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unforgeable
Derived word form of forge

Example Sentences

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Among other things, he explains that cryptocurrency’s giant public ledger, the “instantaneous check of the blockchain, the unforgeable public record of who possessed every single bitcoin,” isn’t quite as secret as criminals had imagined.

From Washington Post • Dec. 29, 2022

When that iPhone takes a picture, it combines the image and the key to create an unforgeable signature, which it gives, along with the photo, to the photographer.

From Slate • Jul. 21, 2017

His Norse ditties have the unforgeable stamp of authenticity on every line.” 

From Souvenir of the George Borrow Celebration Norwich, July 5th, 1913 by Hooper, James

Aluminium, iron, platinum and many other metals may thus take up so much carbon as to become brittle and unforgeable.

From Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" by Various