diff --git a/contrib/CMakeLists.txt b/contrib/CMakeLists.txt
index 707104f01e..7a8d384b57 100644
--- a/contrib/CMakeLists.txt
+++ b/contrib/CMakeLists.txt
@@ -1,23 +1,24 @@
+add_subdirectory(arcanist)
 add_subdirectory(devtools)
 
 include(PackageHelper)
 exclude_from_source_package(
 	# Subdirectories
 	"debian/"
 	"gitian/"
 	"gitian-descriptors/"
 	"gitian-signing/"
 	"qos/"
 	"seeds/"
 	"teamcity/"
 	"testgen/"
 	# FIXME Can be packaged once it gets updated to work with Bitcoin ABC
 	"verifybinaries/"
 	"zmq/"
 
 	# Files
 	"bitcoin-qt.pro"
 	"gitian-build.py"
 	"README.md"
 	"valgrind.supp"
 )
diff --git a/contrib/arcanist/CMakeLists.txt b/contrib/arcanist/CMakeLists.txt
new file mode 100644
index 0000000000..0f118a34c9
--- /dev/null
+++ b/contrib/arcanist/CMakeLists.txt
@@ -0,0 +1,23 @@
+# Copyright (c) 2019 The Bitcoin developers
+
+add_custom_target(check-arcanist)
+
+find_program(BASH_EXECUTABLE bash)
+
+set(ARCANIST_TESTS
+  ./test/test-autopatch.sh
+)
+
+foreach(TEST ${ARCANIST_TESTS})
+  get_filename_component(FILENAME ${TEST} NAME)
+  set(TESTNAME "check-arcanist-${FILENAME}")
+  add_custom_target(${TESTNAME}
+    COMMAND
+      "${BASH_EXECUTABLE}"
+      "${CMAKE_CURRENT_SOURCE_DIR}/${TEST}"
+    )
+  add_dependencies(check-arcanist ${TESTNAME})
+endforeach()
+
+add_dependencies(check check-arcanist)
+add_dependencies(check-all check-arcanist)
diff --git a/contrib/arcanist/autopatch.sh b/contrib/arcanist/autopatch.sh
new file mode 100755
index 0000000000..579b9ff31f
--- /dev/null
+++ b/contrib/arcanist/autopatch.sh
@@ -0,0 +1,102 @@
+#!/usr/bin/env bash
+# Copyright (c) 2019 The Bitcoin developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+export LC_ALL=C.UTF-8
+
+set -euxo pipefail
+
+DEFAULT_PATCH_ARGS="--skip-dependencies"
+DEFAULT_REMOTE="origin"
+DEFAULT_BRANCH="master"
+
+help_message() {
+  set +x
+  echo "Apply a patch from Phabricator cleanly on latest master."
+  echo ""
+  echo "Options:"
+  echo "-b, --branch              The git branch to fetch and rebase onto. Default: '${DEFAULT_BRANCH}'"
+  echo "-h, --help                Display this help message."
+  echo "-o, --remote              The git remote to fetch latest from. Default: '${DEFAULT_REMOTE}'"
+  echo "-p, --patch-args          Args to pass to 'arc patch'. Default: '${DEFAULT_PATCH_ARGS}'"
+  echo "-r, --revision            The Differential revision ID used in Phabricator that you want to land. (ex: D1234)"
+  echo "                            This argument is required if --patch-args does not specify a revision or diff ID."
+  set -x
+}
+
+BRANCH="${DEFAULT_BRANCH}"
+PATCH_ARGS="${DEFAULT_PATCH_ARGS}"
+REMOTE="${DEFAULT_REMOTE}"
+REVISION=""
+
+# Parse command line arguments
+while [[ $# -gt 0 ]]; do
+case $1 in
+  -b|--branch)
+    BRANCH="$2"
+    shift # shift past argument
+    shift # shift past value
+    ;;
+  -h|--help)
+    help_message
+    exit 0
+    shift # shift past argument
+    ;;
+  -o|--remote)
+    REMOTE="$2"
+    shift # shift past argument
+    shift # shift past value
+    ;;
+  -p|--patch-args)
+    PATCH_ARGS="$2"
+    shift # shift past argument
+    shift # shift past value
+    ;;
+  -r|--revision)
+    REVISION="$2"
+    shift # shift past argument
+    shift # shift past value
+    ;;
+  *)
+    echo "Unknown argument: $1"
+    help_message
+    exit 1
+    shift # shift past argument
+    ;;
+esac
+done
+
+PATCH_ARGS="${REVISION} ${PATCH_ARGS}"
+
+# Make sure there are no unstaged changes, just in case this script is being run locally
+if [ -n "$(git status --porcelain)" ]; then
+  echo "Error: The source tree has unexpected changes. Clean up any changes (try 'git stash') and try again."
