title>Glossary - Logos Blockchain Testing Framework Book</title>
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<ol class="chapter"><li class="chapter-item expanded "><a href="project-context-primer.html"><strong aria-hidden="true">1.</strong> Project Context Primer</a></li><li class="chapter-item expanded "><a href="what-you-will-learn.html"><strong aria-hidden="true">2.</strong> What You Will Learn</a></li><li class="chapter-item expanded "><a href="quickstart.html"><strong aria-hidden="true">3.</strong> Quickstart</a></li><li class="chapter-item expanded "><a href="part-i.html"><strong aria-hidden="true">4.</strong> Part I — Foundations</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="introduction.html"><strong aria-hidden="true">4.1.</strong> Introduction</a></li><li class="chapter-item expanded "><a href="architecture-overview.html"><strong aria-hidden="true">4.2.</strong> Architecture Overview</a></li><li class="chapter-item expanded "><a href="testing-philosophy.html"><strong aria-hidden="true">4.3.</strong> Testing Philosophy</a></li><li class="chapter-item expanded "><a href="scenario-lifecycle.html"><strong aria-hidden="true">4.4.</strong> Scenario Lifecycle</a></li><li class="chapter-item expanded "><a href="design-rationale.html"><strong aria-hidden="true">4.5.</strong> Design Rationale</a></li></ol></li><li class="chapter-item expanded "><a href="part-ii.html"><strong aria-hidden="true">5.</strong> Part II — User Guide</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="workspace-layout.html"><strong aria-hidden="true">5.1.</strong> Workspace Layout</a></li><li class="chapter-item expanded "><a href="annotated-tree.html"><strong aria-hidden="true">5.2.</strong> Annotated Tree</a></li><li class="chapter-item expanded "><a href="authoring-scenarios.html"><strong aria-hidden="true">5.3.</strong> Authoring Scenarios</a></li><li class="chapter-item expanded "><a href="workloads.html"><strong aria-hidden="true">5.4.</strong> Core Content: Workloads & Expectations</a></li><li class="chapter-item expanded "><a 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aria-hidden="true">5.12.</strong> Runners</a></li><li class="chapter-item expanded "><a href="node-control.html"><strong aria-hidden="true">5.13.</strong> RunContext: BlockFeed & Node Control</a></li><li class="chapter-item expanded "><a href="chaos.html"><strong aria-hidden="true">5.14.</strong> Chaos Workloads</a></li><li class="chapter-item expanded "><a href="topology-chaos.html"><strong aria-hidden="true">5.15.</strong> Topology & Chaos Patterns</a></li></ol></li><li class="chapter-item expanded "><a href="part-iii.html"><strong aria-hidden="true">6.</strong> Part III — Developer Reference</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="scenario-model.html"><strong aria-hidden="true">6.1.</strong> Scenario Model (Developer Level)</a></li><li class="chapter-item expanded "><a href="api-levels.html"><strong aria-hidden="true">6.2.</strong> API Levels: Builder DSL vs. Direct</a></li><li class="chapter-item expanded "><a href="extending.html"><strong 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class="active"><strong aria-hidden="true">8.4.</strong> Glossary</a></li></ol></li></ol>
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<h1 class="menu-title">Logos Blockchain Testing Framework Book</h1>
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<main>
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<h1 id="glossary"><a class="header" href="#glossary">Glossary</a></h1>
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<ul>
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<li><strong>Validator</strong>: node role responsible for participating in consensus and block
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production.</li>
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<li><strong>Executor</strong>: a validator node with the DA dispersal service enabled. Executors
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can submit transactions and disperse blob data to the DA network, in addition
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to performing all validator functions.</li>
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<li><strong>DA (Data Availability)</strong>: subsystem ensuring blobs or channel data are
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published and retrievable for validation.</li>
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<li><strong>Deployer</strong>: component that provisions infrastructure (spawns processes,
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creates containers, or launches pods), waits for readiness, and returns a
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Runner. Examples: LocalDeployer, ComposeDeployer, K8sDeployer.</li>
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<li><strong>Runner</strong>: component returned by deployers that orchestrates scenario
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execution—starts workloads, observes signals, evaluates expectations, and
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triggers cleanup.</li>
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<li><strong>Workload</strong>: traffic or behavior generator that exercises the system during a
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scenario run.</li>
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<li><strong>Expectation</strong>: post-run assertion that judges whether the system met the
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intended success criteria.</li>
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<li><strong>Topology</strong>: declarative description of the cluster shape, roles, and
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high-level parameters for a scenario.</li>
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<li><strong>Scenario</strong>: immutable plan combining topology, workloads, expectations, and
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run duration.</li>
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<li><strong>Blockfeed</strong>: stream of block observations used for liveness or inclusion
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signals during a run.</li>
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<li><strong>Control capability</strong>: the ability for a runner to start, stop, or restart
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nodes, used by chaos workloads.</li>
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<li><strong>Slot duration</strong>: time interval between consensus rounds in Cryptarchia. Blocks
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are produced at multiples of the slot duration based on lottery outcomes.</li>
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<li><strong>Block cadence</strong>: observed rate of block production in a live network, measured
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in blocks per second or seconds per block.</li>
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<li><strong>Cooldown</strong>: waiting period after a chaos action (e.g., node restart) before
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triggering the next action, allowing the system to stabilize.</li>
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<li><strong>Run window</strong>: total duration a scenario executes, specified via
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<code>with_run_duration()</code>. Framework auto-extends to at least 2× slot duration.</li>
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<li><strong>Readiness probe</strong>: health check performed by runners to ensure nodes are
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reachable and responsive before starting workloads. Prevents false negatives
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from premature traffic.</li>
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<li><strong>Liveness</strong>: property that the system continues making progress (producing
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blocks) under specified conditions. Contrasts with safety/correctness which
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verifies that state transitions are accurate.</li>
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<li><strong>State assertion</strong>: expectation that verifies specific values in the system
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state (e.g., wallet balances, UTXO sets) rather than just progress signals.
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Also called "correctness expectations."</li>
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<li><strong>Mantle transaction</strong>: transaction type in Logos that can contain UTXO transfers
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(LedgerTx) and operations (Op), including channel data (ChannelBlob).</li>
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<li><strong>Channel</strong>: logical grouping for DA blobs; each blob belongs to a channel and
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references a parent blob in the same channel, creating a chain of related data.</li>
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<li><strong>POL_PROOF_DEV_MODE</strong>: environment variable that disables expensive Groth16 zero-knowledge
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proof generation for leader election. <strong>Required for all runners</strong> (local, compose, k8s)
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for practical testing—without it, proof generation causes timeouts. Should never be
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used in production environments.</li>
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</ul>
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<hr />
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<h2 id="external-resources"><a class="header" href="#external-resources">External Resources</a></h2>
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<ul>
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<li><strong><a href="https://nomos-tech.notion.site/project">Logos Project Documentation</a></strong> — Protocol specifications, node internals, and architecture details</li>
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</ul>
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