diff --git a/.github/workflows/audit.yml b/.github/workflows/audit.yml
deleted file mode 100644
index 6143cca822..0000000000
--- a/.github/workflows/audit.yml
+++ /dev/null
@@ -1,19 +0,0 @@
-name: Audit
-
-on:
-  push:
-    paths:
-      - '**/Cargo.toml'
-      - '**/Cargo.lock'
-  schedule:
-    - cron: '0 0 * * 0' # Once per week
-
-jobs:
-
-  security_audit:
-    runs-on: ubuntu-20.04
-    steps:
-      - uses: actions/checkout@v2
-      - uses: actions-rs/audit-check@v1
-        with:
-          token: ${{ secrets.GITHUB_TOKEN }}
\ No newline at end of file
diff --git a/.github/workflows/code_coverage.yml b/.github/workflows/code_coverage.yml
index 54020bb90d..32d18f2123 100644
--- a/.github/workflows/code_coverage.yml
+++ b/.github/workflows/code_coverage.yml
@@ -6,52 +6,36 @@ jobs:
   Codecov:
     name: Code Coverage
     runs-on: ubuntu-latest
-    env:
-      RUSTFLAGS: "-Cinstrument-coverage"
-      RUSTDOCFLAGS: "-Cinstrument-coverage"
-      LLVM_PROFILE_FILE: "./target/coverage/%p-%m.profraw"
-
     steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-      - name: Install lcov tools
-        run: sudo apt-get install lcov -y
-      - name: Install Rust toolchain
-        uses: actions-rs/toolchain@v1
-        with:
-            toolchain: stable
-            override: true
-            profile: minimal
-            components: llvm-tools-preview
-      - name: Rust Cache
-        uses: Swatinem/rust-cache@v2.2.1
-      - name: Install grcov
-        run: if [[ ! -e ~/.cargo/bin/grcov ]]; then cargo install grcov; fi
-        # TODO: re-enable the hwi tests
-      - name: Build simulator image
-        run: docker build -t hwi/ledger_emulator ./ci -f ci/Dockerfile.ledger
-      - name: Run simulator image
-        run: docker run --name simulator --network=host hwi/ledger_emulator &
-      - name: Install Python
-        uses: actions/setup-python@v4
-        with:
-          python-version: '3.9'
-      - name: Install python dependencies
-        run: pip install hwi==2.1.1 protobuf==3.20.1
-      - name: Test
-        run: cargo test --all-features
-      - name: Make coverage directory
-        run: mkdir coverage
-      - name: Run grcov
-        run: grcov . --binary-path ./target/debug/ -s . -t lcov --branch --ignore-not-existing --keep-only '**/crates/**' --ignore '**/tests/**' --ignore '**/examples/**' -o ./coverage/lcov.info
-      - name: Generate HTML coverage report
-        run: genhtml -o coverage-report.html --ignore-errors source ./coverage/lcov.info
+      - name: checkout
+        uses: actions/checkout@v4
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@v5
+      # Cache Nix artifacts
+      - uses: DeterminateSystems/magic-nix-cache-action@v2
+      # Code Coverage
+      - name: Code Coverage
+        run: nix build -L .#ci.codeCoverage
+      - name: Ensure lcov.info exists
+        # it is result because of the $out in Nix
+        run: |
+          test -f result
+          cp result lcov.info
+          ls -lah lcov.info
       - name: Coveralls upload
-        uses: coverallsapp/github-action@master
+        uses: coverallsapp/github-action@v2
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
-      - name: Upload artifact
-        uses: actions/upload-artifact@v2
+          file: ./lcov.info
+          format: lcov
+          allow-empty: true
+          fail-on-error: true
+          compare-ref: ${{ github.base_ref }}
+          compare-sha: ${{ github.event.pull_request.base.sha}}
+      - name: Generate HTML coverage report
+        run: nix develop -L .#lcov --command bash -c "genhtml -o coverage-report.html --ignore-errors source lcov.info"
+      - name: Upload HTML coverage report
+        uses: actions/upload-artifact@v3
         with:
           name: coverage-report
           path: coverage-report.html
diff --git a/.github/workflows/cont_integration.yml b/.github/workflows/cont_integration.yml
index 3dfb9906c3..d80bba2158 100644
--- a/.github/workflows/cont_integration.yml
+++ b/.github/workflows/cont_integration.yml
@@ -4,126 +4,137 @@ name: CI
 
 jobs:
 
-  build-test:
-    name: Build and test
+  self-care:
+    name: Flake self-check
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        rust:
-          - version: stable
-            clippy: true
-          - version: 1.63.0 # MSRV
-        features:
-          - --no-default-features
-          - --all-features
     steps:
-      - name: checkout
-        uses: actions/checkout@v2
-      - name: Install Rust toolchain
-        uses: actions-rs/toolchain@v1
+      - uses: actions/checkout@v4
+      - name: Check Nix flake inputs
+        uses: DeterminateSystems/flake-checker-action@v5
         with:
-            toolchain: ${{ matrix.rust.version }}
-            override: true
-            profile: minimal
-      - name: Rust Cache
-        uses: Swatinem/rust-cache@v2.2.1
-      - name: Pin dependencies for MSRV
-        if: matrix.rust.version == '1.63.0'
-        run: |
-          cargo update -p zip --precise "0.6.2"
-          cargo update -p time --precise "0.3.20"
-          cargo update -p jobserver --precise "0.1.26"
-          cargo update -p home --precise "0.5.5"
-      - name: Build
-        run: cargo build ${{ matrix.features }}
-      - name: Test
-        run: cargo test ${{ matrix.features }}
+          fail-mode: true
 
-  check-no-std:
-    name: Check no_std
+  pre-commit-checks:
+    name: "Pre-commit checks: typos, pgp-signed and conventional commits"
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-      - name: Install Rust toolchain
-        uses: actions-rs/toolchain@v1
-        with:
-          toolchain: stable
-          override: true
-          profile: minimal
-          # target: "thumbv6m-none-eabi"
-      - name: Rust Cache
-        uses: Swatinem/rust-cache@v2.2.1
-      - name: Check bdk_chain
-        working-directory: ./crates/chain
-        # TODO "--target thumbv6m-none-eabi" should work but currently does not
-        run: cargo check --no-default-features --features bitcoin/no-std,miniscript/no-std,hashbrown
-      - name: Check bdk
-        working-directory: ./crates/bdk
-        # TODO "--target thumbv6m-none-eabi" should work but currently does not
-        run: cargo check --no-default-features --features bitcoin/no-std,miniscript/no-std,bdk_chain/hashbrown
-      - name: Check esplora
-        working-directory: ./crates/esplora
-        # TODO "--target thumbv6m-none-eabi" should work but currently does not
-        run: cargo check --no-default-features --features bitcoin/no-std,miniscript/no-std,bdk_chain/hashbrown
+      - name: checkout
+        uses: actions/checkout@v4
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@v5
+      # Cache Nix artifacts
+      - uses: DeterminateSystems/magic-nix-cache-action@v2
+      # Commit checks
+      - name: Pre-commit checks
+        run: nix build -L .#ci.pre-commit-check
 
-  check-wasm:
-    name: Check WASM
-    runs-on: ubuntu-20.04
-    env:
-      CC: clang-10
-      CFLAGS: -I/usr/include
+  rustfmt:
+    name: rustfmt
+    runs-on: ubuntu-latest
     steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-        # Install a recent version of clang that supports wasm32
-      - run: wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add - || exit 1
-      - run: sudo apt-get update || exit 1
-      - run: sudo apt-get install -y libclang-common-10-dev clang-10 libc6-dev-i386 || exit 1
-      - name: Install Rust toolchain
-        uses: actions-rs/toolchain@v1
-        with:
-            toolchain: stable
-            override: true
-            profile: minimal
-            target: "wasm32-unknown-unknown"
-      - name: Rust Cache
-        uses: Swatinem/rust-cache@v2.2.1
-      - name: Check bdk
-        working-directory: ./crates/bdk
-        run: cargo check --target wasm32-unknown-unknown --no-default-features --features bitcoin/no-std,miniscript/no-std,bdk_chain/hashbrown,dev-getrandom-wasm
-      - name: Check esplora
-        working-directory: ./crates/esplora
-        run: cargo check --target wasm32-unknown-unknown --no-default-features --features bitcoin/no-std,miniscript/no-std,bdk_chain/hashbrown,async
+      - name: checkout
+        uses: actions/checkout@v4
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@v5
+      # Cache Nix artifacts
+      - uses: DeterminateSystems/magic-nix-cache-action@v2
+      # Rustfmt
+      - name: Rustfmt
+        run: nix build -L .#ci.fmt
 
