From 46b67dca40990f40b176663b44545f7f2ac6be60 Mon Sep 17 00:00:00 2001
From: Jose Storopoli <jose@storopoli.io>
Date: Tue, 12 Mar 2024 07:34:16 -0300
Subject: [PATCH] ci: move to Nix

You can switch flawlessly from Rust stable, MSRV, and nightly using
either:

- `nix develop .`: Rust MRSV
- `nix develop .#msrv`: Rust MRSV
- `nix develop .#stable`: Rust latest stable
- `nix develop .#nightly`: Rust Nightly

Also you don't need to worry about installing binaries from `bitcoind`
or `electrs` crates,
since we fetch these from `nixpkgs` (with pinned versions) and add them
to your local environment.
Additionally, all the extra dependencies that you need for WASM are
handled as well.
Finally, no need to set ENV vars: they are also set all by default to
you.

If you are committing typos, or failing to adhere to our guidelines in
[CONTRIBUTING.md](CONTRIBUTING.md);
we won't let you commit or push.
This is handled by Nix's automated `pre-commit` hooks which gives
helpful error messages.

Please check the [Nix.md](Nix.md) file to learn more about Nix and what
we are aiming to do with the Nix integration into BDK.
---
 clippy.toml => .clippy.toml                 |    0
 .github/workflows/audit.yml                 |   13 +-
 .github/workflows/code_coverage.yml         |   37 +-
 .github/workflows/cont_integration.yml      |  192 +-
 .github/workflows/nightly_docs.yml          |   30 +-
 .github/workflows/update_flake_lock.yml     |   21 +
 .gitignore                                  |   10 +-
 .typos.toml                                 |   16 +
 CONTRIBUTING.md                             |   33 +-
 Cargo.lock                                  | 2745 +++++++++++++++++++
 Cargo.toml                                  |    8 +
 Nix.md                                      |  145 +
 README.md                                   |   18 +-
 ci/commits_verify_signature.sh              |   19 +
 crates/bitcoind_rpc/README.md               |    4 +
 crates/bitcoind_rpc/src/lib.rs              |    2 +-
 crates/chain/src/indexed_tx_graph.rs        |    2 +-
 crates/chain/src/local_chain.rs             |   10 +-
 crates/chain/src/tx_graph.rs                |    6 +-
 crates/chain/tests/test_local_chain.rs      |    2 +-
 crates/chain/tests/test_spk_txout_index.rs  |    2 +-
 crates/esplora/README.md                    |    5 +
 crates/testenv/Cargo.toml                   |    2 +-
 crates/testenv/src/lib.rs                   |    8 +-
 crates/wallet/src/wallet/mod.rs             |    6 +-
 example-crates/example_electrum/src/main.rs |    3 +-
 example-crates/example_esplora/src/main.rs  |    3 +-
 example-crates/wallet_rpc/src/main.rs       |    3 +-
 flake.lock                                  |  245 ++
 flake.nix                                   |  192 ++
 30 files changed, 3600 insertions(+), 182 deletions(-)
 rename clippy.toml => .clippy.toml (100%)
 create mode 100644 .github/workflows/update_flake_lock.yml
 create mode 100644 .typos.toml
 create mode 100644 Cargo.lock
 create mode 100644 Nix.md
 create mode 100755 ci/commits_verify_signature.sh
 create mode 100644 flake.lock
 create mode 100644 flake.nix

diff --git a/clippy.toml b/.clippy.toml
similarity index 100%
rename from clippy.toml
rename to .clippy.toml
diff --git a/.github/workflows/audit.yml b/.github/workflows/audit.yml
index 6143cca822..3feb0288b0 100644
--- a/.github/workflows/audit.yml
+++ b/.github/workflows/audit.yml
@@ -3,17 +3,16 @@ name: Audit
 on:
   push:
     paths:
-      - '**/Cargo.toml'
-      - '**/Cargo.lock'
+      - "**/Cargo.toml"
+      - "**/Cargo.lock"
   schedule:
-    - cron: '0 0 * * 0' # Once per week
+    - cron: "0 0 * * 0" # Once per week
 
 jobs:
-
   security_audit:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: actions-rs/audit-check@v1
         with:
-          token: ${{ secrets.GITHUB_TOKEN }}
\ No newline at end of file
+          token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/code_coverage.yml b/.github/workflows/code_coverage.yml
index 54020bb90d..2804981fbc 100644
--- a/.github/workflows/code_coverage.yml
+++ b/.github/workflows/code_coverage.yml
@@ -6,27 +6,18 @@ 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: checkout
+        uses: actions/checkout@v4
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@v11
+      - name: Nix Cache
+        uses: DeterminateSystems/magic-nix-cache-action@v6
       - name: Rust Cache
-        uses: Swatinem/rust-cache@v2.2.1
+        uses: Swatinem/rust-cache@v2
+      # Code Coverage
       - name: Install grcov
-        run: if [[ ! -e ~/.cargo/bin/grcov ]]; then cargo install grcov; fi
+        run: nix develop -L ".#coverage" --command cargo install grcov
         # TODO: re-enable the hwi tests
       - name: Build simulator image
         run: docker build -t hwi/ledger_emulator ./ci -f ci/Dockerfile.ledger
@@ -35,23 +26,23 @@ jobs:
       - name: Install Python
         uses: actions/setup-python@v4
         with:
-          python-version: '3.9'
+          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
+        run: nix develop ".#coverage" -L --command 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
+        run: nix develop ".#coverage" -L --command 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
+        run: nix develop ".#coverage" -L --command genhtml -o coverage-report.html --ignore-errors source ./coverage/lcov.info
       - name: Coveralls upload
         uses: coverallsapp/github-action@master
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
       - name: Upload artifact
-        uses: actions/upload-artifact@v2
+        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 f793f7ad6b..7cc8116a5f 100644
--- a/.github/workflows/cont_integration.yml
+++ b/.github/workflows/cont_integration.yml
@@ -3,130 +3,122 @@ on: [push, pull_request]
 name: CI
 
