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Hash matching is where media is given a unique digital signature which can be checked against hashes belonging to known content - in this case, databases of known CSAM.

The first issue of 10,000 NFTs featuring Brady carrying his digital signature and priced at up to $100 each instantly sold out, DraftKings announced.

Kipf then completed a State of Hawaii Death Certificate Worksheet, assigned himself as the medical certifier for the case and certified his death, using the digital signature of the doctor.

Instead, the application included only a typed note and copy of a digital signature, rather than an official document.

Now, another potential defense is gaining traction: digital watermarking, or the insertion of an indelible, covert digital signature into every piece of AI-produced content so the source is traceable.