diff --git a/.github/actions/checkout-maintainer-tools/action.yml b/.github/actions/checkout-maintainer-tools/action.yml
new file mode 100644
index 00000000..d675edf0
--- /dev/null
+++ b/.github/actions/checkout-maintainer-tools/action.yml
@@ -0,0 +1,11 @@
+name: Checkout Maintainer Tools
+description: Checks out the rust-bitcoin maintainer tools repo
+runs:
+  using: "composite"
+  steps:
+    - name: Checkout maintainer tools
+      uses: actions/checkout@v4
+      with:
+        repository: rust-bitcoin/rust-bitcoin-maintainer-tools
+        ref: f92b2766865ce5327eca5cf72f86ceaa6be58ca4
+        path: maintainer-tools
diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
new file mode 100644
index 00000000..39315c45
--- /dev/null
+++ b/.github/workflows/rust.yml
@@ -0,0 +1,171 @@
+on:   # yamllint disable-line rule:truthy
+  pull_request:
+  push:
+    branches:
+      - master
+      - 'test-ci/**'
+
+name: Continuous integration
+
+jobs:
+  Prepare:
+    runs-on: ubuntu-latest
+    outputs:
+      nightly_version: ${{ steps.read_toolchain.outputs.nightly_version }}
+      msrv_version: ${{ steps.read_msrv.outputs.msrv_version }}
+    steps:
+      - name: "Checkout repo"
+        uses: actions/checkout@v4
+      - name: "Read nightly version"
+        id: read_toolchain
+        run: |
+          set -euo pipefail
+          version=$(cat nightly-version)
+          echo "nightly_version=$version" >> $GITHUB_OUTPUT
+      - name: Read MSRV from clippy.toml
+        id: read_msrv
+        run: |
+          set -euo pipefail
+          msrv=$(grep '^msrv *= *"' clippy.toml | sed -E 's/.*"([^"]+)".*/\1/')
+          echo "msrv_version=$msrv" >> "$GITHUB_OUTPUT"
+
+  Stable:
+    name: Test - stable toolchain
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+    steps:
+      - name: "Checkout repo"
+        uses: actions/checkout@v4
+      - name: "Checkout maintainer tools"
+        uses: ./.github/actions/checkout-maintainer-tools
+      - name: "Select toolchain"
+        uses: dtolnay/rust-toolchain@stable
+      - name: "Run test script"
+        run: ./maintainer-tools/ci/run_task.sh stable
+
+  Nightly:
+    name: Test - nightly toolchain
+    needs: Prepare
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+    steps:
+      - name: "Checkout repo"
+        uses: actions/checkout@v4
+      - name: "Checkout maintainer tools"
+        uses: ./.github/actions/checkout-maintainer-tools
+      - name: "Select toolchain"
+        uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: ${{ needs.Prepare.outputs.nightly_version }}
+      - name: "Run test script"
+        run: ./maintainer-tools/ci/run_task.sh nightly
+
+  MSRV:
+    name: Test - MSRV
+    needs: Prepare
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+    steps:
+      - name: "Checkout repo"
+        uses: actions/checkout@v4
+      - name: "Checkout maintainer tools"
+        uses: ./.github/actions/checkout-maintainer-tools
+      - name: "Select toolchain"
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          toolchain: ${{ needs.Prepare.outputs.msrv_version }}
+      - name: "Run test script"
+        run: ./maintainer-tools/ci/run_task.sh msrv
+
+  Lint:
+    name: Lint - nightly toolchain
+    needs: Prepare
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        dep: [recent]
+    steps:
+      - name: "Checkout repo"
+        uses: actions/checkout@v4
+      - name: "Checkout maintainer tools"
+        uses: ./.github/actions/checkout-maintainer-tools
+      - name: "Select toolchain"
+        uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: ${{ needs.Prepare.outputs.nightly_version }}
+      - name: Install clippy
+        run: rustup component add clippy
+      - name: "Run test script"
+        run: ./maintainer-tools/ci/run_task.sh lint
+
+  Docs:
+    name: Docs - stable toolchain
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        dep: [recent]
+    steps:
