diff --git a/contrib/reproducible/guix/guix-build.sh b/contrib/reproducible/guix/guix-build.sh
index 79fd1257c..a2e385102 100755
--- a/contrib/reproducible/guix/guix-build.sh
+++ b/contrib/reproducible/guix/guix-build.sh
@@ -60,7 +60,7 @@ for project_folder in "" "gui"; do
     PROJECT_ROOT="$PWD/$project_folder"
     PROJECT_VENDOR_DIR="$VENDOR_DIR/$project_folder"
     PROJECT_OUT_DIR="$OUT_DIR/$project_folder"
-    PROJECT_PATCHES_ROOT="$PWD/contrib/reproducible/guix/patches/$project_folder"
+    PROJECT_PATCHES_ROOT="$PWD/contrib/reproducible/guix/liana-patches/$project_folder"
 
     project_needs_patches() {
         test "$(ls -A1q "$PROJECT_PATCHES_ROOT" |grep patch)"
diff --git a/contrib/reproducible/guix/manifest.scm b/contrib/reproducible/guix/manifest.scm
index 304e63011..aac15df94 100644
--- a/contrib/reproducible/guix/manifest.scm
+++ b/contrib/reproducible/guix/manifest.scm
@@ -1,3 +1,135 @@
+(use-modules
+  (gnu packages llvm)
+  (gnu packages rust)
+  (guix packages))
+
+;; Stolen from Bitcoin Core. Some patches are needed to bootstrap a newer rustc.
+(define-syntax-rule (search-our-patches file-name ...)
+  "Return the list of absolute file names corresponding to each
+FILE-NAME found in ./patches relative to the current file."
+  (parameterize
+      ((%patch-path (list (string-append (dirname (current-filename)) "/patches"))))
+    (list (search-patch file-name) ...)))
+
+;; What follows are the declaration of more recent rustc versions from the current Guix master
+;; (https://git.savannah.gnu.org/cgit/guix.git/tree/gnu/packages/rust.scm), which we can't use
+;; because it would require an unreasonable glibc version.
+
+(define rust-bootstrapped-package
+  (@@ (gnu packages rust) rust-bootstrapped-package))
+
+(define %cargo-reference-hash
+  (@@ (gnu packages rust) %cargo-reference-hash))
+
+(define rust-1.65
+  (@@ (gnu packages rust) rust-1.65))
+
+(define rust-1.66
+  (rust-bootstrapped-package
+   rust-1.65 "1.66.1" "1fjr94gsicsxd2ypz4zm8aad1zdbiccr7qjfbmq8f8f7jhx96g2v"))
+
+(define rust-1.67
+  (let ((base-rust
+          (rust-bootstrapped-package
+            rust-1.66 "1.67.1" "0vpzv6rm3w1wbni17ryvcw83k5klhghklylfdza3nnp8blz3sj26")))
+    (package
+      (inherit base-rust)
+      (source
+       (origin
+         (inherit (package-source base-rust))
+         (snippet
+          '(begin
+             (for-each delete-file-recursively
+                       '("src/llvm-project"
+                         "vendor/openssl-src/openssl"
+                         "vendor/tikv-jemalloc-sys/jemalloc"))
+             ;; Adjust rustix to always build with cc.
+             (substitute* '("Cargo.lock"
+                            "src/bootstrap/Cargo.lock")
+               (("\"errno\",") "\"cc\",\n \"errno\","))
+             ;; Add a dependency on the the 'cc' feature of rustix.
+             (substitute* "vendor/fd-lock/Cargo.toml"
+               (("\"fs\"") "\"fs\", \"cc\""))
+             (substitute* "vendor/is-terminal/Cargo.toml"
+               (("\"termios\"") "\"termios\", \"cc\""))
+             ;; Remove vendored dynamically linked libraries.
+             ;; find . -not -type d -executable -exec file {} \+ | grep ELF
+             (delete-file "vendor/vte/vim10m_match")
+             (delete-file "vendor/vte/vim10m_table")
+             ;; Also remove the bundled (mostly Windows) libraries.
