Best Proof-of-Personhood Systems 2026

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8 providers match your requirements

Out of 8 ranked providers. 0 excluded.

What this ranks

Ranked here: proof-of-personhood systems, which issue identities meant to be unique to one person, for gating an airdrop, a vote or a faucet against sybils.Not ranked here: identity products whose identities are not meant to be unique to one person.8 of the 8 assessed are ranked.Requirements narrow the list; they never change a published ChainChoice Score. How the ranking works

Idena

How Idena was chosen

Wins the weighted total without leading any single criterion

Synchronous global validation ceremony

81 out of 100published score, #1 of all 8 worldwide

Evidence

High

4/4 criteria scored, with 4 dated sources quoted.

Biometric data collected and deletableMeasured cost to farm an identityUniqueness checkable without the issuer

Why it leads

Idena is 2 points ahead of Self, mainly because it scores higher on its cost to farm an identity and its biometric data and deletion.
Ahead of Self on cost to farm an identity (+2.0 points) and biometric data and deletion (+1.4 points)
Provider states broad availability

Tradeoff

Issuer independent uniqueness check: 2 points below the best in this ranking

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#ProviderPriceCompare

Zero-knowledge proofs over NFC government...

79 out of 100

Kleros-arbitrated registry

74 out of 100

Tied for #3 · ordered by name, A to Z

Iris-scanned Orb enrolment producing a...

74 out of 100

Weighted score aggregating third-party...

64 out of 100

Social-graph uniqueness derived from verified...

58 out of 100

Mobile passport-and-face verification issuing...

52 out of 100

Palm-biometric verification issued as...

46 out of 100

Provider	Cost to farm an identity (0–10)	ChainChoice Score
Proof of Humanity	9	74
World ID	9	74
Idena	8	81
Self	7	79
Humanity Protocol	6	46
Billions Network	5	52
Human Passport	4	64
BrightID	4	58

Provider	Verified population you can count (0–10)	ChainChoice Score
Idena	8	81
Self	8	79
Proof of Humanity	7	74
Human Passport	4	64
BrightID	4	58
World ID	3	74
Billions Network	2	52
Humanity Protocol	1	46

Provider	Issuer independent uniqueness check (0–10)	ChainChoice Score
Proof of Humanity	10	74
Self	9	79
Idena	8	81
World ID	8	74
Human Passport	7	64
Billions Network	3	52
BrightID	2	58
Humanity Protocol	1	46

Provider	Biometric data and deletion (0–10)	ChainChoice Score
Idena	10	81
BrightID	10	58
Self	9	79
World ID	8	74
Human Passport	8	64
Billions Network	5	52
Proof of Humanity	2	74
Humanity Protocol	2	46

	Provider					ChainChoice Score
1	Idena	8	8	10	8	81
2	Self	7	9	9	8	79
3	Proof of Humanity	9	10	2	7	74
4	World ID	9	8	8	3	74
5	Human Passport	4	7	8	4	64
6	BrightID	4	2	10	4	58
7	Billions Network	5	3	5	2	52
8	Humanity Protocol	6	1	2	1	46

How this ranking works

How firm the #1 is, the per-criterion arithmetic behind each score, who pays ChainChoice, and which proof of personhood were assessed and left out.

One point from changingIdena leads Self by 2 points

A one-point change on one criterion puts Self first, so read both.

See the arithmetic

Move measured cost to farm an identity — the heaviest criterion that changes it, weighted 32 — by a single point and Self takes first place. Both are worth reading. The published rankings file

Why this score4 published criteria · leads 2 of 4

Published criterionWtScore, and the best hereGap out of 10Pts

Measured cost to farm an identity7.7−188.2

Uniqueness checkable without the issuer6.2−286.7

Biometric data collected and deletable5.3·107.0

Verified population you can count4.8·85.1

Σ methodology points27.0/32

Each bar is the score on that criterion’s own 0–10 scale, never rescaled to the pool. The dark line is the best any product here reached on that axis. Wt is the most the criterion can add to the 86-point weighted total. Pts is weight × score × 32; the sum is the methodology score, and each weighted point behind the leader costs 2.6 on the displayed score. how these are weighted

