diff --git a/gateway/src/ocr/extract.ts b/gateway/src/ocr/extract.ts
index 43b5b35..c613695 100644
--- a/gateway/src/ocr/extract.ts
+++ b/gateway/src/ocr/extract.ts
@@ -42,7 +42,7 @@ import type { GatewayDeps } from "../deps.js";
 import type { GatewayStore } from "../db/store.js";
 import { requireKey } from "../middleware/apiKeyAuth.js";
 import { asyncHandler } from "../middleware/http.js";
-import { selectCandidates } from "../routing/selectSupplier.js";
+import { selectCandidates, type SupplierCandidate } from "../routing/selectSupplier.js";
 import { preflight } from "../onchain/preflight.js";
 import { resolveSubmittedRef, acceptAndConfirm } from "../onchain/settle.js";
 import { ensureWalletHealthy } from "../walletHealth.js";
@@ -107,8 +107,12 @@ function parseOcrRequest(body: unknown): ParsedOcrRequest {
   return { image_b64: image, mime, output_format: rawFormat, model };
 }
 
-/** Sanitized venue-attribution headers. Invalid values drop to "". */
-function venueAttribution(req: Request): { venue: string; runUserHash: string } {
+/** Sanitized venue-attribution headers. Invalid values drop to "".
+ * Exported for direct unit testing (I3 review finding) — it is the only
+ * gate on what lands in the ocr_settled/ocr_failed structured log lines the
+ * wedge-ledger emitter reads, so it needs coverage independent of the HTTP
+ * route. */
+export function venueAttribution(req: Request): { venue: string; runUserHash: string } {
   const venueRaw = req.header("X-Venue") ?? "";
   const hashRaw = req.header("X-Run-User-Hash") ?? "";
   return {
@@ -173,6 +177,16 @@ async function runOcrOneShot(
   const { config, store, chain, fetchFn } = deps;
   const capabilityId = config.ocrCapabilityId;
 
+  // Hoisted above the try so the catch block can report whatever is known
+  // even when the failure happens AFTER an escrow was posted (e.g. the
+  // supplier call or settle step fails) — these fields are the
+  // reconciliation spine that joins on-chain settlement to platform
+  // billing, and losing them makes paid-but-failed jobs unreconcilable
+  // (I2 review finding).
+  let result: Awaited<ReturnType<typeof ctx.sdk.submitOcr>> | undefined;
+  let used: SupplierCandidate | undefined;
+  let escrowRefStr: string | null = null;
+
   try {
     const candidates = await selectCandidates({
       indexerUrl: config.indexerUrl,
@@ -210,8 +224,6 @@ async function runOcrOneShot(
     // Submit. Fall back to the next supplier ONLY on a pre-post
     // TxConstructionError (no escrow was posted). A SupplierError means the
     // escrow is already posted — do not retry (the sweeper recovers it).
-    let result: Awaited<ReturnType<typeof ctx.sdk.submitOcr>> | undefined;
-    let used: (typeof candidates)[number] | undefined;
     let lastErr: unknown;
     for (const cand of candidates) {
       try {
@@ -235,11 +247,11 @@ async function runOcrOneShot(
     }
 
