*** Please remove the following help text before submitting: ***

.editorconfig

@@ -13,7 +13,7 @@ trim_trailing_whitespace = true
 [*.{h,cpp,rs,py,sh}]
 indent_size = 4
 
-# .cirrus.yml, etc.
+# ci.yml, etc.
 [*.yml]
 indent_size = 2
 

.gitattributes

@@ -1 +1,2 @@
 src/clientversion.cpp export-subst
+src/CMakeLists.txt export-subst

.github/ISSUE_TEMPLATE/bug.yml

@@ -10,6 +10,7 @@ body:
         * General bitcoin questions and/or support requests should use Bitcoin StackExchange at https://bitcoin.stackexchange.com.
         * For reporting security issues, please read instructions at https://bitcoincore.org/en/contact/.
         * If the node is "stuck" during sync or giving "block checksum mismatch" errors, please ensure your hardware is stable by running `memtest` and observe CPU temperature with a load-test tool such as `linpack` before creating an issue.
+        * If you use AI tools when opening this issue, please read the [AI policy](https://github.com/bitcoin/bitcoin/blob/master/doc/AI_POLICY.md).
 
         ----
   - type: checkboxes
@@ -78,7 +79,7 @@ body:
     id: os
     attributes:
       label: Operating system and version
-      placeholder: e.g. "MacOS Ventura 13.2" or "Ubuntu 22.04 LTS"
+      placeholder: e.g. "MacOS 26.0" or "Ubuntu 26.04 LTS"
     validations:
       required: true
   - type: textarea
@@ -90,4 +91,3 @@ body:
         e.g. OS/CPU and disk type, network connectivity
     validations:
       required: false
-

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -2,6 +2,11 @@ name: Feature Request
 description: Suggest an idea for this project.
 labels: [Feature]
 body:
+  - type: markdown
+    attributes:
+      value: |
+        If you use AI tools when opening this issue, please read the [AI policy](https://github.com/bitcoin/bitcoin/blob/master/doc/AI_POLICY.md).
+
   - type: textarea
     id: feature
     attributes:

.github/ISSUE_TEMPLATE/gui_issue.yml

@@ -2,6 +2,11 @@ name: Issue or feature request related to the GUI
 description: Any report, issue or feature request related to the GUI
 labels: [GUI]
 body:
+- type: markdown
+  attributes:
+    value: |
+      If you use AI tools when opening this issue, please read the [AI policy](https://github.com/bitcoin/bitcoin/blob/master/doc/AI_POLICY.md).
+
 - type: checkboxes
   id: acknowledgement
   attributes:

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,12 +1,13 @@
 <!--
 *** Please remove the following help text before submitting: ***
 
-Pull requests without a rationale and clear improvement may be closed
-immediately.
+Pull requests may be closed immediately if they:
+- do not have a rationale and clear improvement
+- do not adhere to doc/AI_POLICY.md
 
 GUI-related pull requests should be opened against
-https://github.com/bitcoin-core/gui
-first. See CONTRIBUTING.md
+https://github.com/bitcoin-core/gui first.
+See CONTRIBUTING.md
 -->
 
 <!--

.github/actions/restore-caches/action.yml → .github/actions/cache/restore/action.yml

@@ -1,43 +1,51 @@
 name: 'Restore Caches'
 description: 'Restore ccache, depends sources, and built depends caches'
+inputs:
+  provider:
+    description: 'The cache provider to use'
+    required: true
 runs:
   using: 'composite'
   steps:
     - name: Restore Ccache cache
       id: ccache-cache
-      uses: cirruslabs/cache/restore@v4
+      uses: ./.github/actions/cache/restore/internal
       with:
         path: ${{ env.CCACHE_DIR }}
         key: ccache-${{ env.CONTAINER_NAME }}-${{ github.run_id }}
         restore-keys: |
           ccache-${{ env.CONTAINER_NAME }}-
+        provider: ${{ inputs.provider }}
 
     - name: Restore depends sources cache
       id: depends-sources
-      uses: cirruslabs/cache/restore@v4
+      uses: ./.github/actions/cache/restore/internal
       with:
         path: ${{ env.SOURCES_PATH }}
         key: depends-sources-${{ env.CONTAINER_NAME }}-${{ env.DEPENDS_HASH }}
         restore-keys: |
           depends-sources-${{ env.CONTAINER_NAME }}-
+        provider: ${{ inputs.provider }}
 
     - name: Restore built depends cache
       id: depends-built
-      uses: cirruslabs/cache/restore@v4
+      uses: ./.github/actions/cache/restore/internal
       with:
         path: ${{ env.BASE_CACHE }}
         key: depends-built-${{ env.CONTAINER_NAME }}-${{ env.DEPENDS_HASH }}
         restore-keys: |
           depends-built-${{ env.CONTAINER_NAME }}-
+        provider: ${{ inputs.provider }}
 
