diff --git a/.github/workflows/canary.yml b/.github/workflows/canary.yml
index 86c7358ef0..ae0fc3a90d 100644
--- a/.github/workflows/canary.yml
+++ b/.github/workflows/canary.yml
@@ -1,31 +1,29 @@
-# Canary channels: single Release+LTO build per platform (Windows x64,
-# universal macOS, Linux x64 through docker), for both the public and the
-# private canary channel, signed, packed as v2 updates and published via
-# a local Bot API server.
+# Canary channel: single Release+LTO build per platform (Windows x64,
+# universal macOS, Linux x64 through docker), signed, packed as v2
+# updates and published via a local Bot API server.
+#
+# Each repository builds exactly ONE lane. The lane follows repository
+# visibility (public repo -> canary-public, private repo ->
+# canary-private) and can be overridden with the repository variable
+# CANARY_CHANNEL ("public" or "private"); the private lane refuses to
+# run from a public repository no matter what. A repository holds only
+# its own lane's secrets.
 #
 # Infrastructure this workflow needs before its first real run, all under
 # the 'canary' environment unless noted. Placeholders, do not invent values:
 #
+# Both repositories:
+#   vars.CANARY_CHANNEL
+#       Optional lane override, see above. Normally left unset.
 #   secrets.CANARY_API_ID / secrets.CANARY_API_HASH
 #       Production Telegram API credentials for the canary app builds.
 #   secrets.CANARY_BOT_TOKEN
-#       Bot admin in both canary channels (posts files, edits metadata).
-#   secrets.CANARY_PUBLIC_CHANNEL_ID
-#       Numeric -100... public channel id for the Bot API calls.
-#   secrets.CANARY_PRIVATE_CHANNEL_ID
-#       Bare numeric id of the private channel (no -100 prefix), also
-#       compiled into canary-private builds for discovery.
-#   vars.CANARY_PUBLIC_CHANNEL_USERNAME
-#       Public channel username compiled into canary-public builds.
-#   vars.CANARY_METADATA_MSG_ID / vars.CANARY_PRIVATE_METADATA_MSG_ID
-#       Fixed ids of the pinned metadata messages in the two channels.
+#       Bot admin in this lane's channel (posts files, edits metadata).
 #   secrets.AZURE_CLIENT_ID / secrets.AZURE_TENANT_ID
-#       Entra federated credential for OIDC az login (id-token: write).
+#       This lane's Entra federated credential for OIDC az login
+#       (id-token: write).
 #   secrets.AZURE_KEYVAULT_NAME
-#       Key Vault holding the canary ES256 keys.
-#   vars.CANARY_SIGNING_KEY_ID / vars.CANARY_PRIVATE_SIGNING_KEY_ID
-#       Key Vault key names, must match the manifest ids
-#       ("cp-2026a" / "cx-2026a").
+#       Key Vault holding this lane's canary ES256 key.
 #   secrets.SM_API_KEY / secrets.SM_CLIENT_CERT_FILE_B64 /
 #   secrets.SM_CLIENT_CERT_PASSWORD / secrets.SM_HOST /
 #   secrets.SM_KEYPAIR_ALIAS
@@ -39,6 +37,25 @@
 #   secrets.R2_SECRET_ACCESS_KEY / vars.R2_SYMBOLS_BUCKET
 #       Cloudflare R2 bucket for breakpad symbols (upload placeholder).
 #
+# Public repository only:
+#   secrets.CANARY_PUBLIC_CHANNEL_ID
+#       Numeric -100... public channel id for the Bot API calls.
+#   vars.CANARY_PUBLIC_CHANNEL_USERNAME
+#       Public channel username compiled into canary-public builds.
+#   vars.CANARY_METADATA_MSG_ID
+#       Fixed id of the pinned metadata message in the public channel.
+#   vars.CANARY_SIGNING_KEY_ID
+#       Key Vault key name, must match the manifest id ("cp-2026a").
+#
+# Private repository only:
+#   secrets.CANARY_PRIVATE_CHANNEL_ID
+#       Bare numeric id of the private channel (no -100 prefix), also
+#       compiled into canary-private builds for discovery.
+#   vars.CANARY_PRIVATE_METADATA_MSG_ID
+#       Fixed id of the pinned metadata message in the private channel.
+#   vars.CANARY_PRIVATE_SIGNING_KEY_ID
+#       Key Vault key name, must match the manifest id ("cx-2026a").
+#
 # Publishing no-ops cleanly while CANARY_BOT_TOKEN is absent, so the
 # workflow can run before the bots/channels/KeyLocker exist.
 