     // Settle: resolve the live Submitted ref, Accept, await confirmation.
-    const originalRefStr = `${result.escrowRef.txHash}#${result.escrowRef.index}`;
+    escrowRefStr = `${result.escrowRef.txHash}#${result.escrowRef.index}`;
     const submittedRef = await resolveSubmittedRef({
       indexerUrl: config.indexerUrl,
       buyerPkh: ctx.walletKey.pubKeyHash,
-      originalRefStr,
+      originalRefStr: escrowRefStr,
       fetchFn,
     });
     await acceptAndConfirm(chain, ctx.walletKey, submittedRef);
@@ -249,7 +261,7 @@ async function runOcrOneShot(
       capabilityId,
       model: used.model,
       supplierPkh: used.supplierPkh,
-      escrowRef: originalRefStr,
+      escrowRef: escrowRefStr,
       costLovelace: used.priceLovelace,
       promptTokens: result.usage.prompt_tokens,
       completionTokens: result.usage.completion_tokens,
@@ -261,7 +273,7 @@ async function runOcrOneShot(
     // caller sent none.
     console.log(JSON.stringify({
       evt: "ocr_settled",
-      escrow_ref: originalRefStr,
+      escrow_ref: escrowRefStr,
       capability_id: capabilityId,
       model: used.model,
       supplier_pkh: used.supplierPkh,
@@ -286,7 +298,7 @@ async function runOcrOneShot(
       x_vector: {
         receipt: result.receipt,
         receipt_signature: result.receiptSignature,
-        escrow_ref: originalRefStr,
+        escrow_ref: escrowRefStr,
         receipt_labels: RECEIPT_LABELS_V0,
       },
     });
@@ -294,15 +306,33 @@ async function runOcrOneShot(
     recordOcrUsage(store, {
       keyId,
       capabilityId,
-      model: parsed.model,
-      supplierPkh: null,
-      escrowRef: null,
-      costLovelace: null,
-      promptTokens: 0,
-      completionTokens: 0,
+      model: used?.model ?? parsed.model,
+      supplierPkh: used?.supplierPkh ?? null,
+      escrowRef: escrowRefStr,
+      costLovelace: used?.priceLovelace ?? null,
+      promptTokens: result?.usage.prompt_tokens ?? 0,
+      completionTokens: result?.usage.completion_tokens ?? 0,
       status: "failed",
       failureReason: err instanceof Error ? err.message : String(err),
     });
+
+    // Structured failure line mirroring ocr_settled's shape (same venue /
+    // run_user_hash / escrow_ref fields) so paid-but-failed jobs — an
+    // escrow posted on-chain, then a later step (supplier call, settle)
+    // failed — can still be reconciled against on-chain state instead of
+    // vanishing from the wedge-ledger emitter's input (I2 review finding).
+    console.log(JSON.stringify({
+      evt: "ocr_failed",
+      escrow_ref: escrowRefStr,
+      capability_id: capabilityId,
+      model: used?.model ?? parsed.model,
+      supplier_pkh: used?.supplierPkh ?? null,
+      venue: attribution.venue,
+      run_user_hash: attribution.runUserHash,
+      error: err instanceof Error ? err.message : String(err),
+      ts: new Date().toISOString(),
+    }));
+
     throw err;
   }
 }
diff --git a/gateway/src/onchain/preflight.ts b/gateway/src/onchain/preflight.ts
index 8ede3a7..3fe009d 100644
--- a/gateway/src/onchain/preflight.ts
+++ b/gateway/src/onchain/preflight.ts
@@ -2,14 +2,20 @@
  * gateway/src/onchain/preflight.ts — balance + collateral pre-flight.
  *
  * The buyer wallet funds the FULL escrow at PostEscrow: price + buyer_bond +
- * supplier_bond (postEscrow.ts:132). Accept/Reclaim are Plutus script-spends
- * that also need a pure-AP3X collateral UTxO ≥ 5 AP3X (assertCollateralCandidate).
- * So required = price + buyer_bond + supplier_bond + collateral + fee reserve,
- * AND the wallet must currently hold a pure-AP3X UTxO ≥ collateral. We check both
- * up front and return a clean 402 instead of failing mid-flight.
+ * supplier_bond, raised to the Submitted-state min-ada floor so long
+ * capability ids (e.g. the 33-byte OCR one) don't get bumped mid-flight —
+ * see escrowLockFloor (packages/shared/.../minAdaFloor.ts) and
+ * postOcrEscrow.ts:205, the SAME floor a POST actually locks. Accept/Reclaim
+ * are Plutus script-spends that also need a pure-AP3X collateral UTxO ≥ 5
+ * AP3X (assertCollateralCandidate). So required = escrowLockFloor(price +
+ * buyer_bond + supplier_bond) + collateral + fee reserve, AND the wallet
+ * must currently hold a pure-AP3X UTxO ≥ collateral. We check both up front
+ * and return a clean 402 instead of failing mid-flight.
  */
 
 import type { ChainProvider, Utxo } from "@marketplace/shared/chain";
+import type { EscrowDatum } from "@marketplace/shared/cbor";
+import { escrowLockFloor } from "@marketplace/shared/tx";
 
 export const COLLATERAL_MIN_LOVELACE = 5_000_000n;
 export const FEE_RESERVE_LOVELACE = 2_000_000n;
@@ -32,20 +38,48 @@ export interface PreflightResult {
   collateralOk: boolean;
 }
 