-  fmt:
-    name: Rust fmt
+  clippy:
+    name: clippy
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-      - name: Install Rust toolchain
-        uses: actions-rs/toolchain@v1
-        with:
-            toolchain: stable
-            override: true
-            profile: minimal
-            components: rustfmt
-      - name: Check fmt
-        run: cargo fmt --all -- --config format_code_in_doc_comments=true --check
+      - name: checkout
+        uses: actions/checkout@v4
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@v5
+      # Cache Nix artifacts
+      - uses: DeterminateSystems/magic-nix-cache-action@v2
+      # Clippy
+      - name: Clippy
+        run: nix build -L .#ci.clippy
 
-  clippy_check:
+  test-latest:
+    name: Build, test, check latest Rust
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v1
-      - uses: actions-rs/toolchain@v1
-        with:
-            toolchain: stable
-            components: clippy
-            override: true
-      - name: Rust Cache
-        uses: Swatinem/rust-cache@v2.2.1
-      - uses: actions-rs/clippy-check@v1
-        with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          args: --all-features --all-targets -- -D warnings
+      - name: checkout
+        uses: actions/checkout@v4
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@v5
+      # Cache Nix artifacts
+      - uses: DeterminateSystems/magic-nix-cache-action@v2
+      # Cache Builds
+      - name: Build and Cache latest Rust
+        run: nix build -L .
+      # Tests: latest
+      - name: Test workspace all-features latest
+        run: nix build -L .#ci.latest.all
+      - name: Test workspace no-default-features latest
+        run: nix build -L .#ci.latest.noDefault
+      - name: Test bdk no-std latest
+        run: nix build -L .#ci.latest.noStdBdk
+      - name: Test bdk_chain no-std latest
+        run: nix build -L .#ci.latest.noStdChain
+      - name: Test bdk_esplora no-std latest
+        run: nix build -L .#ci.latest.noStdEsplora
+
+  test-MSRV:
+    name: Build, test, check MSRV
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout
+        uses: actions/checkout@v4
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@v5
+      # Cache Nix artifacts
+      - uses: DeterminateSystems/magic-nix-cache-action@v2
+      # Cache Builds
+      - name: Build and Cache MSRV
+        run: nix build -L .#MSRV
+      # Tests: MSRV
+      - name: Test workspace all-features MSRV
+        run: nix build -L .#ci.MSRV.all
+      - name: Test workspace no-default-features MSRV
+        run: nix build -L .#ci.MSRV.noDefault
+      - name: Test bdk no-std MSRV
+        run: nix build -L .#ci.MSRV.noStdBdk
+      - name: Test bdk_chain no-std MSRV
+        run: nix build -L .#ci.MSRV.noStdChain
+      - name: Test bdk_esplora no-std MSRV
+        run: nix build -L .#ci.MSRV.noStdEsplora
+
+  check-WASM:
+    name: Build and check WASM
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout
+        uses: actions/checkout@v4
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@v5
+      # Cache Nix artifacts
+      - uses: DeterminateSystems/magic-nix-cache-action@v2
+      # Cache Builds
+      - name: Build and Cache WASM
+        run: nix build -L .#WASM
+      # Checks: WASM
+      - name: Check bdk WASM
+        run: nix build -L .#ci.WASM.bdk
+      - name: Check bdk_esplora WASM
+        run: nix build -L .#ci.WASM.esplora
+
+  audit:
+    name: Audit based on rustsec/advisory-db
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout
+        uses: actions/checkout@v4
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@v5
+      # Cache Nix artifacts
+      - uses: DeterminateSystems/magic-nix-cache-action@v2
+      # Audit
+      - name: Audit
+        run: nix build -L .#ci.audit
diff --git a/.github/workflows/nightly_docs.yml b/.github/workflows/nightly_docs.yml
index 0321cc5337..974841d396 100644
--- a/.github/workflows/nightly_docs.yml
+++ b/.github/workflows/nightly_docs.yml
@@ -7,22 +7,16 @@ jobs:
     name: Build docs
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout sources
-        uses: actions/checkout@v2
-      - name: Set default toolchain
-        run: rustup default nightly-2022-12-14
-      - name: Set profile
-        run: rustup set profile minimal
-      - name: Update toolchain
-        run: rustup update
-      - name: Rust Cache
-        uses: Swatinem/rust-cache@v2.2.1
+      - name: checkout
+        uses: actions/checkout@v4
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@v5
+      # Cache Nix artifacts
+      - uses: DeterminateSystems/magic-nix-cache-action@v2
       - name: Build docs
-        run: cargo doc --no-deps
-        env:
-          RUSTDOCFLAGS: '--cfg docsrs -Dwarnings'
+        run: nix develop -L .#docsNightly --command bash -c "cargo doc --no-deps"
       - name: Upload artifact
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           name: built-docs
           path: ./target/doc/*
@@ -34,7 +28,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout `bitcoindevkit.org`
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         with:
           ssh-key: ${{ secrets.DOCS_PUSH_SSH_KEY }}
           repository: bitcoindevkit/bitcoindevkit.org
@@ -44,14 +38,14 @@ jobs:
       - name: Remove old latest
         run: rm -rf ./docs/.vuepress/public/docs-rs/bdk/nightly/latest
       - name: Download built docs
-        uses: actions/download-artifact@v1
+        uses: actions/download-artifact@v3
         with:
           name: built-docs
           path: ./docs/.vuepress/public/docs-rs/bdk/nightly/latest
       - name: Configure git
         run: git config user.email "github-actions@github.com" && git config user.name "github-actions"
       - name: Commit
-        continue-on-error: true         # If there's nothing to commit this step fails, but it's fine
+        continue-on-error: true # If there's nothing to commit this step fails, but it's fine
         run: git add ./docs/.vuepress/public/docs-rs && git commit -m "Publish autogenerated nightly docs"
       - name: Push
         run: git push origin master
diff --git a/.github/workflows/update_flake_lock.yml b/.github/workflows/update_flake_lock.yml
new file mode 100644
index 0000000000..62934d25bc
--- /dev/null
+++ b/.github/workflows/update_flake_lock.yml
@@ -0,0 +1,21 @@
+name: Update Flake Lock File
+on:
+  workflow_dispatch: # allows manual triggering
+  schedule:
+    - cron: '0 0 * * 0' # runs weekly on Sunday at 00:00
+
+jobs:
+  lockfile:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@v5
+      - name: Update flake.lock
+        uses: DeterminateSystems/update-flake-lock@v20
+        with:
+          pr-title: "ci: update flake.lock" # Title of PR to be created
+          pr-labels: |                      # Labels to be set on the PR
+            dependencies
+            automated
diff --git a/.gitignore b/.gitignore
index 95285763a3..35e59ccad8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,9 +1,12 @@
 /target
-Cargo.lock
 /.vscode
+/result
 
 *.swp
 .idea
 
 # Example persisted files.
 *.db
+
+# pre-commit-hooks.nix
+.pre-commit-config.yaml
diff --git a/.typos.toml b/.typos.toml
new file mode 100644
index 0000000000..72da312faa
--- /dev/null
+++ b/.typos.toml
@@ -0,0 +1,7 @@
+[default]
+extend-ignore-re = [
+  "\\b[0-9A-Za-z+/]{91}(=|==)?\\b",  # base64 strings
+  "[0-9a-fA-F]{7,}",                 # git commit hashes
+  "\\b[0-9A-Za-z+/]{33,}(=|==)?\\b", # SHA/tpub/adresses etc strings
+  "flate2",                          # crate
+]
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 6a83ccf575..a4cff173c9 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -13,7 +13,7 @@ Any bug may cost users real money. That being said, we deeply welcome people
 contributing for the first time to an open source project or picking up Rust while
 contributing. Don't be shy, you'll learn.
 
