add blog article about new client API

docs/blog/2023-06-14-new-client-interface.md

@@ -0,0 +1,50 @@
+---
+title: Mithril client has got a brand new interface
+authors:
+- name: Mithril Team
+tags: [client, certificate, mithril-stake-distribution]
+---
+
+### Mithril client interface is evolving
+
+For the last few months, we have implemented the capability for the Mithril protocol to sign multiple types of data: on top of the already existing Cardano node database snapshots, the Mithril stake distribution is now also signed on its own. 
+In order to make the client able to work on the different types of data that are certified, we have changed its command line API.
+For example:
+
+```
+$> ./mithril-client list
+```
+
+This command was previously used to list Cardano node snapshots. It has been abandoned in favor of a more explicit syntax:
+
+```
+$> ./mithril-client snapshot list
+```
+
+Furthermore, the old version had two different subcommands to 1. download and 2. verify a snapshot. These 2 commands have now be merged into one single `download` command:
+
+```
+$> ./mithril-client snapshot download  5109c1eaa6619bc…
+```
+
+This organization of the client opens the use of a new `mithril-stake-distribution` sub-command:
+
+```
+$> ./mithril-client mithril-stake-distribution list
+```
+
+Which can be aliased into a handy
+
+```
+$> ./mithril-client msd list
+```
+
+As for the Cardano snapshots, it is possible to download and verify the stake distribution involved in Mithril multi-signatures as a JSON file:
+
+```
+$> ./mithril-client msd download 713e2803e998f…
+```
+
+If the file certification can be verified, it is saved on the disk.
+
+Feel free to reach out to us on the [Discord channel](https://discord.gg/5kaErDKDRq) for questions and/or help.