diff --git a/gnu/packages/finance.scm b/gnu/packages/finance.scm
index a1e2216ae0..63de983472 100644
--- a/gnu/packages/finance.scm
+++ b/gnu/packages/finance.scm
@@ -34,6 +34,7 @@
 ;;; Copyright © 2022 Justin Veilleux <terramorpha@cock.li>
 ;;; Copyright © 2023 Frank Pursel <frank.pursel@gmail.com>
 ;;; Copyright © 2023 Skylar Hill <stellarskylark@posteo.net>
+;;; Copyright © 2023 Foundation Devices, Inc. <hello@foundationdevices.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -76,6 +77,7 @@ (define-module (gnu packages finance)
   #:use-module (gnu packages boost)
   #:use-module (gnu packages check)
   #:use-module (gnu packages compression)
+  #:use-module (gnu packages cpp)
   #:use-module (gnu packages crypto)
   #:use-module (gnu packages curl)
   #:use-module (gnu packages databases)
@@ -1795,36 +1797,70 @@ (define-public bitcoin-unlimited
 (define-public fulcrum
   (package
     (name "fulcrum")
-    (version "1.1.1")
-    (source
-     (origin
-       (method url-fetch)
-       (uri (string-append "https://gitlab.com/FloweeTheHub/fulcrum/-/archive/v"
-                           version "/fulcrum-v" version ".tar.gz"))
-       (sha256
-        (base32 "04w5gw02d39caa8a0l6wkn87kc43zzad2prqsyrcq97vlbkdx6x6"))))
+    (version "1.9.1")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://github.com/cculianu/Fulcrum")
+                    (commit (string-append "v" version))))
+              (file-name (git-file-name name version))
+              (modules '((guix build utils)))
+              (snippet
+                #~(for-each delete-file-recursively
+                            '("src/Json/simdjson"
+                              "src/bitcoin/secp256k1"
+                              "src/robin_hood"
+                              "src/zmq"
+                              "staticlibs")))
+              (sha256
+               (base32
+                "1110vanl6aczlq25i4ck9j4vr81in5icw4z383wyhjpcy6rwxsw2"))
+              (patches
+               (search-patches "fulcrum-1.9.1-unbundled-libraries.patch"))))
     (build-system gnu-build-system)
     (arguments
-     `(#:phases
-       (modify-phases %standard-phases
-         ;; Call qmake instead of configure to create a Makefile.
-         (replace 'configure
-           (lambda _
-             (invoke
-              "qmake"
-              (string-append "PREFIX=" %output)
-              "features="))))))
-    (native-inputs
-     (list qttools-5))
+     (list #:configure-flags
+           #~(list "CONFIG+=config_without_bundled_cppzmq"
+                   "CONFIG+=config_without_bundled_robin_hood"
+                   "CONFIG+=config_without_bundled_secp256k1"
+                   "LIBS+=-lrocksdb"
+                   #$@(if (target-64bit?) '("LIBS+=-lsimdjson") '())
+                   (format #f "DEFINES+=GIT_COMMIT=\"\\\\\\~s\\\\\\\""
+                           #$version)
+                   (string-append "PREFIX=" #$output))
+           #:phases
+           #~(modify-phases %standard-phases
+               (replace 'configure
+                 (lambda* (#:key configure-flags #:allow-other-keys)
+                   (apply invoke "qmake" configure-flags))))))
+    (native-inputs (list pkg-config qttools-5))
     (inputs
-     (list python qtbase-5 rocksdb zlib))
-    (home-page "https://gitlab.com/FloweeTheHub/fulcrum/")
-    (synopsis "Fast and nimble SPV server for Bitcoin Cash")
+     (append (list cppzmq
+                   jemalloc
+                   python
+                   qtbase-5
+                   robin-hood-hashing
+                   rocksdb
+                   zeromq
+                   zlib)
+             (if (target-64bit?)
+                 (list simdjson-0.6)
+                 '())))
+    (home-page "https://github.com/cculianu/Fulcrum")
+    (synopsis "Payment verification server for Bitcoin-like crypto-currencies")
     (description
-     "Flowee Fulcrum is a server that is the back-end for @acronym{SPV,
-Simplified Payment Verification} wallets, it provides the full API for those
-walets in a fast and small server.  The full data is stored in a full node,
-like Flowee the Hub, which Fulcrum connects to over RPC.")
+     "Fulcrum is a @acronym{SPV, Simplified Payment Verification} server for
+Bitcoin-like crypto-currencies.  The server indexes the blockchain of the
+crypto-currency used, and the resulting index can be used by wallets to
+perform queries to keep real-time track of balances.
+
+Supported crypto-currencies:
+
+@itemize
+@item Bitcoin Core.
+@item Bitcoin Cash-like.
+@item Litecoin.