@@ -65,12 +82,11 @@ jobs:
     environment: canary
 
     outputs:
+      channel: ${{ steps.compute.outputs.channel }}
       base: ${{ steps.compute.outputs.base }}
       commit: ${{ steps.compute.outputs.commit }}
-      counter_public: ${{ steps.compute.outputs.counter_public }}
-      counter_private: ${{ steps.compute.outputs.counter_private }}
-      previous_public: ${{ steps.compute.outputs.previous_public }}
-      previous_private: ${{ steps.compute.outputs.previous_private }}
+      counter: ${{ steps.compute.outputs.counter }}
+      previous: ${{ steps.compute.outputs.previous }}
       publish: ${{ steps.compute.outputs.publish }}
 
     steps:
@@ -81,13 +97,41 @@ jobs:
           # must survive force-pushes and rebases of the canary branch.
           fetch-depth: 0
 
-      - name: Compute canary versions.
+      - name: Compute canary version.
         id: compute
         env:
           BOT_TOKEN: ${{ secrets.CANARY_BOT_TOKEN }}
           PUBLIC_CHANNEL: ${{ secrets.CANARY_PUBLIC_CHANNEL_ID }}
           PRIVATE_CHANNEL: ${{ secrets.CANARY_PRIVATE_CHANNEL_ID }}
+          CHANNEL_OVERRIDE: ${{ vars.CANARY_CHANNEL }}
+          REPO_IS_PRIVATE: ${{ github.event.repository.private }}
         run: |
+          CHANNEL="$CHANNEL_OVERRIDE"
+          if [ -z "$CHANNEL" ]; then
+            if [ "$REPO_IS_PRIVATE" = "true" ]; then
+              CHANNEL=private
+            else
+              CHANNEL=public
+            fi
+          fi
+          case "$CHANNEL" in
+            public|private) ;;
+            *)
+              echo "::error::Bad CANARY_CHANNEL value '$CHANNEL'."
+              exit 1
+              ;;
+          esac
+          if [ "$CHANNEL" = "private" ] && [ "$REPO_IS_PRIVATE" != "true" ]; then
+            echo "::error::The private canary lane only builds from the private repository."
+            exit 1
+          fi
+          echo "channel=$CHANNEL" >> $GITHUB_OUTPUT
+          if [ "$CHANNEL" = "public" ]; then
+            CHAT_ID="$PUBLIC_CHANNEL"
+          else
+            CHAT_ID="-100$PRIVATE_CHANNEL"
+          fi
+
           while IFS=' ' read -r name value; do
             [ "$name" = "AppVersion" ] && BASE="$value"
           done < Telegram/build/version
@@ -100,40 +144,33 @@ jobs:
           fi
           echo "publish=$PUBLISH" >> $GITHUB_OUTPUT
 
-          compute_counter() { # $1 = chat id, $2 = channel name, $3 = suffix
-            local COUNTER=1
-            local PREVIOUS=""
-            if [ "$PUBLISH" = "true" ] && [ -n "$1" ]; then
-              local PINNED=$(curl -sf "https://api.telegram.org/bot$BOT_TOKEN/getChat?chat_id=$1" \
-                | jq -r '.result.pinned_message.text // empty')
-              if [ -n "$PINNED" ]; then
-                local OLD_BASE=$(echo "$PINNED" | jq -r ".channels.\"$2\".base // 0")
-                local OLD_COUNTER=$(echo "$PINNED" | jq -r ".channels.\"$2\".counter // 0")
-                PREVIOUS=$(echo "$PINNED" | jq -r ".channels.\"$2\".commit // empty")
-                if [ "$OLD_BASE" = "$BASE" ]; then
-                  COUNTER=$((OLD_COUNTER + 1))
-                fi
+          COUNTER=1
+          PREVIOUS=""
+          if [ "$PUBLISH" = "true" ] && [ -n "$CHAT_ID" ] && [ "$CHAT_ID" != "-100" ]; then
+            PINNED=$(curl -sf "https://api.telegram.org/bot$BOT_TOKEN/getChat?chat_id=$CHAT_ID" \
+              | jq -r '.result.pinned_message.text // empty')
+            if [ -n "$PINNED" ]; then
+              OLD_BASE=$(echo "$PINNED" | jq -r ".channels.\"canary-$CHANNEL\".base // 0")
+              OLD_COUNTER=$(echo "$PINNED" | jq -r ".channels.\"canary-$CHANNEL\".counter // 0")
+              PREVIOUS=$(echo "$PINNED" | jq -r ".channels.\"canary-$CHANNEL\".commit // empty")
+              if [ "$OLD_BASE" = "$BASE" ]; then
+                COUNTER=$((OLD_COUNTER + 1))
               fi
             fi
-            echo "counter_$3=$COUNTER" >> $GITHUB_OUTPUT
-            echo "previous_$3=$PREVIOUS" >> $GITHUB_OUTPUT
-            echo "canary-$3: $BASE #$COUNTER"
-          }
-          compute_counter "$PUBLIC_CHANNEL" "canary-public" public
-          compute_counter "-100$PRIVATE_CHANNEL" "canary-private" private
+          fi
+          echo "counter=$COUNTER" >> $GITHUB_OUTPUT
+          echo "previous=$PREVIOUS" >> $GITHUB_OUTPUT
+          echo "Canary lane: canary-$CHANNEL, version $BASE #$COUNTER (publish: $PUBLISH)"
 
