diff --git a/docs/producer-receiver-contract.md b/docs/producer-receiver-contract.md
index 6edc9e34..77753e13 100644
--- a/docs/producer-receiver-contract.md
+++ b/docs/producer-receiver-contract.md
@@ -1,6 +1,6 @@
 # Offline producer → receiver contracts
 
-This test-only gate executes the **real upstream projection and strip functions**,
+This offline gate executes the **real upstream projection and strip functions**,
 then sends their unchanged synthetic output through QRS's authenticated sync
 handler, local Miniflare SQLite persistence, read model and balance history.
 It does not run either publisher CLI, use credentials, contact a broker/cloud,
@@ -17,12 +17,12 @@ change publisher stripping, deploy, merge, or establish runtime adoption.
 - [Schwab 5b563ad3609eefd9cf431ead82d0f30c586645db](https://github.com/QuantStrategyLab/CharlesSchwabPlatform/blob/5b563ad3609eefd9cf431ead82d0f30c586645db/scripts/publish_account_facts_from_reports.py):
   `project_schwab_account_facts_history` plus `strip_archive_only_keys`.
   The stripped contract is accepted, balances/history remain readable, and absent
-  cash stays absent. **The archive contract is incompatible**: each projected
-  holding has `currency_source: "owner_confirmed"`, while QRS's exact-key position
-  validator rejects that extra key with HTTP 400 `invalid_account_facts_positions`.
-  The negative test preserves this known blocker and proves rejection does not
-  overwrite accepted data. A green CI job does **not** mean Schwab holdings can
-  be enabled. The test must change with any separately approved contract repair.
+  cash stays absent. The unchanged archive contract is now accepted: each
+  projected holding carries `currency_source: "owner_confirmed"`, explicitly
+  validated and preserved by QRS in latest readback and durable daily history.
+  Unknown keys and malformed provenance are rejected without changing accepted
+  data. A newer stripped payload clears latest holdings and retains older evidence.
+  This is **future publication compatibility**, not enabled publication.
 
 The receiver baseline is QRS
 [6070efb73cde35fd5ffafd5d3da196e04b462e42](https://github.com/QuantStrategyLab/QuantRuntimeSettings/commit/6070efb73cde35fd5ffafd5d3da196e04b462e42).
@@ -31,16 +31,30 @@ visible against these pinned producer contracts. This complements the existing
 `account_facts_validation.mjs` malformed-payload and rollback coverage, rather
 than replacing it or duplicating the full validator matrix.
 
-### Schwab decision required before future publication
-
-A separate authorized design decision must choose either a publisher boundary
-mapping that deliberately removes position currency provenance, or explicit
-receiver support that validates and preserves `owner_confirmed` semantics.
-Do not silently strip the field in this test or imply USD was broker-confirmed.
-Neither change is included here. Keep current stripping enabled. See
-[holdings rollout and rollback](account-facts-holdings-rollout.md) for the separate
-runtime-evidence, publication and receiver-downgrade gates. This suite does not
-claim an actual pre-holdings receiver downgrade was executed.
+### Schwab provenance compatibility decision
+
+QRS accepts the optional holding field `currency_source` only for Schwab, only
+with the exact value `owner_confirmed`, and only alongside an explicit `USD`
+currency. It does not infer a currency or add provenance to legacy rows lacking
+this field. All other unknown row keys remain invalid, and IBKR's contract is
+unchanged. Optional `avg_cost` remains independently decimal-validated.
+
+The pinned producer's `_project_positions` accepts runtime currency `None` or
+`USD` and explicitly marks the resulting USD as owner-confirmed. A boundary
+projection that drops this field would discard that distinction. Preserving it
+requires only a narrow receiver normalization/type extension, no producer edits,
+new dependencies, storage migration or changes to broker execution. Existing
+Schwab holdings without provenance remain readable for backward compatibility.
+
+Keep current publisher stripping enabled. Receiver release needs separate
+approval (merging console runtime changes to `main` triggers automatic deploy),
+followed by deployed-revision/read-only health evidence and actual restricted
+runtime-report evidence, before any separately approved publisher enablement.
+See [holdings rollout and rollback](account-facts-holdings-rollout.md). After new
+rows have been stored, a receiver downgrade that rejects `currency_source` can
+also reject retained history; retain this compatibility unless a separate
+migration/downgrade plan is approved. This suite does not establish production
+adoption or execute an actual receiver downgrade.
 