 jobs:
+  self-care:
+    name: Flake self-check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Check Nix flake inputs
+        uses: DeterminateSystems/flake-checker-action@v7
+        with:
+          fail-mode: true
+
+  pre-commit-checks:
+    name: "Pre-commit checks: cargo fmt, typos, pgp-signed and conventional commits"
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout
+        uses: actions/checkout@v4
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@v11
+      - name: Nix Cache
+        uses: DeterminateSystems/magic-nix-cache-action@v6
+      - name: Rust Cache
+        uses: Swatinem/rust-cache@v2
+      - name: Pre-commit checks
+        run: nix develop -L .#stable --command pre-commit run --all-files
+
+  clippy:
+    name: "Stable build, clippy and test"
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        features:
+          - --no-default-features
+          - --all-features
+    steps:
+      - name: checkout
+        uses: actions/checkout@v4
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@v11
+      - name: Nix Cache
+        uses: DeterminateSystems/magic-nix-cache-action@v6
+      - name: Rust Cache
+        uses: Swatinem/rust-cache@v2
+      - name: Build
+        run: nix develop -L .#stable --command cargo build ${{ matrix.features }}
+      - name: Clippy
+        run: nix develop -L .#stable --command cargo clippy ${{ matrix.features }} -- -D warnings
+      - name: Test
+        run: nix develop -L .#stable --command cargo test ${{ matrix.features }}
 
   build-test:
-    name: Build and test
+    name: "MSRV build and test"
     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
-        with:
-            toolchain: ${{ matrix.rust.version }}
-            override: true
-            profile: minimal
+        uses: actions/checkout@v4
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@v11
+      - name: Nix Cache
+        uses: DeterminateSystems/magic-nix-cache-action@v6
       - 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 zstd-sys --precise "2.0.8+zstd.1.5.5"
-          cargo update -p time --precise "0.3.20"
-          cargo update -p home --precise "0.5.5"
-          cargo update -p proptest --precise "1.2.0"
-          cargo update -p url --precise "2.5.0"
-          cargo update -p cc --precise "1.0.105"
-          cargo update -p tokio --precise "1.38.1"
+        uses: Swatinem/rust-cache@v2
       - name: Build
-        run: cargo build ${{ matrix.features }}
+        run: nix develop -L .#msrv --command cargo build ${{ matrix.features }}
       - name: Test
-        run: cargo test ${{ matrix.features }}
+        run: nix develop -L .#msrv --command cargo test ${{ matrix.features }}
 
   check-no-std:
     name: Check no_std
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - msrv
+          - stable
     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: checkout
+        uses: actions/checkout@v4
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@v11
+      - name: Nix Cache
+        uses: DeterminateSystems/magic-nix-cache-action@v6
       - name: Rust Cache
-        uses: Swatinem/rust-cache@v2.2.1
+        uses: Swatinem/rust-cache@v2
+      # TODO "--target thumbv6m-none-eabi" should work but currently does not
       - 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 miniscript/no-std,hashbrown
-      - name: Check bdk wallet
-        working-directory: ./crates/wallet
-        # TODO "--target thumbv6m-none-eabi" should work but currently does not
-        run: cargo check --no-default-features --features miniscript/no-std,bdk_chain/hashbrown
+        run: nix develop -L ".#${{ matrix.rust }}" --command cargo check -p bdk_chain --no-default-features --features miniscript/no-std,hashbrown
+      - name: Check bdk
+        run: nix develop -L ".#${{ matrix.rust }}" --command cargo check -p bdk_wallet --no-default-features --features 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 miniscript/no-std,bdk_chain/hashbrown
+        run: nix develop -L ".#${{ matrix.rust }}" --command cargo check -p bdk_esplora --no-default-features --features miniscript/no-std,bdk_chain/hashbrown
 