Why it ranks first

Why Idena leads this category right now

Synchronous global validation ceremony in which every participant solves the same AI-resistant puzzles at the same moment, on a chain where one identity is one node. Strongest on biometric data collected and deletable (10/10): Idena collects no personal or biometric data: validation means solving image-sequence puzzles called flips in a synchronous session lasting under two minutes, with no document, face, palm or iris capture and no template held by anyone. Weakest on measured cost to farm an identity (8/10): Each identity must pass a synchronous validation ceremony, solving flips at the same moment as every other participant, and the ceremony still runs every epoch. Entry is rationed through invitations from validated nodes, which the whitepaper concedes can be sold and double-sold. Published price: Entry is not sold, it is rationed: "New invitations can only be sent out by validated nodes. The number of new invitations per node is limited and decreases as the network grows, while the total amount of generated invitations gets larger.

Best for

Biometric data collected and deletable — 10/10

Main tradeoff

The mechanism is intact and the network still validates on schedule, but 158 total identities at epoch 227, the last validation (2026-09-24) — down from 3,468 at epoch 100 and 172 at epoch 218, with 105 of them in a validated state when read on 2026-09-28 — means Idena is a research-grade sybil gate, not a distribution channel, and the buyer must also solve bridging its verdict to whatever chain they actually pay out on.

Verify before signup

Entry is not sold, it is rationed: "New invitations can only be sent out by validated nodes. The number of new invitations per node is limited and decreases as the network grows, while the total amount of generated invitations gets larger. The core Idena team is also granted to issue a limited number of invitations per epoch to support the growth of the network." (Idena whitepaper, Technology page, docs.idena.io/docs/wp/technology, re-fetched 28 September 2026, HTTP 200). No fee is charged to obtain an identity. The only posted capital figure is the stake below which a validated identity's votes are not counted, which the same page defines as "Identities having the stake below the threshhold of 0.5% * median_top100 , where median_top100 represents the median stake of top 100 accounts." The Idena indexer (api.idena.io/api/Epoch/228, fetched 28 September 2026, HTTP 200) reports "discriminationStakeThreshold":"115.805645452700191557" iDNA for epoch 228, validation scheduled 2026-09-29T15:00:00Z, down from 162.431920295848299628 iDNA at epoch 219 (api.idena.io/api/Epoch/219, same date) — a fall of about 46.63 iDNA (arithmetic: 162.43 − 115.81).

Recommendation summary

What should decide this category

What does it cost an attacker to produce one more accepted identity — and is that cost physically rate-limited or just a software fee?

Can a relying party settle the uniqueness question from public state, without the issuer's cooperation or uptime?

How many humans has this actually verified, and can you read that number without taking the vendor's word for it?

Quick picks

Strong options in this category

Start with the lead choice first, then use the shortlist only if you still need a challenger or stronger fit for a specific setup.

Best overall

Idena

Synchronous global validation ceremony in which every participant solves the same AI-resistant puzzles at the same moment, on a chain where one identity is one node.

Best for: Biometric data collected and deletable — 10/10

Measured cost to farm an identity · weight 32%8/10Uniqueness checkable without the issuer · weight 26%8/10Biometric data collected and deletable · weight 22%10/10Verified population you can count · weight 20%8/10

Quick pick

Self

Zero-knowledge proofs over NFC government document chips, with a per-scope nullifier and an identity commitment registry on Celo.

Zero-knowledge proofs over NFC government document chips, with a per-scope nullifier and an identity commitment registry on Celo. Strongest on uniqueness checkable without the issuer (9/10): Self's identity hub on Celo resolves all three identity registries, whose Merkle roots any caller can read, and an on-chain verification mode remains inside Self Enterprise. Self now calls its open-source SDK "legacy and deprecated", and Enterprise verifies proofs on Self's servers by default. Weakest on measured cost to farm an identity (7/10): Each identity rests on a genuine government document, by default a scanned passport chip, with a nullifier derived per document, so a holder of two valid passports can enrol twice. A Standard level that accepts a genuine document without a chip scan, and an Aadhaar path with no chip, are also offered. Published price: Self now publishes its tier structure on its home page FAQ, under "What does Self offer enterprises, and what does it cost?": "There are currently three tiers: Free, Starter (at $99/month) and Enterprise (contact sales)." (self.xyz, re-fetched 2026-09-28…

Best for: Uniqueness checkable without the issuer — 9/10

Measured cost to farm an identity · weight 32%7/10Uniqueness checkable without the issuer · weight 26%9/10Biometric data collected and deletable · weight 22%9/10Verified population you can count · weight 20%8/10

Quick pick

Proof of Humanity

Kleros-arbitrated registry where a video submission plus a vouch plus a refundable deposit buys an entry that any contract can query with isHuman.