 ## Reproduce
 
@@ -92,14 +106,19 @@ or successful coverage. No generated account payload is uploaded as an artifact.
 - IBKR：当前剥离载荷可接收；归档扩展载荷的 `stocks_only` 也可接收，但这只是
   未来发布契约兼容性。更新的剥离载荷清除最新持仓，旧日期证据保留，未知资产
   仍为历史缺口而不是零。
-- Schwab：当前剥离载荷可接收；扩展载荷的每行有
-  `currency_source: owner_confirmed`，接收端精确键校验以 HTTP 400 拒绝。
-  测试明确验证这一未修复阻塞以及原有余额和历史不受影响。CI 通过不代表可以
-  开启 Schwab 持仓发布，不能修改测试数据掩盖不兼容。
-
-未来需要单独批准：在发布边界明确舍弃货币来源字段，或让接收端显式校验并保留
-该来源语义。本次不实施任一方案。继续保持剥离，运行时证据、发布与降级仍遵守
-独立发布门槛。本测试未执行旧接收端降级。
+- Schwab：当前剥离载荷与未修改的扩展归档载荷均可接收；每行显式
+  `currency_source: owner_confirmed` 会保留在最新读模型及每日历史。未知字段、
+  非法来源或来源搭配非 USD 货币均拒绝，且不覆盖已接收的数据。新的剥离载荷
+  清除最新持仓，但保留旧日期证据。CI 通过不代表已开启持仓发送。
+
+采用接收端窄范围兼容：该可选字段仅允许 Schwab 的显式 USD 与
+`owner_confirmed`，不补货币、不推断来源；无来源的旧行仍可读，IBKR 不变。
+发布器将运行时未知货币投影为所有者确认的 USD，删除字段会丢失这一区别，
+因此显式校验并保留；不改发布器、固定版本、存储结构或部署流程。
+继续保持剥离。接收端合并会自动部署，需另行批准；再核验已部署版本、只读健康
+和受限真实运行报告，最后单独批准发布器启用。写入带来源的历史后，直接降级到
+拒绝该字段的接收端会影响历史读取，需独立兼容或迁移方案。合成测试不证明生产
+采用，也未执行真实降级。
 