+export interface PreflightCost {
+  capabilityId: string;
+  priceLovelace: bigint;
+  buyerBondLovelace: bigint;
+  supplierBondLovelace: bigint;
+}
+
+/** Placeholder datum used only to size-estimate the Submitted-state min-ada
+ * floor. Every field except capability_id and the cost amounts is a
+ * fixed-size stand-in (real hash/pkh byte widths, a realistic 13-digit
+ * POSIX-ms timestamp) — capability_id's actual length is what drives the
+ * estimate, exactly as in escrowLockFloor's own contract. */
+function representativeEscrowDatum(cost: PreflightCost): EscrowDatum {
+  return {
+    buyer_pkh: "3b2fdaed0398485ff35887fb7d0ad2025348864407854f7831dc6a55",
+    supplier_pkh: "401af418a7e6fb106277292881fcdeaa1cc15b5b112e9c8bdb2d46c9",
+    advert_ref: { txHash: "a6".repeat(32), index: 0 },
+    capability_id: cost.capabilityId,
+    request_spec_hash: "1b".repeat(32),
+    prompt_hash: "23".repeat(32),
+    payment_lovelace: cost.priceLovelace,
+    buyer_bond_lovelace: cost.buyerBondLovelace,
+    supplier_bond_lovelace: cost.supplierBondLovelace,
+    deliver_by: 1_786_105_955_257,
+    posted_at: 1_786_105_625_257,
+    submitted_at: null,
+    result_receipt_hash: null,
+    state: "Open",
+  };
+}
+
 export async function preflight(
   chain: ChainProvider,
   address: string,
-  cost: { priceLovelace: bigint; buyerBondLovelace: bigint; supplierBondLovelace: bigint },
+  cost: PreflightCost,
 ): Promise<PreflightResult> {
   const utxos = await chain.queryUtxosByAddress(address);
   const available = totalLovelace(utxos);
   const collateralOk = hasCollateral(utxos);
-  const required =
-    cost.priceLovelace +
-    cost.buyerBondLovelace +
-    cost.supplierBondLovelace +
-    COLLATERAL_MIN_LOVELACE +
-    FEE_RESERVE_LOVELACE;
+  const economicTotal = cost.priceLovelace + cost.buyerBondLovelace + cost.supplierBondLovelace;
+  const escrowFloor = escrowLockFloor(representativeEscrowDatum(cost), economicTotal);
+  const required = escrowFloor + COLLATERAL_MIN_LOVELACE + FEE_RESERVE_LOVELACE;
   return {
     ok: available >= required && collateralOk,
     availableLovelace: available,
diff --git a/gateway/src/server.ts b/gateway/src/server.ts
index 69772bb..aa4a5cf 100644
--- a/gateway/src/server.ts
+++ b/gateway/src/server.ts
@@ -61,7 +61,7 @@ export function createApp(deps: GatewayDeps): Express {
   // the route; every other path keeps the 1mb ceiling.
   const jsonBody = express.json({ limit: "1mb" });
   app.use((req, res, next) =>
-    req.path.startsWith("/v1/ocr") ? next() : jsonBody(req, res, next));
+    req.path.startsWith("/v1/ocr/") ? next() : jsonBody(req, res, next));
 
   app.get("/healthz", (_req: Request, res: Response) => {
     res.json({ ok: true });
@@ -86,8 +86,11 @@ export function createApp(deps: GatewayDeps): Express {
 
   app.post("/openai/v1/chat/completions", ...gated, makeChatCompletionsHandler(deps));
   // Model-scoped OCR: 16mb parser covers MAX_OCR_IMAGE_B64_CHARS
-  // (~12M chars ≈ 9 MB binary) plus JSON envelope.
-  app.post("/v1/ocr/extract", express.json({ limit: "16mb" }), ...gated, makeOcrExtractHandler(deps));
+  // (~12M chars ≈ 9 MB binary) plus JSON envelope. Gates (auth + rate
+  // limits) run BEFORE the parser so an unauthenticated caller cannot
+  // buffer/JSON.parse up to 16mb before getting a 401, and rate limiting
+  // can actually throttle the request (2026-08 review finding C2).
+  app.post("/v1/ocr/extract", ...gated, express.json({ limit: "16mb" }), makeOcrExtractHandler(deps));
   app.get("/openai/v1/models", auth, makeModelsHandler(deps));
   app.post("/openai/v1/chat/sessions", ...gated, makeOpenSessionHandler(deps));
   app.post("/openai/v1/chat/sessions/:id/messages", ...gated, makeSessionMessageHandler(deps));
diff --git a/gateway/test/ocr.test.ts b/gateway/test/ocr.test.ts
index 6df93b9..3a6fcbd 100644
--- a/gateway/test/ocr.test.ts
+++ b/gateway/test/ocr.test.ts
@@ -7,7 +7,7 @@
  * covered by http.test.ts + the SDK suites; end-to-end runs live on testnet.
  */
 
