diff --git a/orchestrator/src/build/hysteriaRelease.ts b/orchestrator/src/build/hysteriaRelease.ts
index 8f08109..ae8a138 100644
--- a/orchestrator/src/build/hysteriaRelease.ts
+++ b/orchestrator/src/build/hysteriaRelease.ts
@@ -8,6 +8,13 @@
 export const HYSTERIA_UPSTREAM_REPO = "HyNetworks/hysteria";
 export const HYSTERIA_LINUX_AMD64_ASSET = "hysteria-linux-amd64";
 
+/**
+ * Upstream публикует контрольные суммы релиза отдельным ассетом. Он позволяет
+ * проверить ПРОИСХОЖДЕНИЕ артефакта, а не только его неизменность: без него
+ * SHA-256 считается от уже скачанного файла, то есть является trust-on-first-use.
+ */
+export const HYSTERIA_HASHES_ASSET = "hashes.txt";
+
 /** Upstream публикует несколько семейств тегов; серверный бинарник живёт в app/vX.Y.Z. */
 export const HYSTERIA_APP_TAG_PATTERN = /^app\/v(\d+)\.(\d+)\.(\d+)$/;
 export const HYSTERIA_VERSION_PATTERN = /^v(\d+)\.(\d+)\.(\d+)$/;
@@ -32,6 +39,8 @@ export type ResolvedHysteriaRelease = {
   tag: string;
   /** Immutable release asset URL ровно в том виде, как его отдал GitHub API. */
   artifactUrl: string;
+  /** URL ассета с контрольными суммами релиза. */
+  hashesUrl: string;
   publishedAt: string;
 };
 
@@ -68,17 +77,15 @@ function isStable(release: GithubRelease): boolean {
   return release.draft !== true && release.prerelease !== true;
 }
 
-export function selectLinuxAmd64Asset(release: GithubRelease): GithubAsset {
-  const matches = (release.assets ?? []).filter((asset) => asset.name === HYSTERIA_LINUX_AMD64_ASSET);
+export function selectAssetByName(release: GithubRelease, assetName: string): GithubAsset {
+  const matches = (release.assets ?? []).filter((asset) => asset.name === assetName);
 
   if (matches.length === 0) {
-    throw new Error(
-      `upstream release ${release.tag_name} has no ${HYSTERIA_LINUX_AMD64_ASSET} asset`
-    );
+    throw new Error(`upstream release ${release.tag_name} has no ${assetName} asset`);
   }
   if (matches.length > 1) {
     throw new Error(
-      `upstream release ${release.tag_name} has ${matches.length} ambiguous ${HYSTERIA_LINUX_AMD64_ASSET} assets`
+      `upstream release ${release.tag_name} has ${matches.length} ambiguous ${assetName} assets`
     );
   }
 
@@ -93,11 +100,79 @@ export function selectLinuxAmd64Asset(release: GithubRelease): GithubAsset {
   return { name: matches[0].name, browser_download_url: url };
 }
 