   windows:
-    name: Windows x64 (${{ matrix.channel }})
+    name: Windows x64 (${{ needs.version.outputs.channel }})
     runs-on: depot-windows-latest-16
     needs: version
     environment: canary
 
-    strategy:
-      matrix:
-        channel: [public, private]
-        # win-arm64 is phase 2: add an arch dimension here together with
-        # the windows-11-arm runner and the VS ARM64 build tools steps
-        # from win.yml when the canary channels grow an arm feed.
+    # win-arm64 is phase 2: add an arch matrix here together with the
+    # windows-11-arm runner and the VS ARM64 build tools steps from
+    # win.yml when the canary channels grow an arm feed.
 
     env:
       PREPARE_PATH: "Telegram/build/prepare/prepare.py"
@@ -163,14 +200,13 @@ jobs:
       - name: Read canary configuration.
         shell: bash
         run: |
-          if [ "${{ matrix.channel }}" = "public" ]; then
+          echo "CANARY_COUNTER=${{ needs.version.outputs.counter }}" >> $GITHUB_ENV
+          if [ "${{ needs.version.outputs.channel }}" = "public" ]; then
             echo "CANARY_TAG=canarypub" >> $GITHUB_ENV
-            echo "CANARY_COUNTER=${{ needs.version.outputs.counter_public }}" >> $GITHUB_ENV
             echo "CANARY_KEY_ID=${{ vars.CANARY_SIGNING_KEY_ID }}" >> $GITHUB_ENV
             echo "CANARY_DEFINES=-D TDESKTOP_UPDATE_CHANNEL=canary-public -D TDESKTOP_CANARY_PUBLIC_CHANNEL=${{ vars.CANARY_PUBLIC_CHANNEL_USERNAME }} -D TDESKTOP_CANARY_METADATA_MSG_ID=${{ vars.CANARY_METADATA_MSG_ID }}" >> $GITHUB_ENV
           else
             echo "CANARY_TAG=canarypriv" >> $GITHUB_ENV
-            echo "CANARY_COUNTER=${{ needs.version.outputs.counter_private }}" >> $GITHUB_ENV
             echo "CANARY_KEY_ID=${{ vars.CANARY_PRIVATE_SIGNING_KEY_ID }}" >> $GITHUB_ENV
             echo "CANARY_DEFINES=-D TDESKTOP_UPDATE_CHANNEL=canary-private -D TDESKTOP_CANARY_PRIVATE_CHANNEL_ID=${{ secrets.CANARY_PRIVATE_CHANNEL_ID }} -D TDESKTOP_CANARY_METADATA_MSG_ID=${{ vars.CANARY_PRIVATE_METADATA_MSG_ID }}" >> $GITHUB_ENV
           fi
@@ -330,7 +366,7 @@ jobs:
           ./Packer.exe -path Telegram.exe -path Updater.exe \
             -target win64 \
             -version ${{ needs.version.outputs.base }} \
-            -channel canary-${{ matrix.channel }} \
+            -channel canary-${{ needs.version.outputs.channel }} \
             -counter $CANARY_COUNTER \
             -keys-loc ../../Telegram/Resources/update \
             -emit-signing-input signing-input.bin
@@ -340,7 +376,7 @@ jobs:
               --output canary.sig \
               --az-vault "${{ secrets.AZURE_KEYVAULT_NAME }}" \
               --az-key "$CANARY_KEY_ID"
-            ./Packer.exe -channel canary-${{ matrix.channel }} \
+            ./Packer.exe -channel canary-${{ needs.version.outputs.channel }} \
               -keys-loc ../../Telegram/Resources/update \
               -unsigned tv2-win64-$CANARY_TAG-${{ needs.version.outputs.base }}-$CANARY_COUNTER.unsigned \
               -embed-signatures $CANARY_KEY_ID:canary.sig
@@ -354,19 +390,15 @@ jobs:
       - uses: actions/upload-artifact@v7
         name: Upload artifact.
         with:
-          name: canary-${{ matrix.channel }}-win64
+          name: canary-win64
           path: ${{ env.TBUILD }}\${{ env.REPO_NAME }}\out\Release\artifact\
 