+      - name: "Checkout repo"
+        uses: actions/checkout@v4
+      - name: "Checkout maintainer tools"
+        uses: ./.github/actions/checkout-maintainer-tools
+      - name: "Select toolchain"
+        uses: dtolnay/rust-toolchain@stable
+      - name: "Run test script"
+        run: ./maintainer-tools/ci/run_task.sh docs
+
+  Docsrs:
+    name: Docs - nightly toolchain
+    needs: Prepare
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        dep: [recent]
+    steps:
+      - name: "Checkout repo"
+        uses: actions/checkout@v4
+      - name: "Checkout maintainer tools"
+        uses: ./.github/actions/checkout-maintainer-tools
+      - name: "Select toolchain"
+        uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: ${{ needs.Prepare.outputs.nightly_version }}
+      - name: "Run test script"
+        run: ./maintainer-tools/ci/run_task.sh docsrs
+
+  Format:
+    name: Format - nightly toolchain
+    needs: Prepare
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+    steps:
+      - name: "Checkout repo"
+        uses: actions/checkout@v4
+      - name: "Select toolchain"
+        uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: ${{ needs.Prepare.outputs.nightly_version }}
+      - name: "Install rustfmt"
+        run: rustup component add rustfmt
+      - name: "Check formatting"
+        run: cargo fmt --all -- --check
+
+  Wasm:
+    name: Check WASM
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+    steps:
+      - name: Checkout Crate
+        uses: actions/checkout@v3
+      - name: Checkout Toolchain
+        uses: dtolnay/rust-toolchain@stable
+      - run: rustup target add wasm32-unknown-unknown
+      - run: cargo check --target wasm32-unknown-unknown
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
deleted file mode 100644
index 219b0f81..00000000
--- a/.github/workflows/test.yml
+++ /dev/null
@@ -1,154 +0,0 @@
-name: Test
-on:
-  push:
-  pull_request:
-jobs:
-  check-flake:
-    name: Check flake
-    runs-on: ubuntu-latest
-
-    steps:
-    - name: Checkout
-      uses: actions/checkout@v3
-
-    - name: Install nix
-      uses: cachix/install-nix-action@v24
-      with:
-        github_access_token: ${{ secrets.GITHUB_TOKEN }}
-
-    - name: Check flake
-      run: nix flake check --all-systems
-
-  test-stable:
-    name: Test - stable toolchain
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os: [ubuntu-latest, macos-latest]
-
-    steps:
-    - name: Checkout
-      uses: actions/checkout@v3
-
-    - name: Install nix
-      uses: cachix/install-nix-action@v24
-      with:
-        github_access_token: ${{ secrets.GITHUB_TOKEN }}
-
-    - name: Enable Rust cache
-      uses: Swatinem/rust-cache@v2
-
-    - name: Run all checks
-      run: |
-        nix develop .#ci --command bash -c "just check"
-
-  test-msrv:
-    name: Test - MSRV toolchain
-    runs-on: ubuntu-latest
-
-    steps:
-    - name: Checkout
-      uses: actions/checkout@v3
-
-    - name: Install nix
-      uses: cachix/install-nix-action@v24
-      with:
-        github_access_token: ${{ secrets.GITHUB_TOKEN }}
-
-    - name: Enable Rust cache
-      uses: Swatinem/rust-cache@v2
-
-    - name: Run unit tests
-      run: |
-        nix develop .#msrv --command bash -c "just test"
-
-  test-windows:
-    name: Test - stable toolchain (windows-latest)
-    runs-on: windows-latest
-
-    steps:
-    - name: Checkout
-      uses: actions/checkout@v3
-
-    - name: Checkout Toolchain
-      uses: dtolnay/rust-toolchain@stable
-
-    - name: Enable Rust cache
-      uses: Swatinem/rust-cache@v2
-
-    - name: Install just
-      uses: extractions/setup-just@v2
-
-    - name: Run unit tests
-      run: just test
-
-  test-fuzz:
-    name: Test - fuzzer
-    runs-on: ubuntu-latest
-    needs: test-stable
-    strategy:
-      matrix:
-        fuzz_target:
-          - compile_parse_tree
-          - compile_text
-          - display_parse_tree
-          - parse_value_rtt
