diff --git a/.github/workflows/README.md b/.github/workflows/README.md
new file mode 100644
index 00000000..c7036ee5
--- /dev/null
+++ b/.github/workflows/README.md
@@ -0,0 +1,24 @@
+# rust-miniscript 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. Total 11 jobs.
+
+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`
+11. `Arch32bit`
+12. `Cross`
diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 3e4f1f8f..85e221a3 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -1,99 +1,220 @@
-on: [push, pull_request]
+---   # rust-miniscript CI: If you edit this file please update README.md
+on:   # yamllint disable-line rule:truthy
+  push:
+    branches:
+      - master
+      - 'test-ci/**'
+  pull_request:
 
 name: Continuous integration
 
 jobs:
-  Stable:
+  Prepare:
+    runs-on: ubuntu-latest
+    outputs:
+      nightly_version: ${{ steps.read_toolchain.outputs.nightly_version }}
+    steps:
+      - name: Checkout Crate
+        uses: actions/checkout@v4
+      - name: Read nightly version
+        id: read_toolchain
+        run: echo "nightly_version=$(cat nightly-version)" >> $GITHUB_OUTPUT
+
+  Stable:                       # 2 jobs, one per lock file.
     name: Test - stable toolchain
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
+      matrix:
+        dep: [minimal, recent]
     steps:
-      - name: Checkout Crate
-        uses: actions/checkout@v3
-      - name: Checkout Toolchain
-        # https://github.com/dtolnay/rust-toolchain
+      - name: "Checkout repo"
+        uses: actions/checkout@v4
+      - name: "Checkout maintainer tools"
+        uses: actions/checkout@v4
+        with:
+          repository: rust-bitcoin/rust-bitcoin-maintainer-tools
+          rev: b2ac115
+          path: maintainer-tools
+      - name: "Select toolchain"
         uses: dtolnay/rust-toolchain@stable
-      - name: Running test script
-        env:
-          DO_LINT: true
-          DO_DOCS: true
-          DO_FEATURE_MATRIX: true
-        run: ./contrib/test.sh
+      - name: "Set dependencies"
+        run: cp Cargo-${{ 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
-        uses: actions/checkout@v3
-      - name: Checkout Toolchain
-        uses: dtolnay/rust-toolchain@beta
-      - name: Running test script
-        run: ./contrib/test.sh
+      - 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: ${{ needs.Prepare.outputs.nightly_version }}
+      - name: "Set dependencies"
+        run: cp Cargo-${{ 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 - 1.48.0 toolchain
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
+      matrix:
+        dep: [minimal, recent]
     steps:
-      - name: Checkout Crate
-        uses: actions/checkout@v3
-      - name: Checkout Toolchain
-        uses: dtolnay/rust-toolchain@nightly
-      - name: Running test script
-        env:
-          DO_FMT: true
-          DO_DOCSRS: true
-        run: ./contrib/test.sh
+      - 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
+        with:
+          toolchain: "1.48.0"
+      - 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 - 1.48.0 toolchain
+  Lint:
+    name: Lint - nightly toolchain
+    needs: Prepare
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
+      matrix:
+        dep: [recent]
     steps:
-      - name: Checkout Crate
-        uses: actions/checkout@v3
-      - name: Checkout Toolchain
-        uses: dtolnay/rust-toolchain@1.48.0
-      - name: Running test script
-        env:
-          DO_FEATURE_MATRIX: true
-        run: ./contrib/test.sh
+      - 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: ${{ needs.Prepare.outputs.nightly_version }}
+      - name: "Install clippy"
+        run: rustup component add clippy
+      - name: "Set dependencies"
+        run: cp Cargo-${{ 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:
+          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 jobs, run cargo fmt directly.
+    name: Format - nightly toolchain
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+    steps:
+      - name: "Checkout repo"
+        uses: actions/checkout@v4
+      - name: "Select toolchain"
+        uses: dtolnay/rust-toolchain@nightly
+      - name: "Install rustfmt"
+        run: rustup component add rustfmt
+      - name: "Check formatting"
+        run: cargo +nightly fmt --all -- --check
 
   Arch32bit:
     name: Test 32-bit version
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout Crate
-        uses: actions/checkout@v3
-      - name: Checkout Toolchain
+      - name: "Checkout repo"
+        uses: actions/checkout@v4
+      - name: "Select toolchain"
         uses: dtolnay/rust-toolchain@stable
-      - name: Add architecture i386
+      - name: "Add architecture i386"
         run: sudo dpkg --add-architecture i386
-      - name: Install i686 gcc
+      - name: "Install i686 gcc"
         run: sudo apt-get update -y && sudo apt-get install -y gcc-multilib
-      - name: Install target
+      - name: "Install target"
         run: rustup target add i686-unknown-linux-gnu
-      - name: Run test on i686
+      - name: "Run test on i686"
         run: cargo test --target i686-unknown-linux-gnu
 