   macos:
-    name: macOS universal (${{ matrix.channel }})
+    name: macOS universal (${{ needs.version.outputs.channel }})
     runs-on: depot-macos-latest
     needs: version
     environment: canary
 
-    strategy:
-      matrix:
-        channel: [public, private]
-
     env:
       PREPARE_PATH: "Telegram/build/prepare/prepare.py"
 
@@ -382,14 +414,13 @@ jobs:
 
       - name: Read canary configuration.
         run: |
-          if [ "${{ matrix.channel }}" = "public" ]; then
+          echo "CANARY_COUNTER=${{ needs.version.outputs.counter }}" >> $GITHUB_ENV
+          if [ "${{ needs.version.outputs.channel }}" = "public" ]; then
             echo "CANARY_TAG=canarypub" >> $GITHUB_ENV
-            echo "CANARY_COUNTER=${{ needs.version.outputs.counter_public }}" >> $GITHUB_ENV
             echo "CANARY_KEY_ID=${{ vars.CANARY_SIGNING_KEY_ID }}" >> $GITHUB_ENV
             echo "CANARY_DEFINES=-D TDESKTOP_UPDATE_CHANNEL=canary-public -D TDESKTOP_CANARY_PUBLIC_CHANNEL=${{ vars.CANARY_PUBLIC_CHANNEL_USERNAME }} -D TDESKTOP_CANARY_METADATA_MSG_ID=${{ vars.CANARY_METADATA_MSG_ID }}" >> $GITHUB_ENV
           else
             echo "CANARY_TAG=canarypriv" >> $GITHUB_ENV
-            echo "CANARY_COUNTER=${{ needs.version.outputs.counter_private }}" >> $GITHUB_ENV
             echo "CANARY_KEY_ID=${{ vars.CANARY_PRIVATE_SIGNING_KEY_ID }}" >> $GITHUB_ENV
             echo "CANARY_DEFINES=-D TDESKTOP_UPDATE_CHANNEL=canary-private -D TDESKTOP_CANARY_PRIVATE_CHANNEL_ID=${{ secrets.CANARY_PRIVATE_CHANNEL_ID }} -D TDESKTOP_CANARY_METADATA_MSG_ID=${{ vars.CANARY_PRIVATE_METADATA_MSG_ID }}" >> $GITHUB_ENV
           fi
@@ -523,7 +554,7 @@ jobs:
           cd $REPO_NAME/out/Release
           ./Packer -path Telegram.app \
             -version ${{ needs.version.outputs.base }} \
-            -channel canary-${{ matrix.channel }} \
+            -channel canary-${{ needs.version.outputs.channel }} \
             -counter $CANARY_COUNTER \
             -keys-loc ../../Telegram/Resources/update \
             -emit-signing-input signing-input.bin
@@ -533,7 +564,7 @@ jobs:
               --output canary.sig \
               --az-vault "${{ secrets.AZURE_KEYVAULT_NAME }}" \
               --az-key "$CANARY_KEY_ID"
-            ./Packer -channel canary-${{ matrix.channel }} \
+            ./Packer -channel canary-${{ needs.version.outputs.channel }} \
               -keys-loc ../../Telegram/Resources/update \
               -unsigned tv2-mac-$CANARY_TAG-${{ needs.version.outputs.base }}-$CANARY_COUNTER.unsigned \
               -embed-signatures $CANARY_KEY_ID:canary.sig
@@ -547,19 +578,15 @@ jobs:
       - uses: actions/upload-artifact@v7
         name: Upload artifact.
         with:
-          name: canary-${{ matrix.channel }}-mac
+          name: canary-mac
           path: ${{ env.REPO_NAME }}/out/Release/artifact/
 