 源清单记录仓库、完整 SHA、文件路径和内容摘要；生成器检查版本及字节一致，
 不会复制生产代码或增加运行依赖。默认固定时间用于重复生成比对，集成测试在
diff --git a/tests/account_facts_validation.mjs b/tests/account_facts_validation.mjs
index a613034c..2f7b10c4 100644
--- a/tests/account_facts_validation.mjs
+++ b/tests/account_facts_validation.mjs
@@ -1280,6 +1280,34 @@ const schwabWithPositions = normalizeAccountFactsHistoryPayload(schwabHistory({
   broker_reported_positions_scope: "strategy_symbols_only",
 }));
 assert.equal(schwabWithPositions.broker_reported_positions_scope, "strategy_symbols_only");
+assert.equal(Object.hasOwn(schwabWithPositions.broker_reported_positions[0], "currency_source"), false,
+  "legacy holdings do not acquire inferred provenance");
+const schwabPosition = schwabWithPositions.broker_reported_positions[0];
+for (const avgCost of [{}, { avg_cost: "90" }]) {
+  const row = { ...schwabPosition, ...avgCost, currency_source: "owner_confirmed" };
+  const normalized = normalizeAccountFactsHistoryPayload(schwabHistory({
+    broker_reported_positions: [row], broker_reported_positions_scope: "strategy_symbols_only",
+  }));
+  assert.deepEqual(normalized.broker_reported_positions, [row]);
+}
+for (const patch of [
+  ...[null, "", "broker", "owner_confirmed_wrongly", 1, true, {}, []].map(currency_source => ({ currency_source })),
+  { currency_source: "owner_confirmed", currency: "HKD" },
+  { currency_source: "owner_confirmed", currency: null },
+  { currency_source: "owner_confirmed", currency: undefined },
+  { currency_source: "owner_confirmed", unexpected: "field" },
+  { currency_source: "owner_confirmed", avg_cost: "invalid" },
+]) {
+  assert.throws(() => normalizeAccountFactsHistoryPayload(schwabHistory({
+    broker_reported_positions: [{ ...schwabPosition, ...patch }],
+    broker_reported_positions_scope: "strategy_symbols_only",
+  })), /invalid_account_facts_positions/);
+}
+assert.throws(() => normalizeAccountFactsHistoryPayload(ibkrHistory({
+  broker_reported_positions: [{ ...ibkrPositions[0], currency_source: "owner_confirmed" }],
+  broker_reported_positions_scope: "stocks_only",
+})), /invalid_account_facts_positions/);
+
 assert.throws(() => normalizeAccountFactsHistoryPayload(schwabHistory({
   broker_reported_positions: [{ symbol: "TQQQ", quantity: "10", market_value: "900", currency: "USD" }],
   broker_reported_positions_scope: "stocks_only",
diff --git a/tests/producer_receiver_contract_validation.mjs b/tests/producer_receiver_contract_validation.mjs
index 72baf743..7b0796f4 100644
--- a/tests/producer_receiver_contract_validation.mjs
+++ b/tests/producer_receiver_contract_validation.mjs
@@ -85,24 +85,30 @@ try {
     // Pre-strip archive output is a FUTURE publication contract, never evidence of activation.
     assert.equal(extended.broker_reported_positions_scope, expectedScope);
     const stub = namespace.get(namespace.idFromName("runtime-instances"));
-    const compatibleArchive = platform === "ibkr";
-    if (compatibleArchive) {
-      await accept(extended);
-      assert.deepEqual((await read()).positions, extended.broker_reported_positions);
-      assert.equal((await read()).positions_scope, expectedScope);
-      assert.equal((await accept(extended)).unchanged, true);
-      assert.equal((await read()).balances[0].net_assets, null);
-    } else {
-      // Real incompatibility: the producer adds currency_source, but the receiver
-      // has exact position keys. Do not sanitize producer output to make this pass.
+    await accept(extended);
+    assert.deepEqual((await read()).positions, extended.broker_reported_positions);
+    assert.equal((await read()).positions_scope, expectedScope);
+    assert.equal((await accept(extended)).unchanged, true);
+    if (platform === "ibkr") assert.equal((await read()).balances[0].net_assets, null);
+    else {
       assert.equal(extended.broker_reported_positions[0].currency_source, "owner_confirmed");
-      const rejected = await post(extended);
+      assert.deepEqual((await read()).cash, []);
+    }
+    // Reject malformed provenance and unknown keys without contaminating accepted data.
+    const invalidRows = [
+      { ...extended.broker_reported_positions[0], unexpected: "field" },
+      { ...extended.broker_reported_positions[0], currency_source: "broker" },
+      { ...extended.broker_reported_positions[0], currency_source: null },
+      ...(platform === "schwab" ? [{ ...extended.broker_reported_positions[0], currency: "HKD" }] :
+        [{ ...extended.broker_reported_positions[0], currency_source: "owner_confirmed" }]),
+    ];
+    for (const row of invalidRows) {
+      const rejected = await post({ ...extended, broker_reported_positions: [row] });
       assert.equal(rejected.status, 400);
       assert.equal((await rejected.json()).error, "invalid_account_facts_positions");
-      assert.equal(Object.hasOwn(await read(), "positions"), false);
-      assert.deepEqual((await read()).cash, []);
+      assert.deepEqual((await read()).positions, extended.broker_reported_positions);
     }
-    const valid = compatibleArchive ? extended : published;
+    const valid = extended;