+  exit 10
+fi
+
+# Fetch and checkout latest changes, bailing if the branch isn't an ancestor of the remote branch.
+REMOTE_AND_BRANCH="${REMOTE}/${BRANCH}"
+git fetch "${REMOTE}" "${BRANCH}:${REMOTE_AND_BRANCH}"
+git checkout "${BRANCH}"
+git merge-base --is-ancestor "${BRANCH}" "${REMOTE_AND_BRANCH}" || {
+  echo "Error: Branch '${BRANCH}' is not an ancestor of '${REMOTE_AND_BRANCH}'"
+  exit 11
+}
+git pull "${REMOTE}" "${BRANCH}"
+
+(
+  # If arc fails, there may be a dangling branch. Clean it up before exiting.
+  cleanup() {
+    CURRENT_BRANCH=$(git rev-parse --abbrev-ref HEAD)
+    git checkout "${BRANCH}"
+    git branch -D "${CURRENT_BRANCH}" || true
+  }
+  trap "cleanup" ERR
+
+  # Note: `: | arc ...` pipes an empty string to stdin incase arcanist prompts
+  # for user input. This fails and is treated as an error.
+  : | arc patch ${PATCH_ARGS}
+)
+
+git rebase "${BRANCH}"
diff --git a/contrib/arcanist/test/test-autopatch.sh b/contrib/arcanist/test/test-autopatch.sh
new file mode 100755
index 0000000000..91c6f2c331
--- /dev/null
+++ b/contrib/arcanist/test/test-autopatch.sh
@@ -0,0 +1,132 @@
+#!/usr/bin/env bash
+# Copyright (c) 2019 The Bitcoin developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+export LC_ALL=C.UTF-8
+
+set -euxo pipefail
+
+TOPLEVEL=$(git rev-parse --show-toplevel)
+CURRENT_DIR=$(dirname $(readlink -f "$0"))
+TEST_PATCH="${CURRENT_DIR}/test-commit.patch"
+: "${REMOTE:=origin}"
+: "${MASTER_BRANCH:=master}"
+REMOTE_AND_BRANCH="${REMOTE}/${MASTER_BRANCH}"
+LATEST_MASTER=$(git rev-parse "${REMOTE_AND_BRANCH}")
+
+test_autopatch() {
+  PATCH_FILE="$1"
+  EXPECTED_EXIT_CODE="$2"
+  PATCH_ARGS="--patch ${PATCH_FILE}"
+  # Setting the remote to this repo allows us to simulate an upstream without
+  # relying on external services for unit tests.
+  export EDITOR="${CURRENT_DIR}/test-commit-message.sh"
+  # Note: Do not use `-o ${REMOTE}` here because REMOTE may be on the local filesystem.
+  EXIT_CODE=0
+  "${CURRENT_DIR}/../autopatch.sh" -o testorigin -b "${MASTER_BRANCH}" --patch-args "${PATCH_ARGS}" || EXIT_CODE=$?
+  if [ "${EXIT_CODE}" -ne "${EXPECTED_EXIT_CODE}" ]; then
+    echo "Error: autopatch exited with '${EXIT_CODE}' when '${EXPECTED_EXIT_CODE}' was expected."
+    exit 1
+  fi
+
+  # Autopatch failed as expected, so sanity checks are not necessary
+  if [ "${EXPECTED_EXIT_CODE}" -ne 0 ]; then
+    exit 0
+  fi
+
+  # Sanity checks
+  if [ -n "$(git status --porcelain)" ]; then
+    echo "Error: There should be no uncommitted changes."