-import { describe, it, expect } from "vitest";
+import { describe, it, expect, vi } from "vitest";
 import { tmpdir } from "os";
 import { join } from "path";
 import { randomBytes, randomUUID } from "crypto";
@@ -18,13 +18,49 @@ import { SdkRegistry } from "../src/sdk/registry.js";
 import { genPrivKeyHex, deriveWalletKey } from "../src/wallet.js";
 import { seal } from "../src/crypto/seal.js";
 import { hashApiKey } from "../src/middleware/apiKeyAuth.js";
+import { venueAttribution } from "../src/ocr/extract.js";
 import type { GatewayConfig } from "../src/config.js";
 import type { GatewayDeps } from "../src/deps.js";
 
+// The one-shot settle step (resolveSubmittedRef → acceptAndConfirm) talks to
+// the live indexer + chain; the happy-path route test below only needs to
+// prove that a successful submitOcr reaches the response with the
+// first-party-brokered disclosure label (I3), so it stubs just those two
+// chain-touching steps and keeps every other export real.
+vi.mock("../src/onchain/settle.js", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("../src/onchain/settle.js")>();
+  return {
+    ...actual,
+    resolveSubmittedRef: vi.fn(async () => ({ txHash: "e".repeat(64), index: 0 })),
+    acceptAndConfirm: vi.fn(async () => "f".repeat(64)),
+  };
+});
+
 const MASTER = "ab".repeat(32);
 const IMG = Buffer.from("page bytes").toString("base64");
 