-          - parse_witness_json_rtt
-          - parse_witness_module_rtt
-          - reconstruct_value
-    steps:
-    - name: Checkout
-      uses: actions/checkout@v3
-
-    - name: Install nix
-      uses: cachix/install-nix-action@v24
-      with:
-        github_access_token: ${{ secrets.GITHUB_TOKEN }}
-
-    - name: Enable Rust cache
-      uses: Swatinem/rust-cache@v2
-
-    - name: Run fuzz target ${{ matrix.fuzz_target }}
-      run: |
-        nix develop .#fuzz --command bash -c "just fuzz ${{ matrix.fuzz_target }}"
-
-  build-integration:
-    name: Build - integration tests
-    runs-on: ubuntu-latest
-
-    steps:
-    - name: Checkout
-      uses: actions/checkout@v3
-
-    - name: Install nix
-      uses: cachix/install-nix-action@v24
-      with:
-        github_access_token: ${{ secrets.GITHUB_TOKEN }}
-
-    - name: Enable Rust cache
-      uses: Swatinem/rust-cache@v2
-
-    - name: Build each integration test
-      run: |
-        nix develop .#ci --command bash -c "just build_integration"
-
-  build-wasm:
-    name: Build - WASM
-    runs-on: ubuntu-latest
-    needs: test-stable
-
-    steps:
-    - name: Checkout
-      uses: actions/checkout@v3
-
-    - name: Install nix
-      uses: cachix/install-nix-action@v24
-      with:
-        github_access_token: ${{ secrets.GITHUB_TOKEN }}
-
-    - name: Enable Rust cache
-      uses: Swatinem/rust-cache@v2
-
-    - name: Build WASM library
-      run: |
-        nix develop .#wasm --command bash -c "just build_wasm"
diff --git a/contrib/crates.sh b/contrib/crates.sh
new file mode 100755
index 00000000..48876bab
--- /dev/null
+++ b/contrib/crates.sh
@@ -0,0 +1,9 @@
+# Sourced by `rust-bitcoin-maintainer-tools/ci/run_task.sh`.
+#
+# No shebang, this file should not be executed.
+# shellcheck disable=SC2148
+#
+# disable verify unused vars, despite the fact that they are used when sourced
+# shellcheck disable=SC2034
+
+CRATES=(. codegen)
\ No newline at end of file
diff --git a/contrib/extra_tests.sh b/contrib/extra_tests.sh
new file mode 100755
index 00000000..ad4f52be
--- /dev/null
+++ b/contrib/extra_tests.sh
@@ -0,0 +1,54 @@
+#!/usr/bin/env bash
+
+set -ex
+
+REPO_DIR=$(git rev-parse --show-toplevel)
+
+# Make all cargo invocations verbose.
+export CARGO_TERM_VERBOSE=true
+
+# Set to false to turn off verbose output.
+flag_verbose=true
+
+main() {
+    source_test_vars            # Get feature list.
+
+    # FIXME put bitcoind-tests in here
+    echo "No tests, all good."
+}
+
+# ShellCheck can't follow non-constant source, `test_vars_script` is correct.
+# shellcheck disable=SC1090
+source_test_vars() {
+    local test_vars_script="$REPO_DIR/contrib/test_vars.sh"
+
+    verbose_say "Sourcing $test_vars_script"
+
+    if [ -e "$test_vars_script" ]; then
+        # Set crate specific variables.
+        . "$test_vars_script"
+    else
+        err "Missing $test_vars_script"
+    fi
+}
+
+say() {
+    echo "extra_tests: $1"
+}
+
+verbose_say() {
+    if [ "$flag_verbose" = true ]; then
+	say "$1"
+    fi
+}
+
+err() {
+    echo "$1" >&2
+    exit 1
+}
+
+#
+# Main script
+#
+main "$@"
+exit 0
diff --git a/contrib/test_vars.sh b/contrib/test_vars.sh
new file mode 100644
index 00000000..0d9e0da9
--- /dev/null
+++ b/contrib/test_vars.sh
@@ -0,0 +1,14 @@
+# No shebang, this file should not be executed.
+# shellcheck disable=SC2148
+#
+# disable verify unused vars, despite the fact that they are used when sourced
+# shellcheck disable=SC2034
+
+# Test all these features with "std" enabled.
+FEATURES_WITH_STD=""
+
+# Test all these features without "std" enabled.
+FEATURES_WITHOUT_STD="serde arbitrary"
+
+# Run these examples.
+EXAMPLES="$(cargo metadata --no-deps --format-version 1 |jq -r '.packages | .[] | .targets | .[] | select(.kind == ["example"]) | .name + ":"')"
diff --git a/nightly-version b/nightly-version
new file mode 100644
index 00000000..d361064a
--- /dev/null
+++ b/nightly-version
@@ -0,0 +1 @@
+nightly-2025-08-23