+export function selectLinuxAmd64Asset(release: GithubRelease): GithubAsset {
+  return selectAssetByName(release, HYSTERIA_LINUX_AMD64_ASSET);
+}
+
+export function selectHashesAsset(release: GithubRelease): GithubAsset {
+  return selectAssetByName(release, HYSTERIA_HASHES_ASSET);
+}
+
+/**
+ * Разбирает upstream hashes.txt.
+ *
+ * Фактический формат релиза app/v2.12.2:
+ *
+ *   6493dfff…f94  build/hysteria-linux-amd64
+ *   f24f63be…189  build/hysteria-linux-amd64-avx
+ *
+ * Сопоставление идёт по базовому имени и строго на равенство: префикс
+ * `build/` — часть пути, а `hysteria-linux-amd64-avx` — другой артефакт,
+ * который не должен совпасть по prefix-match.
+ *
+ * Поддерживается и форма `sha256:<hex>`: если upstream когда-нибудь сменит
+ * стиль, сборка не должна падать на косметике.
+ */
+export function parseUpstreamHashes(text: string, assetName: string): string {
+  const candidates: string[] = [];
+
+  for (const rawLine of text.split(/\r?\n/)) {
+    const line = rawLine.trim();
+    if (!line || line.startsWith("#")) {
+      continue;
+    }
+
+    const columns = line.split(/\s+/).filter(Boolean);
+    if (columns.length < 2) {
+      continue;
+    }
+
+    const [first, ...rest] = columns;
+    const digest = first.toLowerCase().replace(/^sha256:/, "");
+    if (!/^[a-f0-9]{64}$/.test(digest)) {
+      continue;
+    }
+
+    const named = rest.some((column) => {
+      const basename = column.replace(/^\*/, "").split("/").pop() ?? "";
+      return basename === assetName;
+    });
+
+    if (named) {
+      candidates.push(digest);
+    }
+  }
+
+  if (candidates.length === 0) {
+    throw new Error(`upstream hashes.txt has no SHA-256 entry for ${assetName}`);
+  }
+
+  const unique = [...new Set(candidates)];
+  if (unique.length > 1) {
+    throw new Error(
+      `upstream hashes.txt has conflicting SHA-256 entries for ${assetName}: ${unique.join(", ")}`
+    );
+  }
+
+  return unique[0];
+}
+
 function toResolved(release: GithubRelease, version: string): ResolvedHysteriaRelease {
   return {
     version,
     tag: release.tag_name.trim(),
     artifactUrl: selectLinuxAmd64Asset(release).browser_download_url,
+    hashesUrl: selectHashesAsset(release).browser_download_url,
     publishedAt: (release.published_at ?? "").trim()
   };
 }
diff --git a/orchestrator/test/hysteria-release.test.ts b/orchestrator/test/hysteria-release.test.ts
index 678feaf..dde64f1 100644
--- a/orchestrator/test/hysteria-release.test.ts
+++ b/orchestrator/test/hysteria-release.test.ts
@@ -1,10 +1,13 @@
 import { describe, expect, test } from "bun:test";
 import {
+  HYSTERIA_HASHES_ASSET,
   HYSTERIA_LINUX_AMD64_ASSET,
   compareVersionParts,
   parseAppTag,
+  parseUpstreamHashes,
   parseVersion,
   renderLockEnv,
+  selectHashesAsset,
   selectLatestStableRelease,
   selectLinuxAmd64Asset,
   selectReleaseByVersion,
@@ -12,8 +15,15 @@ import {
 } from "../src/build/hysteriaRelease";
 
 /** Upstream отдаёт URL с неэкранированным слэшем в теге; берём его как есть. */
-function assetUrl(tag: string): string {
-  return `https://github.com/HyNetworks/hysteria/releases/download/${tag}/${HYSTERIA_LINUX_AMD64_ASSET}`;
+function assetUrl(tag: string, name = HYSTERIA_LINUX_AMD64_ASSET): string {
+  return `https://github.com/HyNetworks/hysteria/releases/download/${tag}/${name}`;
+}
+
+function defaultAssets(tag: string) {
+  return [
+    { name: HYSTERIA_LINUX_AMD64_ASSET, browser_download_url: assetUrl(tag) },
+    { name: HYSTERIA_HASHES_ASSET, browser_download_url: assetUrl(tag, HYSTERIA_HASHES_ASSET) }
+  ];
 }
 