-function makeDeps(fetchFn?: typeof globalThis.fetch): GatewayDeps {
+/** A funded wallet: covers price+bonds+collateral+fee and has pure-ADA ≥ 5. */
+const fundedChain = {
+  queryUtxosByAddress: async () => [
+    { ref: { txHash: "ff".repeat(32), index: 0 }, address: "a", lovelace: 20_000_000n, assets: {}, datumHex: null, scriptRef: null },
+  ],
+} as unknown as GatewayDeps["chain"];
+
+const OCR_SUPPLIER = {
+  utxo_ref: `${"cc".repeat(32)}#0`,
+  supplier_pkh: "s3",
+  capability_id: "ocr.page.extract.chandra-ocr-2.v1",
+  model: "chandra-ocr-2",
+  max_output_tokens: 4096,
+  price_lovelace: "200000",
+  supplier_bond_lovelace: "1000000",
+  buyer_bond_lovelace: "1000000",
+  endpoint_url: "http://sup",
+  advert_status: "Active",
+  status: "free",
+};
+
+function makeDeps(fetchFn?: typeof globalThis.fetch, overrides?: { chain?: GatewayDeps["chain"] }): GatewayDeps {
   const dbDir = join(tmpdir(), `gw-ocr-test-${randomUUID()}`);
   const store = new GatewayStore(dbDir);
   const config: GatewayConfig = {
@@ -46,7 +82,7 @@ function makeDeps(fetchFn?: typeof globalThis.fetch): GatewayDeps {
     ocrCapabilityId: "ocr.page.extract.chandra-ocr-2.v1",
     corsOrigins: [],
   };
-  const chain = { queryUtxosByAddress: async () => [] } as unknown as GatewayDeps["chain"];
+  const chain = overrides?.chain ?? ({ queryUtxosByAddress: async () => [] } as unknown as GatewayDeps["chain"]);
   const registry = new SdkRegistry({
     chain,
     indexerUrl: config.indexerUrl,
@@ -194,3 +230,98 @@ describe("POST /v1/ocr/extract — supplier lookup + body limit", () => {
     expect(res.status).toBe(413);
   });
 });
+
+// ─── venueAttribution — pure-function header sanitization (I3) ──────────────
+//
+// grep for "first-party-brokered" used to return only source lines: nothing
+// exercised venueAttribution's regex gates or RECEIPT_LABELS_V0 reaching the
+// wire. These two blocks close that gap.
+
+function fakeReq(headers: Record<string, string>): Parameters<typeof venueAttribution>[0] {
+  return { header: (name: string) => headers[name] } as unknown as Parameters<typeof venueAttribution>[0];
+}
+
+describe("venueAttribution — header sanitization", () => {
+  it("passes through a valid venue slug and a valid lowercase hash", () => {
+    const hash = "a".repeat(64);
+    const out = venueAttribution(fakeReq({ "X-Venue": "apify", "X-Run-User-Hash": hash }));
+    expect(out).toEqual({ venue: "apify", runUserHash: hash });
+  });
+
+  it("lowercases a valid but uppercase hex hash", () => {
+    const out = venueAttribution(fakeReq({ "X-Venue": "apify", "X-Run-User-Hash": "A".repeat(64) }));
+    expect(out.runUserHash).toBe("a".repeat(64));
+  });
+
+  it("drops an invalid venue to empty string (uppercase, bad chars, oversized)", () => {
+    for (const bad of ["Apify", "apify!", "apify_venue", "a".repeat(33)]) {
+      const out = venueAttribution(fakeReq({ "X-Venue": bad, "X-Run-User-Hash": "a".repeat(64) }));
+      expect(out.venue).toBe("");
+    }
+  });
+
+  it("drops an invalid run-user-hash to empty string (wrong length, non-hex)", () => {
+    for (const bad of ["a".repeat(63), "a".repeat(65), "z".repeat(64), "not-hex-at-all"]) {
+      const out = venueAttribution(fakeReq({ "X-Venue": "apify", "X-Run-User-Hash": bad }));
+      expect(out.runUserHash).toBe("");
+    }
+  });
+
+  it("defaults both fields to empty string when headers are missing", () => {
+    const out = venueAttribution(fakeReq({}));
+    expect(out).toEqual({ venue: "", runUserHash: "" });
+  });
+});
+
+// ─── Happy path — receipt disclosure label reaches the response (I3) ────────
+
+describe("POST /v1/ocr/extract — happy path", () => {
+  it("200 response x_vector.receipt_labels contains first-party-brokered", async () => {
+    const fetchFn = (async (url: unknown) => {
+      const u = String(url);
+      if (u.includes("/suppliers")) {
+        return new Response(JSON.stringify([OCR_SUPPLIER]), { status: 200 });
+      }
+      return new Response("[]", { status: 200 });
+    }) as unknown as typeof globalThis.fetch;
+
+    const deps = makeDeps(fetchFn, { chain: fundedChain });
+    const rawKey = makeKey(deps, 0);
+    const keyRow = deps.store.getKeyByHash(hashApiKey(rawKey))!;
+
+    // Stub only the chain-touching supplier call; escrow ref shape matches
+    // what resolveSubmittedRef's mock (module-level, top of file) expects.
+    const ctx = deps.registry.getContext(keyRow);
+    const submitOcr = vi.fn(async () => ({
+      output_format: "markdown",
+      content: "extracted text",
+      usage: { prompt_tokens: 10, completion_tokens: 5, total_tokens: 15 },
+      receipt: {
+        prompt_hash: "1b".repeat(32),
+        response_hash: "2c".repeat(32),
+        model: "chandra-ocr-2",
+        prompt_tokens: 10,
+        completion_tokens: 5,
+        wallclock_ms: Date.now(),
+        supplier_pkh: "s3",
+        escrow_ref: `${"d".repeat(64)}#0`,
+      },
+      receiptSignature: "sig".repeat(20),
+      escrowRef: { txHash: "d".repeat(64), index: 0 },
+    }));
+    (ctx.sdk as { submitOcr: unknown }).submitOcr = submitOcr;
+
+    const res = await request(createApp(deps))
+      .post("/v1/ocr/extract")
+      .set("Authorization", `Bearer ${rawKey}`)
+      .send(validBody());
+
+    expect(res.status).toBe(200);
+    expect(submitOcr).toHaveBeenCalledTimes(1);
+    expect(res.body.x_vector.receipt_labels).toContain("first-party-brokered");
+    // escrow_ref in the response comes from submitOcr's returned escrowRef
+    // (the ORIGINAL Open ref), not the mocked resolveSubmittedRef's answer —
+    // see settle.ts's docstring on why those two refs differ on-chain.
+    expect(res.body.x_vector.escrow_ref).toBe(`${"d".repeat(64)}#0`);
+  });
+});
diff --git a/gateway/test/unit.test.ts b/gateway/test/unit.test.ts
index c435613..2f5bd1a 100644
--- a/gateway/test/unit.test.ts
+++ b/gateway/test/unit.test.ts
@@ -208,8 +208,16 @@ describe("onchain/preflight", () => {
   });
 