   linux:
-    name: Linux x64 (${{ matrix.channel }})
+    name: Linux x64 (${{ needs.version.outputs.channel }})
     runs-on: depot-ubuntu-latest-16
     needs: version
     environment: canary
 
-    strategy:
-      matrix:
-        channel: [public, private]
-
     env:
       IMAGE_TAG: tdesktop:centos_env
 
@@ -571,14 +598,13 @@ jobs:
 
       - name: Read canary configuration.
         run: |
-          if [ "${{ matrix.channel }}" = "public" ]; then
+          echo "CANARY_COUNTER=${{ needs.version.outputs.counter }}" >> $GITHUB_ENV
+          if [ "${{ needs.version.outputs.channel }}" = "public" ]; then
             echo "CANARY_TAG=canarypub" >> $GITHUB_ENV
-            echo "CANARY_COUNTER=${{ needs.version.outputs.counter_public }}" >> $GITHUB_ENV
             echo "CANARY_KEY_ID=${{ vars.CANARY_SIGNING_KEY_ID }}" >> $GITHUB_ENV
             echo "CANARY_DEFINES=-D TDESKTOP_UPDATE_CHANNEL=canary-public -D TDESKTOP_CANARY_PUBLIC_CHANNEL=${{ vars.CANARY_PUBLIC_CHANNEL_USERNAME }} -D TDESKTOP_CANARY_METADATA_MSG_ID=${{ vars.CANARY_METADATA_MSG_ID }}" >> $GITHUB_ENV
           else
             echo "CANARY_TAG=canarypriv" >> $GITHUB_ENV
-            echo "CANARY_COUNTER=${{ needs.version.outputs.counter_private }}" >> $GITHUB_ENV
             echo "CANARY_KEY_ID=${{ vars.CANARY_PRIVATE_SIGNING_KEY_ID }}" >> $GITHUB_ENV
             echo "CANARY_DEFINES=-D TDESKTOP_UPDATE_CHANNEL=canary-private -D TDESKTOP_CANARY_PRIVATE_CHANNEL_ID=${{ secrets.CANARY_PRIVATE_CHANNEL_ID }} -D TDESKTOP_CANARY_METADATA_MSG_ID=${{ vars.CANARY_PRIVATE_METADATA_MSG_ID }}" >> $GITHUB_ENV
           fi
@@ -692,7 +718,7 @@ jobs:
           cd out/Release
           ./Packer -path Telegram -path Updater \
             -version ${{ needs.version.outputs.base }} \
-            -channel canary-${{ matrix.channel }} \
+            -channel canary-${{ needs.version.outputs.channel }} \
             -counter $CANARY_COUNTER \
             -keys-loc ../../Telegram/Resources/update \
             -emit-signing-input signing-input.bin
@@ -702,7 +728,7 @@ jobs:
               --output canary.sig \
               --az-vault "${{ secrets.AZURE_KEYVAULT_NAME }}" \
               --az-key "$CANARY_KEY_ID"
-            ./Packer -channel canary-${{ matrix.channel }} \
+            ./Packer -channel canary-${{ needs.version.outputs.channel }} \
               -keys-loc ../../Telegram/Resources/update \
               -unsigned tv2-linux-$CANARY_TAG-${{ needs.version.outputs.base }}-$CANARY_COUNTER.unsigned \
               -embed-signatures $CANARY_KEY_ID:canary.sig
@@ -716,11 +742,11 @@ jobs:
       - uses: actions/upload-artifact@v7
         name: Upload artifact.
         with:
-          name: canary-${{ matrix.channel }}-linux
+          name: canary-linux
           path: out/Release/artifact/
 
   publish:
-    name: Publish
+    name: Publish (${{ needs.version.outputs.channel }})
     runs-on: ubuntu-latest
     needs: [version, windows, macos, linux]
     if: needs.version.outputs.publish == 'true'
@@ -758,105 +784,102 @@ jobs:
           sudo apt-get update && sudo apt-get install -y osslsigncode
           FAILED=0
 