 function release(tag: string, overrides: Partial<GithubRelease> = {}): GithubRelease {
@@ -22,7 +32,7 @@ function release(tag: string, overrides: Partial<GithubRelease> = {}): GithubRel
     draft: false,
     prerelease: false,
     published_at: "2026-08-23T00:59:00Z",
-    assets: [{ name: HYSTERIA_LINUX_AMD64_ASSET, browser_download_url: assetUrl(tag) }],
+    assets: defaultAssets(tag),
     ...overrides
   };
 }
@@ -98,11 +108,138 @@ describe("selectLatestStableRelease", () => {
     const encoded = "https://github.com/HyNetworks/hysteria/releases/download/app%2Fv2.12.2/hysteria-linux-amd64";
     const resolved = selectLatestStableRelease([
       release("app/v2.12.2", {
-        assets: [{ name: HYSTERIA_LINUX_AMD64_ASSET, browser_download_url: encoded }]
+        assets: [
+          { name: HYSTERIA_LINUX_AMD64_ASSET, browser_download_url: encoded },
+          {
+            name: HYSTERIA_HASHES_ASSET,
+            browser_download_url: assetUrl("app/v2.12.2", HYSTERIA_HASHES_ASSET)
+          }
+        ]
       })
     ]);
     expect(resolved.artifactUrl).toBe(encoded);
   });
+
+  test("резолв отдаёт и url ассета с контрольными суммами", () => {
+    const resolved = selectLatestStableRelease(UPSTREAM_FIXTURE);
+    expect(resolved.hashesUrl).toBe(
+      "https://github.com/HyNetworks/hysteria/releases/download/app/v2.12.2/hashes.txt"
+    );
+  });
+
+  // Без hashes.txt проверять происхождение артефакта нечем, поэтому такой
+  // релиз для production-сборки непригоден.
+  test("релиз без hashes.txt отклоняется", () => {
+    const noHashes = release("app/v2.12.2", {
+      assets: [{ name: HYSTERIA_LINUX_AMD64_ASSET, browser_download_url: assetUrl("app/v2.12.2") }]
+    });
+    expect(() => selectLatestStableRelease([noHashes])).toThrow(/has no hashes\.txt asset/);
+  });
+});
+
+describe("selectHashesAsset", () => {
+  test("находит ассет контрольных сумм", () => {
+    expect(selectHashesAsset(release("app/v2.12.2")).name).toBe(HYSTERIA_HASHES_ASSET);
+  });
+
+  test("дублирующийся hashes.txt — ошибка", () => {
+    const ambiguous = release("app/v2.12.2", {
+      assets: [
+        ...defaultAssets("app/v2.12.2"),
+        { name: HYSTERIA_HASHES_ASSET, browser_download_url: "https://example.com/evil" }
+      ]
+    });
+    expect(() => selectHashesAsset(ambiguous)).toThrow(/ambiguous/);
+  });
+});
+
+describe("parseUpstreamHashes", () => {
+  // Реальный формат релиза app/v2.12.2.
+  const UPSTREAM_HASHES = [
+    "6493dfffd55b5883f64c76c63880ecc32988f0c568c9ca9014907877b4d55f94  build/hysteria-linux-amd64",
+    "f24f63bece90b91b4e47d392f0afa4d8fe6d38785cca0589c1d121fd53b8e189  build/hysteria-linux-amd64-avx",
+    "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa  build/hysteria-linux-arm64"
+  ].join("\n");
+
+  test("достаёт сумму нужного артефакта", () => {
+    expect(parseUpstreamHashes(UPSTREAM_HASHES, HYSTERIA_LINUX_AMD64_ASSET)).toBe(
+      "6493dfffd55b5883f64c76c63880ecc32988f0c568c9ca9014907877b4d55f94"
+    );
+  });
+
+  // Ключевой момент: -avx не должен совпасть по префиксу с базовым артефактом.
+  test("не путает hysteria-linux-amd64 с hysteria-linux-amd64-avx", () => {
+    expect(parseUpstreamHashes(UPSTREAM_HASHES, HYSTERIA_LINUX_AMD64_ASSET)).not.toBe(