-Communications Channels
+Communication Channels
 -----------------------
 
 Communication about BDK happens primarily on the [BDK Discord](https://discord.gg/dstn4dQ).
@@ -31,8 +31,8 @@ facilitates social contribution, easy testing and peer review.
 To contribute a patch, the workflow is as follows:
 
   1. Fork Repository
-  2. Create topic branch
-  3. Commit patches
+  1. Create topic branch
+  1. Commit patches
 
 In general commits should be atomic and diffs should be easy to read.
 For this reason do not mix any formatting fixes or code moves with actual code
@@ -48,15 +48,36 @@ hesitate to split it into multiple small, focused PRs.
 
 The Minimal Supported Rust Version is **1.57.0** (enforced by our CI).
 
-Commits should cover both the issue fixed and the solution's rationale.
-These [guidelines](https://chris.beams.io/posts/git-commit/) should be kept in mind. Commit messages should follow the ["Conventional Commits 1.0.0"](https://www.conventionalcommits.org/en/v1.0.0/) to make commit histories easier to read by humans and automated tools. 
-
 To facilitate communication with other contributors, the project is making use
 of GitHub's "assignee" field. First check that no one is assigned and then
 comment suggesting that you're working on it. If someone is already assigned,
 don't hesitate to ask if the assigned party or previous commenter are still
 working on it if it has been awhile.
 
+Our CI can be replicated locally with Nix.
+Just run `nix flake check`.
+Our Nix setup can greatly increase developer experience
+and onboarding of new contributors.
+Please check the [`NIX.md`](NIX.md) for details
+on how to install Nix and why we use it.
+
+Commit policy
+-------------
+
+Commits should cover both the issue fixed and the solution's rationale.
+These [guidelines](https://chris.beams.io/posts/git-commit/) should be kept in mind.
+
+We enforce two commit styles in our CI:
+
+1. Commits should be signed with GPG using a key with a valid email address.
+1. Commit messages should follow the ["Conventional Commits 1.0.0"](https://www.conventionalcommits.org/en/v1.0.0/)
+   to make commit histories easier to read by humans and automated tools.
+   Commits starting with `Merge ...` which GitHub automatically generates
+   are exempt from this rule.
+
+You can use Nix to automatically and easily check locally these rules before commit and push events.
+Please check the [`NIX.md`](NIX.md) for details.
+
 Deprecation policy
 ------------------
 
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000000..6c058b672b
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,2314 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "addr2line"
+version = "0.21.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a30b2e23b9e17a9f90641c7ab1549cd9b44f296d3ccbf309d2863cfe398a0cb"
+dependencies = [
+ "gimli",
+]
+
+[[package]]
+name = "adler"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+
+[[package]]
+name = "ahash"
+version = "0.4.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0453232ace82dee0dd0b4c87a59bd90f7b53b314f3e0f61fe2ee7c8a16482289"
+
+[[package]]
+name = "anyhow"
+version = "1.0.79"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "080e9890a082662b09c1ad45f567faeeb47f22b5fb23895fbe1e651e718e25ca"
+
+[[package]]
+name = "assert_matches"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b34d609dfbaf33d6889b2b7106d3ca345eacad44200913df5ba02bfd31d2ba9"
+
+[[package]]
+name = "async-trait"
+version = "0.1.77"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c980ee35e870bd1a4d2c8294d4c04d0499e67bca1e4b5cefcc693c2fa00caea9"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.48",
+]
+
+[[package]]
+name = "atty"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
+dependencies = [
+ "hermit-abi 0.1.19",
+ "libc",
+ "winapi 0.3.9",
+]
+
+[[package]]
+name = "autocfg"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
+
+[[package]]
+name = "backtrace"
+version = "0.3.69"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2089b7e3f35b9dd2d0ed921ead4f6d318c27680d4a5bd167b3ee120edb105837"
+dependencies = [
+ "addr2line",
+ "cc",
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diff --git a/Cargo.toml b/Cargo.toml
index 0e1efc902f..2aab8d1621 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,22 +1,30 @@
 [workspace]
 resolver = "2"
 members = [
-    "crates/bdk",
-    "crates/chain",
-    "crates/file_store",
-    "crates/electrum",
-    "crates/esplora",
-    "crates/bitcoind_rpc",
-    "example-crates/example_cli",
-    "example-crates/example_electrum",
-    "example-crates/example_esplora",
-    "example-crates/example_bitcoind_rpc_polling",
-    "example-crates/wallet_electrum",
-    "example-crates/wallet_esplora_blocking",
-    "example-crates/wallet_esplora_async",
-    "nursery/tmp_plan",
-    "nursery/coin_select"
+  "crates/bdk",
+  "crates/chain",
+  "crates/file_store",
+  "crates/electrum",
+  "crates/esplora",
+  "crates/bitcoind_rpc",
+  "example-crates/example_cli",
+  "example-crates/example_electrum",
+  "example-crates/example_esplora",
+  "example-crates/example_bitcoind_rpc_polling",
+  "example-crates/wallet_electrum",
+  "example-crates/wallet_esplora_blocking",
+  "example-crates/wallet_esplora_async",
+  "nursery/tmp_plan",
+  "nursery/coin_select",
 ]
 