   check-wasm:
     name: Check WASM
-    runs-on: ubuntu-20.04
-    env:
-      CC: clang-10
-      CFLAGS: -I/usr/include
-    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 wallet
-        working-directory: ./crates/wallet
-        run: cargo check --target wasm32-unknown-unknown --no-default-features --features miniscript/no-std,bdk_chain/hashbrown
-      - name: Check esplora
-        working-directory: ./crates/esplora
-        run: cargo check --target wasm32-unknown-unknown --no-default-features --features miniscript/no-std,bdk_chain/hashbrown,async
-
-  fmt:
-    name: Rust fmt
-    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
-
-  clippy_check:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - msrv
+          - stable
+        target:
+          - wasm32-unknown-unknown
     steps:
-      - uses: actions/checkout@v1
-      - uses: actions-rs/toolchain@v1
-        with:
-            toolchain: 1.78.0
-            components: clippy
-            override: true
+      - name: checkout
+        uses: actions/checkout@v4
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@v11
+      - name: Nix Cache
+        uses: DeterminateSystems/magic-nix-cache-action@v6
       - name: Rust Cache
-        uses: Swatinem/rust-cache@v2.2.1
-      - uses: actions-rs/clippy-check@v1
-        with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          args: --all-features --all-targets -- -D warnings
+        uses: Swatinem/rust-cache@v2
+      - name: Check bdk
+        run: nix develop -L ".#${{ matrix.rust }}" --command cargo check -p bdk_wallet --target ${{ matrix.target }} --no-default-features --features miniscript/no-std,bdk_chain/hashbrown
+      - name: Check esplora
+        run: nix develop -L ".#${{ matrix.rust }}" --command cargo check -p bdk_esplora --target ${{ matrix.target }} --no-default-features --features miniscript/no-std,bdk_chain/hashbrown,async
diff --git a/.github/workflows/nightly_docs.yml b/.github/workflows/nightly_docs.yml
index 5fa4ecb5de..9740319818 100644
--- a/.github/workflows/nightly_docs.yml
+++ b/.github/workflows/nightly_docs.yml
@@ -7,34 +7,30 @@ jobs:
     name: Build docs
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout sources
-        uses: actions/checkout@v2
-      - name: Set default toolchain
-        run: rustup default nightly-2024-05-12
-      - name: Set profile
-        run: rustup set profile minimal
-      - name: Update toolchain
-        run: rustup update
+      - name: checkout
+        uses: actions/checkout@v4
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@v11
+      - name: Nix Cache
+        uses: DeterminateSystems/magic-nix-cache-action@v6
       - name: Rust Cache
-        uses: Swatinem/rust-cache@v2.2.1
+        uses: Swatinem/rust-cache@v2
       - name: Build docs
-        run: cargo doc --no-deps
-        env:
-          RUSTDOCFLAGS: '--cfg docsrs -Dwarnings'
+        run: nix develop -L '.#nightly' --command cargo doc --no-deps
       - name: Upload artifact
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           name: built-docs
           path: ./target/doc/*
 
   publish_docs:
-    name: 'Publish docs'
+    name: "Publish docs"
     if: github.ref == 'refs/heads/master'
     needs: [build_docs]
     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 +40,14 @@ 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..be41de5630
--- /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 1 * *" # runs monthly on day 1 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@v11
+      - name: Update flake.lock
+        uses: DeterminateSystems/update-flake-lock@v21
+        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 e2d4d770a8..4455165bc0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,10 +1,16 @@
+# Added by Cargo
 /target
-Cargo.lock
-/.vscode
 
+# Dev environment
+/.vscode
 *.swp
 .idea
 
 # Example persisted files.
 *.db
 *.sqlite*
+
+# Nix
+/result
+# pre-commit-hooks.nix
+.pre-commit-config.yaml
diff --git a/.typos.toml b/.typos.toml
new file mode 100644
index 0000000000..f0a2d17d45
--- /dev/null
+++ b/.typos.toml
@@ -0,0 +1,16 @@
+[default]
+extend-ignore-re = [
+  "flate2", # crate
+  "tprv.*", # xpriv key
+  "tpub.*", # xpriv key
+  "bc.*",   # address
+  "pk(.*)", # miniscript policy
+  # some descriptor tests
+  "muCPpS6Ue7nkzeJMWDViw7Lkwr92Yc4K8g",
+  "2MypGwr5eQWAWWJtiJgUEToVxc4zuokjQRe",
+  "2NDUoevN4QMzhvHDMGhKuiT2fN9HXbFRMwn",
+  "mzYvhRAuQqbdSKMVVzXNYyqihgNdRadAUQ",
+]
+
+[default.extend-words]
+fing = "fing" # short for fingerprint
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..ce3e219061
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,2745 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
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diff --git a/Cargo.toml b/Cargo.toml
index f9dbbf8853..2bd7af32b1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -23,3 +23,11 @@ members = [
 