   it("preflight requires balance AND collateral", async () => {
-    const cost = { priceLovelace: 2_000_000n, buyerBondLovelace: 1_000_000n, supplierBondLovelace: 1_000_000n };
-    // required = 2 + 1 + 1 + 5 (collateral) + 2 (fee) = 11 ADA
+    const cost = {
+      capabilityId: "llm.text.generate.v1",
+      priceLovelace: 2_000_000n,
+      buyerBondLovelace: 1_000_000n,
+      supplierBondLovelace: 1_000_000n,
+    };
+    // required = escrowLockFloor(2 + 1 + 1) + 5 (collateral) + 2 (fee) = 11 ADA
+    // — at this economic total (4 ADA) the Submitted-state min-ada floor for a
+    // short capability id (~2.2 ADA) stays well under the raw total, so the
+    // floor is a no-op here; tx-minada-floor.test.ts covers the lifted case.
     const fakeChain = { queryUtxosByAddress: async () => [pure(20_000_000n)] } as any;
     const ok = await preflight(fakeChain, "a", cost);
     expect(ok.ok).toBe(true);
diff --git a/packages/shared/src/tx/index.ts b/packages/shared/src/tx/index.ts
index fadff01..dd5b5c7 100644
--- a/packages/shared/src/tx/index.ts
+++ b/packages/shared/src/tx/index.ts
@@ -7,6 +7,7 @@ export { TxConstructionError } from "./types.js";
 export { normalizeChatMessage, chatMessagesEquivalent, toolCallsEqual } from "./chatMessage.js";
 export { mockSlotToWallclockMs, mockWallclockMsToSlot, NETWORK_BUFFER_MS } from "./internal/constants.js";
 export { detectCborBackend, type CborBackend } from "./internal/cborBackend.js";
+export { escrowLockFloor, minAdaForEscrowDatum } from "./internal/minAdaFloor.js";
 export type { Signer } from "./signer.js";
 export { MockSigner } from "./signer.js";
 export type { Blueprint } from "./blueprint.js";
diff --git a/supplier/.env.chandra.example b/supplier/.env.chandra.example
index a46739c..09a7285 100644
--- a/supplier/.env.chandra.example
+++ b/supplier/.env.chandra.example
@@ -52,7 +52,6 @@ OPENAI_TIMEOUT_MS=120000          # page inference is seconds; keep < advert max
 # openai-vision upstream only (attestation upgrade path):
 # OCR_PROMPT_OVERRIDE=            # exact serving prompt, pinned at integration
 # HF_MODEL_REVISION=              # 40-hex checkpoint SHA; mismatch refuses Claim
-# HF_WEIGHTS_SOURCE=hf:datalab-to/chandra-ocr-2
 # REVISION_PROBE_URL=             # e.g. http://chandra-vllm:8000/info
 
