It looks like there is some confusion about the current version of the Nix installer.
According to their website it is 2.34.2, the latest release at GitHub is 2.34.1, but the install command points to 2.34.4.
Of course this is not going to work due to a SHA-256 hash mismatch.
Changing the URL to https://releases.nixos.org/nix/nix-2.34.2/install works, but this must be only one of the reasons why Determinate Systems decided to provide their own Nix installer.