 [workspace.package]
 authors = ["Bitcoin Dev Kit Developers"]
+
+[profile.dev]
+
+[profile.ci]
+inherits = "dev"
+debug = 1
+incremental = false
+lto = "off"
diff --git a/Nix.md b/Nix.md
new file mode 100644
index 0000000000..838acc7964
--- /dev/null
+++ b/Nix.md
@@ -0,0 +1,145 @@
+# 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/).
+- [Zero to Nix](https://zero-to-nix.com/)
+
+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).
+If just want the easy one-click installation from [Determinate Systems](https://github.com/DeterminateSystems/nix-installer),
+you can run:
+
+```shell
+curl --proto '=https' --tlsv1.2 -sSf -L https://install.determinate.systems/nix | sh -s -- install
+```
+
+## 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
+
+BDK's tests and checks are run using Nix.
+If you want to run the tests locally, you can do so with:
+
+```shell
+nix develop -L .
+pre-commit run --all-files
+```
+
+The `-L` flag prints full build logs on standard error.
+This is good for debugging.
+
+Under the hood `nix develop -L .` will instantiate a Nix shell with everything you need.
+No need to install Rust or any other dependencies like `bitcoind` or `esplora`;
+and WASM toolchains are also available.
+You don't even have to worry about environment variables,
+since they are all set for you.
+
+- Checks for typos in the source code and documentation.
+- Checks if all the commits are GPG-signed and follow the conventional commits style.
+  (again, please check [CONTRIBUTING.md](CONTRIBUTING.md))
+- Runs `cargo clippy` in all workspace.
+- Runs `cargo fmt` in all workspace.
+- Runs `nixpgs-fmt` in all workspace (for `.nix` files)
+
+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:
+
+```shell
+nix develop .#SHELL
+```
+
+Where `SHELL` is the name of the `devShell` you want to use.
+For all the shells we provide they come with the WASM Rust target toolchain.
+We provide the following shells:
+
+- default: latest Rust, you can omit the `#SHELL` and just run `nix develop .`.
+- `msrv`: MSRV Rust version.
+- `nightly`: Nightly Rust version.
+- `lcov`: used in CI to generate coverage reports.
+
+All of these `devShell`s handle all the necessary dependencies and environment variables needed.
+They also provide pre-commit git hooks covered [above](#bdks-nix-based-tests-and-ci).
+
+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 812c0a5c41..6c49824585 100644
--- a/README.md
+++ b/README.md
@@ -32,7 +32,7 @@ The `bdk` libraries aims to provide well engineered and reviewed components for
 It is built upon the excellent [`rust-bitcoin`] and [`rust-miniscript`] crates.
 
 > ⚠ The Bitcoin Dev Kit developers are in the process of releasing a `v1.0` which is a fundamental re-write of how the library works.
-> See for some background on this project: https://bitcoindevkit.org/blog/road-to-bdk-1/ (ignore the timeline 😁)
+> See for some background on this project: <https://bitcoindevkit.org/blog/road-to-bdk-1/> (ignore the timeline 😁)
 > For a release timeline see the [`BDK 1.0 project page`].
 
 ## Architecture
@@ -45,8 +45,11 @@ 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.
+- [`bitcoind_rpc`](./crates/bitcond_rpc) Emitting blockchain data from the `bitcoind` RPC interface.
+- [`testenv`](./crates/testenv): A testing environment for integration tests that spins up a regtest bitcoind and an electrs instance.
 
 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 `Wallet`.
 - [`example_electrum`](./example-crates/example_electrum): A command line Bitcoin wallet application built on top of `example_cli` and the `electrum` crate. It shows the power of the bdk tools (`chain` + `file_store` + `electrum`), without depending on the main `bdk_wallet` library.
 - [`example_esplora`](./example-crates/example_esplora): A command line Bitcoin wallet application built on top of `example_cli` and the `esplora` crate. It shows the power of the bdk tools (`chain` + `file_store` + `esplora`), without depending on the main `bdk_wallet` library.
@@ -62,14 +65,19 @@ 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.
 