Kleros-arbitrated registry where a video submission plus a vouch plus a refundable deposit buys an entry that any contract can query with isHuman. Strongest on uniqueness checkable without the issuer (10/10): Any contract can call isHuman(address) or isClaimed(bytes20) on Proof of Humanity's registries on Ethereum and Gnosis. Both are plain view functions that return false for an unregistered address, with no oracle, API or signer in the path; the maintainers direct integrations to the cross-chain proxies. Weakest on biometric data collected and deletable (2/10): Registration means "submitting a video of yourself holding your wallet address, along with a profile photo, display name". The Kleros product page describes no deletion or redaction path, and the registry contract has no function that removes submitted media. Published price: "Register by submitting a video of yourself holding your wallet address, along with a profile photo, display name, and a refundable deposit." (Kleros Proof of Humanity docs page, re-fetched 2026-09-28, HTTP 200).

Best for: Uniqueness checkable without the issuer — 10/10

Measured cost to farm an identity · weight 32%9/10Uniqueness checkable without the issuer · weight 26%10/10Biometric data collected and deletable · weight 22%2/10Verified population you can count · weight 20%7/10

Quick pick

Tied for #3 · ordered by name, A to Z

World ID

Iris-scanned Orb enrolment producing a zero-knowledge uniqueness proof that a consumer contract verifies on-chain, through the 4.0 WorldIDVerifier on World Chain, a WorldIDSatellite on Arc, or the bridged-root 3.0 routers on five EVM chains that World's docs now mark deprecated. Strongest on measured cost to farm an identity (9/10): Each World ID requires a distinct human iris presented in person to Orb hardware, and duplicate detection runs as a multi-party computation over iris codes that reveals only whether the user is a match. Brazil banned the scheme in January 2025 over payments to citizens for iris scans. Weakest on verified population you can count (3/10): No public counter returns World ID's population: identityCommitmentCount() reverts on the Ethereum identity manager. World's FAQ still shows the placeholder "[insert verified human ticker]" beside "roughly half" of "nearly 40 million", while the fees post says 12.3M are Orb-verified. Published price: "Usage will remain free for end users while applications will be charged for using World ID services.

Best for: Measured cost to farm an identity — 9/10

Measured cost to farm an identity · weight 32%9/10Uniqueness checkable without the issuer · weight 26%8/10Biometric data collected and deletable · weight 22%8/10Verified population you can count · weight 20%3/10

Considered and not ranked

None left out by name

We assessed 8 products here and rank all 8. No product has been turned away by name; when one is, its name and the reason appear here. Evidence last read 28 September 2026.

What this ranking does not assess

Liveness failure: the operator stops, censors you or loses data.
Exit failure: you cannot get out at par, on time, or with what is yours.

These can still cost you money here; the ranking does not measure them, so a high place says nothing about them. Which criterion scores each family, and why the others do not apply, is in /data/risk-coverage.json.

How this ranking is built

Reviewed on measured cost to farm an identity, uniqueness checkable without the issuer, biometric data collected and deletable, and verified population you can count.

Data checked Sep 2026 · Independent rankings · We show our work

Reviewed 28 September 2026Next review by 12 November 2026Published 11 August 2026Methodology v2026.11.1

How this page is reviewed

Reviewed means every product ranked on this page was read against its sources on or after that date; every ranked category is re-read at least every 45 days. Models research, extract and parse. A deterministic engine ranks. Every quote passes an adversarial refute pass.

Accountable for this review: Mathias Siemonsmeier, Founder.

How we review · Review calendar · Corrections log · How we make money

Direct answer

What is the best proof-of-personhood system in 2026?

Idena ranks #1 overall for proof of personhood on ChainChoice. Synchronous global validation ceremony in which every participant solves the same AI-resistant puzzles at the same moment, on a chain where one identity is one node. It holds that rank under an affiliate-blind methodology scored across 4 published, weighted criteria — the code that ranks providers physically cannot read affiliate payouts (CI-enforced), so a payout can't move a rank. The verdict re-computes on every fee change, incident, or regulatory action; the full reasoning and the audit receipt are under Methodology.

