Prove what's real, in the age of AI.
Lemma attaches cryptographic proofs to records, data, and AI runs, so whoever receives them can verify them on their own. Only what carries proof moves forward.
Verified proofs—Verify costFreeThese numbers can be verified, too →Proof Verifications
Verified proofs
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They look identical. Only the real one can be verified.
Same headline, same photo, same layout. Neither readers nor receiving systems can tell them apart.
Chasing fakes, with no end.
Take one down, another appears. Nothing is distinguishable, and the work of chasing piles up.
Stop chasing. Prove the real one.
One API call at publish time.
One tap to check, on the spot.
No app, no account, and verification is free.
From matching to distribution, straight through.
The receiving system matches the proof itself and moves straight to the next step.
Why this became necessary now.
Those who make
The cost of generating has fallen to zero. Things that look exactly like the real one can be copied without limit.
Those who act
AI agents act in people's place. Whose authority they ran under, and how far they went, is now the question.
Those who ask
Demands for explanation keep rising. Starting with Japan's amended privacy law, presenting the grounds is becoming the premise.
Cyber attacks, and AI and record failures, analyzed every week.
From public disclosures and primary sources, we set out what happened and what check would have caught it.163 cases · 16 countries and regions · weekly since May 2026
Checking by eye alone can no longer tell what is real.
Damage from cyber attacks is no longer a problem for only a few companies. Every case above happened where nothing could match whether what arrived, or what was recorded, was real — apart from how it looked. Lemma takes on that matching as a system.
What Lemma proves.
Each check that was missing in the cases above maps to one of five proofs. We can start from where in your workflow to attach which proof.
Keep the data.
Hand over only the proof.
Originals and personal data stay with you. What you hand over is only a proof that something is real, or that it meets a condition.
Where it fits, industry by industry.
Manufacturing & Critical Infra
Submitting inspection recordsReporting measurementsSee how it is used →Finance & FinTech
Checking counterpartiesExchanging recordsSee how it is used →Public Sector
Accepting applicationsChecking certificatesSee how it is used →Healthcare
Checking qualificationsOnboarding paperworkSee how it is used →Procurement & Supply Chain
Vetting suppliersChecking renewalsSee how it is used →Media & Content
Publishing articles and photosHandling impersonationSee how it is used →Services & Retail
Verifying membersSharing across group servicesSee how it is used →AI Adoption (cross-industry)
Explaining AI decisionsKeeping run recordsSee how it is used →Developers & Agent Ops
Delegating authorityLimiting what agents runSee how it is used →Three ways to start.
Transactions with agents, implementation in your product, or application to business processes. Start from the one closest to your goal.
Trust402
For those who delegate to agents, and those who sell to agents. Adds proofs on top of x402.
Try the sandboxLemma API
Five kinds of proofs through one API. Issuance is paid, once; verification is free, every time.
Read the docsEnterprise
See which steps can pass without stopping. Start with a conversation about your configuration.
Enterprise consultationLatest news
Only what carries proof moves forward.
Without waiting on a human check, records, data, and AI runs can pass to the next step. You can start with a single workflow.