diff --git a/.github/workflows/README.md b/.github/workflows/README.md
new file mode 100644
index 0000000..e189ad6
--- /dev/null
+++ b/.github/workflows/README.md
@@ -0,0 +1,24 @@
+# rust-psbt workflow notes
+
+We are attempting to run max 20 parallel jobs using GitHub actions (usage limit for free tier).
+
+ref: https://docs.github.com/en/actions/learn-github-actions/usage-limits-billing-and-administration
+
+The minimal/recent lock files are handled by CI (`rust.yml`).
+
+## Jobs
+
+Run from rust.yml unless stated otherwise. Unfortunately we are now exceeding the 20 job target.
+(Prepare is quick and must be run first anyway.)
+
+0.  `Prepare`
+1.  `Stable - minimal`
+2.  `Stable - recent`
+3.  `Nightly - minimal`
+4.  `Nightly - recent`
+5.  `MSRV - minimal`
+6.  `MSRV - recent`
+7.  `Lint`
+8.  `Docs`
+9.  `Docsrs`
+10. `Format`
diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 4bea5ca..7b5f498 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -1,4 +1,5 @@
-on:
+---   # rust-psbt CI: If you edit this file please update README.md
+on:   # yamllint disable-line rule:truthy
   push:
     branches:
       - master
@@ -8,71 +9,190 @@ on:
 name: Continuous integration
 
 jobs:
-  Stable:
+  Prepare:
+    runs-on: ubuntu-latest
+    outputs:
+      nightly_version: ${{ steps.read_toolchain.outputs.nightly_version }}
+    steps:
+      - name: "Checkout repo"
+        uses: actions/checkout@v4
+      - name: "Read nightly version"
+        id: read_toolchain
+        run: echo "nightly_version=$(cat nightly-version)" >> $GITHUB_OUTPUT
+
+  Stable:                       # 2 jobs, one per lock file.
     name: Test - stable toolchain
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
+      matrix:
+        dep: [minimal, recent]
     steps:
-      - name: Checkout Crate
+      - name: "Checkout repo"
+        uses: actions/checkout@v4
+      - name: "Checkout maintainer tools"
         uses: actions/checkout@v4
-      - name: Checkout Toolchain
-        # https://github.com/dtolnay/rust-toolchain
+        with:
+          repository: rust-bitcoin/rust-bitcoin-maintainer-tools
+          rev: b2ac115
+          path: maintainer-tools
+      - name: "Select toolchain"
         uses: dtolnay/rust-toolchain@stable
-      - name: Install clippy
-        run: rustup component add clippy
-      - name: Running test script
-        env:
-          DO_LINT: true
-          DO_NO_STD: true
-          DO_DOCS: true
-        run: ./contrib/test.sh
+      - name: "Set dependencies"
+        run: cp Cargo-${{ matrix.dep }}.lock Cargo.lock
+      - name: "Run test script"
+        run: ./maintainer-tools/ci/run_task.sh stable
 
-  Beta:
-    name: Test - beta toolchain
+  Nightly:                      # 2 jobs, one per lock file.
+    name: Test - nightly toolchain
+    needs: Prepare
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
+      matrix:
+        dep: [minimal, recent]
     steps:
-      - name: Checkout Crate
+      - name: "Checkout repo"
+        uses: actions/checkout@v4
+      - name: "Checkout maintainer tools"
         uses: actions/checkout@v4
-      - name: Checkout Toolchain
-        uses: dtolnay/rust-toolchain@beta
-      - name: Running test script
-        env:
-          DO_NO_STD: true
-        run: ./contrib/test.sh
+        with:
+          repository: rust-bitcoin/rust-bitcoin-maintainer-tools
+          rev: b2ac115
+          path: maintainer-tools
+      - name: "Select toolchain"
+        uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: ${{ needs.Prepare.outputs.nightly_version }}
+      - name: "Set dependencies"
+        run: cp Cargo-${{ matrix.dep }}.lock Cargo.lock
+      - name: "Run test script"
+        run: ./maintainer-tools/ci/run_task.sh nightly
 
-  Nightly:
-    name: Test - nightly toolchain
+  MSRV:                         # 2 jobs, one per lock file.
