id addresses the challenge of repeat abusers creating new accounts to evade bans on online platforms. It provides a system for issuing human proofs that allow platforms to require one verified human per high-risk account, without the need to store users' ID documents or manage a full KYC (Know Your Customer) process themselves. The core of the system is a user-held proof wallet, which supports different levels of assurance for identity verification based on risk.
The platform offers three assurance tiers: passkey continuity, signed presentation, and isHuman. Passkey continuity enables recognition of the same returning wallet through a stable, site-private PPID (privacy-preserving identifier), which is useful for continuity but does not prevent the creation of new wallets by abusers. Signed presentation allows a backend to verify a signed proof from the user's wallet before account creation or risky actions, ensuring trust without storing KYC data. The isHuman tier enforces one account per verified human, making it significantly harder for banned users to return with new credentials, as they must pass identity verification again.
id is designed for platforms where account rotation is a common attack vector, such as ticketing and presale drops, marketplaces, gaming, free trials, and rewards programs. It integrates with existing login and fraud detection systems, providing a durable identifier that links consequences to the person rather than to easily rotated credentials like email addresses or SIM cards. The platform does not replace existing authentication or moderation systems but enhances them by binding user records to site-private PPIDs and enabling enforcement actions based on verified human identity.
Additional features include verifiable audit stamps, where actions such as checkouts or posts can be stamped with an offline-verifiable proof that a verified human performed them. id's infrastructure, as all evidence resides within the platform's own systems. The service is intended to improve both security and user experience for returning verified users, reducing signup friction and enhancing Sybil resistance without the compliance burden of traditional KYC.
lemma.id is an Auth & identity product. It focuses on preventing bots and banned users from re-registering on online platforms by providing stable, privacy-preserving human identification. lemma.id is a B2B product aimed at online platform operators. The product ships for the web, the command line, and API.
Behind lemma.id is lemma.id, based in Indonesia, and the product first shipped in 2026. Among its 5 catalogued features are bot detection, ban enforcement, and Privacy-preserving ID. It exposes integrations via a public API.
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