 To build with the MSRV you will need to pin dependencies as follows:
 
 ```shell
-cargo update -p zstd-sys --precise "2.0.8+zstd.1.5.5"
-cargo update -p time --precise "0.3.20"
 cargo update -p home --precise "0.5.5"
 cargo update -p proptest --precise "1.2.0"
 cargo update -p url --precise "2.5.0"
@@ -81,8 +89,8 @@ cargo update -p tokio --precise "1.38.1"
 
 Licensed under either of
 
-* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or <https://www.apache.org/licenses/LICENSE-2.0>)
-* MIT license ([LICENSE-MIT](LICENSE-MIT) or <https://opensource.org/licenses/MIT>)
+- Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or <https://www.apache.org/licenses/LICENSE-2.0>)
+- MIT license ([LICENSE-MIT](LICENSE-MIT) or <https://opensource.org/licenses/MIT>)
 
 at your option.
 
diff --git a/ci/commits_verify_signature.sh b/ci/commits_verify_signature.sh
new file mode 100755
index 0000000000..6d1418754d
--- /dev/null
+++ b/ci/commits_verify_signature.sh
@@ -0,0 +1,19 @@
+#!/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
+        # Allow ssh sign, because the ci server does not set gpg.ssh.allowedSignersFile, so there will be an alert
+        if ! git verify-commit "$commit_hash" 2>&1 | grep 'gpg.ssh.allowedSignersFile needs to be configured'; then
+            echo "Error: Last commit ($commit_hash) is not signed."
+            exit 1
+        fi
+    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/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/src/lib.rs b/crates/bitcoind_rpc/src/lib.rs
index ce5e863bb0..6a903163ee 100644
--- a/crates/bitcoind_rpc/src/lib.rs
+++ b/crates/bitcoind_rpc/src/lib.rs
@@ -79,7 +79,7 @@ impl<'c, C: bitcoincore_rpc::RpcApi> Emitter<'c, C> {
             .last_mempool_tip
             // We use `start_height - 1` as we cannot guarantee that the block at
             // `start_height` has been emitted.
-            .unwrap_or(self.start_height.saturating_sub(1));
+            .unwrap_or_else(|| self.start_height.saturating_sub(1));
 
         // Mempool txs come with a timestamp of when the tx is introduced to the mempool. We keep
         // track of the latest mempool tx's timestamp to determine whether we have seen a tx
diff --git a/crates/chain/src/indexed_tx_graph.rs b/crates/chain/src/indexed_tx_graph.rs
index a8048d8456..30d66193ed 100644
--- a/crates/chain/src/indexed_tx_graph.rs
+++ b/crates/chain/src/indexed_tx_graph.rs
@@ -302,7 +302,7 @@ impl<A, I> AsRef<TxGraph<A>> for IndexedTxGraph<A, I> {
 }
 
 /// Represents changes to an [`IndexedTxGraph`].
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 #[cfg_attr(
     feature = "serde",
     derive(serde::Deserialize, serde::Serialize),
diff --git a/crates/chain/src/local_chain.rs b/crates/chain/src/local_chain.rs
index 9fcd7a7069..4b2ddc6727 100644
--- a/crates/chain/src/local_chain.rs
+++ b/crates/chain/src/local_chain.rs
@@ -177,7 +177,7 @@ impl CheckPoint {
     /// The effect of `insert` depends on whether a height already exists. If it doesn't the
     /// `block_id` we inserted and all pre-existing blocks higher than it will be re-inserted after
     /// it. If the height already existed and has a conflicting block hash then it will be purged
-    /// along with all block followin it. The returned chain will have a tip of the `block_id`
+    /// along with all block following it. The returned chain will have a tip of the `block_id`
     /// passed in. Of course, if the `block_id` was already present then this just returns `self`.
     #[must_use]
     pub fn insert(self, block_id: BlockId) -> Self {
@@ -682,7 +682,7 @@ impl FromIterator<(u32, BlockHash)> for ChangeSet {
 }
 
 /// An error which occurs when a [`LocalChain`] is constructed without a genesis checkpoint.
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct MissingGenesisError;
 
 impl core::fmt::Display for MissingGenesisError {
@@ -698,7 +698,7 @@ impl core::fmt::Display for MissingGenesisError {
 impl std::error::Error for MissingGenesisError {}
 
 /// Represents a failure when trying to insert/remove a checkpoint to/from [`LocalChain`].
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct AlterCheckPointError {
     /// The checkpoint's height.
     pub height: u32,
@@ -729,7 +729,7 @@ impl core::fmt::Display for AlterCheckPointError {
 impl std::error::Error for AlterCheckPointError {}
 
 /// Occurs when an update does not have a common checkpoint with the original chain.
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct CannotConnectError {
     /// The suggested checkpoint to include to connect the two chains.
     pub try_include_height: u32,
@@ -749,7 +749,7 @@ impl core::fmt::Display for CannotConnectError {
 impl std::error::Error for CannotConnectError {}
 
 /// The error type for [`LocalChain::apply_header_connected_to`].
-#[derive(Debug, Clone, PartialEq)]
+#[derive(Debug, Clone, PartialEq, Eq)]
 pub enum ApplyHeaderError {
     /// Occurs when `connected_to` block conflicts with either the current block or previous block.
     InconsistentBlocks,
diff --git a/crates/chain/src/tx_graph.rs b/crates/chain/src/tx_graph.rs
index 192b122e2f..b78a977930 100644
--- a/crates/chain/src/tx_graph.rs
+++ b/crates/chain/src/tx_graph.rs
@@ -106,7 +106,7 @@ use core::{
 /// See the [module-level documentation] for more.
 ///
 /// [module-level documentation]: crate::tx_graph
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct TxGraph<A = ()> {
     // all transactions that the graph is aware of in format: `(tx_node, tx_anchors)`
     txs: HashMap<Txid, (TxNodeInternal, BTreeSet<A>)>,