+    name: Test - MSRV toolchain
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
+      matrix:
+        dep: [minimal, recent]
     steps:
-      - name: Checkout Crate
+      - name: "Checkout repo"
         uses: actions/checkout@v4
-      - name: Checkout Toolchain
-        uses: dtolnay/rust-toolchain@nightly
-      - name: Running test script
-        env:
-          DO_FMT: false
-          DO_NO_STD: true
-          DO_DOCSRS: true
-        run: ./contrib/test.sh
+      - name: "Checkout maintainer tools"
+        uses: actions/checkout@v4
+        with:
+          repository: rust-bitcoin/rust-bitcoin-maintainer-tools
+          rev: b2ac115
+          path: maintainer-tools
+      - name: "Select toolchain"
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          toolchain: "1.63.0"
+      - name: "Set dependencies"
+        run: cp Cargo-${{ matrix.dep }}.lock Cargo.lock
+      - name: "Run test script"
+        run: ./maintainer-tools/ci/run_task.sh msrv
 
-  MSRV:
-    name: Test - 1.63.0 toolchain
+  Lint:
+    name: Lint - nightly toolchain
+    needs: Prepare
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
+      matrix:
+        dep: [recent]
     steps:
-      - name: Checkout Crate
+      - name: "Checkout repo"
+        uses: actions/checkout@v4
+      - name: "Checkout maintainer tools"
         uses: actions/checkout@v4
-      - name: Checkout Toolchain
+        with:
+          repository: rust-bitcoin/rust-bitcoin-maintainer-tools
+          rev: b2ac115
+          path: maintainer-tools
+      - name: "Select toolchain"
+        uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: ${{ needs.Prepare.outputs.nightly_version }}
+      - name: "Install clippy"
+        run: rustup component add clippy
+      - name: "Set dependencies"
+        run: cp Cargo-${{ matrix.dep }}.lock Cargo.lock
+      - 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: actions/checkout@v4
+        with:
+          repository: rust-bitcoin/rust-bitcoin-maintainer-tools
+          rev: b2ac115
+          path: maintainer-tools
+      - name: "Select toolchain"
         uses: dtolnay/rust-toolchain@stable
+      - name: "Set dependencies"
+        run: cp Cargo-${{ matrix.dep }}.lock Cargo.lock
+      - 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: actions/checkout@v4
         with:
-          toolchain: "1.63.0"
-      - name: Running test script
-        env:
-          DO_NO_STD: true
-        run: ./contrib/test.sh
+          repository: rust-bitcoin/rust-bitcoin-maintainer-tools
+          rev: b2ac115
+          path: maintainer-tools
+      - name: "Select toolchain"
+        uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: ${{ needs.Prepare.outputs.nightly_version }}
+      - name: "Set dependencies"
+        run: cp Cargo-${{ matrix.dep }}.lock Cargo.lock
+      - name: "Run test script"
+        run: ./maintainer-tools/ci/run_task.sh docsrs
+
+  Format:                       #  1 job, run cargo fmt directly.
+    name: Format - 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: actions/checkout@v4
+        with:
+          repository: rust-bitcoin/rust-bitcoin-maintainer-tools
+          rev: b2ac115
+          path: maintainer-tools
+      - name: "Select toolchain"
+        uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: ${{ needs.Prepare.outputs.nightly_version }}
+      - name: "Install rustfmt"
+        run: rustup component add rustfmt
+      - name: "Check formatting"
+        run: cargo +nightly fmt --all -- --check
diff --git a/Cargo-minimal.lock b/Cargo-minimal.lock
new file mode 100644
index 0000000..c03dd59
--- /dev/null
+++ b/Cargo-minimal.lock
@@ -0,0 +1,367 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
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+ "hex-conservative",
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diff --git a/Cargo-recent.lock b/Cargo-recent.lock
new file mode 100644
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diff --git a/contrib/crates.sh b/contrib/crates.sh
new file mode 100755
index 0000000..6d11595
--- /dev/null
+++ b/contrib/crates.sh
@@ -0,0 +1,8 @@
+# No shebang, this file should not be executed.