+      "f24f63bece90b91b4e47d392f0afa4d8fe6d38785cca0589c1d121fd53b8e189"
+    );
+    expect(parseUpstreamHashes(UPSTREAM_HASHES, "hysteria-linux-amd64-avx")).toBe(
+      "f24f63bece90b91b4e47d392f0afa4d8fe6d38785cca0589c1d121fd53b8e189"
+    );
+  });
+
+  test("работает без префикса каталога", () => {
+    const flat = `6493dfffd55b5883f64c76c63880ecc32988f0c568c9ca9014907877b4d55f94  ${HYSTERIA_LINUX_AMD64_ASSET}`;
+    expect(parseUpstreamHashes(flat, HYSTERIA_LINUX_AMD64_ASSET)).toBe(
+      "6493dfffd55b5883f64c76c63880ecc32988f0c568c9ca9014907877b4d55f94"
+    );
+  });
+
+  test("понимает форму sha256:<hex> и бинарный маркер '*'", () => {
+    const alternative = [
+      `sha256:6493dfffd55b5883f64c76c63880ecc32988f0c568c9ca9014907877b4d55f94 *${HYSTERIA_LINUX_AMD64_ASSET}`
+    ].join("\n");
+    expect(parseUpstreamHashes(alternative, HYSTERIA_LINUX_AMD64_ASSET)).toBe(
+      "6493dfffd55b5883f64c76c63880ecc32988f0c568c9ca9014907877b4d55f94"
+    );
+  });
+
+  test("верхний регистр нормализуется", () => {
+    const upper = `6493DFFFD55B5883F64C76C63880ECC32988F0C568C9CA9014907877B4D55F94  ${HYSTERIA_LINUX_AMD64_ASSET}`;
+    expect(parseUpstreamHashes(upper, HYSTERIA_LINUX_AMD64_ASSET)).toBe(
+      "6493dfffd55b5883f64c76c63880ecc32988f0c568c9ca9014907877b4d55f94"
+    );
+  });
+
+  test("комментарии и пустые строки игнорируются", () => {
+    const noisy = [
+      "# hysteria release checksums",
+      "",
+      `6493dfffd55b5883f64c76c63880ecc32988f0c568c9ca9014907877b4d55f94  build/${HYSTERIA_LINUX_AMD64_ASSET}`
+    ].join("\n");
+    expect(parseUpstreamHashes(noisy, HYSTERIA_LINUX_AMD64_ASSET)).toBe(
+      "6493dfffd55b5883f64c76c63880ecc32988f0c568c9ca9014907877b4d55f94"
+    );
+  });
+
+  test("отсутствие нужной строки — ошибка, а не тихий пропуск проверки", () => {
+    expect(() => parseUpstreamHashes(UPSTREAM_HASHES, "hysteria-linux-riscv64")).toThrow(
+      /no SHA-256 entry for hysteria-linux-riscv64/
+    );
+    expect(() => parseUpstreamHashes("", HYSTERIA_LINUX_AMD64_ASSET)).toThrow(/no SHA-256 entry/);
+  });
+
+  test("противоречивые записи — ошибка, а не выбор первой", () => {
+    const conflicting = [
+      `6493dfffd55b5883f64c76c63880ecc32988f0c568c9ca9014907877b4d55f94  build/${HYSTERIA_LINUX_AMD64_ASSET}`,
+      `bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb  dist/${HYSTERIA_LINUX_AMD64_ASSET}`
+    ].join("\n");
+    expect(() => parseUpstreamHashes(conflicting, HYSTERIA_LINUX_AMD64_ASSET)).toThrow(/conflicting/);
+  });
+
+  test("повторяющаяся одинаковая запись ошибкой не считается", () => {
+    const duplicated = [
+      `6493dfffd55b5883f64c76c63880ecc32988f0c568c9ca9014907877b4d55f94  build/${HYSTERIA_LINUX_AMD64_ASSET}`,
+      `6493dfffd55b5883f64c76c63880ecc32988f0c568c9ca9014907877b4d55f94  ${HYSTERIA_LINUX_AMD64_ASSET}`
+    ].join("\n");
+    expect(parseUpstreamHashes(duplicated, HYSTERIA_LINUX_AMD64_ASSET)).toBe(
+      "6493dfffd55b5883f64c76c63880ecc32988f0c568c9ca9014907877b4d55f94"
+    );
+  });
+
+  test("строка с мусором вместо digest игнорируется", () => {
+    const garbage = `not-a-sha  build/${HYSTERIA_LINUX_AMD64_ASSET}`;
+    expect(() => parseUpstreamHashes(garbage, HYSTERIA_LINUX_AMD64_ASSET)).toThrow(/no SHA-256 entry/);
+  });
 });
 