 # ── Service ───────────────────────────────────────────────────────────────
diff --git a/supplier/chandra-detail.example.json b/supplier/chandra-detail.example.json
index c5b6747..60dc173 100644
--- a/supplier/chandra-detail.example.json
+++ b/supplier/chandra-detail.example.json
@@ -1,7 +1,7 @@
 {
   "capability_id": "ocr.page.extract.chandra-ocr-2.v1",
   "weights_source": "hf:datalab-to/chandra-ocr-2",
-  "model_revision": "<40-hex commit SHA pinned at endpoint provisioning>",
+  "model_revision": "<40-hex commit SHA; self-hosted (OCR_UPSTREAM=openai-vision) deployments only — the Datalab-hosted default (OCR_UPSTREAM=datalab) is a third-party API with no pinnable checkpoint, so this is unset there>",
   "license": "modified OpenRAIL-M (weights); Apache-2.0 (code)",
   "request_shape": {
     "route": "POST /v1/ocr/extract",
@@ -14,8 +14,8 @@
     "verify": "GET /capability → pub_key_hex; verify signature over canonical(receipt)"
   },
   "revision_probe": {
-    "route": "<runtime info route reporting the loaded checkpoint>",
-    "policy": "probe before every Claim; mismatch refuses the job"
+    "route": "<runtime info route reporting the loaded checkpoint; self-hosted (openai-vision) upstream only>",
+    "policy": "self-hosted (OCR_UPSTREAM=openai-vision) upstream: probe before every Claim, mismatch refuses the job. Datalab-hosted default (OCR_UPSTREAM=datalab): per-job liveness probe only, no checkpoint pin."
   },
   "operator_disclosure": "first-party (HAL8-operated supplier)"
 }
diff --git a/supplier/src/config.ts b/supplier/src/config.ts
index 57fe13b..df17b26 100644
--- a/supplier/src/config.ts
+++ b/supplier/src/config.ts
@@ -165,12 +165,6 @@ export interface SupplierConfig {
    * Env: HF_MODEL_REVISION. "" = no pin.
    */
   hfModelRevision: string;
-  /**
-   * Hub identity of the served weights, e.g. "hf:datalab-to/chandra-ocr-2".
-   * Recorded for telemetry now; feeds the receipt extension when that
-   * schema is added. Env: HF_WEIGHTS_SOURCE. "" = unset.
-   */
-  hfWeightsSource: string;
   /**
    * Serving-runtime info route reporting the loaded checkpoint (TGI-style
    * /info or vLLM equivalent). Env: REVISION_PROBE_URL. "" = probing off.
@@ -422,7 +416,6 @@ export function loadConfig(env: Record<string, string | undefined>): SupplierCon
   if (hfModelRevision !== "" && !/^[0-9a-fA-F]{40}$/.test(hfModelRevision)) {
     throw new Error("loadConfig: HF_MODEL_REVISION must be a 40-hex commit SHA when set");
   }
-  const hfWeightsSource = env.HF_WEIGHTS_SOURCE ?? "";
   const revisionProbeUrl = env.REVISION_PROBE_URL ?? "";
   // Datalab upstream: the health route is derived from DATALAB_BASE_URL, so
   // the liveness probe defaults ON without a REVISION_PROBE_URL. The
@@ -489,7 +482,6 @@ export function loadConfig(env: Record<string, string | undefined>): SupplierCon
     datalabTimeoutMs,
     ocrPromptOverride,
     hfModelRevision,
-    hfWeightsSource,
     revisionProbeUrl,
     revisionProbeMode,
     liveChain,
diff --git a/supplier/src/server.ts b/supplier/src/server.ts
index bfbb637..c19d09b 100644
--- a/supplier/src/server.ts
+++ b/supplier/src/server.ts
@@ -1385,7 +1385,7 @@ export function createApp(deps: SupplierDeps): Application {
   // below; every other route keeps the 1mb ceiling.
   const jsonBody = express.json({ limit: "1mb" });
   app.use((req, res, next) =>
-    req.path.startsWith("/v1/ocr") ? next() : jsonBody(req, res, next));
+    req.path.startsWith("/v1/ocr/") ? next() : jsonBody(req, res, next));
 
   // /healthz is mounted FIRST and uses no deps — it must succeed regardless
   // of chain/state/config (independent of /status free/working/offline).
diff --git a/tests/fixtures/supplier-side/sample-config.ts b/tests/fixtures/supplier-side/sample-config.ts
index b2709a1..9e8e980 100644
--- a/tests/fixtures/supplier-side/sample-config.ts
+++ b/tests/fixtures/supplier-side/sample-config.ts
@@ -65,7 +65,6 @@ export function buildSampleOcrConfig(): SupplierConfig {
     datalabTimeoutMs: 120_000,
     ocrPromptOverride: "",
     hfModelRevision: "",
-    hfWeightsSource: "",
     revisionProbeUrl: "",
     revisionProbeMode: "off",
   };
diff --git a/tests/unit/supplier-routes-ocr.test.ts b/tests/unit/supplier-routes-ocr.test.ts
index 7cb6438..0f40b50 100644
--- a/tests/unit/supplier-routes-ocr.test.ts
+++ b/tests/unit/supplier-routes-ocr.test.ts
@@ -138,7 +138,7 @@ describe("POST /v1/ocr/extract — header + body validation", () => {
 });
 
 describe("POST /v1/ocr/extract — revision-probe gate", () => {
-  it("503 revision_probe_failed when the probe cannot reach the runtime", async () => {
+  it("503 advert_unavailable — chain validation runs before the revision probe fires", async () => {
     // Advert/escrow would resolve AFTER the probe? No — probe runs at step
     // 7.5, after chain checks. Seeding a full escrow in the mock provider is
     // the chat-route suite's job; here we assert the config gate wiring by
diff --git a/tests/unit/tx-post-ocr-escrow.test.ts b/tests/unit/tx-post-ocr-escrow.test.ts
index 8c8fc65..ceb9001 100644
--- a/tests/unit/tx-post-ocr-escrow.test.ts
+++ b/tests/unit/tx-post-ocr-escrow.test.ts
@@ -24,6 +24,13 @@ import {
 } from "../../packages/shared/src/tx/index.js";
 import { canonicalize } from "../../packages/shared/src/cbor/canonical.js";
 import { MockChainProvider } from "../../packages/shared/src/chain/MockChainProvider.js";
+import { encodeAdvertDatum } from "../../packages/shared/src/cbor/AdvertDatum.js";
+import { decodeEscrowDatum } from "../../packages/shared/src/cbor/EscrowDatum.js";
+import { escrowLockFloor } from "../../packages/shared/src/tx/internal/minAdaFloor.js";
+import type { AdvertDatum } from "../../packages/shared/src/cbor/types.js";
+import type { Utxo, OutputReference } from "../../packages/shared/src/chain/ChainProvider.js";
+import { buildBuyerWalletKey } from "../fixtures/buyer-side/wallet-keys.js";
+import { buildSupplierWalletKey } from "../fixtures/supplier-side/wallet-keys.js";
 
