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+# This Dockerfile builds Bitcoin Knots and packages it into a minimal `final` image
+
+# VERSION of Bitcoin Knots to be build
+#   NOTE: Unlike our other images this one is NOT prefixed with `v`,
+#           as many things (like download URLs) use this form instead.
+ARG VERSION=26.1.knots20240325
+
+# CPU architecture to build binaries for
+ARG ARCH
+
+# Define default versions so that they don't have to be repeated throughout the file
+ARG VER_ALPINE=3.18
+
+# $USER name, and data $DIR to be used in the `final` image
+ARG USER=bitcoind
+ARG DIR=/data
+
+# Choose where to get bitcoind sources from, options: release, git
+#   NOTE: Only `SOURCE=git` can be used for RC releases
+ARG SOURCE=release
+
+# Choose where to get BerkeleyDB from, options: prebuilt, compile
+#   NOTE: When compiled here total execution time exceeds allowed CI limits, so pre-built one is used by default
+ARG BDB_SOURCE=prebuilt
+
+
+
+#
+## `preparer-base` installs dependencies needed by both ways of fetching the source,
+#       as well as imports GPG keys needed to verify authenticity of the source.
+#
+FROM alpine:${VER_ALPINE} AS preparer-base
+
+RUN apk add --no-cache gnupg
+
+# Guix Builder Keys: https://github.com/bitcoin-core/guix.sigs/tree/main/builder-keys
+# curl -s "https://api.github.com/repos/bitcoin-core/guix.sigs/contents/builder-keys" | jq -r '.[].download_url'
+ENV KEYS 1A3E761F19D2CC7785C5502EA291A2C45D0C504A CACC7CBB26B3D2EE8FC2F2BC0E37EBAB8574F005 71A3B16735405025D447E8F274810B012346C9A6 \
+         9EDAFF80E080659604F4A76B2EBB056FD847F8A7
+
+RUN gpg --keyserver keyserver.ubuntu.com --recv-keys $KEYS
+
+#
+## Option #1: [default] Fetch bitcoind source from release tarballs
+#
+FROM preparer-base AS preparer-release
+
+ARG VERSION
+
+# Download sigs
+ADD https://bitcoinknots.org/files/26.x/$VERSION/SHA256SUMS.asc ./
+# Download checksums
+ADD https://bitcoinknots.org/files/26.x/$VERSION/SHA256SUMS ./
+
+# Download source code
+ADD https://bitcoinknots.org/files/26.x/$VERSION/bitcoin-26.1.knots20240325.tar.gz ./bitcoin-$VERSION.tar.gz
+
+# Verify that hashes are signed with the previously imported key
+RUN gpg --verify SHA256SUMS.asc SHA256SUMS
+
+# Extract
+RUN tar -xzf "bitcoin-$VERSION.tar.gz" && \
+    rm -f "bitcoin-$VERSION.tar.gz"
+
+#
+## Option #2: Fetch bitcoind source from GitHub
+#
+FROM preparer-base AS preparer-git
+
+ARG VERSION
+
+RUN apk add --no-cache git
+
+# Fetch the source code at a specific TAG
+RUN git clone  -b "v$VERSION"  --depth=1  https://github.com/bitcoinknots/bitcoin.git  "/bitcoin-$VERSION/"
+
+# Verify tag, and copy source code to predetermined location on success
+RUN cd "/bitcoin-$VERSION/" && \
+    git verify-tag "v$VERSION"
+
+
+
+#
+## Alias to go around `COPY` not accepting ARGs in value passed to `--from=`
+#
+FROM preparer-${SOURCE} AS preparer
+
+
+
+#
+## `berkeleydb-prebuilt` downloads a pre-built BerkeleyDB to make sure
+#       the overall build time of this Dockerfile fits within CI limits.
+#
+FROM lncm/berkeleydb:v4.8.30.NC${ARCH:+-${ARCH}} AS berkeleydb-prebuilt
+
+#
+## `berkeleydb-compile` builds BerkeleyDB from source using script provided in bitcoind repo.
+#
+FROM alpine:${VER_ALPINE} AS berkeleydb-compile
+# TODO: implement ^^
+RUN echo "Not implemented" && exit 1
+
+
+FROM berkeleydb-${BDB_SOURCE} AS berkeleydb
+
+
+
+#
+## `builder` builds Bitcoin Knots regardless on how the source, and BDB code were obtained.