@@ -156,7 +156,7 @@ impl<'a, T, A> Deref for TxNode<'a, T, A> {
 ///
 /// This can either be a whole transaction, or a partial transaction (where we only have select
 /// outputs).
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 enum TxNodeInternal {
     Whole(Arc<Transaction>),
     Partial(BTreeMap<u32, TxOut>),
@@ -1224,7 +1224,7 @@ impl<A: Anchor> TxGraph<A> {
 /// Refer to [module-level documentation] for more.
 ///
 /// [module-level documentation]: crate::tx_graph
-#[derive(Debug, Clone, PartialEq)]
+#[derive(Debug, Clone, PartialEq, Eq)]
 #[cfg_attr(
     feature = "serde",
     derive(serde::Deserialize, serde::Serialize),
diff --git a/crates/chain/tests/test_local_chain.rs b/crates/chain/tests/test_local_chain.rs
index 6819e3da15..44c247bbb2 100644
--- a/crates/chain/tests/test_local_chain.rs
+++ b/crates/chain/tests/test_local_chain.rs
@@ -23,7 +23,7 @@ struct TestLocalChain<'a> {
     exp: ExpectedResult<'a>,
 }
 
-#[derive(Debug, PartialEq)]
+#[derive(Debug, PartialEq, Eq)]
 enum ExpectedResult<'a> {
     Ok {
         changeset: &'a [(u32, Option<BlockHash>)],
diff --git a/crates/chain/tests/test_spk_txout_index.rs b/crates/chain/tests/test_spk_txout_index.rs
index 3d3b82e89d..1ff59f7d67 100644
--- a/crates/chain/tests/test_spk_txout_index.rs
+++ b/crates/chain/tests/test_spk_txout_index.rs
@@ -120,5 +120,5 @@ fn unmark_used_does_not_result_in_invalid_representation() {
     assert!(!spk_index.unmark_used(&0));
     assert!(!spk_index.unmark_used(&1));
     assert!(!spk_index.unmark_used(&2));
-    assert!(spk_index.unused_spks(..).collect::<Vec<_>>().is_empty());
+    assert!(spk_index.unused_spks(..).next().is_none());
 }
diff --git a/crates/esplora/README.md b/crates/esplora/README.md
index 96d92c76c8..4c13dd00cf 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/testenv/Cargo.toml b/crates/testenv/Cargo.toml
index 2d9c26caab..28328c4076 100644
--- a/crates/testenv/Cargo.toml
+++ b/crates/testenv/Cargo.toml
@@ -14,7 +14,7 @@ readme = "README.md"
 
 [dependencies]
 bdk_chain = { path = "../chain", version = "0.17", default-features = false }
-electrsd = { version = "0.28.0", features = ["bitcoind_25_0", "esplora_a33e97e1", "legacy"] }
+electrsd = { version = "0.28.0", features = ["legacy"] }
 
 [features]
 default = ["std"]
diff --git a/crates/testenv/src/lib.rs b/crates/testenv/src/lib.rs
index b0c75b30ba..949369c05a 100644
--- a/crates/testenv/src/lib.rs
+++ b/crates/testenv/src/lib.rs
@@ -29,12 +29,12 @@ pub struct TestEnv {
 impl TestEnv {
     /// Construct a new [`TestEnv`] instance with default configurations.
     pub fn new() -> anyhow::Result<Self> {
-        let bitcoind = match std::env::var_os("BITCOIND_EXE") {
+        let bitcoind = match std::env::var_os("BITCOIND_EXEC") {
             Some(bitcoind_path) => electrsd::bitcoind::BitcoinD::new(bitcoind_path),
             None => {
                 let bitcoind_exe = electrsd::bitcoind::downloaded_exe_path()
                     .expect(
-                "you need to provide an env var BITCOIND_EXE or specify a bitcoind version feature",
+                "you need to provide an env var BITCOIND_EXEC or specify a bitcoind version feature",
                 );
                 electrsd::bitcoind::BitcoinD::with_conf(
                     bitcoind_exe,
@@ -45,7 +45,7 @@ impl TestEnv {
 
         let mut electrsd_conf = electrsd::Conf::default();
         electrsd_conf.http_enabled = true;
-        let electrsd = match std::env::var_os("ELECTRS_EXE") {
+        let electrsd = match std::env::var_os("ELECTRS_EXEC") {
             Some(env_electrs_exe) => {
                 electrsd::ElectrsD::with_conf(env_electrs_exe, &bitcoind, &electrsd_conf)
             }
@@ -73,7 +73,7 @@ impl TestEnv {
     pub fn reset_electrsd(mut self) -> anyhow::Result<Self> {
         let mut electrsd_conf = electrsd::Conf::default();
         electrsd_conf.http_enabled = true;
-        let electrsd = match std::env::var_os("ELECTRS_EXE") {
+        let electrsd = match std::env::var_os("ELECTRS_EXEC") {
             Some(env_electrs_exe) => {
                 electrsd::ElectrsD::with_conf(env_electrs_exe, &self.bitcoind, &electrsd_conf)
             }
diff --git a/crates/wallet/src/wallet/mod.rs b/crates/wallet/src/wallet/mod.rs
index df22c8a641..a71ed609b6 100644
--- a/crates/wallet/src/wallet/mod.rs
+++ b/crates/wallet/src/wallet/mod.rs
@@ -2119,7 +2119,11 @@ impl Wallet {
         Ok(psbt_input)
     }
 
-    fn update_psbt_with_descriptor(&self, psbt: &mut Psbt) -> Result<(), MiniscriptPsbtError> {
+    #[allow(clippy::needless_collect)]
+    fn update_psbt_with_descriptor(
+        &self,
+        psbt: &mut psbt::Psbt,
+    ) -> Result<(), MiniscriptPsbtError> {
         // We need to borrow `psbt` mutably within the loops, so we have to allocate a vec for all
         // the input utxos and outputs
         let utxos = (0..psbt.inputs.len())
diff --git a/example-crates/example_electrum/src/main.rs b/example-crates/example_electrum/src/main.rs
index 083a4fe463..b460a91b97 100644
--- a/example-crates/example_electrum/src/main.rs
+++ b/example-crates/example_electrum/src/main.rs
@@ -1,3 +1,4 @@
+#![allow(clippy::needless_collect)]
 use std::{
     io::{self, Write},
     sync::Mutex,
@@ -91,7 +92,7 @@ impl ElectrumArgs {
     }
 }
 
-#[derive(Parser, Debug, Clone, PartialEq)]
+#[derive(Parser, Debug, Clone, PartialEq, Eq)]
 pub struct ScanOptions {
     /// Set batch size for each script_history call to electrum client.
     #[clap(long, default_value = "25")]
