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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2024 Artyom V. Poptsov <poptsov.artyom@gmail.com>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu packages specifications)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (guix gexp)
+  #:use-module (guix utils)
+  #:use-module (guix download)
+  #:use-module (guix git-download)
+  #:use-module (guix packages)
+  #:use-module (guix build-system copy))
+
+(define-public specification-multibase
+  (let ((commit "4c8344e37852773de155f587dcf5897771b3fc19")
+        (revision "1"))
+    (package
+      (name "specification-multibase")
+      (version (git-version "0.0.0" revision commit))
+      (source
+       (origin
+         (method git-fetch)
+         (uri (git-reference
+               (url "https://github.com/multiformats/multibase")
+               (commit commit)))
+         (file-name (git-file-name name version))
+         (sha256
+          (base32 "0lz4kdysa6nx7wf1i59647w7dgm344xpvfnsac3pfk2qdky2kq8b"))))
+      (build-system copy-build-system)
+      (arguments
+       '(#:install-plan
+         '(("." "share/multibase/"))))
+      (home-page "https://github.com/multiformats/multibase")
+      (synopsis "Self identifying base encodings")
+      (description
+       "Multibase is a protocol for disambiguating the encoding of
+base-encoded (e.g., @code{base32}, @code{base36}, @code{base64}, @code{base58}, etc.)
+binary appearing in text.")
+      (license (list license:expat license:cc-by-sa3.0)))))
+
+(define-public specification-multicodec
+  (let ((commit "36789e0856be22fa02f4dc55582ec670b2b4318b")
+        (revision "0"))
+    (package
+      (name "specification-multicodec")
+      (version (git-version "0.0.0" revision commit))
+      (source
+       (origin
+         (method git-fetch)
+         (uri (git-reference
+               (url "https://github.com/multiformats/multicodec")
+               (commit commit)))
+         (file-name (git-file-name name version))
+         (sha256
+          (base32 "0dyawicg8q4f8g6xj5bsj5l3c8rb8mrafjkrabc6a3p65845wp2r"))))
+      (build-system copy-build-system)
+      (arguments
+       '(#:install-plan '(("." "share/multicodec/"))
+         #:phases (modify-phases %standard-phases
+                    (delete 'strip))))
+      (home-page "https://github.com/multiformats/multicodec")
+      (synopsis "Compact self-describing codecs")
+      (description
+       "Multicodec is an agreed-upon codec table.  It is designed for use in binary
+representations, such as keys or identifiers (i.e @url{https://github.com/ipld/cid,
+CID}).")
+      (license (list license:expat license:cc-by-sa3.0)))))
+
+(define-public specification-multihash
+  (let ((commit "931febb97565395b1b6cd39ac677799df265a9e7")
+        (revision "0"))
+    (package
+      (name "specification-multihash")
+      (version (git-version "0.0.0" revision commit))
+      (source
+       (origin
+         (method git-fetch)
+         (uri (git-reference
+               (url "https://github.com/multiformats/multihash")
+               (commit commit)))
+         (file-name (git-file-name name version))
+         (sha256
+          (base32 "1axr35z3iz061fng0170bh873vy20rj2mspznycxm1qkrkrh7p5j"))))
+      (build-system copy-build-system)
+      (arguments
+       '(#:install-plan '(("." "share/multihash/"))
+         #:phases (modify-phases %standard-phases
+                    (delete 'strip))))
+      (home-page "https://github.com/multiformats/multihash")
+      (synopsis "Self-describing hashes")
+      (description
+       "Multihash is a protocol for differentiating outputs from various
+well-established cryptographic hash functions, addressing size + encoding
+considerations.")
+      (license (list license:expat license:cc-by-sa3.0)))))