+#
+# NOTE: this stage is emulated using QEMU
+# NOTE: `${ARCH:+${ARCH}/}` - if ARCH is set, append `/` to it, leave it empty otherwise
+FROM ${ARCH:+${ARCH}/}alpine:${VER_ALPINE} AS builder
+
+ARG VERSION
+ARG SOURCE
+
+RUN apk add --no-cache \
+        autoconf \
+        automake \
+        boost-dev \
+        sqlite-dev \
+        build-base \
+        chrpath \
+        file \
+        libevent-dev \
+        libressl \
+        libtool \
+        linux-headers \
+        zeromq-dev
+
+# Fetch pre-built berkeleydb
+COPY  --from=berkeleydb /opt/  /opt/
+
+# Change to the extracted directory
+WORKDIR /bitcoin-$VERSION/
+
+# Copy bitcoin source (downloaded & verified in previous stages)
+COPY  --from=preparer /bitcoin-$VERSION/  ./
+
+ENV BITCOIN_PREFIX /opt/bitcoin-$VERSION
+
+RUN ./autogen.sh
+
+# TODO: Try to optimize on passed params
+RUN ./configure LDFLAGS=-L/opt/db4/lib/ CPPFLAGS=-I/opt/db4/include/ \
+    CXXFLAGS="-O2" \
+    --prefix="$BITCOIN_PREFIX" \
+    --disable-man \
+    --disable-shared \
+    --disable-ccache \
+    --disable-tests \
+    --enable-static \
+    --enable-reduce-exports \
+    --without-gui \
+    --without-libs \
+    --with-utils \
+    --with-sqlite=yes \
+    --with-daemon
+
+RUN make -j$(( $(nproc) + 1 ))
+RUN make install
+
+# List installed binaries pre-strip & strip them
+RUN ls -lh "$BITCOIN_PREFIX/bin/"
+RUN strip -v "$BITCOIN_PREFIX/bin/bitcoin"*
+
+# List installed binaries post-strip & print their checksums
+RUN ls -lh "$BITCOIN_PREFIX/bin/"
+RUN sha256sum "$BITCOIN_PREFIX/bin/bitcoin"*
+
+
+
+#
+## `final` aggregates build results from previous stages into a necessary minimum
+#       ready to be used, and published to Docker Hub.
+#
+# NOTE: this stage is emulated using QEMU
+# NOTE: `${ARCH:+${ARCH}/}` - if ARCH is set, append `/` to it, leave it empty otherwise
+FROM ${ARCH:+${ARCH}/}alpine:${VER_ALPINE} AS final
+
+ARG VERSION
+ARG USER
+ARG DIR
+
+LABEL org.opencontainers.image.source=https://github.com/bitcoinknots/bitcoin
+LABEL org.opencontainers.image.description="Knots v25.1 for umbrel"
+LABEL org.opencontainers.image.licenses=MIT
+
+RUN apk add --no-cache \
+        libevent \
+        libsodium \
+        libstdc++ \
+        libzmq \
+        sqlite-libs
+
+COPY  --from=builder /opt/bitcoin-$VERSION/bin/bitcoin*  /usr/local/bin/
+
+# NOTE: Default GID == UID == 1000
+RUN adduser --disabled-password \
+            --home "$DIR/" \
+            --gecos "" \
+            "$USER"
+
+USER $USER
+
+# Prevents `VOLUME $DIR/.bitcoind/` being created as owned by `root`
+RUN mkdir -p "$DIR/.bitcoin/"
+
+# Expose volume containing all `bitcoind` data
+VOLUME $DIR/.bitcoin/
+
+# REST interface
+EXPOSE 8080
+
+# P2P network (mainnet, testnet & regnet respectively)
+EXPOSE 8333 18333 18444
+
+# RPC interface (mainnet, testnet & regnet respectively)
+EXPOSE 8332 18332 18443
+
+# ZMQ ports (for transactions & blocks respectively)
+EXPOSE 28332 28333
+
+ENTRYPOINT ["bitcoind"]
+
+CMD ["-zmqpubrawblock=tcp://0.0.0.0:28332", "-zmqpubrawtx=tcp://0.0.0.0:28333"]