diff --git a/example-crates/example_esplora/src/main.rs b/example-crates/example_esplora/src/main.rs
index af64226899..9cdc43676f 100644
--- a/example-crates/example_esplora/src/main.rs
+++ b/example-crates/example_esplora/src/main.rs
@@ -1,3 +1,4 @@
+#![allow(clippy::needless_collect)]
 use std::{
     collections::BTreeSet,
     io::{self, Write},
@@ -93,7 +94,7 @@ impl EsploraArgs {
     }
 }
 
-#[derive(Parser, Debug, Clone, PartialEq)]
+#[derive(Parser, Debug, Clone, PartialEq, Eq)]
 pub struct ScanOptions {
     /// Max number of concurrent esplora server requests.
     #[clap(long, default_value = "5")]
diff --git a/example-crates/wallet_rpc/src/main.rs b/example-crates/wallet_rpc/src/main.rs
index 2533de644c..2fd5c8f3b1 100644
--- a/example-crates/wallet_rpc/src/main.rs
+++ b/example-crates/wallet_rpc/src/main.rs
@@ -122,9 +122,8 @@ fn main() -> anyhow::Result<()> {
             .expect("failed to send sigterm")
     });
 
-    let emitter_tip = wallet_tip.clone();
     spawn(move || -> Result<(), anyhow::Error> {
-        let mut emitter = Emitter::new(&rpc_client, emitter_tip, args.start_height);
+        let mut emitter = Emitter::new(&rpc_client, wallet_tip, args.start_height);
         while let Some(emission) = emitter.next_block()? {
             sender.send(Emission::Block(emission))?;
         }
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000000..824f24fd00
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,245 @@
+{
+  "nodes": {
+    "crane": {
+      "inputs": {
+        "nixpkgs": [
+          "electrs",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1711586303,
+        "narHash": "sha256-iZDHWTqQj6z6ccqTSEOPOxQ8KMFAemInUObN2R9vHSs=",
+        "owner": "ipetkov",
+        "repo": "crane",
+        "rev": "a329cd00398379c62e76fc3b8d4ec2934260d636",
+        "type": "github"
+      },
+      "original": {
+        "owner": "ipetkov",
+        "repo": "crane",
+        "type": "github"
+      }
+    },
+    "electrs": {
+      "inputs": {
+        "crane": "crane",
+        "flake-utils": [
+          "flake-utils"
+        ],
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "rust-overlay": "rust-overlay"
+      },
+      "locked": {
+        "lastModified": 1717429618,
+        "narHash": "sha256-uKhhnA+xSzZoS/NgBd+xANW9V2c2n3aszto9V0igiv8=",
+        "owner": "Blockstream",
+        "repo": "electrs",
+        "rev": "e11cd561a197f8c0e4839721b4e1877b2a41053f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "Blockstream",
+        "repo": "electrs",
+        "type": "github"
+      }
+    },
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1696426674,
+        "narHash": "sha256-kvjfFW7WAETZlt09AgDn1MrtKzP7t90Vf7vypd3OL1U=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "0f9255e01c2351cc7d116c072cb317785dd33b33",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1710146030,
+        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "gitignore": {
+      "inputs": {
+        "nixpkgs": [
+          "pre-commit-hooks",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1709087332,
+        "narHash": "sha256-HG2cCnktfHsKV0s4XW83gU3F57gaTljL9KNSuG6bnQs=",
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "rev": "637db329424fd7e46cf4185293b9cc8c88c95394",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1722221733,
+        "narHash": "sha256-sga9SrrPb+pQJxG1ttJfMPheZvDOxApFfwXCFO0H9xw=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "12bf09802d77264e441f48e25459c10c93eada2e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-24.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-stable": {
+      "locked": {
+        "lastModified": 1720386169,
+        "narHash": "sha256-NGKVY4PjzwAa4upkGtAMz1npHGoRzWotlSnVlqI40mo=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "194846768975b7ad2c4988bdb82572c00222c0d7",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-24.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1719082008,
+        "narHash": "sha256-jHJSUH619zBQ6WdC21fFAlDxHErKVDJ5fpN0Hgx4sjs=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "9693852a2070b398ee123a329e68f0dab5526681",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "pre-commit-hooks": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "gitignore": "gitignore",
+        "nixpkgs": "nixpkgs_2",
+        "nixpkgs-stable": "nixpkgs-stable"
+      },
+      "locked": {
+        "lastModified": 1721042469,
+        "narHash": "sha256-6FPUl7HVtvRHCCBQne7Ylp4p+dpP3P/OYuzjztZ4s70=",
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "rev": "f451c19376071a90d8c58ab1a953c6e9840527fd",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "electrs": "electrs",
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs",
+        "pre-commit-hooks": "pre-commit-hooks",
+        "rust-overlay": "rust-overlay_2"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "flake-utils": [
+          "electrs",
+          "flake-utils"
+        ],
+        "nixpkgs": [
+          "electrs",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1711592024,
+        "narHash": "sha256-oD4OJ3TRmVrbAuKZWxElRCyCagNCDuhfw2exBmNOy48=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "aa858717377db2ed8ffd2d44147d907baee656e5",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    },
+    "rust-overlay_2": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1722305989,
+        "narHash": "sha256-ljiuTGSFuEtudqFqp/5Wr1OuEsVCjur/F2CmlNujSjc=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "38c2f156fca1868c8be7195ddac150522752f6ab",