 [workspace.package]
 authors = ["Bitcoin Dev Kit Developers"]
+
+[profile.dev]
+
+[profile.ci]
+inherits = "dev"
+debug = 1
+incremental = false
+lto = "off"
diff --git a/CargoMSRV.lock b/CargoMSRV.lock
new file mode 100644
index 0000000000..105b681e28
--- /dev/null
+++ b/CargoMSRV.lock
@@ -0,0 +1,2314 @@
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diff --git a/NIX.md b/NIX.md
new file mode 100644
index 0000000000..d6fdf69d4f
--- /dev/null
+++ b/NIX.md
@@ -0,0 +1,181 @@
+# BDK's Nix Guidelines
+
+This document outlines:
+
+1. What is Nix and how to install.
+1. BDK's Nix-based tests and CI.
+1. Developer best-practices with Nix.
+1. How to run replicate CI tests locally.
+
+## Nix
+
+We use [Nix](https://nixos.org/) as the CI tool for BDK and also as a
+development environment for the project.
+Nix is purely functional.
+Everything is described as an expression/function,
+taking some inputs and producing deterministic outputs.
+This guarantees reproducible results and makes caching everything easy.
+Nix expressions are lazy. Anything described in Nix code will only be executed
+if some other expression needs its results.
+This is very powerful but somewhat unnatural for developers not familiar
+with functional programming.
+
+There are several resources to get started with Nix:
+
+- [NixOS Wiki](https://nixos.wiki/).
+- [Nix Reference Manual](https://nixos.org/manual/nix/stable/).
+- [`nixpkgs` Manual](https://nixos.org/manual/nixpkgs/stable/).
+- [Official documentation for getting things done with Nix](https://nix.dev/).
+
+There's also the [`nix-bitcoin` project](https://nixbitcoin.org/).
+
+To install Nix please follow the [official Nix documentation](https://nixos.org/manual/nix/stable/installation/installation.html).
+You may need to enable Flakes support, check the instructions at [NixOS Wiki entry on Flakes](https://nixos.wiki/wiki/Flakes).
+
+## Why are we using Nix
+
+We want to make BDK's development easier.
+This means two things:
+
+1. Enhance developer experience.
+1. Facilitate onboarding of new contributors.
+
+Both of these can be accomplished with Nix.
+
+BDK has many crates in the workspace,
+and proper development and testing needs dependencies to be installed,
+and environment variables to be set.
+This can be daunting for new contributors.
+
+BDK needs several Rust versions with different compilation targets.
+This can be cumbersome to install, but also needs proper maintainability,
+since these versions need to be updated frequently.
+
+BDK enforces commit styles and commit policies (please check [CONTRIBUTING.md](CONTRIBUTING.md)).
+This is difficult to enforce locally
+and can be a source of frustration during contribution reviews,
+potentially leading to a lot of wasted time and pushing new contributors away.
+
+Finally, BDK has a lot of tests and checks.
+It is difficult to replicate these locally.
+
+All the above can easily be accomplished with Nix.
+Nix is available for macOS, Linux, and Windows;
+while also being easy to install.
+Nix has a rich [community](https://nixos.org/community/) and one can find help
+on the [Nix's Forums](https://discourse.nixos.org/),
+[Nix's Discord](https://discord.gg/RbvHtGa),
+and [Nix's Matrix channel](https://matrix.to/#/#community:nixos.org).
+Additionally, Nix issues and errors can be searched in any search engine,
+and in the [Nix's stackoverflow](https://stackoverflow.com/questions/tagged/nix+or+nixpkgs+or+nixos+or+nixops).
+
+## BDK's Nix-based tests and CI
+
+**TLDR: To replicate everything that our CI checks just do `nix flake check`**.
+
+BDK's tests and checks are run using Nix.
+If you want to run the tests locally, you can do so with:
+
+```text
+nix flake -L check --keep-failed
+```
+
+The `-L` flag prints full build logs on standard error.
+This is good for debugging.
+The `--keep-failed` flag keep temporary directories of failed builds.
+This can be useful for caching intermediate results while fixing failed checks.
+
+Under the hood `nix flake check` does the following:
+
+- Checks for typos, GPG-signed and conventional commits, `rustfmt`, `nixpkgs-fmt` (`.nix` files).
+- Runs `cargo clippy` in all workspace.
+- Runs `cargo fmt` in all workspace.
+- Checks dependencies for security advisory using [`rustsec/advisory-db`](https://github.com/rustsec/advisory-db).
+- `cargo build` and `cargo test` in whole workspace using the latest Rust version.
+- `cargo build` and `cargo test` in whole workspace using the MSRV Rust version.
+- `cargo build` and `cargo check` WASM targets using the latest Rust version
+   on `bdk` and `bdk_esplora` crates.
+
+The checks are by default cached by Nix and subsequent runs use the cached results,
+respecting the Nix derivations' dependency graph.
+
+All the necessary dependencies, e.g. `bitcoind` and `esplora`,
+along with all necessary environment variables,
+are installed and available in the environment that Nix's checks runs in.
+
+Individual checks from the above list can be listed with `nix flake show`
+and will be displayed under the `checks` tree.
+You can run an individual check with:
+
+```text
+nix build -L .#checks.SYSTEM.CHECK --keep-failed
+```
+
+Where `SYSTEM` is the system you are running on,
+and `CHECK` is the name of the check you want to run.
+For example, in a MacOS Apple Silicon machine (`aarch64-darwin`)
+ and for the `clippy` check you can run:
+
+```text
+nix build -L .#checks.aarch64-darwin.clippy --keep-failed
+```
+
+We also group all the CI checks inside the `legacyPackages`.
+These can be viewed in the `flake.nix` file under the `legacyPackages.ci` set.
+You can run any of these with:
+
+```text
+nix build -L .#ci.CHECK --keep-failed
+```
+
+Where `CHECK` is the name of the check you want to run.
+For example to run the `pre-commit-check`:
+
+```text
+nix build -L .#ci.pre-commit-check --keep-failed
+```
+
+You can check all the tests that our CI performs by inspecting both
+the `flake.nix` and `.github/workflows/cont_integration.yml` files.
+
+## Developer best-practices with Nix
+
+We provide several development shells,
+also called `devShell`s,
+that assist developers with the necessary dependency and environment
+to develop and test BDK.
+
+To access these shells, you can run:
+
+```text
+nix develop .#SHELL
+```
+
+Where `SHELL` is the name of the `devShell` you want to use.
+We provide the following shells:
+
+- default: latest Rust, you can omit the `#SHELL` and just run `nix develop .`.
+- `MSRV`: MSRV Rust version.
+- `WASM`: latest Rust with WASM compilation support.
+
+All of these `devShell`s handle all the necessary dependencies and environment variables needed.
+They also provide pre-commit git hooks that checks either during commit or push events the following:
+
+- GPG-signed commits (on a `git push` event).
+- Conventional commit style commit messages (on a `git commit` event).
+- `nixpkgs-fmt` adherence (on a `git commit` event).
+- Typos in the commit content (on a `git commit` event).
+
+Regarding the typos check, there might be some false positives.
+In that case you can add a regex rule to filter out the typos in the `.typos.toml` file.
+We already included all the false positives we've found so far with some explainable comments.
+Hence, you should be able to follow the examples and add your own.
+Additionally, you can find more information in [`crate-ci/typos`](https://github.com/crate-ci/typos).
+
+As a final note on the `devShell`s, they can be conveniently automated with
+[`nix-community/nix-direnv`](https://github/nix-community/nix-direnv).
+`nix-direnv`, once installed, will:
+
+- Enable shell completion in `devShell`s.
+- Seamless integrate pre-commit checks even outside a `devShell`.
+- Improved caching of `devShell`s.
diff --git a/README.md b/README.md
index 8ecd764e28..895fe49db4 100644
--- a/README.md
+++ b/README.md
@@ -44,6 +44,7 @@ The project is split up into several crates in the `/crates` directory:
 - [`file_store`](./crates/file_store): A (experimental) persistence backend for storing chain data in a single file.
 - [`esplora`](./crates/esplora): Extends the [`esplora-client`] crate with methods to fetch chain data from an esplora HTTP server in the form that [`bdk_chain`] and `Wallet` can consume.
 - [`electrum`](./crates/electrum): Extends the [`electrum-client`] crate with methods to fetch chain data from an electrum server in the form that [`bdk_chain`] and `Wallet` can consume.
+- [`bitcond_rpc`](./crates/bitcond_rpc) Emitting blockchain data from the `bitcoind` RPC interface.
 
 Fully working examples of how to use these components are in `/example-crates`:
 - [`example_cli`](./example-crates/example_cli): Library used by the `example_*` crates. Provides utilities for syncing, showing the balance, generating addresses and creating transactions without using the bdk `Wallet`.
@@ -59,6 +60,12 @@ Fully working examples of how to use these components are in `/example-crates`:
 [`electrum-client`]: https://docs.rs/electrum-client/
 [`bdk_chain`]: https://docs.rs/bdk-chain/
 
+## Dependencies
+
+- `bitcoind_rpc` depends on `bitcoind` being installed and available in `PATH` or in the `BITCOIND_EXEC` ENV variable.
+- `esplora` depends on [Blockstream's version of `electrs`](https://github.com/Blockstream/electrs)
+   being installed and available in `PATH` or in the `ELECTRS_EXEC` ENV variable.
+
 ## Minimum Supported Rust Version (MSRV)
 This library should compile with any combination of features with Rust 1.63.0.
 
diff --git a/ci/commits_verify_signature.sh b/ci/commits_verify_signature.sh
new file mode 100755
index 0000000000..5f11190a72
--- /dev/null
+++ b/ci/commits_verify_signature.sh
@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+# Function to verify the signature of the last commit
+verify_signature() {
+	local commit_hash
+  commit_hash=$(git rev-parse HEAD)
+	if ! git verify-commit "$commit_hash"; then
+		echo "Error: Last commit ($commit_hash) is not signed."
+		exit 1
+	fi
+}
+
+# Verify the signature of the last commit
+verify_signature
+
+# Allow the push to proceed if the signature is valid
+exit 0
diff --git a/crates/bdk/Cargo.toml b/crates/bdk/Cargo.toml
index 57c2090047..12e54d01bc 100644
--- a/crates/bdk/Cargo.toml
+++ b/crates/bdk/Cargo.toml
@@ -13,6 +13,7 @@ edition = "2021"
 rust-version = "1.63"
 
 [dependencies]
+log = "^0.4"
 rand = "^0.8"
 miniscript = { version = "10.0.0", features = ["serde"], default-features = false }
 bitcoin = { version = "0.30.0", features = ["serde", "base64", "rand-std"], default-features = false }
@@ -21,12 +22,13 @@ serde_json = { version = "^1.0" }
 bdk_chain = { path = "../chain", version = "0.6.0", features = ["miniscript", "serde"], default-features = false }
 
 # Optional dependencies
-hwi = { version = "0.7.0", optional = true, features = [ "miniscript"] }
+hwi = { version = "0.7.0", optional = true, features = ["miniscript"] }
 bip39 = { version = "1.0.1", optional = true }
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
 getrandom = "0.2"
 js-sys = "0.3"
+bitcoin = { version = "0.30.0", features = ["no-std"] }
 