+    exit 10
+  fi
+
+  if [ "${LATEST_MASTER}" != "$(git rev-parse HEAD~)" ]; then
+    echo "Error: Failed to patch on latest master."
+    exit 11
+  fi
+
+  # Note: Remove 'index ...' line from 'git diff' as the SHA1 hash is unlikely
+  # to match.
+  DIFF_HEAD_AGAINST_PATCH="$(git diff HEAD~ | grep -v "^index " | diff - "${PATCH_FILE}" || :)"
+  if [ -n "${DIFF_HEAD_AGAINST_PATCH}" ]; then
+    echo "Error: Rebased changes do not match the given patch. Difference was:"
+    echo "${DIFF_HEAD_AGAINST_PATCH}"
+    exit 12
+  fi
+}
+
+TEST_STATUS="FAILED"
+final_cleanup() {
+  # Cleanup the temporary test directory
+  rm -rf "$1"
+
+  # Nicely print the final test status
+  set +x
+  echo
+  echo "${0}:"
+  echo "${TEST_STATUS}"
+}
+
+TEMP_DIR=$(mktemp -d)
+trap 'final_cleanup ${TEMP_DIR}' RETURN EXIT
+cd "${TEMP_DIR}"
+git init
+git remote add testorigin "${TOPLEVEL}"
+git pull testorigin "${REMOTE_AND_BRANCH}"
+
+test_cleanup() {
+  # Cleanup current branch so that arcanist doesn't run out of branch names
+  CURRENT_BRANCH=$(git rev-parse --abbrev-ref HEAD)
+  git checkout "${MASTER_BRANCH}"
+  git reset --hard HEAD
+  git branch -D "${CURRENT_BRANCH}" || true
+}
+
+(
+  trap 'test_cleanup' RETURN ERR EXIT
+  echo "TEST: Simply sanity check that autopatch fast-forwards as expected"
+  git reset --hard HEAD~10
+  test_autopatch "${TEST_PATCH}" 0
+)
+
+test_file_not_present() {
+  if [ -n "$1" ] && [ -f "$1" ]; then
+    echo "Error: '$1' file was found but not expected!"
+    exit 51
+  fi
+}
+
+(
+  trap 'test_cleanup' RETURN ERR EXIT
+  echo "TEST: Locally committed changes cause the script to bail"
+  TEST_FILE="test-committed-changes"
+  touch "${TEST_FILE}"
+  git add "${TEST_FILE}"
+  git commit -m "test local commit"
+
+  test_autopatch "${TEST_PATCH}" 11
+)
+
+(
+  trap 'test_cleanup' RETURN ERR EXIT
+  echo "TEST: Staged changes are not included after autopatching"
+  TEST_FILE="test-staged-changes"
+  touch "${TEST_FILE}"
+  git add "${TEST_FILE}"
+
+  test_autopatch "${TEST_PATCH}" 10
+  test_file_not_present "${TEST_FILE}"
+)
+
+(
+  trap 'test_cleanup' RETURN ERR EXIT
+  echo "TEST: Unstaged changes are not included after autopatching"
+  TEST_FILE="test-unstaged-changes"
+  touch "${TEST_FILE}"
+
+  test_autopatch "${TEST_PATCH}" 10
+  test_file_not_present "${TEST_FILE}"
+)
+
+TEST_STATUS="PASSED"
diff --git a/contrib/arcanist/test/test-commit-message.sh b/contrib/arcanist/test/test-commit-message.sh
new file mode 100755
index 0000000000..df59bd5910
--- /dev/null
+++ b/contrib/arcanist/test/test-commit-message.sh
@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+# Copyright (c) 2019 The Bitcoin developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+export LC_ALL=C.UTF-8
+set -euxo pipefail
+echo "This commit message is used for testing." > "$1"
diff --git a/contrib/arcanist/test/test-commit.patch b/contrib/arcanist/test/test-commit.patch
new file mode 100644
index 0000000000..1457f74921
--- /dev/null
+++ b/contrib/arcanist/test/test-commit.patch
@@ -0,0 +1,2 @@
+diff --git a/test-file b/test-file
+new file mode 100644