+# shellcheck disable=SC2148
+#
+# disable verify unused vars, despite the fact that they are used when sourced
+# shellcheck disable=SC2034
+
+# Crates in this workspace to test (excl. fuzz an integration-tests).
+CRATES=(".")                    # Non-workspaces don't have crates.
diff --git a/contrib/test.sh b/contrib/test.sh
deleted file mode 100755
index 4f314df..0000000
--- a/contrib/test.sh
+++ /dev/null
@@ -1,86 +0,0 @@
-#!/usr/bin/env bash
-
-set -ex
-
-FEATURES="serde base64"
-
-cargo --version
-rustc --version
-
-# Work out if we are using a nightly toolchain.
-NIGHTLY=false
-if cargo --version | grep nightly >/dev/null; then
-    NIGHTLY=true
-fi
-
-# Make all cargo invocations verbose.
-export CARGO_TERM_VERBOSE=true
-
-# Defaults / sanity checks.
-cargo build
-cargo test
-
-if [ "$DO_LINT" = true ]
-then
-    cargo clippy --all-features --all-targets -- -D warnings
-    cargo clippy --example v0 -- -D warnings
-    cargo clippy --example v2 -- -D warnings
-    cargo clippy --example v2-separate-creator-constructor -- -D warnings
-fi
-
-# Test without any features other than std first (same as default)
-cargo build --no-default-features --features="std"
-cargo test --no-default-features --features="std"
-
-# Test each feature with default enabled ("std").
-for feature in ${FEATURES}
-do
-    cargo build --features="$feature"
-    cargo test --features="$feature"
-done
-
-cargo build --all-features
-cargo test --all-features
-
-cargo run --example v0
-cargo run --example v2
-cargo run --example v2-separate-creator-constructor
-
-if [ "$DO_NO_STD" = true ]
-then
-    # Build no_std, to make sure that cfg(test) doesn't hide any issues
-    cargo build --no-default-features
-
-    # Test no_std
-    cargo test --no-default-features
-
-    # Build all features
-    cargo build --no-default-features --features="$FEATURES"
-
-    # Build specific features
-    for feature in ${FEATURES}
-    do
-        cargo build --no-default-features --features="$feature"
-    done
-fi
-
-# Build the docs if told to (this only works with the nightly toolchain)
-if [ "$DO_DOCSRS" = true ]; then
-    RUSTDOCFLAGS="--cfg docsrs -D warnings -D rustdoc::broken-intra-doc-links" cargo +nightly doc --all-features
-fi
-
-# Build the docs with a stable toolchain, in unison with the DO_DOCSRS command
-# above this checks that we feature guarded docs imports correctly.
-if [ "$DO_DOCS" = true ]; then
-    RUSTDOCFLAGS="-D warnings" cargo +stable doc --all-features
-fi
-
-# Run formatter if told to.
-if [ "$DO_FMT" = true ]; then
-    if [ "$NIGHTLY" = false ]; then
-        echo "DO_FMT requires a nightly toolchain (consider using RUSTUP_TOOLCHAIN)"
-        exit 1
-    fi
-    rustup component add rustfmt
-    cargo fmt --check
-fi
diff --git a/contrib/test_vars.sh b/contrib/test_vars.sh
new file mode 100644
index 0000000..5ad5442
--- /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="rand-std serde base64 miniscript-std"
+
+# Test all these features without "std" enabled.
+FEATURES_WITHOUT_STD="rand serde base64 miniscript-no-std"
+
+# Run these examples.
+EXAMPLES="v0:std v2:std v2-separate-creator-constructor:std"
diff --git a/nightly-version b/nightly-version
new file mode 100644
index 0000000..c853ece
--- /dev/null
+++ b/nightly-version
@@ -0,0 +1 @@
+nightly-2024-08-18