{"license":"CC-BY-4.0","licenseUrl":"https://creativecommons.org/licenses/by/4.0/","attribution":"ChainChoice (https://chainchoice.io)","category":"proof_of_personhood","evidenceReadAt":"2026-09-28","generatedAt":"2026-11-12","criteria":[{"id":"cost_to_farm_an_identity","label":"Measured cost to farm an identity","weight":32},{"id":"issuer_independent_uniqueness_check","label":"Uniqueness checkable without the issuer","weight":26},{"id":"biometric_data_and_deletion","label":"Biometric data collected and deletable","weight":22},{"id":"verified_population_you_can_count","label":"Verified population you can count","weight":20}],"providers":{"world_id-personhood":{"cost_to_farm_an_identity":{"s":9,"q":"In AMPC, only a binary result is revealed: whether the user is a match or not.","u":"https://world.org/blog/engineering/introducing-ampc-another-leap-privacy-performance-world-id","d":"2026-09-28"},"issuer_independent_uniqueness_check":{"s":8,"q":"WorldIDVerifier is deployed on World Chain Mainnet as an upgradeable proxy. | For legacy proofs, ensure groupId = 1 (Orb-only on-chain path).","u":"https://docs.world.org/world-id/idkit/onchain-verification","d":"2026-09-28"},"biometric_data_and_deletion":{"s":8,"q":"AMPC offers additional privacy protections by eliminating the need for storing iris codes and avoiding plaintext Hamming distances during the verification process. | neither World Foundation nor Tools for Humanity serve as parties in AMPC.","u":"https://world.org/blog/engineering/introducing-ampc-another-leap-privacy-performance-world-id","d":"2026-09-28"},"verified_population_you_can_count":{"s":3,"q":"Already, [insert verified human ticker] people have verified their World ID at an Orb. | World is live in 20+ countries and counting. Globally, nearly 40 million people have joined the network, with roughly half being verified humans.","u":"https://world.org/blog/world/world-faqs","d":"2026-09-28"}},"proof_of_humanity-personhood":{"cost_to_farm_an_identity":{"s":9,"q":"A registered Proof of Humanity user must vouch for your submission | Your submission enters a challenge period, during which anyone can dispute it. Challenges are resolved by Kleros Court.","u":"https://docs.kleros.io/products/proof-of-humanity","d":"2026-09-28"},"issuer_independent_uniqueness_check":{"s":10,"q":"function isHuman(address _account) public view override returns (bool) | function isClaimed(bytes20 _humanityId) external view override returns (bool)","u":"https://raw.githubusercontent.com/Proof-Of-Humanity/proof-of-humanity-v2-contracts/master/contracts/ProofOfHumanity.sol","d":"2026-09-28"},"biometric_data_and_deletion":{"s":2,"q":"Register by submitting a video of yourself holding your wallet address, along with a profile photo, display name, and a refundable deposit.","u":"https://docs.kleros.io/products/proof-of-humanity","d":"2026-09-28"},"verified_population_you_can_count":{"s":7,"q":"/// @dev The number of humanities registered at some moment. | if (requestId == 0) humanityCount++;","u":"https://raw.githubusercontent.com/Proof-Of-Humanity/proof-of-humanity-v2-contracts/master/contracts/ProofOfHumanity.sol","d":"2026-09-28"}},"human_passport-personhood":{"cost_to_farm_an_identity":{"s":4,"q":"Passport data scientists use datasets of known Sybils and known humans to analyze how credentials are used by good and bad actors | it is not a perfect system. Not all Sybils will be eliminated at that threshold.","u":"https://docs.passport.human.tech/building-with-passport/stamps/major-concepts/scoring-thresholds","d":"2026-09-28"},"issuer_independent_uniqueness_check":{"s":7,"q":"score is above the minimum threshold, which is currently set to 20 | This method will revert with an error is a valid score is not found","u":"https://docs.passport.human.tech/building-with-passport/stamps/smart-contracts/contract-reference","d":"2026-09-28"},"biometric_data_and_deletion":{"s":8,"q":"high human signal activities throughout web3 and web2 | Users can choose to verify with KYC, biometrics, web3 activity, web of trust, and web2 activity Stamps","u":"https://docs.passport.human.tech/","d":"2026-09-28"},"verified_population_you_can_count":{"s":4,"q":"over 2.3M Passports have been created","u":"https://passport.human.tech/blog/proof-of-personhood-explained-how-it-works-who-s-building-it-and-why-it-matters-now","d":"2026-09-28"}},"self_protocol":{"cost_to_farm_an_identity":{"s":7,"q":"document-backed nullifiers: one person, one account | a nullifier from limited signed fields","u":"https://docs.self.xyz/llms.txt","d":"2026-09-28"},"issuer_independent_uniqueness_check":{"s":9,"q":"Backend (the default): proofs are verified by Self's servers. | On-chain: proofs are verified by a smart contract on Celo.","u":"https://docs.self.xyz/docs/self-enterprise/flows/verification-modes/","d":"2026-09-28"},"biometric_data_and_deletion":{"s":9,"q":"We do not have the ability to access, decipher, or read this encrypted biometric data. | This facial data is used only to complete the check and is not stored by us.","u":"https://self.xyz/privacy","d":"2026-09-28"},"verified_population_you_can_count":{"s":8,"q":"Deployments (Legacy) | IdentityRegistry","u":"https://docs.self.xyz/docs/self-pass/architecture/deployments/","d":"2026-09-28"}},"brightid":{"cost_to_farm_an_identity":{"s":4,"q":"a privacy-first social identity network that allows you to prove to applications that you are accessing them fairly with only one account | Meets verification","u":"https://www.brightid.org/","d":"2026-09-28"},"issuer_independent_uniqueness_check":{"s":2,"q":"A template contract that can be used to publish BrightID verifications signed by trusted BrightID nodes on-chain. | Apps can query the signed verifications from trusted BrightID nodes using:","u":"https://raw.githubusercontent.com/BrightID/BrightID-SmartContract/master/README.md","d":"2026-09-28"},"biometric_data_and_deletion":{"s":10,"q":"Your photo, name, and other identifying information you enter in your profile are not collected by BrightID. | Since we don't collect information, you don't need to request deletion. | We do not store personal information on servers.","u":"https://www.brightid.org/privacy-policy-terms-of-use","d":"2026-09-28"},"verified_population_you_can_count":{"s":4,"q":"70K+ | Sponsored Public | Apps Integrated","u":"https://www.brightid.org/","d":"2026-09-28"}},"billions_network-personhood":{"cost_to_farm_an_identity":{"s":5,"q":"Proves you are a real, unique human using a one-time face scan. | Combines uniqueness with identity document verification for a higher level of trust.","u":"https://docs.billions.network/billions-wallet/overview.md","d":"2026-09-28"},"issuer_independent_uniqueness_check":{"s":3,"q":"The Relay makes two on-chain calls on the Billions Network. | verifies the ZK proof on-chain and stores it against the human","u":"https://docs.billions.network/agents/identity-architecture.md","d":"2026-09-28"},"biometric_data_and_deletion":{"s":5,"q":"Face data is never retained indefinitely. | deleted within 180 days of credential expiry or account deletion (whichever is earliest) | for the duration of the Proof of Uniqueness credential validity period (up to 5 years) solely to enable ongoing uniqueness verification and prevent duplicate…","u":"https://billions.network/privacy-policy","d":"2026-09-28"},"verified_population_you_can_count":{"s":2,"q":"2.5M+ verified users, agents bound to the humans behind them","u":"https://billions.network/","d":"2026-09-28"}},"humanity_protocol":{"cost_to_farm_an_identity":{"s":6,"q":"User has verified via Palm check | User has connected Google | User has verified email ownership","u":"https://docs.humanity.org/build-with-humanity/build-on-chain/credentials-verification-service.md","d":"2026-09-28"},"issuer_independent_uniqueness_check":{"s":1,"q":"Oracle backend checks user credentials | The Oracle creates an on-chain attestation and calls your contract","u":"https://docs.humanity.org/build-with-humanity/build-on-chain/credentials-verification-service.md","d":"2026-09-28"},"biometric_data_and_deletion":{"s":2,"q":"Biometric Data (such as palmprint and vein image) collected through a hardware | transfer and store your Biometric Data to our or our service providers' servers | for a period of five (5) years after the termination of such business relationship","u":"https://www.humanity.org/privacy-policy","d":"2026-09-28"},"verified_population_you_can_count":{"s":1,"q":"Mainnet temporarily offline | Humanity Mainnet is being relaunched with updated infrastructure following a security incident. Network values below remain accurate but the network is not currently available for transactions.","u":"https://docs.humanity.org/build-with-humanity/build-on-chain/network-information-mainnet.md","d":"2026-09-28"}},"idena":{"cost_to_farm_an_identity":{"s":8,"q":"Idena employs regular checkpoint rituals — synchronous validation sessions — to certify a participants’ humanness for the consequent epoch. | The pace of network growth is restricted to minimize the probability of a Sybil attack.","u":"https://docs.idena.io/docs/wp/technology","d":"2026-09-28"},"issuer_independent_uniqueness_check":{"s":8,"q":"implements a Proof-of-Person Sybil control mechanism and committee-based consensus | Every full node corresponds to one validated person with an equal chance to be rewarded for the minting of new blocks and equal voting power in the consensus and governance process","u":"https://docs.idena.io/docs/wp/technology","d":"2026-09-28"},"biometric_data_and_deletion":{"s":10,"q":"Idena does not require any personal data sharing, does not reveal a person’s identity, and does not need a third-party identification center. | utilizes four images. To solve a flip, the participant chooses between two sequences of these images, only one of which makes narrative sense.","u":"https://docs.idena.io/docs/wp/technology","d":"2026-09-28"},"verified_population_you_can_count":{"s":8,"q":"{\"value\":\"Human\",\"count\":78},{\"value\":\"Newbie\",\"count\":17},{\"value\":\"Suspended\",\"count\":35},{\"value\":\"Undefined\",\"count\":14},{\"value\":\"Verified\",\"count\":10},{\"value\":\"Zombie\",\"count\":4}","u":"https://api.idena.io/api/Epoch/227/IdentityStatesSummary","d":"2026-09-28"}}}}