The Clone Test: watch proof survive what kills the others.
Sixty seconds, real cryptography. We seal a work, then screenshot & recompress it — the exact move that strips a Content Credential — and prove the original still verifies while a clone fails. Everything below runs live in your browser.
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Beat oneSeal
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Beat twoAttack
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Beat threeVerify
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Beat fourProve & share
The original worksample
The mark, amplified ×24invisible
The verdict appears here once we run the test.
Ready
Press Run the Clone Test — or step through it yourself. No upload: the sample is generated and sealed entirely on your device.
real keyed watermark · real JPEG recompression · real Ed25519