 const IMG = Buffer.from("not really a png but bytes are bytes").toString("base64");
 
@@ -120,3 +127,74 @@ describe("buildPostOcrEscrowTx — validation precedes chain access", () => {
     })).rejects.toMatchObject({ reason: "advert ref not on chain" });
   });
 });
+
+describe("buildPostOcrEscrowTx — happy path locks the min-ada floor (C1 regression)", () => {
+  // Guards packages/shared/src/tx/escrow/postOcrEscrow.ts:205
+  // (`escrowLockFloor(escrowDatum, economicTotal)`). Without that call the
+  // escrow locks only the raw economic total, the Submit continuing output
+  // gets bumped to min-ada, value_equal fails, and the validator errors with
+  // an empty trace — the 2026-08-07 mainnet incident. Neither existing
+  // `buildPostOcrEscrowTx` test above reaches line 205 (both throw first),
+  // so this is the only test that would catch a regression back to a bare
+  // `economicTotal` assignment.
+  const ADVERT_SCRIPT_ADDRESS = "addr_test1wrqq9qqjzf3uh4w9hm0kqzrpvt60r4ryjp5rjf5epd3nptq7yscm6";
+  const ADVERT_REF: OutputReference = { txHash: "c".repeat(64), index: 0 };
+  const PRICE = 200_000n;
+  const BUYER_BOND = 1_000_000n;
+  const SUPPLIER_BOND = 1_000_000n;
+  const ECONOMIC_TOTAL = PRICE + BUYER_BOND + SUPPLIER_BOND; // 2_200_000n
+
+  function makeOcrAdvert(): AdvertDatum {
+    const supplier = buildSupplierWalletKey();
+    return {
+      supplier_pkh: supplier.pubKeyHash,
+      capability_id: "ocr.page.extract.chandra-ocr-2.v1",
+      model: "chandra-ocr-2",
+      max_output_tokens: 4096,
+      max_processing_ms: 60_000,
+      price_lovelace: PRICE,
+      supplier_bond_lovelace: SUPPLIER_BOND,
+      buyer_bond_lovelace: BUYER_BOND,
+      endpoint_url: "https://supplier.example.com/v1",
+      detail_uri: "ipfs://Qm000",
+      detail_hash: "a".repeat(64),
+      advertised_at: 1_745_500_000_000,
+      status: "Active",
+    };
+  }
+
+  function seedOcrAdvert(chain: MockChainProvider): void {
+    const utxo: Utxo = {
+      ref: ADVERT_REF,
+      address: ADVERT_SCRIPT_ADDRESS,
+      lovelace: 2_000_000n,
+      assets: {},
+      datumHex: encodeAdvertDatum(makeOcrAdvert()),
+      scriptRef: null,
+    };
+    chain.seed(utxo);
+  }
+
+  it("locks escrowLockFloor(datum, economicTotal), strictly above the raw economic total", async () => {
+    const chain = new MockChainProvider();
+    chain.advanceSlot(1_745_500_000);
+    seedOcrAdvert(chain);
+
+    const buyer = buildBuyerWalletKey();
+    const result = await buildPostOcrEscrowTx({
+      chain,
+      buyerKey: buyer,
+      advertRef: ADVERT_REF,
+      request: validRequest(),
+      payment_lovelace: PRICE,
+    });
+
+    const escrowUtxo = await chain.queryUtxo(result.escrowOutputRef);
+    expect(escrowUtxo).not.toBeNull();
+    const datum = decodeEscrowDatum(escrowUtxo!.datumHex!);
+
+    const expectedFloor = escrowLockFloor(datum, ECONOMIC_TOTAL);
+    expect(escrowUtxo!.lovelace).toBe(expectedFloor);
+    expect(escrowUtxo!.lovelace).toBeGreaterThan(ECONOMIC_TOTAL);
+  });
+});