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Thanks for spotting client seed save problem , we fixed it , as for sha512 hash we use hash_hmac function , which encrypt the server seed ( as string ) and the client seed ( as secret key ) , you can test it here : https://www.freeformatter.com/hmac-generator.html (select sha512 , put server seed in "Copy-paste the string here" and client seed in "Secret Key") , we will upload a verifier to another server and domain for 100% trust verification .