 describe("selectLinuxAmd64Asset", () => {
diff --git a/orchestrator/test/release-rollover.test.ts b/orchestrator/test/release-rollover.test.ts
index 01ffea4..46518f0 100644
--- a/orchestrator/test/release-rollover.test.ts
+++ b/orchestrator/test/release-rollover.test.ts
@@ -2,11 +2,16 @@ import { describe, expect, test } from "bun:test";
 import { readFileSync } from "node:fs";
 import { join } from "node:path";
 import {
+  HYSTERIA_HASHES_ASSET,
   HYSTERIA_LINUX_AMD64_ASSET,
   selectLatestStableRelease,
   type GithubRelease
 } from "../src/build/hysteriaRelease";
 
+function assetUrl(tag: string, name: string): string {
+  return `https://github.com/HyNetworks/hysteria/releases/download/${tag}/${name}`;
+}
+
 function release(tag: string): GithubRelease {
   return {
     tag_name: tag,
@@ -16,7 +21,11 @@ function release(tag: string): GithubRelease {
     assets: [
       {
         name: HYSTERIA_LINUX_AMD64_ASSET,
-        browser_download_url: `https://github.com/HyNetworks/hysteria/releases/download/${tag}/${HYSTERIA_LINUX_AMD64_ASSET}`
+        browser_download_url: assetUrl(tag, HYSTERIA_LINUX_AMD64_ASSET)
+      },
+      {
+        name: HYSTERIA_HASHES_ASSET,
+        browser_download_url: assetUrl(tag, HYSTERIA_HASHES_ASSET)
       }
     ]
   };
diff --git a/orchestrator/tools/parse-upstream-hashes.ts b/orchestrator/tools/parse-upstream-hashes.ts
new file mode 100644
index 0000000..82a5a13
--- /dev/null
+++ b/orchestrator/tools/parse-upstream-hashes.ts
@@ -0,0 +1,54 @@
+/**
+ * Build-time CLI: достаёт ожидаемый SHA-256 артефакта из upstream hashes.txt.
+ *
+ * Вынесено в отдельную команду, чтобы разбор формата жил в одном месте и был
+ * покрыт юнит-тестами, а не повторялся awk-выражением в bash.
+ *
+ *   bun run tools/parse-upstream-hashes.ts --file hashes.txt --asset hysteria-linux-amd64
+ */
+
+import { parseUpstreamHashes } from "../src/build/hysteriaRelease";
+
+function fail(message: string): never {
+  console.error(`[hy2xs-build] ERROR: ${message}`);
+  process.exit(1);
+}
+
+function parseArgs(argv: string[]): { file: string; asset: string } {
+  let file = "";
+  let asset = "";
+
+  for (let i = 0; i < argv.length; i += 1) {
+    const arg = argv[i];
+    const value = argv[i + 1];
+    if (arg === "--file") {
+      file = value ?? "";
+      i += 1;
+      continue;
+    }
+    if (arg === "--asset") {
+      asset = value ?? "";
+      i += 1;