     - name: Restore previous releases cache
       id: previous-releases
-      uses: cirruslabs/cache/restore@v4
+      uses: ./.github/actions/cache/restore/internal
       with:
         path: ${{ env.PREVIOUS_RELEASES_DIR }}
         key: previous-releases-${{ env.CONTAINER_NAME }}-${{ env.PREVIOUS_RELEASES_HASH }}
         restore-keys: |
           previous-releases-${{ env.CONTAINER_NAME }}-
+        provider: ${{ inputs.provider }}
 
     - name: export cache hits
       shell: bash

.github/actions/cache/restore/internal/action.yml

@@ -0,0 +1,43 @@
+name: 'Cache Restore'
+description: 'Restore a cache with WarpBuild on Warp runners and GitHub Actions cache otherwise'
+inputs:
+  path:
+    description: 'A list of files, directories, and wildcard patterns to restore'
+    required: true
+  key:
+    description: 'An explicit key for restoring the cache'
+    required: true
+  restore-keys:
+    description: 'An ordered multiline string listing prefix-matched restore keys'
+    required: false
+    default: ''
+  provider:
+    description: 'The cache provider to use'
+    required: true
+outputs:
+  cache-hit:
+    description: 'A boolean value to indicate an exact match was found for the primary key'
+    value: ${{ steps.warp.outputs.cache-hit || steps.gha.outputs.cache-hit }}
+  cache-primary-key:
+    description: 'The primary key used to restore the cache'
+    value: ${{ steps.warp.outputs.cache-primary-key || steps.gha.outputs.cache-primary-key }}
+runs:
+  using: 'composite'
+  steps:
+    - name: Restore cache with WarpBuild
+      id: warp
+      if: ${{ inputs.provider == 'warp' }}
+      uses: WarpBuilds/cache/restore@v1
+      with:
+        path: ${{ inputs.path }}
+        key: ${{ inputs.key }}
+        restore-keys: ${{ inputs.restore-keys }}
+
+    - name: Restore cache with GitHub Actions
+      id: gha
+      if: ${{ inputs.provider == 'gha' }}
+      uses: actions/cache/restore@v5
+      with:
+        path: ${{ inputs.path }}
+        key: ${{ inputs.key }}
+        restore-keys: ${{ inputs.restore-keys }}

.github/actions/save-caches/action.yml → .github/actions/cache/save/action.yml

@@ -1,5 +1,9 @@
 name: 'Save Caches'
 description: 'Save ccache, depends sources, and built depends caches'
+inputs:
+  provider:
+    description: 'The cache provider to use'
+    required: true
 runs:
   using: 'composite'
   steps:
@@ -11,29 +15,33 @@ runs:
         echo "previous releases direct cache hit to primary key: ${{ env.previous-releases-cache-hit }}"
 
     - name: Save Ccache cache
-      uses: cirruslabs/cache/save@v4
+      uses: ./.github/actions/cache/save/internal
       if: ${{ (github.event_name == 'push') && (github.ref_name == github.event.repository.default_branch) }}
       with:
         path: ${{ env.CCACHE_DIR }}
         key: ccache-${{ env.CONTAINER_NAME }}-${{ github.run_id }}
+        provider: ${{ inputs.provider }}
 
     - name: Save depends sources cache
-      uses: cirruslabs/cache/save@v4
+      uses: ./.github/actions/cache/save/internal
       if: ${{ (github.event_name == 'push') && (github.ref_name == github.event.repository.default_branch) && (env.depends-sources-cache-hit != 'true') }}
       with:
         path: ${{ env.SOURCES_PATH }}
         key: depends-sources-${{ env.CONTAINER_NAME }}-${{ env.DEPENDS_HASH }}
+        provider: ${{ inputs.provider }}
 
     - name: Save built depends cache
-      uses: cirruslabs/cache/save@v4
+      uses: ./.github/actions/cache/save/internal
       if: ${{ (github.event_name == 'push') && (github.ref_name == github.event.repository.default_branch) && (env.depends-built-cache-hit != 'true' )}}
       with:
         path: ${{ env.BASE_CACHE }}
         key: depends-built-${{ env.CONTAINER_NAME }}-${{ env.DEPENDS_HASH }}
+        provider: ${{ inputs.provider }}
 
     - name: Save previous releases cache
-      uses: cirruslabs/cache/save@v4
+      uses: ./.github/actions/cache/save/internal
       if: ${{ (github.event_name == 'push') && (github.ref_name == github.event.repository.default_branch) && (env.previous-releases-cache-hit != 'true' )}}
       with:
         path: ${{ env.PREVIOUS_RELEASES_DIR }}
         key: previous-releases-${{ env.CONTAINER_NAME }}-${{ env.PREVIOUS_RELEASES_HASH }}
+        provider: ${{ inputs.provider }}

.github/actions/cache/save/internal/action.yml

@@ -0,0 +1,28 @@
+name: 'Cache Save'
+description: 'Save a cache with WarpBuild on Warp runners and GitHub Actions cache otherwise'
+inputs:
+  path:
+    description: 'A list of files, directories, and wildcard patterns to cache'
+    required: true
+  key:
+    description: 'An explicit key for saving the cache'
+    required: true
+  provider:
+    description: 'The cache provider to use'
+    required: true
+runs:
+  using: 'composite'
+  steps:
+    - name: Save cache with WarpBuild
+      if: ${{ inputs.provider == 'warp' }}
+      uses: WarpBuilds/cache/save@v1
+      with:
+        path: ${{ inputs.path }}
+        key: ${{ inputs.key }}
+
+    - name: Save cache with GitHub Actions
+      if: ${{ inputs.provider == 'gha' }}
+      uses: actions/cache/save@v5
+      with:
+        path: ${{ inputs.path }}
+        key: ${{ inputs.key }}