 [features]
 default = ["std"]
diff --git a/crates/bitcoind_rpc/Cargo.toml b/crates/bitcoind_rpc/Cargo.toml
index bc629854e4..ebbcca96a0 100644
--- a/crates/bitcoind_rpc/Cargo.toml
+++ b/crates/bitcoind_rpc/Cargo.toml
@@ -19,7 +19,7 @@ bitcoincore-rpc = { version = "0.17" }
 bdk_chain = { path = "../chain", version = "0.6", default-features = false }
 
 [dev-dependencies]
-bitcoind = { version = "0.33", features = ["25_0"] }
+bitcoind = "0.33"
 anyhow = { version = "1" }
 
 [features]
diff --git a/crates/bitcoind_rpc/README.md b/crates/bitcoind_rpc/README.md
index 12de87020d..0421c90ada 100644
--- a/crates/bitcoind_rpc/README.md
+++ b/crates/bitcoind_rpc/README.md
@@ -1,3 +1,7 @@
 # BDK Bitcoind RPC
 
 This crate is used for emitting blockchain data from the `bitcoind` RPC interface.
+
+## Dependencies
+
+`bitcoind_rpc` depends on `bitcoind` being installed and available in `PATH` or in the `BITCOIND_EXEC` ENV variable.
diff --git a/crates/bitcoind_rpc/tests/test_emitter.rs b/crates/bitcoind_rpc/tests/test_emitter.rs
index 521124e5d8..74c2ed463e 100644
--- a/crates/bitcoind_rpc/tests/test_emitter.rs
+++ b/crates/bitcoind_rpc/tests/test_emitter.rs
@@ -1,3 +1,4 @@
+use core::panic;
 use std::collections::{BTreeMap, BTreeSet};
 
 use bdk_bitcoind_rpc::Emitter;
@@ -25,9 +26,9 @@ struct TestEnv {
 
 impl TestEnv {
     fn new() -> anyhow::Result<Self> {
-        let daemon = match std::env::var_os("TEST_BITCOIND") {
+        let daemon = match std::env::var_os("BITCOIND_EXEC") {
             Some(bitcoind_path) => bitcoind::BitcoinD::new(bitcoind_path),
-            None => bitcoind::BitcoinD::from_downloaded(),
+            None => panic!("Cannot find bitcoind daemon, set BITCOIND_EXEC environment variable with the path to bitcoind"),
         }?;
         let client = bitcoincore_rpc::Client::new(
             &daemon.rpc_url(),
diff --git a/crates/esplora/Cargo.toml b/crates/esplora/Cargo.toml
index 386941dbd7..7c6af64d2f 100644
--- a/crates/esplora/Cargo.toml
+++ b/crates/esplora/Cargo.toml
@@ -22,7 +22,7 @@ bitcoin = { version = "0.30.0", optional = true, default-features = false }
 miniscript = { version = "10.0.0", optional = true, default-features = false }
 
 [target.'cfg(not(target_arch = "wasm32"))'.dev-dependencies]
-electrsd = { version= "0.25.0", features = ["bitcoind_25_0", "esplora_a33e97e1", "legacy"] }
+electrsd = { version = "0.26.0", features = ["legacy"] }
 tokio = { version = "1", features = ["rt", "rt-multi-thread", "macros"] }
 
 [features]
diff --git a/crates/esplora/README.md b/crates/esplora/README.md
index 836cd7aae7..d6b07216ad 100644
--- a/crates/esplora/README.md
+++ b/crates/esplora/README.md
@@ -3,6 +3,11 @@
 BDK Esplora extends [`esplora-client`] to update [`bdk_chain`] structures
 from an Esplora server.
 
+## Dependencies
+
+`esplora` depends on [Blockstream's version of `electrs`](https://github.com/Blockstream/electrs)
+being installed and available in `PATH` or in the `ELECTRS_EXEC` ENV variable.
+
 ## Usage
 
 There are two versions of the extension trait (blocking and async).
diff --git a/crates/esplora/tests/async_ext.rs b/crates/esplora/tests/async_ext.rs
index 38833f588e..8cc1b34acf 100644
--- a/crates/esplora/tests/async_ext.rs
+++ b/crates/esplora/tests/async_ext.rs
@@ -1,6 +1,7 @@
 use bdk_esplora::EsploraAsyncExt;
 use electrsd::bitcoind::bitcoincore_rpc::RpcApi;
 use electrsd::bitcoind::{self, anyhow, BitcoinD};
+use electrsd::electrum_client::ElectrumApi;
 use electrsd::{Conf, ElectrsD};
 use esplora_client::{self, AsyncClient, Builder};
 use std::collections::{BTreeMap, HashSet};
@@ -20,15 +21,22 @@ struct TestEnv {
 impl TestEnv {
     fn new() -> Result<Self, anyhow::Error> {
         let bitcoind_exe =
-            bitcoind::downloaded_exe_path().expect("bitcoind version feature must be enabled");
-        let bitcoind = BitcoinD::new(bitcoind_exe).unwrap();
+            bitcoind::exe_path().expect("Cannot find bitcoind daemon, set BITCOIND_EXEC environment variable with the path to bitcoind");
+        let mut bitcoind_conf = bitcoind::Conf::default();
+        bitcoind_conf.p2p = bitcoind::P2P::Yes;
+        let bitcoind = BitcoinD::with_conf(bitcoind_exe, &bitcoind_conf)?;
 
         let mut electrs_conf = Conf::default();
         electrs_conf.http_enabled = true;
-        let electrs_exe =
-            electrsd::downloaded_exe_path().expect("electrs version feature must be enabled");
+        let electrs_exe = electrsd::exe_path().expect("Cannot find electrs daemon, set ELECTRS_EXEC environment variable with the path to electrs");
         let electrsd = ElectrsD::with_conf(electrs_exe, &bitcoind, &electrs_conf)?;
 
+        // Alive checks
+        bitcoind.client.ping().unwrap(); // without using bitcoind, it is dropped and all the rest fails.
+        electrsd.client.ping().unwrap();
+        assert!(bitcoind.client.ping().is_ok());
+        assert!(electrsd.client.ping().is_ok());
+
         let base_url = format!("http://{}", &electrsd.esplora_url.clone().unwrap());
         let client = Builder::new(base_url.as_str()).build_async()?;
 
diff --git a/crates/esplora/tests/blocking_ext.rs b/crates/esplora/tests/blocking_ext.rs
index 5a76172325..c09703bd02 100644
--- a/crates/esplora/tests/blocking_ext.rs
+++ b/crates/esplora/tests/blocking_ext.rs
@@ -1,6 +1,7 @@
 use bdk_esplora::EsploraExt;
 use electrsd::bitcoind::bitcoincore_rpc::RpcApi;
 use electrsd::bitcoind::{self, anyhow, BitcoinD};
+use electrsd::electrum_client::ElectrumApi;
 use electrsd::{Conf, ElectrsD};
 use esplora_client::{self, BlockingClient, Builder};
 use std::collections::{BTreeMap, HashSet};
@@ -20,15 +21,22 @@ struct TestEnv {
 impl TestEnv {
     fn new() -> Result<Self, anyhow::Error> {
         let bitcoind_exe =
-            bitcoind::downloaded_exe_path().expect("bitcoind version feature must be enabled");
-        let bitcoind = BitcoinD::new(bitcoind_exe).unwrap();
+            bitcoind::exe_path().expect("Cannot find bitcoind daemon, set BITCOIND_EXEC environment variable with the path to bitcoind");
+        let mut bitcoind_conf = bitcoind::Conf::default();
+        bitcoind_conf.p2p = bitcoind::P2P::Yes;
+        let bitcoind = BitcoinD::with_conf(bitcoind_exe, &bitcoind_conf)?;
 
         let mut electrs_conf = Conf::default();
         electrs_conf.http_enabled = true;
-        let electrs_exe =
-            electrsd::downloaded_exe_path().expect("electrs version feature must be enabled");
+        let electrs_exe = electrsd::exe_path().expect("Cannot find electrs daemon, set ELECTRS_EXEC environment variable with the path to electrs");
         let electrsd = ElectrsD::with_conf(electrs_exe, &bitcoind, &electrs_conf)?;
 