+      continue;
+    }
+    fail(`unknown argument: ${arg}`);
+  }
+
+  if (!file) {
+    fail("missing --file");
+  }
+  if (!asset) {
+    fail("missing --asset");
+  }
+
+  return { file, asset };
+}
+
+const { file, asset } = parseArgs(Bun.argv.slice(2));
+
+try {
+  const text = await Bun.file(file).text();
+  process.stdout.write(`${parseUpstreamHashes(text, asset)}\n`);
+} catch (error) {
+  fail(error instanceof Error ? error.message : String(error));
+}
diff --git a/orchestrator/tools/resolve-hysteria.ts b/orchestrator/tools/resolve-hysteria.ts
index 271675e..04df27b 100644
--- a/orchestrator/tools/resolve-hysteria.ts
+++ b/orchestrator/tools/resolve-hysteria.ts
@@ -102,6 +102,7 @@ function emit(resolved: ResolvedHysteriaRelease, resolution: string): void {
   console.log(`HYSTERIA_VERSION=${resolved.version}`);
   console.log(`HYSTERIA_TAG=${resolved.tag}`);
   console.log(`HYSTERIA_ARTIFACT_URL=${resolved.artifactUrl}`);
+  console.log(`HYSTERIA_HASHES_URL=${resolved.hashesUrl}`);
   console.log(`HYSTERIA_PUBLISHED_AT=${resolved.publishedAt}`);
   console.log(`HYSTERIA_RESOLUTION=${resolution}`);
 }
diff --git a/tools/build/hysteria-lock.env b/tools/build/hysteria-lock.env
index 40b08f6..1a23731 100644
--- a/tools/build/hysteria-lock.env
+++ b/tools/build/hysteria-lock.env
@@ -3,5 +3,6 @@
 HYSTERIA_VERSION=v2.12.2
 HYSTERIA_ARTIFACT_URL=https://github.com/HyNetworks/hysteria/releases/download/app/v2.12.2/hysteria-linux-amd64
 HYSTERIA_ARTIFACT_SHA256=6493dfffd55b5883f64c76c63880ecc32988f0c568c9ca9014907877b4d55f94
+HYSTERIA_SHA_SOURCE=upstream-hashes
 HYSTERIA_RESOLUTION=latest-stable
 HYSTERIA_RESOLVED_AT=2026-08-27T00:00:00Z
diff --git a/tools/build/lib/hysteria.sh b/tools/build/lib/hysteria.sh
index 56f0526..cfe0fbe 100644
--- a/tools/build/lib/hysteria.sh
+++ b/tools/build/lib/hysteria.sh
@@ -18,6 +18,11 @@ HYSTERIA_VERSION_OVERRIDE="${HYSTERIA_VERSION_OVERRIDE:-}"
 HYSTERIA_WRITE_LOCK="${HYSTERIA_WRITE_LOCK:-false}"
 # Compatibility gate обязателен для production-сборки.
 HYSTERIA_COMPAT_GATE="${HYSTERIA_COMPAT_GATE:-true}"
+# Сверка скачанного бинарника с upstream hashes.txt. Отключается только
+# break-glass: без неё SHA-256 считается от уже скачанного файла и является
+# trust-on-first-use, а не проверкой происхождения артефакта.
+HYSTERIA_VERIFY_UPSTREAM_HASHES="${HYSTERIA_VERIFY_UPSTREAM_HASHES:-true}"
+HYSTERIA_LINUX_AMD64_ASSET="hysteria-linux-amd64"
 
