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.
Proof Verifications
Verified proofs
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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 check to distribution, nothing stops.
The receiving system matches the proof itself and moves straight to the next step.
The same thing is happening here, too.
All of these could be checked by showing the original.
But you do not want to hand the original over.
Hand over the proof — not the original.
- Raw data never reaches us
- Third parties can verify from anywhere in the world
- Verification needs no key and no account
Inspection Record Assurance
Show inspection records and measurements to your counterparties without handing over the originals. No more re-collecting originals for every audit.
See this solution →Counterparty Record Verification
Check a counterparty's records without receiving the originals — and without the custody obligations that begin the moment you hold them.
See this solution →Certificate-less Procedures
Stop attaching certificates; pass only the fact that requirements are met. Window checks stop turning into waiting time.
See this solution →Qualified Worker Assurance
Show only that the qualification exists, without handing over personal details. The check is done before the assignment starts.
See this solution →Supplier Credential Monitoring
Check that a supplier's credentials are valid without collecting documents. Collection rounds at every renewal go away.
See this solution →Content Authenticity
Make the origin of published articles and photos verifiable after the fact — and step off the takedown treadmill.
See this solution →Cross-group Identity
Carry the same identity across services without distributing keys. No waiting on head-office lookups.
See this solution →AI Run Governance
Keep AI runs in a form you can later present with their grounds. When someone asks for an explanation, you have one to show.
See this solution →Agent Authority Control
What you hand an agent is not a key but a bounded authority. Anything outside the scope is stopped before it runs.
See this solution →The full list for all nine industries is in the solutions index.
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.
Checking one item at a time, by hand, no longer keeps up.
Hand the checking to machines. Verification is free — as many times as you need.
Proofs can be attached to records, data, and AI runs. There are five kinds of proofs. Combine them to fit the job.
Where does the proof layer fit into your business? 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 consultation
Only what carries proof moves forward.
The waiting-for-review step disappears — records, data, and AI runs pass straight to the next stage. You can start with a single workflow.