Prepare release

Changelog.md

@@ -1,3 +1,38 @@
+### 2026-05-21: RNS 1.3.1
+
+This maintenance release fixes a single bug.
+
+**Changes**
+- Fixed regression in request response transfer size accumulator
+
+**Verified Retrieval**
+You can retrieve and verify this release over Reticulum using the built-in `rngit release` utility. To download all artifacts, and the release manifest for future updates, you can use the following command:
+
+```sh
+rngit release rns://7649a50d84610232d1416b41d2896aff/reticulum/reticulum fetch latest:all --signer bc7291552be7a58f361522990465165c
+```
+
+To retrieve only the `.whl` package for installation, and the release manifest, you can use:
+
+```sh
+rngit release rns://7649a50d84610232d1416b41d2896aff/reticulum/reticulum fetch "latest:rns-*-py3-none-any.whl" --signer bc7291552be7a58f361522990465165c
+```
+
+**Release Signatures**
+Release artifacts include a signed `rsm` release manifest and `rsg` signature files that can be validated against the RNS release signing identity `<bc7291552be7a58f361522990465165c>` using `rngit` or `rnid`. To perform an offline verification of all release artifacts using a manifest:
+
+```sh
+rngit release rns_*.rsm fetch latest:all --offline --signer bc7291552be7a58f361522990465165c
+```
+
+To verify releases using individual `rsg` files, while also verifying the manifest itself, download the `rsm` and `rsg` signatures, make sure they are in the same folder as the release artifact, and run `rnid` signature verification with the release identity as the required signer:
+
+```sh
+rnid -i bc7291552be7a58f361522990465165c -V rns_*.rsm *.rsg
+```
+
+The `rnid` utility will then verify the signatures, and display whether they are valid. If the signature cannot be verified, the release has been tampered with and should be discarded.
+
 ### 2026-05-21: RNS 1.3.0
 
 This maintenance release fixes a number of bugs.