 HYSTERIA_GATE_PORT="${HYSTERIA_GATE_PORT:-34443}"
 HYSTERIA_GATE_STATS_PORT="${HYSTERIA_GATE_STATS_PORT:-34712}"
@@ -55,8 +60,12 @@ load_pinned_hysteria_lock() {
 
   HYSTERIA_RESOLUTION="pinned"
   HYSTERIA_RESOLVED_AT="${HYSTERIA_RESOLVED_AT:-unknown}"
+  # Сумма в lock-файле уже была проверена против upstream hashes.txt в тот
+  # момент, когда lock записывался.
+  HYSTERIA_SHA_SOURCE="hy2xs-lock"
 
-  export HYSTERIA_VERSION HYSTERIA_ARTIFACT_URL HYSTERIA_ARTIFACT_SHA256 HYSTERIA_RESOLUTION HYSTERIA_RESOLVED_AT
+  export HYSTERIA_VERSION HYSTERIA_ARTIFACT_URL HYSTERIA_ARTIFACT_SHA256
+  export HYSTERIA_RESOLUTION HYSTERIA_RESOLVED_AT HYSTERIA_SHA_SOURCE
 }
 
 resolve_hysteria_from_upstream() {
@@ -77,6 +86,7 @@ resolve_hysteria_from_upstream() {
   HYSTERIA_VERSION=""
   HYSTERIA_TAG=""
   HYSTERIA_ARTIFACT_URL=""
+  HYSTERIA_HASHES_URL=""
   HYSTERIA_PUBLISHED_AT=""
   HYSTERIA_RESOLUTION=""
 
@@ -88,6 +98,7 @@ resolve_hysteria_from_upstream() {
       HYSTERIA_VERSION) HYSTERIA_VERSION="$value" ;;
       HYSTERIA_TAG) HYSTERIA_TAG="$value" ;;
       HYSTERIA_ARTIFACT_URL) HYSTERIA_ARTIFACT_URL="$value" ;;
+      HYSTERIA_HASHES_URL) HYSTERIA_HASHES_URL="$value" ;;
       HYSTERIA_PUBLISHED_AT) HYSTERIA_PUBLISHED_AT="$value" ;;
       HYSTERIA_RESOLUTION) HYSTERIA_RESOLUTION="$value" ;;
       *) fail "unexpected resolver output line: $line" ;;
@@ -96,14 +107,50 @@ resolve_hysteria_from_upstream() {
 
   [ -n "$HYSTERIA_VERSION" ] || fail "resolver did not return HYSTERIA_VERSION"
   [ -n "$HYSTERIA_ARTIFACT_URL" ] || fail "resolver did not return HYSTERIA_ARTIFACT_URL"
+  [ -n "$HYSTERIA_HASHES_URL" ] || fail "resolver did not return HYSTERIA_HASHES_URL"
   validate_hysteria_version_format "$HYSTERIA_VERSION"
 
   HYSTERIA_RESOLVED_AT="$(date -u +%Y-%m-%dT%H:%M:%SZ)"
 
   log_info "Resolved Hysteria $HYSTERIA_VERSION (tag ${HYSTERIA_TAG:-unknown}, published ${HYSTERIA_PUBLISHED_AT:-unknown})"
 
-  export HYSTERIA_VERSION HYSTERIA_TAG HYSTERIA_ARTIFACT_URL HYSTERIA_PUBLISHED_AT
-  export HYSTERIA_RESOLUTION HYSTERIA_RESOLVED_AT
+  export HYSTERIA_VERSION HYSTERIA_TAG HYSTERIA_ARTIFACT_URL HYSTERIA_HASHES_URL
+  export HYSTERIA_PUBLISHED_AT HYSTERIA_RESOLUTION HYSTERIA_RESOLVED_AT
+}
+
+# Ожидаемый digest берётся из upstream-ассета hashes.txt ДО того, как он
+# попадёт в HY2XS lock. Иначе замороженная сумма подтверждает только то, что
+# файл не изменился после скачивания.
+resolve_expected_sha_from_upstream() {
+  [ "$HYSTERIA_VERIFY_UPSTREAM_HASHES" = "true" ] || {
+    log_info "WARNING: upstream hashes.txt verification is disabled (HYSTERIA_VERIFY_UPSTREAM_HASHES=$HYSTERIA_VERIFY_UPSTREAM_HASHES)"
+    return 0
+  }
+
+  [ -n "${HYSTERIA_HASHES_URL:-}" ] || fail "upstream hashes.txt URL is unknown"
+
+  mkdir -p "$HYSTERIA_WORK_DIR"
+  local hashes_file="$HYSTERIA_WORK_DIR/hashes.txt"
+
+  log_info "Downloading upstream checksums: $HYSTERIA_HASHES_URL"
+  rm -f "$hashes_file"
+  curl --proto '=https' --tlsv1.2 --fail --silent --show-error --location \
+    "$HYSTERIA_HASHES_URL" -o "$hashes_file" \
+    || fail "failed to download upstream hashes.txt: $HYSTERIA_HASHES_URL"
+  [ -s "$hashes_file" ] || fail "downloaded upstream hashes.txt is empty"
+
+  local upstream_sha
+  upstream_sha="$(cd orchestrator && "$BUN_BIN" run tools/parse-upstream-hashes.ts \
+    --file "../$hashes_file" --asset "$HYSTERIA_LINUX_AMD64_ASSET")" \
+    || fail "could not read the expected SHA-256 from upstream hashes.txt"
+
+  validate_hysteria_sha256_format "$upstream_sha"
+
+  HYSTERIA_ARTIFACT_SHA256="$upstream_sha"
+  HYSTERIA_SHA_SOURCE="upstream-hashes"
+  export HYSTERIA_ARTIFACT_SHA256 HYSTERIA_SHA_SOURCE
+
+  log_info "Expected Hysteria SHA-256 from upstream hashes.txt: $upstream_sha"
 }
 