.github/actions/clear-files/action.yml

@@ -0,0 +1,12 @@
+name: 'Clear unnecessary files'
+description: 'Clear out unnecessary files to make space on the VM'
+runs:
+  using: 'composite'
+  steps:
+    - name: Clear unnecessary files
+      shell: bash
+      env:
+        DEBIAN_FRONTEND: noninteractive
+      run: |
+        set +o errexit
+        sudo bash -c '(ionice -c 3 nice -n 19 rm -rf /usr/share/dotnet/ /usr/local/graalvm/ /usr/local/.ghcup/ /usr/local/share/powershell /usr/local/share/chromium /usr/local/lib/android /usr/local/lib/node_modules)&'

.github/actions/configure-docker/action.yml

@@ -1,49 +1,57 @@
 name: 'Configure Docker'
 description: 'Set up Docker build driver and configure build cache args'
 inputs:
-  use-cirrus:
-    description: 'Use cirrus cache'
-    required: true
+  provider:
+    description: 'The cache provider to use'
+    required: false
+    default: 'gha'
 runs:
   using: 'composite'
   steps:
-    - name: Set up Docker Buildx
-      uses: docker/setup-buildx-action@v3
+    - name: Set up Docker Buildx for Warp cache
+      if: ${{ inputs.provider == 'warp' }}
+      uses: docker/setup-buildx-action@v4
       with:
-        # Use host network to allow access to cirrus gha cache running on the host
         driver-opts: |
           network=host
+          env.BUILDKIT_STEP_LOG_MAX_SIZE=5242880
+
+    - name: Set up Docker Buildx
+      if: ${{ inputs.provider != 'warp' }}
+      uses: docker/setup-buildx-action@v4
+      with:
+        driver-opts: |
+          env.BUILDKIT_STEP_LOG_MAX_SIZE=5242880
 
-    # This is required to allow buildkit to access the actions cache
+    # This is required when using the gha cache backend with a manual docker buildx invocation.
+    # Docker will check for variables $ACTIONS_CACHE_URL, $ACTIONS_RESULTS_URL and $ACTIONS_RUNTIME_TOKEN
+    # which are set automatically when running on GitHub infra: https://docs.docker.com/build/cache/backends/gha/#synopsis
     - name: Expose actions cache variables
-      uses: actions/github-script@v6
+      uses: actions/github-script@v8
       with:
         script: |
-          core.exportVariable('ACTIONS_CACHE_URL', process.env['ACTIONS_CACHE_URL'])
-          core.exportVariable('ACTIONS_RUNTIME_TOKEN', process.env['ACTIONS_RUNTIME_TOKEN'])
+          Object.keys(process.env).forEach(function (key) {
+            if (key.startsWith('ACTIONS_')) {
+              core.info(`Exporting ${key}`);
+              core.exportVariable(key, process.env[key]);
+            }
+          });
 
     - name: Construct docker build cache args
       shell: bash
       run: |
-        # Configure docker build cache backend
-        #
-        # On forks the gha cache will work but will use Github's cache backend.
-        # Docker will check for variables $ACTIONS_CACHE_URL, $ACTIONS_RESULTS_URL and $ACTIONS_RUNTIME_TOKEN
-        # which are set automatically when running on GitHub infra: https://docs.docker.com/build/cache/backends/gha/#synopsis
-
-        # Use cirrus cache host
-        if [[ ${{ inputs.use-cirrus }} == 'true' ]]; then
-          url_args="url=${CIRRUS_CACHE_HOST},url_v2=${CIRRUS_CACHE_HOST}"
-        else
-          url_args=""
+        cache_options="scope=${CONTAINER_NAME}"
+        if [[ "${{ inputs.provider }}" == "warp" ]]; then
+          cache_options="url=http://127.0.0.1:49160/,version=1,${cache_options}"
         fi
 
+        # Configure docker build cache backend
         # Always optimistically --cache‑from in case a cache blob exists
-        args=(--cache-from "type=gha${url_args:+,${url_args}},scope=${CONTAINER_NAME}")
+        args=(--cache-from "type=gha,${cache_options}")
 
-        # If this is a push to the default branch, also add --cache‑to to save the cache
+        # Only add --cache-to when pushing to the default branch.
         if [[ ${{ github.event_name }} == "push" && ${{ github.ref_name }} == ${{ github.event.repository.default_branch }} ]]; then
-          args+=(--cache-to "type=gha${url_args:+,${url_args}},mode=max,ignore-error=true,scope=${CONTAINER_NAME}")
+          args+=(--cache-to "type=gha,mode=max,ignore-error=true,${cache_options}")
         fi
 
         # Always `--load` into docker images (needed when using the `docker-container` build driver).