     for (const [body, status] of [
       [{ ...valid, source_binding: { ...valid.source_binding, id: "0".repeat(64) } }, 409],
       [{ ...valid, target_id: "wrong-target" }, 409],
@@ -111,8 +117,7 @@ try {
       [{ ...valid, account_key: "caller-assigned" }, 400],
     ]) {
       assert.equal((await post(body)).status, status);
-      if (compatibleArchive) assert.deepEqual((await read()).positions, extended.broker_reported_positions);
-      else assert.equal(Object.hasOwn(await read(), "positions"), false);
+      assert.deepEqual((await read()).positions, extended.broker_reported_positions);
     }
     assert.equal((await post(extended, "wrong-token")).status, 401);
     // Real newer stripped output removes latest holdings without erasing previous-day evidence.
@@ -133,14 +138,9 @@ try {
     assert.equal(response.status, 200, await response.clone().text());
     const history = await response.json();
     assert.ok(history.days.length >= 2);
-    if (compatibleArchive) {
-      const old = history.days.find(day => day.payload.observation_date === extended.observation_date).payload;
-      assert.deepEqual(old.broker_reported_positions, extended.broker_reported_positions);
-      assert.equal(old.broker_reported_positions_scope, expectedScope);
-    } else {
-      assert.ok(history.days.every(day => !Object.hasOwn(day.payload, "broker_reported_positions")),
-        "rejected Schwab archive output must not contaminate durable history");
-    }
+    const old = history.days.find(day => day.payload.observation_date === extended.observation_date).payload;
+    assert.deepEqual(old.broker_reported_positions, extended.broker_reported_positions);
+    assert.equal(old.broker_reported_positions_scope, expectedScope);
     const series = await get(`/api/account-facts/history?platform=${platform}&account_key=${account.key}&currency=USD`);
     if (platform === "ibkr") {
       assert.deepEqual(series.series.points, []);
@@ -152,7 +152,7 @@ try {
     }
   }
   assert.equal(outboundCalls, 0, "neither receiver nor projections may make external HTTP calls");
-  console.log("Pinned contracts passed: stripped IBKR/Schwab accepted; IBKR archive accepted; Schwab archive BLOCKED by currency_source (synthetic/offline).");
+  console.log("Pinned contracts passed: stripped IBKR/Schwab accepted; IBKR/Schwab archive accepted with provenance preserved (synthetic/offline).");
 } finally {
   await mf.dispose();
   globalThis.fetch = nativeFetch;
diff --git a/web/strategy-switch-console/account_facts.js b/web/strategy-switch-console/account_facts.js
index 1f779f8b..361896bf 100644
--- a/web/strategy-switch-console/account_facts.js
+++ b/web/strategy-switch-console/account_facts.js
@@ -130,16 +130,23 @@ function normalizeBrokerReportedPositions(platform, raw) {
   if (!Array.isArray(rows) || rows.length === 0 || rows.length > MAX_POSITIONS) reject("invalid_account_facts_positions");
   const seen = new Set();
   const positions = rows.map((item) => {
-    const keys = Object.prototype.hasOwnProperty.call(item || {}, "avg_cost") ? [...POSITION_KEYS, "avg_cost"] : POSITION_KEYS;
+    const hasAvgCost = Object.prototype.hasOwnProperty.call(item || {}, "avg_cost");
+    const hasCurrencySource = Object.prototype.hasOwnProperty.call(item || {}, "currency_source");
+    const keys = [...POSITION_KEYS, ...(hasAvgCost ? ["avg_cost"] : []),
+      ...(hasCurrencySource ? ["currency_source"] : [])];
     if (!exactKeys(item, keys)
         || typeof item.symbol !== "string" || !POSITION_SYMBOL_RE.test(item.symbol) || seen.has(item.symbol)
         || typeof item.currency !== "string" || !CURRENCY_RE.test(item.currency)
-        || keys.slice(1).some((key) => key !== "currency" && (typeof item[key] !== "string" || !DECIMAL_RE.test(item[key])))) {
+        || (hasCurrencySource && (platform !== "schwab" || item.currency_source !== "owner_confirmed" || item.currency !== "USD"))
+        || ["quantity", "market_value", ...(hasAvgCost ? ["avg_cost"] : [])]
+          .some((key) => typeof item[key] !== "string" || !DECIMAL_RE.test(item[key]))) {
       reject("invalid_account_facts_positions");
     }
     seen.add(item.symbol);
     const row = { symbol: item.symbol, quantity: item.quantity, market_value: item.market_value, currency: item.currency };
-    if (keys.length > POSITION_KEYS.length) row.avg_cost = item.avg_cost;
+    if (hasAvgCost) row.avg_cost = item.avg_cost;
+    // Preserve the producer's explicit owner-confirmed USD provenance; never infer it.
+    if (hasCurrencySource) row.currency_source = item.currency_source;
     return row;
   });
   return { positions, scope };
diff --git a/web/strategy-switch-console/frontend/src/types.ts b/web/strategy-switch-console/frontend/src/types.ts
index 3e872768..5064259d 100644
--- a/web/strategy-switch-console/frontend/src/types.ts
+++ b/web/strategy-switch-console/frontend/src/types.ts
@@ -108,6 +108,7 @@ export type AccountFactsPosition = {
   market_value: string;
   currency: string;
   avg_cost?: string;
+  currency_source?: "owner_confirmed";
 };
 
 export type AccountFactsTotals = {