 download_hysteria_artifact() {
@@ -123,13 +170,17 @@ download_hysteria_artifact() {
   if [ -n "${HYSTERIA_ARTIFACT_SHA256:-}" ]; then
     validate_hysteria_sha256_format "$HYSTERIA_ARTIFACT_SHA256"
     [ "$actual_sha" = "$HYSTERIA_ARTIFACT_SHA256" ] \
-      || fail "Hysteria artifact sha256 mismatch: expected $HYSTERIA_ARTIFACT_SHA256, got $actual_sha"
+      || fail "Hysteria artifact sha256 mismatch: expected $HYSTERIA_ARTIFACT_SHA256 (${HYSTERIA_SHA_SOURCE:-unknown source}), got $actual_sha"
+    log_info "Hysteria artifact verified against ${HYSTERIA_SHA_SOURCE:-unknown source}: $actual_sha"
   else
+    # Сюда попадаем только при выключенной сверке с upstream: сумма
+    # фиксируется как локальный fingerprint пакета, без проверки происхождения.
     HYSTERIA_ARTIFACT_SHA256="$actual_sha"
-    log_info "Computed Hysteria artifact sha256: $HYSTERIA_ARTIFACT_SHA256"
+    HYSTERIA_SHA_SOURCE="local-download"
+    log_info "Computed Hysteria artifact sha256 without upstream verification: $HYSTERIA_ARTIFACT_SHA256"
   fi
 
-  export HYSTERIA_ARTIFACT_SHA256 HYSTERIA_BINARY
+  export HYSTERIA_ARTIFACT_SHA256 HYSTERIA_BINARY HYSTERIA_SHA_SOURCE
 
   chmod 0755 "$HYSTERIA_BINARY"
 
@@ -255,6 +306,7 @@ write_hysteria_lock_file() {
 HYSTERIA_VERSION=$HYSTERIA_VERSION
 HYSTERIA_ARTIFACT_URL=$HYSTERIA_ARTIFACT_URL
 HYSTERIA_ARTIFACT_SHA256=$HYSTERIA_ARTIFACT_SHA256
+HYSTERIA_SHA_SOURCE=${HYSTERIA_SHA_SOURCE:-unknown}
 HYSTERIA_RESOLUTION=$HYSTERIA_RESOLUTION
 HYSTERIA_RESOLVED_AT=$HYSTERIA_RESOLVED_AT
 EOF
@@ -264,8 +316,11 @@ resolve_and_verify_hysteria() {
   case "$HYSTERIA_CHANNEL" in
     stable)
       resolve_hysteria_from_upstream
-      # sha256 считается локально от скачанного артефакта
+      # Ожидаемая сумма приходит из upstream hashes.txt, а не из локального
+      # файла: проверяется происхождение артефакта, а не только целостность.
       HYSTERIA_ARTIFACT_SHA256=""
+      HYSTERIA_SHA_SOURCE=""
+      resolve_expected_sha_from_upstream
       ;;
     pinned)
       log_info "Using pinned Hysteria lock file (offline): $HYSTERIA_LOCK_FILE"