   Cross:
-    name: Cross test
+    name: Cross test - stable toolchain
     if: ${{ !github.event.act }}
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout Crate
-        uses: actions/checkout@v3
-      - name: Checkout Toolchain
+      - name: "Checkout repo"
+        uses: actions/checkout@v4
+      - name: "Select toolchain"
         uses: dtolnay/rust-toolchain@stable
-      - name: Install target
+      - name: "Install target"
         run: rustup target add s390x-unknown-linux-gnu
-      - name: install cross
+      - name: "Install cross"
         run: cargo install cross --locked
-      - name: run cross test
+      - name: "Run cross test"
         run: cross test --target s390x-unknown-linux-gnu
diff --git a/Cargo-minimal.lock b/Cargo-minimal.lock
new file mode 100644
index 00000000..d9351dd3
--- /dev/null
+++ b/Cargo-minimal.lock
@@ -0,0 +1,298 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
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+[[package]]
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diff --git a/Cargo-recent.lock b/Cargo-recent.lock
new file mode 100644
index 00000000..d9351dd3
--- /dev/null
+++ b/Cargo-recent.lock
@@ -0,0 +1,298 @@
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+ "serde_json",
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diff --git a/Cargo.toml b/Cargo.toml
index 648cfab8..2b9e2ff1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -28,7 +28,7 @@ simple_uds = []
 # Enable Socks5 Proxy in transport
 proxy = ["socks"]
 
-
+      
 [dependencies]
 serde = { version = "1", features = ["derive"] }
 serde_json = { version = "1", features = [ "raw_value" ] }
diff --git a/contrib/crates.sh b/contrib/crates.sh
new file mode 100755
index 00000000..31a886cf
--- /dev/null
+++ b/contrib/crates.sh
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+# 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 ca335ba6..00000000
--- a/contrib/test.sh
+++ /dev/null
@@ -1,72 +0,0 @@
-#!/usr/bin/env bash
-
-set -ex
-
-FEATURES="simple_http simple_tcp simple_uds proxy"
-
-cargo --version
-rustc --version
-
-# Some tests require certain toolchain types.
-NIGHTLY=false
-if cargo --version | grep nightly; then
-    NIGHTLY=true
-fi
-
-# Pin dependencies as required if we are using MSRV toolchain.
-if cargo --version | grep "1\.48"; then
-    # 1.0.157 uses syn 2.0 which requires edition 2021
-    cargo update -p serde_json --precise 1.0.99
-    cargo update -p serde --precise 1.0.156
-    cargo update -p quote --precise 1.0.30
-    cargo update -p proc-macro2 --precise 1.0.63
-    cargo update -p byteorder --precise 1.4.3
-fi
-
-# Make all cargo invocations verbose
-export CARGO_TERM_VERBOSE=true
-
-# Defaults / sanity checks
-cargo build
-cargo test
-
-if [ "$DO_LINT" = true ]
-then
-    cargo clippy --all-features --all-targets -- -D warnings
-fi
-
-if [ "$DO_FEATURE_MATRIX" = true ]; then
-    cargo build --no-default-features
-    cargo test --no-default-features
-
-    # All features
-    cargo build --no-default-features --features="$FEATURES"
-    cargo test --no-default-features --features="$FEATURES"
-
-    # Single features
-    for feature in ${FEATURES}
-    do
-        cargo test --no-default-features --features="$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 00000000..72d3c963
--- /dev/null
+++ b/contrib/test_vars.sh
@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+# `rust-jsonrpc` does not have a std feature.
+FEATURES_WITH_STD=""
+
+# So this is the var to use for all tests.
+FEATURES_WITHOUT_STD="simple_http minreq_http simple_tcp simple_uds proxy"
+
+# Run these examples.
+EXAMPLES=""
diff --git a/contrib/whitelist_deps.sh b/contrib/whitelist_deps.sh
new file mode 100644
index 00000000..2b699fda
--- /dev/null
+++ b/contrib/whitelist_deps.sh
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+# Remove once we upgrade to `bitcoin v0.32.0`.
+DUPLICATE_DEPS=("bech32")
diff --git a/integration_test/Cargo.toml b/integration_test/Cargo.toml
index ab7d3575..eb5354ad 100644
--- a/integration_test/Cargo.toml
+++ b/integration_test/Cargo.toml
@@ -8,5 +8,5 @@ edition = "2018"
 jsonrpc = { path = "..", features = ["minreq_http"] }
 lazy_static = "1.4.0"
 log = "0.4"
-backtrace = "0.3.50"
+backtrace = "0.2.3"
 serde_json = { version = "1.0", features = ["raw_value"] }