+        // Alive checks
+        bitcoind.client.ping().unwrap(); // without using bitcoind, it is dropped and all the rest fails.
+        electrsd.client.ping().unwrap();
+        assert!(bitcoind.client.ping().is_ok());
+        assert!(electrsd.client.ping().is_ok());
+
         let base_url = format!("http://{}", &electrsd.esplora_url.clone().unwrap());
         let client = Builder::new(base_url.as_str()).build_blocking()?;
 
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000000..66c1f8b8d4
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,283 @@
+{
+  "nodes": {
+    "advisory-db": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1703184318,
+        "narHash": "sha256-vx2/goSpegxiFc7e1jKNHzBkhnsIQjriV4GZLaVe17M=",
+        "owner": "rustsec",
+        "repo": "advisory-db",
+        "rev": "a5fb72de318a74eb69a2c241c0e46705684a35d0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "rustsec",
+        "repo": "advisory-db",
+        "type": "github"
+      }
+    },
+    "crane": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1698166613,
+        "narHash": "sha256-y4rdN4flxRiROqNi1waMYIZj/Fs7L2OrszFk/1ry9vU=",
+        "owner": "ipetkov",
+        "repo": "crane",
+        "rev": "b7db46f0f1751f7b1d1911f6be7daf568ad5bc65",
+        "type": "github"
+      },
+      "original": {
+        "owner": "ipetkov",
+        "repo": "crane",
+        "rev": "b7db46f0f1751f7b1d1911f6be7daf568ad5bc65",
+        "type": "github"
+      }
+    },
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1673956053,
+        "narHash": "sha256-4gtG9iQuiKITOjNQQeQIpoIB6b16fm+504Ch3sNKLd8=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "35bb57c0c8d8b62bbfd284272c928ceb64ddbde9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1701680307,
+        "narHash": "sha256-kAuep2h5ajznlPMD9rnQyffWG8EM/C73lejGofXvdM8=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "4022d587cbbfd70fe950c1e2083a02621806a725",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "flake-utils_2": {
+      "inputs": {
+        "systems": "systems_2"
+      },
+      "locked": {
+        "lastModified": 1685518550,
+        "narHash": "sha256-o2d0KcvaXzTrPRIo0kOLV0/QXHhDQ5DTi+OxcjO8xqY=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "a1720a10a6cfe8234c0e93907ffe81be440f4cef",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "gitignore": {
+      "inputs": {
+        "nixpkgs": [
+          "pre-commit-hooks",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1660459072,
+        "narHash": "sha256-8DFJjXG8zqoONA1vXtgeKXy68KdJL5UaXR8NtVMUbx8=",
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "rev": "a20de23b925fd8264fd7fad6454652e142fd7f73",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1704018918,
+        "narHash": "sha256-erjg/HrpC9liEfm7oLqb8GXCqsxaFwIIPqCsknW5aFY=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "2c9c58e98243930f8cb70387934daa4bc8b00373",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-23.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-bitcoind": {
+      "locked": {
+        "lastModified": 1696748673,
+        "narHash": "sha256-UbPHrH4dKN/66EpfFpoG4St4XZYDX9YcMVRQGWzAUNA=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "9957cd48326fe8dbd52fdc50dd2502307f188b0d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "9957cd48326fe8dbd52fdc50dd2502307f188b0d",
+        "type": "github"
+      }
+    },
+    "nixpkgs-kitman": {
+      "locked": {
+        "lastModified": 1677533122,
+        "narHash": "sha256-nYSQfuPruk5oAF0J7Pp3/Si3tS/H1lg4Rwi7QIbgDJ8=",
+        "owner": "jkitman",
+        "repo": "nixpkgs",
+        "rev": "61ccef8bc0a010a21ccdeb10a92220a47d8149ac",
+        "type": "github"
+      },
+      "original": {
+        "owner": "jkitman",
+        "repo": "nixpkgs",
+        "rev": "61ccef8bc0a010a21ccdeb10a92220a47d8149ac",
+        "type": "github"
+      }
+    },
+    "nixpkgs-stable": {
+      "locked": {
+        "lastModified": 1685801374,
+        "narHash": "sha256-otaSUoFEMM+LjBI1XL/xGB5ao6IwnZOXc47qhIgJe8U=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "c37ca420157f4abc31e26f436c1145f8951ff373",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-23.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "pre-commit-hooks": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "flake-utils": "flake-utils_2",
+        "gitignore": "gitignore",
+        "nixpkgs": "nixpkgs_2",
+        "nixpkgs-stable": "nixpkgs-stable"
+      },
+      "locked": {
+        "lastModified": 1703939133,
+        "narHash": "sha256-Gxe+mfOT6bL7wLC/tuT2F+V+Sb44jNr8YsJ3cyIl4Mo=",
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "rev": "9d3d7e18c6bc4473d7520200d4ddab12f8402d38",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "advisory-db": "advisory-db",
+        "crane": "crane",
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs",
+        "nixpkgs-bitcoind": "nixpkgs-bitcoind",
+        "nixpkgs-kitman": "nixpkgs-kitman",
+        "pre-commit-hooks": "pre-commit-hooks",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "flake-utils": [
+          "flake-utils"
+        ],
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1704507282,
+        "narHash": "sha256-PDfS8fj40mm2QWpbd/aiocgwcI/WHzqLKERRJkoEvXU=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "a127cccf7943beae944953963ba118d643299c3b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "systems_2": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000000..385ff05a93
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,428 @@
+{
+  description = "BDK Flake to run all tests locally and in CI";
+
+  inputs = {
+    # stable nixpkgs
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.05";
+    # pin bitcoind to a specific version
+    # find instructions here:
+    # <https://lazamar.co.uk/nix-versions>
+    # pinned to 0.25.0
+    nixpkgs-bitcoind.url = "github:nixos/nixpkgs?rev=9957cd48326fe8dbd52fdc50dd2502307f188b0d";
+    # Blockstream's esplora
+    # inspired by fedimint CI
+    nixpkgs-kitman.url = "github:jkitman/nixpkgs?rev=61ccef8bc0a010a21ccdeb10a92220a47d8149ac";
+    crane = {
+      url = "github:ipetkov/crane?rev=b7db46f0f1751f7b1d1911f6be7daf568ad5bc65";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs = {
+        nixpkgs.follows = "nixpkgs";
+        flake-utils.follows = "flake-utils";
+      };
+    };
+    flake-utils.url = "github:numtide/flake-utils";
+    advisory-db = {
+      url = "github:rustsec/advisory-db";
+      flake = false;
+    };
+    pre-commit-hooks.url = "github:cachix/pre-commit-hooks.nix";
+  };
+
+  outputs = { self, nixpkgs, nixpkgs-bitcoind, nixpkgs-kitman, crane, rust-overlay, flake-utils, advisory-db, pre-commit-hooks, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        overlays = [ (import rust-overlay) ];
+        lib = pkgs.lib;
+        stdenv = pkgs.stdenv;
+        isDarwin = stdenv.isDarwin;
+        libsDarwin = with pkgs.darwin.apple_sdk.frameworks; lib.optionals isDarwin [
+          # Additional darwin specific inputs can be set here
+          Security
+          SystemConfiguration
+          CoreServices
+        ];
+
+        pkgs = import nixpkgs {
+          inherit system overlays;
+        };
+        pkgs-bitcoind = import nixpkgs-bitcoind {
+          inherit system overlays;
+        };
+        pkgs-kitman = import nixpkgs-kitman {
+          inherit system;
+        };
+
+        # Signed Commits
+        signed-commits = pkgs.writeShellApplication {
+          name = "signed-commits";
+          runtimeInputs = [ pkgs.git ];
+          text = builtins.readFile ./ci/commits_verify_signature.sh;
