Hi ,
It's very difficult to confirm the SHA1, as it's not available in the ISO download files directly from Microsoft. However, you can download the official version directly from Microsoft's website, as SHA1 is displayed on different sites.
Windows 10 2021 LTSC: https://software-download.microsoft.com/download/db/444969d5-f34g-4e03-ac9d-1f9786c69161/19044.1288.211006-0501.21h2_release_svc_refresh_CLIENT_LTSC_EVAL_x64FRE_en-us.iso
Font: https://www.microsoft.com/pt-br/evalcenter/download-windows-10-enterprise
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Thanks