-          for CHANNEL in public private; do
-            for EXE in Telegram.exe Updater.exe; do
-              if ! osslsigncode verify "artifacts/canary-$CHANNEL-win64/$EXE"; then
-                echo "::error::canary-$CHANNEL $EXE is not Authenticode-signed."
-                FAILED=1
-              fi
-            done
-
-            # TODO(canary-infra): pin an apple-codesign (rcodesign) release
-            # for full macOS signature+staple verification on Linux:
-            #   rcodesign verify artifacts/canary-$CHANNEL-mac/Telegram.app
-            if [ ! -d "artifacts/canary-$CHANNEL-mac/Telegram.app/Contents/_CodeSignature" ]; then
-              echo "::error::canary-$CHANNEL Telegram.app has no code signature."
+          for EXE in Telegram.exe Updater.exe; do
+            if ! osslsigncode verify "artifacts/canary-win64/$EXE"; then
+              echo "::error::$EXE is not Authenticode-signed."
               FAILED=1
             fi
           done
 
+          # TODO(canary-infra): pin an apple-codesign (rcodesign) release
+          # for full macOS signature+staple verification on Linux:
+          #   rcodesign verify artifacts/canary-mac/Telegram.app
+          if [ ! -d "artifacts/canary-mac/Telegram.app/Contents/_CodeSignature" ]; then
+            echo "::error::Telegram.app has no code signature."
+            FAILED=1
+          fi
+
           exit $FAILED
 
-      - name: Publish both channels.
+      - name: Publish the channel.
         env:
+          CHANNEL: ${{ needs.version.outputs.channel }}
           PUBLIC_CHANNEL: ${{ secrets.CANARY_PUBLIC_CHANNEL_ID }}
           PRIVATE_CHANNEL: ${{ secrets.CANARY_PRIVATE_CHANNEL_ID }}
           PUBLIC_MSG_ID: ${{ vars.CANARY_METADATA_MSG_ID }}
           PRIVATE_MSG_ID: ${{ vars.CANARY_PRIVATE_METADATA_MSG_ID }}
         run: |
+          if [ "$CHANNEL" = "public" ]; then
+            CHAT_ID="$PUBLIC_CHANNEL"
+            MSG_ID="$PUBLIC_MSG_ID"
+          else
+            CHAT_ID="-100$PRIVATE_CHANNEL"
+            MSG_ID="$PRIVATE_MSG_ID"
+          fi
+          COUNTER="${{ needs.version.outputs.counter }}"
+          PREVIOUS="${{ needs.version.outputs.previous }}"
+
+          CAPTION=$({
+            echo "Canary #$COUNTER · ${{ needs.version.outputs.commit }}"
+            echo ""
+            if [ -n "$PREVIOUS" ] && git cat-file -e "$PREVIOUS^{commit}" 2>/dev/null; then
+              git log --no-merges --pretty=format:'• %s' "$PREVIOUS..HEAD" | head -20
+            else
+              git log --no-merges --pretty=format:'• %s' -10
+            fi
+          } | head -c 1000)
+
+          declare -A POSTS
+          for PLATFORM in win64 mac linux; do
+            FILE=$(ls artifacts/canary-$PLATFORM/tv2-* | head -1)
+            if [[ "$FILE" == *.unsigned ]]; then
+              echo "::error::$PLATFORM update is unsigned, refusing to publish."
+              exit 1
+            fi
+            RESPONSE=$(curl -sf "$BOT_API/bot$BOT_TOKEN/sendDocument" \
+              -F chat_id="$CHAT_ID" \
+              -F document=@"$FILE" \
+              -F caption="$CAPTION")
+            POSTS[$PLATFORM]=$(echo "$RESPONSE" | jq -r '.result.message_id')
+            echo "$PLATFORM -> post ${POSTS[$PLATFORM]}"
+          done
+
           MANIFEST_B64=$(base64 -w0 Telegram/Resources/update/manifest.min.json)
           MANIFEST_SIG_B64=$(base64 -w0 Telegram/Resources/update/manifest.sig)
 
