E0 · Submission-path landing probe (non-trading transactions)

{
  "protocol_id": "E0-landing-probe",
  "version": 1,
  "experiment": "E0",
  "status": "draft",
  "title": "E0 · Submission-path landing probe (non-trading transactions)",
  "hypothesis": "Rout's submission path lands non-contended transactions within the window at least as often as a public reference RPC, and never double-executes. Primary question: does durable nonce help or hurt landing? A sender's own docs say builders may deprioritize durable-nonce transactions as spam-associated ('a durable nonce can hurt landing on some paths'), so nonce vs blockhash is the primary comparison.",
  "customer_value": "Shows whether Rout's provider fan-out and nonce handling add anything before any money is at risk on a token.",
  "unit": "One probe intent = one self-transfer of a random lamport amount from a rotating wallet that also carries real traffic; no memo (providers must not be able to recognise probes). Copies per provider share the intent.",
  "arms": [
    {
      "arm_id": "rout_nonce",
      "description": "Rout submission path, durable nonce, one signed copy per provider."
    },
    {
      "arm_id": "rout_blockhash",
      "description": "Rout submission path, recent blockhash."
    },
    {
      "arm_id": "reference_rpc",
      "description": "Same transaction shape via sendTransaction on an independent public RPC."
    }
  ],
  "primary_metric": {
    "id": "landed_within_window",
    "definition": "Share of all intents in the arm whose first landed_ok copy has slot - anchor.slot <= landing_window_slots. anchor = the scheduled slot (anchor.kind = probe_slot) at which the intent had to be created."
  },
  "secondary_metrics": [
    {
      "id": "delta_slot_quantiles",
      "definition": "Δslot quantiles over landed intents with order-statistic CIs."
    },
    {
      "id": "double_landed_nonce_intents",
      "definition": "Nonce intents with more than one landed copy. Must be 0."
    },
    {
      "id": "provider_win_share",
      "definition": "Within multi-copy intents, which provider's copy landed."
    },
    {
      "id": "spend_per_landed",
      "definition": "(chain-observed fees + engine-reported tips on landed copies) / landed intents."
    }
  ],
  "parameters": {
    "confidence": 0.95,
    "quantiles": [
      0.5,
      0.9,
      0.95,
      0.99
    ],
    "bootstrap_resamples": null,
    "landing_window_slots": null,
    "commitment": "finalized",
    "max_abs_clock_offset_ns": null,
    "target_n_per_arm": null,
    "budget_lamports_max": null,
    "tip_lamports_by_arm": null,
    "comparisons": [
      [
        "rout_nonce",
        "rout_blockhash"
      ],
      [
        "rout_nonce",
        "reference_rpc"
      ],
      [
        "rout_blockhash",
        "reference_rpc"
      ]
    ],
    "strata": [
      "congestion_tercile",
      "leader_window_position",
      "region"
    ],
    "cluster_slots": null,
    "schedule_modulus": null
  },
  "randomization": {
    "unit": "intent",
    "method_id": "sha256_mod_v1",
    "method": "Arm = arms[sha256(run_id:seq) mod 3] (rbench.assign). Intents are created only at scheduled slots: sha256(run_id:slot:s) mod schedule_modulus == 0 within manifest.schedule, so the engine cannot pick favourable moments; the verifier recomputes both.",
    "strata": [
      "congestion_tercile",
      "leader_window_position",
      "region"
    ]
  },
  "denominator": "Every intent created in the run, whatever its engine_outcome.",
  "exclusions": [
    "None after the fact. A run is voided entirely (and published as voided) if integrity checks fail.",
    "Tips below a provider's minimum are not allowed by protocol: providers silently drop them, which would look like slow landing. tip_lamports_by_arm must meet every provider's documented minimum."
  ],
  "stopping_rule": "Fixed n = target_n_per_arm; single analysis.",
  "acceptance": {
    "max_double_landed_nonce_intents": 0,
    "min_landing_difference_vs_reference": null
  },
  "redact_by_tier": {
    "partner_confidential": [
      "host_id",
      "nonce_account",
      "stratum"
    ],
    "public": [
      "mint",
      "size_raw",
      "quote",
      "endpoint_region",
      "refusal_code",
      "send_error"
    ]
  },
  "requires": [
    "E0",
    "E1",
    "E2",
    "E3",
    "E4",
    "BUDGET-E0"
  ]
}