+        "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"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000000..83fb681177
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,192 @@
+{
+  description = "BDK Flake to run all tests locally and in CI";
+
+  inputs = {
+    # stable nixpkgs (let's not YOLO on unstable)
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.05";
+
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs = {
+        nixpkgs.follows = "nixpkgs";
+        flake-utils.follows = "flake-utils";
+      };
+    };
+
+    flake-utils.url = "github:numtide/flake-utils";
+
+    pre-commit-hooks.url = "github:cachix/pre-commit-hooks.nix";
+
+    electrs = {
+      url = "github:Blockstream/electrs";
+      inputs = {
+        nixpkgs.follows = "nixpkgs";
+        flake-utils.follows = "flake-utils";
+      };
+    };
+  };
+
+  outputs = { self, nixpkgs, rust-overlay, flake-utils, pre-commit-hooks, electrs, ... }:
+    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
+        ];
+
+        # Dependencies
+        pkgs = import nixpkgs {
+          inherit system overlays;
+        };
+
+        pkgs-esplora = electrs.packages.${system}.default;
+
+        # Signed Commits
+        signed-commits = pkgs.writeShellApplication {
+          name = "signed-commits";
+          runtimeInputs = [ pkgs.git ];
+          text = builtins.readFile ./ci/commits_verify_signature.sh;
+        };
+
+        # Toolchains
+        # latest stable
+        stable = pkgs.rust-bin.stable.latest.default.override {
+          targets = [ "wasm32-unknown-unknown" ]; # wasm
+        };
+        # MSRV stable
+        msrv = pkgs.rust-bin.stable."1.63.0".default.override {
+          targets = [ "wasm32-unknown-unknown" ]; # wasm
+        };
+        # Nighly for docs
+        nightly = pkgs.rust-bin.selectLatestNightlyWith (toolchain: toolchain.default);
+        # Code coverage
+        coverage = pkgs.rust-bin.stable.latest.default.override {
+          targets = [ "wasm32-unknown-unknown" ]; # wasm
+          extensions = [ "llvm-tools-preview" ];
+        };
+
+        # Common inputs
+        envVars = {
+          BITCOIND_EXEC = "${pkgs.bitcoind}/bin/bitcoind";
+          ELECTRS_EXEC = "${pkgs-esplora}/bin/electrs";
+          CC = "${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";
+        };
+        buildInputs = [
+          # Add additional build inputs here
+          pkgs.bitcoind
+          pkgs-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
+        ];
+      in
+      {
+        checks = {
+          # Pre-commit checks
+          pre-commit-check =
+            let
+              # this is a hack based on https://github.com/cachix/pre-commit-hooks.nix/issues/126
+              # we want to use our own rust stuff from oxalica's overlay
+              _rust = pkgs.rust-bin.stable.latest.default;
+              rust = pkgs.buildEnv {
+                name = _rust.name;
+                inherit (_rust) meta;
+                buildInputs = [ pkgs.makeWrapper ];
+                paths = [ _rust ];
+                pathsToLink = [ "/" "/bin" ];
+                postBuild = ''
+                  for i in $out/bin/*; do
+                    wrapProgram "$i" --prefix PATH : "$out/bin"
+                  done
+                '';
+              };
+            in
+            pre-commit-hooks.lib.${system}.run {
+              src = ./.;
+              hooks = {
+                rustfmt = {
+                  enable = true;
+                  entry = lib.mkForce "${rust}/bin/cargo-fmt fmt --all -- --config format_code_in_doc_comments=true --check --color always";
+                };
+                nixpkgs-fmt.enable = true;
+                typos.enable = true;
+                commitizen.enable = true; # conventional commits
+                signedcommits = {
+                  enable = true;
+                  name = "signed-commits";
+                  description = "Check whether the current commit message is signed";
+                  stages = [ "push" ];
+                  entry = "${signed-commits}/bin/signed-commits";
+                  language = "system";
+                  pass_filenames = false;
+                };
+              };
+            };
+        };
+
+        devShells =
+          let
+            # pre-commit-checks
+            _shellHook = (self.checks.${system}.pre-commit-check.shellHook or "");
+          in
+          {
+            default = msrv;
+
+            msrv = pkgs.mkShell ({
+              shellHook = "${_shellHook}";
+              buildInputs = buildInputs ++ WASMInputs ++ [ msrv ];
+              inherit nativeBuildInputs;
+            } // envVars);
+
+            stable = pkgs.mkShell ({
+              shellHook = "${_shellHook}";
+              buildInputs = buildInputs ++ WASMInputs ++ [ stable ];
+              inherit nativeBuildInputs;
+            } // envVars);
+
+            nightly = pkgs.mkShell ({
+              shellHook = "${_shellHook}";
+              buildInputs = buildInputs ++ [ nightly ];
+              inherit nativeBuildInputs;
+            } // envVars);
+
+            coverage = pkgs.mkShell ({
+              shellHook = "${_shellHook}";
+              buildInputs = buildInputs ++ [ coverage pkgs.lcov ];
+              inherit nativeBuildInputs;
+              RUSTFLAGS = "-Cinstrument-coverage";
+              RUSTDOCFLAGS = "-Cinstrument-coverage";
+              LLVM_PROFILE_FILE = "./target/coverage/%p-%m.profraw";
+            } // envVars);
+          };
+      }
+    );
+}