+             (for-each delete-file
+                       (find-files "vendor" "\\.(a|dll|exe|lib)$"))))))
+      (inputs (modify-inputs (package-inputs base-rust)
+                             (replace "llvm" llvm-15))))))
+
+(define rust-1.68
+  (rust-bootstrapped-package
+   rust-1.67 "1.68.2" "15ifyd5jj8rd979dkakp887hgmhndr68pqaqvd2hqkfdywirqcwk"))
+
+(define rust-1.69
+  (let ((base-rust
+          (rust-bootstrapped-package
+            rust-1.68 "1.69.0"
+            "03zn7kx5bi5mdfsqfccj4h8gd6abm7spj0kjsfxwlv5dcwc9f1gv")))
+    (package
+      (inherit base-rust)
+      (source
+        (origin
+          (inherit (package-source base-rust))
+          (snippet
+           '(begin
+              (for-each delete-file-recursively
+                        '("src/llvm-project"
+                          "vendor/openssl-src/openssl"
+                          "vendor/tikv-jemalloc-sys/jemalloc"))
+              ;; Adjust rustix to always build with cc.
+              (substitute* '("Cargo.lock"
+                             "src/bootstrap/Cargo.lock")
+                (("\"errno\",") "\"cc\",\n \"errno\","))
+              ;; Add a dependency on the the 'cc' feature of rustix.
+              (substitute* "vendor/fd-lock/Cargo.toml"
+                (("\"fs\"") "\"fs\", \"cc\""))
+              (substitute* "vendor/is-terminal/Cargo.toml"
+                (("\"termios\"") "\"termios\", \"cc\""))
+              ;; Also remove the bundled (mostly Windows) libraries.
+              (for-each delete-file
+                        (find-files "vendor" "\\.(a|dll|exe|lib)$")))))))))
+
+(define rust-1.70
+  (let ((base-rust
+         (rust-bootstrapped-package
+          rust-1.69 "1.70.0"
+                      "0z6j7d0ni0rmfznv0w3mrf882m11kyh51g2bxkj40l3s1c0axgxj")))
+   (package
+     (inherit base-rust)
+     (source
+      (origin
+        (inherit (package-source base-rust))
+        (snippet
+         '(begin
+            (for-each delete-file-recursively
+                      '("src/llvm-project"
+                        "vendor/openssl-src/openssl"
+                        "vendor/tikv-jemalloc-sys/jemalloc"))
+             ;; Adjust rustix to always build with cc.
+             (substitute* "Cargo.lock"
+               (("\"errno\",") "\"cc\",\n \"errno\","))
+            ;; Add a dependency on the the 'cc' feature of rustix.
+            (substitute* '("vendor/is-terminal/Cargo.toml"
+                           "vendor/is-terminal-0.4.4/Cargo.toml")
+              (("\"termios\"") "\"termios\", \"cc\""))
+            ;; Also remove the bundled (mostly Windows) libraries.
+            (for-each delete-file
+                      (find-files "vendor" "\\.(a|dll|exe|lib)$"))))
+        ;; Rust 1.70 adds the rustix library which depends on the vendored
+        ;; fd-lock crate.  The fd-lock crate uses Outline assembly which expects
+        ;; a precompiled static library.  Enabling the "cc" feature tells the
+        ;; build.rs script to compile the assembly files instead of searching
+        ;; for a precompiled library.
+        (patches (search-our-patches "rust-1.70-fix-rustix-build.patch")))))))
+
+;; END of the newer rustc versions copied over from the current Guix master.
+
 (let ((is_gui (getenv "IS_GUI")))
   (concatenate-manifests
     (list
@@ -15,13 +147,10 @@
                     "eudev"
                     "fontconfig")
               '())))
-      ;; The GUI's MSRV is 1.65 and the daemon's 1.63.
+      ;; The GUI's MSRV is 1.70 and the daemon's 1.63. We just use the same rustc version for
+      ;; both.