-          make_changelog() { # $1 = previous commit, $2 = counter
-            {
-              echo "Canary #$2 · ${{ needs.version.outputs.commit }}"
-              echo ""
-              if [ -n "$1" ] && git cat-file -e "$1^{commit}" 2>/dev/null; then
-                git log --no-merges --pretty=format:'• %s' "$1..HEAD" | head -20
-              else
-                git log --no-merges --pretty=format:'• %s' -10
-              fi
-            } | head -c 1000
-          }
-
-          publish_channel() { # $1=channel $2=chat_id $3=msg_id $4=counter $5=previous
-            local CAPTION=$(make_changelog "$5" "$4")
-            declare -A POSTS
-            for PLATFORM in win64 mac linux; do
-              local FILE=$(ls artifacts/canary-$1-$PLATFORM/tv2-* | head -1)
-              if [[ "$FILE" == *.unsigned ]]; then
-                echo "::error::canary-$1 $PLATFORM update is unsigned, refusing to publish."
-                return 1
-              fi
-              local RESPONSE=$(curl -sf "$BOT_API/bot$BOT_TOKEN/sendDocument" \
-                -F chat_id="$2" \
-                -F document=@"$FILE" \
-                -F caption="$CAPTION")
-              POSTS[$PLATFORM]=$(echo "$RESPONSE" | jq -r '.result.message_id')
-              echo "canary-$1 $PLATFORM -> post ${POSTS[$PLATFORM]}"
-            done
-
-            # The macOS build is universal, both runtime platform keys
-            # point at the same post.
-            local NEW=$(jq -n \
-              --arg manifest "$MANIFEST_B64" \
-              --arg manifest_sig "$MANIFEST_SIG_B64" \
-              --arg commit "${{ needs.version.outputs.commit }}" \
-              --argjson base "${{ needs.version.outputs.base }}" \
-              --argjson counter "$4" \
-              --argjson win64 "${POSTS[win64]}" \
-              --argjson mac "${POSTS[mac]}" \
-              --argjson linux "${POSTS[linux]}" \
-              "{
-                format: 1,
-                manifest: \$manifest,
-                manifest_sig: \$manifest_sig,
-                channels: {
-                  \"canary-$1\": {
-                    base: \$base,
-                    counter: \$counter,
-                    commit: \$commit,
-                    posts: {
-                      win64: \$win64,
-                      mac: \$mac,
-                      armac: \$mac,
-                      linux: \$linux
-                    }
+          # The macOS build is universal, both runtime platform keys
+          # point at the same post.
+          NEW=$(jq -n \
+            --arg manifest "$MANIFEST_B64" \
+            --arg manifest_sig "$MANIFEST_SIG_B64" \
+            --arg commit "${{ needs.version.outputs.commit }}" \
+            --argjson base "${{ needs.version.outputs.base }}" \
+            --argjson counter "$COUNTER" \
+            --argjson win64 "${POSTS[win64]}" \
+            --argjson mac "${POSTS[mac]}" \
+            --argjson linux "${POSTS[linux]}" \
+            "{
+              format: 1,
+              manifest: \$manifest,
+              manifest_sig: \$manifest_sig,
+              channels: {
+                \"canary-$CHANNEL\": {
+                  base: \$base,
+                  counter: \$counter,
+                  commit: \$commit,
+                  posts: {
+                    win64: \$win64,
+                    mac: \$mac,
+                    armac: \$mac,
+                    linux: \$linux
                   }
                 }
-              }")
-            curl -sf "$BOT_API/bot$BOT_TOKEN/editMessageText" \
-              -F chat_id="$2" \
-              -F message_id="$3" \
-              --form-string text="$NEW" || {
-                echo "::error::Could not edit the canary-$1 metadata message $3."
-                return 1
               }
-          }
-
-          publish_channel public "$PUBLIC_CHANNEL" "$PUBLIC_MSG_ID" \
-            "${{ needs.version.outputs.counter_public }}" \
-            "${{ needs.version.outputs.previous_public }}"
-          publish_channel private "-100$PRIVATE_CHANNEL" "$PRIVATE_MSG_ID" \
-            "${{ needs.version.outputs.counter_private }}" \
-            "${{ needs.version.outputs.previous_private }}"
+            }")
+          curl -sf "$BOT_API/bot$BOT_TOKEN/editMessageText" \
+            -F chat_id="$CHAT_ID" \
+            -F message_id="$MSG_ID" \
+            --form-string text="$NEW" || {
+              echo "::error::Could not edit the metadata message $MSG_ID."
+              exit 1
+            }