+        };
+
+        # Toolchains
+        # latest stable
+        rustTarget = pkgs.rust-bin.stable.latest.default;
+        # we pin clippy instead of using "stable" so that our CI doesn't break
+        # at each new cargo release
+        rustClippyTarget = pkgs.rust-bin.stable."1.67.0".default;
+        # MSRV
+        rustMSRVTarget = pkgs.rust-bin.stable."1.63.0".default;
+        # WASM
+        rustWASMTarget = pkgs.rust-bin.stable.latest.default.override {
+          targets = [ "wasm32-unknown-unknown" ];
+        };
+        # LLVM code coverage
+        rustLLVMTarget = pkgs.rust-bin.stable.latest.default.override {
+          extensions = [ "llvm-tools" ];
+        };
+        # Nighly Docs
+        rustNightlyTarget = pkgs.rust-bin.selectLatestNightlyWith (toolchain: toolchain.default);
+
+        # Rust configs
+        craneLib = (crane.mkLib pkgs).overrideToolchain rustTarget;
+        # Clippy specific configs
+        craneClippyLib = (crane.mkLib pkgs).overrideToolchain rustClippyTarget;
+        # MSRV specific configs
+        # WASM specific configs
+        # craneUtils needs to be built using Rust latest (not MSRV/WASM)
+        # check https://github.com/ipetkov/crane/issues/422
+        craneMSRVLib = ((crane.mkLib pkgs).overrideToolchain rustMSRVTarget).overrideScope' (final: prev: { inherit (craneLib) craneUtils; });
+        craneWASMLib = ((crane.mkLib pkgs).overrideToolchain rustWASMTarget).overrideScope' (final: prev: { inherit (craneLib) craneUtils; });
+        # LLVM code coverage
+        craneLLVMLib = (crane.mkLib pkgs).overrideToolchain rustLLVMTarget;
+        craneNightlyLib = (crane.mkLib pkgs).overrideToolchain rustNightlyTarget;
+
+        # Common inputs for all derivations
+        buildInputs = [
+          # Add additional build inputs here
+          pkgs-bitcoind.bitcoind
+          pkgs-kitman.esplora
+          pkgs.openssl
+          pkgs.openssl.dev
+          pkgs.pkg-config
+          pkgs.curl
+          pkgs.libiconv
+        ] ++ libsDarwin;
+
+        # WASM deps
+        WASMInputs = [
+          # Additional wasm specific inputs can be set here
+          pkgs.llvmPackages_14.clang-unwrapped
+          pkgs.llvmPackages_14.stdenv
+          pkgs.llvmPackages_14.libcxxClang
+          pkgs.llvmPackages_14.libcxxStdenv
+        ];
+
+        nativeBuildInputs = [
+          # Add additional build inputs here
+          pkgs.python3
+        ] ++ lib.optionals isDarwin [
+          # Additional darwin specific native inputs can be set here
+        ];
+
+        # Common derivation arguments used for all builds
+        commonArgs = {
+          # When filtering sources, we want to allow assets other than .rs files
+          src = lib.cleanSourceWith {
+            src = ./.; # The original, unfiltered source
+            filter = path: type:
+              # esplora uses `.md` in the source code
+              (lib.hasSuffix "\.md" path) ||
+              # bitcoind_rpc uses `.db` in the source code
+              (lib.hasSuffix "\.db" path) ||
+              # Default filter from crane (allow .rs files)
+              (craneLib.filterCargoSources path type);
+          };
+
+          # Fixing name/version here to avoid warnings
+          # This does not interact with the versioning
+          # in any of bdk crates' Cargo.toml
+          pname = "crates";
+          version = "0.1.0";
+
+          inherit buildInputs;
+          inherit nativeBuildInputs;
+          # Additional environment variables can be set directly
+          BITCOIND_EXEC = "${pkgs.bitcoind}/bin/bitcoind";
+          ELECTRS_EXEC = "${pkgs-kitman.esplora}/bin/esplora";
+        };
+
+        # MSRV derivation arguments
+        MSRVArgs = {
+          cargoLock = ./CargoMSRV.lock;
+        };
+
+        # WASM derivation arguments
+        WASMArgs = {
+          CARGO_BUILD_TARGET = "wasm32-unknown-unknown";
+          buildInputs = buildInputs ++ WASMInputs;
+          inherit nativeBuildInputs;
+          # crane tries to run the WASM file as if it were a binary
+          doCheck = false;
+          # just build bdk for now
+          cargoExtraArgs = "--locked --target wasm32-unknown-unknown -p bdk --no-default-features --features bitcoin/no-std,miniscript/no-std,bdk_chain/hashbrown,dev-getrandom-wasm";
+          # env vars
+          CC = "${stdenv.cc.nativePrefix}cc";
+          AR = "${stdenv.cc.nativePrefix}ar";
+          CC_wasm32_unknown_unknown = "${pkgs.llvmPackages_14.clang-unwrapped}/bin/clang-14";
+          CFLAGS_wasm32_unknown_unknown = "-I ${pkgs.llvmPackages_14.libclang.lib}/lib/clang/14.0.6/include/";
+          AR_wasm32_unknown_unknown = "${pkgs.llvmPackages_14.llvm}/bin/llvm-ar";
+        };
+
+        buildDepsArgs = {
+          cargoBuildCommand = "cargo build --profile ci";
+        };
+
+
+        # Caching: build *just* cargo dependencies for all crates, so we can reuse
+        # all of that work (e.g. via cachix) when running in CI
+        # all artifacts from running cargo {build,check,test} will be cached
+        cargoArtifacts = craneLib.buildDepsOnly (commonArgs // buildDepsArgs);
+        cargoArtifactsMSRV = craneMSRVLib.buildDepsOnly (commonArgs // buildDepsArgs // MSRVArgs);
+        cargoArtifactsWASM = craneWASMLib.buildDepsOnly (commonArgs // buildDepsArgs // WASMArgs);
+        cargoArtifactsClippy = craneClippyLib.buildDepsOnly (commonArgs // buildDepsArgs);
+
+        # Run clippy on the workspace source,
+        # reusing the dependency artifacts (e.g. from build scripts or
+        # proc-macros) from above.
+        clippy = craneClippyLib.cargoClippy (commonArgs // {
+          cargoArtifacts = cargoArtifactsClippy;
+          cargoClippyExtraArgs = "--all-features --all-targets -- -D warnings";
+        });
+
+        # fmt
+        fmt = craneLib.cargoFmt (commonArgs // {
+          inherit cargoArtifacts;
+          cargoExtraArgs = "--all";
+          rustFmtExtraArgs = "--config format_code_in_doc_comments=true";
+        });
+      in
+      rec {
+        checks = {
+          inherit clippy;
+          inherit fmt;
+
+          # Latest
+          latest = packages.default;
+          latestAll = craneLib.cargoTest (commonArgs // {
+            inherit cargoArtifacts;
+            cargoTestExtraArgs = "--all-features -- --test-threads=2"; # bdk_bitcoind_rpc test spams bitcoind
+          });
+          latestNoDefault = craneLib.cargoTest (commonArgs // {
+            inherit cargoArtifacts;
+            cargoTestExtraArgs = "--no-default-features -- --test-threads=2"; # bdk_bitcoind_rpc test spams bitcoind
+          });
+          latestNoStdBdk = craneLib.cargoBuild (commonArgs // {
+            inherit cargoArtifacts;
+            cargoCheckExtraArgs = "-p bdk --no-default-features --features bitcoin/no-std,miniscript/no-std,bdk_chain/hashbrown";
+          });
+          latestNoStdChain = craneLib.cargoBuild (commonArgs // {
+            inherit cargoArtifacts;
+            cargoCheckExtraArgs = "-p bdk_chain --no-default-features --features bitcoin/no-std,miniscript/no-std,hashbrown";
+          });
+          latestNoStdEsplora = craneLib.cargoBuild (commonArgs // {
+            inherit cargoArtifacts;
+            cargoCheckExtraArgs = "-p bdk_esplora --no-default-features --features bitcoin/no-std,miniscript/no-std,bdk_chain/hashbrown";
+          });
+
+          # MSRV
+          MSRV = packages.MSRV;
+          MSRVAll = craneMSRVLib.cargoTest (commonArgs // MSRVArgs // {
+            cargoArtifacts = cargoArtifactsMSRV;
+            cargoTestExtraArgs = "--all-features -- --test-threads=2"; # bdk_bitcoind_rpc test spams bitcoind