+@end itemize")
     (license license:gpl3+)))
 
 (define-public flowee
diff --git a/gnu/packages/patches/fulcrum-1.9.1-unbundled-libraries.patch b/gnu/packages/patches/fulcrum-1.9.1-unbundled-libraries.patch
new file mode 100644
index 0000000000..327846b7aa
--- /dev/null
+++ b/gnu/packages/patches/fulcrum-1.9.1-unbundled-libraries.patch
@@ -0,0 +1,210 @@
+SPDX-FileCopyrightText: © 2023 Foundation Devices, Inc. <hello@foundationdevices.com>
+SPDX-License-Identifier: GPL-3.0-or-later
+
+These patch series allow to compile Fulcrum without using any bundled
+libraries.
+
+From 141d590b4189908a88ca07ad8e3880e4933e6427 Mon Sep 17 00:00:00 2001
+From: Jean-Pierre De Jesus DIAZ <me@jeandudey.tech>
+Date: Thu, 6 Jul 2023 14:56:53 +0200
+Subject: [PATCH 1/4] Add config to build without secp256k1
+
+Signed-off-by: Jean-Pierre De Jesus DIAZ <me@jeandudey.tech>
+---
+ Fulcrum.pro | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/Fulcrum.pro b/Fulcrum.pro
+index e7fdfde..2dad355 100644
+--- a/Fulcrum.pro
++++ b/Fulcrum.pro
+@@ -480,7 +480,7 @@ HEADERS += \
+ # Enable secp256k1 compilation on x86_64 only -- we don't actually use this lib
+ # yet in Fulcrum, so on platforms that aren't x86_64 it's ok to exclude it; it
+ # was included in case we wish to someday verify signatures in Fulcrum, etc.
+-contains(QT_ARCH, x86_64):!win32-msvc {
++contains(QT_ARCH, x86_64):!contains(CONFIG, config_without_bundled_secp256k1):!win32-msvc {
+     message("Including embedded secp256k1")
+ 
+     SOURCES += bitcoin/secp256k1/secp256k1.c
+-- 
+2.34.1
+
+
+From 093a43d02dd14039ae8aed992223e5167f3fb866 Mon Sep 17 00:00:00 2001
+From: Jean-Pierre De Jesus DIAZ <me@jeandudey.tech>
+Date: Thu, 6 Jul 2023 15:49:01 +0200
+Subject: [PATCH 2/4] Allow using system simdjson
+
+Signed-off-by: Jean-Pierre De Jesus DIAZ <me@jeandudey.tech>
+---
+ Fulcrum.pro              | 7 +++++++
+ src/Json/Json_Parser.cpp | 5 ++++-
+ 2 files changed, 11 insertions(+), 1 deletion(-)
+
+diff --git a/Fulcrum.pro b/Fulcrum.pro
+index 2dad355..c478af6 100644
+--- a/Fulcrum.pro
++++ b/Fulcrum.pro
+@@ -149,6 +149,13 @@ contains(CONFIG, config_endian_big) {
+ }
+ # /GIT_COMMIT=
+ 
++# simdjson
++contains(LIBS, -lsimdjson) {
++    message("simdjson: Using CLI override")
++    DEFINES += SYSTEM_SIMDJSON
++}
++# /simdjson
++
+ # ZMQ
+ !contains(LIBS, -lzmq) {
+     # Test for ZMQ, and if found, add pkg-config which we will rely upon to find libs
+diff --git a/src/Json/Json_Parser.cpp b/src/Json/Json_Parser.cpp
+index c24fe94..eb42eec 100644
+--- a/src/Json/Json_Parser.cpp
++++ b/src/Json/Json_Parser.cpp
+@@ -56,7 +56,10 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ 
+ // embed simdjson here, if we are on a known 64-bit platform and the header & sources are available
+ #if defined(__x86_64__) || defined(_M_AMD64) || defined(__aarch64__) || defined(_M_ARM64)
+-#if __has_include("simdjson/simdjson.h") && __has_include("simdjson/simdjson.cpp")
++#if defined(SYSTEM_SIMDJSON)
++#include <simdjson.h>
++#define HAVE_SIMDJSON 1
++#elif __has_include("simdjson/simdjson.h") && __has_include("simdjson/simdjson.cpp")
+ #include "simdjson/simdjson.h"
+ #include "simdjson/simdjson.cpp"
+ #define HAVE_SIMDJSON 1
+-- 
+2.34.1
+
+
+From 4c609cb1467478cb669b5ca2290606128543a48c Mon Sep 17 00:00:00 2001
+From: Jean-Pierre De Jesus DIAZ <me@jeandudey.tech>
+Date: Thu, 6 Jul 2023 15:56:01 +0200
+Subject: [PATCH 3/4] Allow using system robin-hood-hashing
+
+Signed-off-by: Jean-Pierre De Jesus DIAZ <me@jeandudey.tech>
+---
+ Fulcrum.pro        | 13 ++++++++++---
+ src/Controller.cpp |  2 +-
+ src/Storage.cpp    |  4 ++--
+ 3 files changed, 13 insertions(+), 6 deletions(-)
+
+diff --git a/Fulcrum.pro b/Fulcrum.pro
+index c478af6..99c7659 100644
+--- a/Fulcrum.pro
++++ b/Fulcrum.pro
+@@ -149,6 +149,16 @@ contains(CONFIG, config_endian_big) {
+ }
+ # /GIT_COMMIT=
+ 
++# robin-hood-hashing
++!contains(CONFIG, config_without_bundled_robin_hood) {
++    # Robin Hood unordered_flat_map implememntation (single header and MUCH more efficient than unordered_map!)