       ;; FIXME: be able to compile against a specified glibc (or musl) instead of having to
-      ;; resort to not bumping the time machine and use at-the-time unpublished rustc.
+      ;; resort to backporting the newer rustc releases here. Also have proper Guix packages
+      ;; for the two projects.
       (packages->manifest
-        (if
-          (string=? is_gui "1")
-          (list
-            (@@ (gnu packages rust) rust-1.65))
-          (list
-            (@@ (gnu packages rust) rust-1.63)))))))
+        `(,rust-1.70)))))
diff --git a/contrib/reproducible/guix/patches/rust-1.70-fix-rustix-build.patch b/contrib/reproducible/guix/patches/rust-1.70-fix-rustix-build.patch
new file mode 100644
index 000000000..d72a8fb07
--- /dev/null
+++ b/contrib/reproducible/guix/patches/rust-1.70-fix-rustix-build.patch
@@ -0,0 +1,21 @@
+@@ -0,0 +1,20 @@
+--- a/vendor/fd-lock/Cargo.toml        2023-05-31 14:44:48.000000000 -0700
++++ b/vendor/fd-lock/Cargo.toml        2023-07-14 21:19:34.637702319 -0700
+@@ -45,7 +45,7 @@
+
+ [target."cfg(unix)".dependencies.rustix]
+ version = "0.37.0"
+-features = ["fs"]
++features = ["fs", "cc"]
+
+ [target."cfg(windows)".dependencies.windows-sys]
+ version = "0.45.0"
+--- a/src/bootstrap/Cargo.lock 2023-07-11 20:32:40.000000000 -0700
++++ b/src/bootstrap/Cargo.lock 2023-07-14 22:41:53.269284713 -0700
+@@ -618,6 +618,7 @@
+ dependencies = [
+  "bitflags",
++ "cc",
+  "errno",
+  "io-lifetimes",
+  "libc",
diff --git a/doc/BUILD.md b/doc/BUILD.md
index fceca1c7b..f36e73df3 100644
--- a/doc/BUILD.md
+++ b/doc/BUILD.md
@@ -12,7 +12,7 @@ community).  See [`CONTRIBUTING.md`](../CONTRIBUTING.md) for the currently minim
 supported by `lianad`.
 
 To build the GUI too, you'll unfortunately need a more recent Rust version. The minimum version
-supported by the GUI at the moment is `1.65`. You will most likely have to [manually download
+supported by the GUI at the moment is `1.70`. You will most likely have to [manually download
 it](#by-manually-downloading-the-latest-stable-version) or [use `rustup`](#through-rustup) to
 install more recent compilers.
 
@@ -50,11 +50,11 @@ And then you can download the archive corresponding to your system and CPU archi
 signature and use the `cargo` binary from this archive to build Liana. Here is an example for
 `amd64`:
 ```
-$ curl -O https://static.rust-lang.org/dist/rust-1.65.0-x86_64-unknown-linux-gnu.tar.gz
-$ curl -O https://static.rust-lang.org/dist/rust-1.65.0-x86_64-unknown-linux-gnu.tar.gz.asc
-$ gpg --verify rust-1.65.0-x86_64-unknown-linux-gnu.tar.gz.asc
-$ tar -xzf rust-1.65.0-x86_64-unknown-linux-gnu.tar.gz
-$ ./rust-1.65.0-x86_64-unknown-linux-gnu/cargo/bin/cargo build --release
+$ curl -O https://static.rust-lang.org/dist/rust-1.70.0-x86_64-unknown-linux-gnu.tar.gz
+$ curl -O https://static.rust-lang.org/dist/rust-1.70.0-x86_64-unknown-linux-gnu.tar.gz.asc
+$ gpg --verify rust-1.70.0-x86_64-unknown-linux-gnu.tar.gz.asc
+$ tar -xzf rust-1.70.0-x86_64-unknown-linux-gnu.tar.gz
+$ ./rust-1.70.0-x86_64-unknown-linux-gnu/cargo/bin/cargo build --release
 ```
 
 ### Through `rustup`