+          });
+          MSRVNoDefault = craneMSRVLib.cargoTest (commonArgs // MSRVArgs // {
+            cargoArtifacts = cargoArtifactsMSRV;
+            cargoTestExtraArgs = "--no-default-features -- --test-threads=2"; # bdk_bitcoind_rpc test spams bitcoind
+          });
+          MSRVNoStdBdk = craneMSRVLib.cargoBuild (commonArgs // MSRVArgs // {
+            cargoArtifacts = cargoArtifactsMSRV;
+            cargoCheckExtraArgs = "-p bdk --no-default-features --features bitcoin/no-std,miniscript/no-std,bdk_chain/hashbrown";
+          });
+          MSRVNoStdChain = craneMSRVLib.cargoBuild (commonArgs // MSRVArgs // {
+            cargoArtifacts = cargoArtifactsMSRV;
+            cargoCheckExtraArgs = "-p bdk_chain --no-default-features --features bitcoin/no-std,miniscript/no-std,hashbrown";
+          });
+          MSRVNoStdEsplora = craneMSRVLib.cargoBuild (commonArgs // MSRVArgs // {
+            cargoArtifacts = cargoArtifactsMSRV;
+            cargoCheckExtraArgs = "-p bdk_esplora --no-default-features --features bitcoin/no-std,miniscript/no-std,bdk_chain/hashbrown";
+          });
+
+          # WASM
+          WASMBdk = craneWASMLib.buildPackage (commonArgs // WASMArgs // {
+            cargoArtifacts = cargoArtifactsWASM;
+          });
+          WASMEsplora = craneWASMLib.cargoBuild (commonArgs // WASMArgs // {
+            cargoArtifacts = cargoArtifactsWASM;
+            cargoExtraArgs = "--locked -p bdk_esplora --no-default-features --features bitcoin/no-std,miniscript/no-std,bdk_chain/hashbrown,async";
+          });
+
+          # Audit dependencies
+          audit = craneLib.cargoAudit (commonArgs // {
+            inherit advisory-db;
+          });
+
+          # Pre-commit checks
+          pre-commit-check = pre-commit-hooks.lib.${system}.run {
+            src = ./.;
+            hooks = {
+              nixpkgs-fmt.enable = true;
+              typos.enable = true;
+              commitizen.enable = true; # conventional commits
+              signedcommits = {
+                enable = true;
+                name = "signed-commits";
+                description = "Check whether the current commit message is signed";
+                stages = [ "push" ];
+                entry = "${signed-commits}/bin/signed-commits";
+                language = "system";
+                pass_filenames = false;
+              };
+            };
+          };
+        };
+
+        packages = {
+          # Building: does a cargo build
+          default = craneLib.cargoBuild (commonArgs // {
+            inherit cargoArtifacts;
+          });
+          MSRV = craneMSRVLib.cargoBuild (commonArgs // MSRVArgs // {
+            cargoArtifacts = cargoArtifactsMSRV;
+          });
+          WASM = craneWASMLib.cargoBuild (commonArgs // WASMArgs // {
+            cargoArtifacts = cargoArtifactsWASM;
+          });
+        };
+        legacyPackages = {
+          ci = {
+            pre-commit-check = checks.pre-commit-check;
+            clippy = checks.clippy;
+            fmt = checks.fmt;
+            audit = checks.audit;
+            latest = {
+              all = checks.latestAll;
+              noDefault = checks.latestNoDefault;
+              noStdBdk = checks.latestNoStdBdk;
+              noStdChain = checks.latestNoStdChain;
+              noStdEsplora = checks.latestNoStdEsplora;
+            };
+            MSRV = {
+              all = checks.MSRVAll;
+              noDefault = checks.MSRVNoDefault;
+              noStdBdk = checks.MSRVNoStdBdk;
+              noStdChain = checks.MSRVNoStdChain;
+              noStdEsplora = checks.MSRVNoStdEsplora;
+            };
+            WASM = {
+              bdk = checks.WASMBdk;
+              esplora = checks.WASMEsplora;
+            };
+            codeCoverage = craneLLVMLib.cargoLlvmCov (commonArgs // {
+              inherit cargoArtifacts;
+              cargoLlvmCovExtraArgs = "--ignore-filename-regex /nix/store --all-features --workspace --lcov --output-path $out -- --test-threads=2";
+            });
+          };
+        };
+
+        devShells = {
+          default = craneLib.devShell {
+            inherit cargoArtifacts;
+            # inherit check build inputs
+            checks = {
+              clippy = checks.clippy;
+              fmt = checks.fmt;
+              default = checks.latest;
+              all = checks.latestAll;
+              noDefault = checks.latestNoDefault;
+              noStdBdk = checks.latestNoStdBdk;
+              noStdChain = checks.latestNoStdChain;
+              noStdEsplora = checks.latestNoStdEsplora;
+            };
+            # dependencies
+            packages = buildInputs ++ [
+              pkgs.bashInteractive
+              pkgs.git
+              pkgs.ripgrep
+              rustTarget
+            ];
+            # pre-commit-checks
+            inherit (self.checks.${system}.pre-commit-check) shellHook;
+
+            # env vars
+            BITCOIND_EXEC = commonArgs.BITCOIND_EXEC;
+            ELECTRS_EXEC = commonArgs.ELECTRS_EXEC;
+          };
+          MSRV = craneMSRVLib.devShell {
+            cargoArtifacts = cargoArtifactsMSRV;
+            # inherit check build inputs
+            checks = {
+              clippy = checks.clippy;
+              fmt = checks.fmt;
+              audit = checks.audit;
+              default = checks.MSRV;
+              all = checks.MSRVAll;
+              noDefault = checks.MSRVNoDefault;
+              noStdBdk = checks.MSRVNoStdBdk;
+              noStdChain = checks.MSRVNoStdChain;
+              noStdEsplora = checks.MSRVNoStdEsplora;
+            };
+            # dependencies
+            packages = buildInputs ++ [
+              pkgs.bashInteractive
+              pkgs.git
+              pkgs.ripgrep
+              rustMSRVTarget
+            ];
+
+            # pre-commit-checks
+            inherit (self.checks.${system}.pre-commit-check) shellHook;
+
+            # env vars
+            BITCOIND_EXEC = commonArgs.BITCOIND_EXEC;
+            ELECTRS_EXEC = commonArgs.ELECTRS_EXEC;
+          };
+          WASM = craneWASMLib.devShell {
+            # inherit check build inputs
+            checks = {
+              inherit (checks) clippy fmt audit MSRV MSRVAll MSRVNoDefault MSRVNoStdBdk MSRVNoStdChain MSRVNoStdEsplora;
+            };
+            # dependencies
+            packages = buildInputs ++ WASMInputs ++ [
+              pkgs.bashInteractive
+              pkgs.git
+              pkgs.ripgrep
+              rustWASMTarget
+            ];
+
+            # pre-commit-checks
+            inherit (self.checks.${system}.pre-commit-check) shellHook;
+
+            # env vars
+            BITCOIND_EXEC = commonArgs.BITCOIND_EXEC;
+            ELECTRS_EXEC = commonArgs.ELECTRS_EXEC;
+            CARGO_BUILD_TARGET = WASMArgs.CARGO_BUILD_TARGET;
+            CC = WASMArgs.CC;
+            AR = WASMArgs.AR;
+            CC_wasm32_unknown_unknown = WASMArgs.CC_wasm32_unknown_unknown;
+            CFLAGS_wasm32_unknown_unknown = WASMArgs.CFLAGS_wasm32_unknown_unknown;
+            AR_wasm32_unknown_unknown = WASMArgs.AR_wasm32_unknown_unknown;
+          };
+          lcov = pkgs.mkShell {
+            buildInputs = [ pkgs.lcov ];
+          };
+          docsNightly = craneNightlyLib.devShell {
+            packages = buildInputs ++ [ rustNightlyTarget ];
+            RUSTDOCFLAGS = "--cfg docsrs -Dwarnings";
+            BITCOIND_EXEC = commonArgs.BITCOIND_EXEC;
+            ELECTRS_EXEC = commonArgs.ELECTRS_EXEC;
+          };
+        };
+      }
+    );
+}
+
+