++    HEADERS += robin_hood/robin_hood.h
++    INCLUDEPATH += src/robin_hood/
++} else {
++    message("robin-hood-hashing: Using CLI override")
++}
++# /robin-hood-hashing
++
+ # simdjson
+ contains(LIBS, -lsimdjson) {
+     message("simdjson: Using CLI override")
+@@ -402,9 +412,6 @@ HEADERS += \
+     WebSocket.h \
+     ZmqSubNotifier.h
+ 
+-# Robin Hood unordered_flat_map implememntation (single header and MUCH more efficient than unordered_map!)
+-HEADERS += robin_hood/robin_hood.h
+-
+ RESOURCES += \
+     resources.qrc
+ 
+diff --git a/src/Controller.cpp b/src/Controller.cpp
+index 918c1f2..d0cab56 100644
+--- a/src/Controller.cpp
++++ b/src/Controller.cpp
+@@ -33,7 +33,7 @@
+ #include "bitcoin/crypto/common.h"  // ReadLE32
+ #include "bitcoin/rpc/protocol.h" // for RPC_INVALID_ADDRESS_OR_KEY
+ #include "bitcoin/transaction.h"
+-#include "robin_hood/robin_hood.h"
++#include <robin_hood.h>
+ 
+ #include <algorithm>
+ #include <cassert>
+diff --git a/src/Storage.cpp b/src/Storage.cpp
+index e74278c..0f0b91e 100644
+--- a/src/Storage.cpp
++++ b/src/Storage.cpp
+@@ -31,7 +31,7 @@
+ 
+ #include "bitcoin/hash.h"
+ 
+-#include "robin_hood/robin_hood.h"
++#include <robin_hood.h>
+ 
+ #if __has_include(<rocksdb/advanced_cache.h>)
+ // Newer rocksdb 8.1 defines the `Cache` class in this header. :/
+@@ -4537,7 +4537,7 @@ namespace {
+ } // end anon namespace
+ 
+ #ifdef ENABLE_TESTS
+-#include "robin_hood/robin_hood.h"
++#include <robin_hood.h>
+ namespace {
+ 
+     template<size_t NB>
+-- 
+2.34.1
+
+
+From 0e3888b12f62553b032a56b71d2c1545add080b6 Mon Sep 17 00:00:00 2001
+From: Jean-Pierre De Jesus DIAZ <me@jeandudey.tech>
+Date: Thu, 6 Jul 2023 16:04:57 +0200
+Subject: [PATCH 4/4] Allow using system cppzmq
+
+Signed-off-by: Jean-Pierre De Jesus DIAZ <me@jeandudey.tech>
+---
+ Fulcrum.pro            | 8 ++++++++
+ src/ZmqSubNotifier.cpp | 2 +-
+ 2 files changed, 9 insertions(+), 1 deletion(-)
+
+diff --git a/Fulcrum.pro b/Fulcrum.pro
+index 99c7659..0948834 100644
+--- a/Fulcrum.pro
++++ b/Fulcrum.pro
+@@ -186,6 +186,14 @@ contains(LIBS, -lsimdjson) {
+ }
+ # /ZMQ
+ 
++# cppzmq
++!contains(CONFIG, config_without_bundled_cppzmq) {
++    INCLUDEPATH += src/zmq
++} else {
++    message("cppzmq: Using CLI override")
++}
++# /cppzmq
++
+ # - Try and detect rocksdb and if not, fall back to the staticlib.
+ # - User can suppress this behavior by specifying a "LIBS+=-lrocksdb..." on the
+ #   CLI when they invoked qmake. In that case, they must set-up the LIBS+= and
+diff --git a/src/ZmqSubNotifier.cpp b/src/ZmqSubNotifier.cpp
+index 6b03784..48a41be 100644
+--- a/src/ZmqSubNotifier.cpp
++++ b/src/ZmqSubNotifier.cpp
+@@ -23,7 +23,7 @@
+ #if defined(ENABLE_ZMQ)
+ // real implementation
+ #define ZMQ_CPP11
+-#include "zmq/zmq.hpp"
++#include <zmq.hpp>
+ 
+ #include <QRandomGenerator>
+ 
+-- 
+2.34.1
+
