lemma.id

lemma.id is a human-proof system for abuse-resistant accounts. It is aimed at platforms that face account rotation, such as ticketing and presale drops, marketplaces, gaming, free trials, and rewards programs. The service is built around the problem of repeat abusers returning with new emails, SIMs, devices, and IPs after a ban.

Underneath it is a user-held proof wallet. The documentation describes three assurance levels: passkey continuity, signed presentation, and isHuman. Passkey continuity recognizes the same returning wallet with a stable, site-private PPID and is described as useful for continuity and for trying the integration. Signed presentation lets a backend verify a signed proof from the user’s wallet before account creation or a risky action, without KYC data landing on the site’s servers. The isHuman tier is the enforcement tier, requiring one account per verified human so that a ban can survive credential rotation. The system also includes a site-doubt flow that can force a fresh ID check on a suspect account without a permanent block.

The product is meant to sit alongside existing login, fraud, and moderation systems rather than replace them. The page says it fills the gap between login and KYC by giving those systems something durable to act on, and it notes that lemma.id keeps the proof private and verifiable on the site’s own backend. It also describes verifiable audit stamps: after verification, a site can stamp actions such as a checkout, a post, or a moderation call with an offline-verifiable proof that a verified human performed them, and later re-check the stamp without calling lemma.id.

The page presents lemma.id as an integration-based service, with one integration supporting the three assurance levels. It refers to a dashboard and sign-in area, and to SDK helpers such as stamp(), but it does not describe pricing or licensing terms.