How you can lose money here, and what the ranking scores

Information failure: the number is wrong or bought, or your data leaks.
Scored by Measured cost to farm an identity · 32% (Idena 8/10, Self 7/10, Proof of Humanity 9/10)
Scored by Uniqueness checkable without the issuer · 26% (Idena 8/10, Self 9/10, Proof of Humanity 10/10)
Scored by Biometric data collected and deletable · 22% (Idena 10/10, Self 9/10, Proof of Humanity 2/10)
Scored by Verified population you can count · 20% (Idena 8/10, Self 8/10, Proof of Humanity 7/10)

Not assessed by this ranking: Liveness failure, Exit failure. A high place says nothing about these; the Methodology tab says what each means.

FAQs

3 questions readers ask before choosing proof of personhood.

Frequently asked

Questions people ask before choosing proof of personhood

How much does it actually cost to farm one more identity?

It depends entirely on whether the gate is a physical ceremony or an arithmetic threshold, and the score-based gate is the cheap one. Human Passport publishes both its threshold and its weights: threshold() returned 200000 (20.0000) on all six mainnet decoders on 2026-08-11 and the published weights re-verified digit for digit, which means the cost of clearing it is the cheapest basket of credentials that sums past 20. NFTScore#50 at 16.246 plus ETHScore#50 at 16.021 — two pure on-chain-activity credentials drawn from two separately capped categories — sum to 32.267, and neither requires a human to be identified at any point. Deduplication does not close the gap either, because the documentation binds it to "a given scoring instance", so the same evidence counts again for the next buyer. An exchange-issued account-bound token would not do the same job: it is minted only after the exchange completes KYC, so a human genuinely is identified. The systems at the other end of the range price the marginal identity in physical scarcity — a distinct iris presented in person, a distinct government document chip, or a live synchronous ceremony — which is the only cost a farmer cannot simply pay in software.

Can a relying party check uniqueness without the issuer?

Sometimes, and the failure modes are worth reading before you integrate. Proof of Humanity is the clean case: there is no issuer to ask, because the verdict is a view function on a deployed contract that a third party can call directly. Human Passport puts both the verdict and the threshold on chain, but its decoder does not fail closed — calling isHuman on an address that has never created a passport reverted with data 0x120a2e77 on all six mainnet decoders, and keccak256("AttestationNotFound()") independently produces those same leading four bytes. An integrator who writes the obvious `if (decoder.isHuman(user))` gets a reverted transaction rather than a rejection for the overwhelming majority of addresses. At the other extreme, Humanity Protocol's verification oracle is a single private key: on 2026-08-11 both the mainnet HumanityVerificationOracle and its FeeEscrow returned the same owner(), an address with no bytecode and a transaction count of zero — one externally owned account controlling both the contract that certifies humanity and the contract holding applications' prepaid balances, on a chain whose own documentation is headed "Mainnet temporarily offline" while it was in fact producing blocks one second apart.

What biometric data does each system take, and can you get rid of it?

The range runs from nothing at all to permanent public exposure. Self publishes a retention and deletion policy, BrightID publishes one for its social graph, and Humanity Protocol says where the palm template is stored and for how long; all three pages return HTTP 200 from links on the vendors' own home pages. Self's and BrightID's were favourable enough to raise their scores. Humanity's lowered its own: it reserves the right to "transfer and store your Biometric Data to our or our service providers' servers" and to retain personal information for "a period of five (5) years after the termination of such business relationship". At the bottom of this criterion sits the only system whose enrolment requirement is permanent public exposure of the user's face, which is not deletable by any mechanism the vendor offers.

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Best picks

Best proof of personhood in 2026

The buyer here is an airdrop, a governance vote or a faucet trying to price out sybils, so the only number that matters is what it costs an attacker to be counted twice — and the second number that matters is how many humans the gate can actually admit. Both are worse than the marketing. Every registry in this category that can be counted is two to three orders of magnitude smaller than what the category advertises: Self's three Celo registries held 4,369 identity commitments on 2026-08-11 against a claim of infrastructure "already accessible to billions of people across 180+ countries", and Proof of Humanity held 3,384 live humanities on Gnosis and 55 on Ethereum. The systems claiming millions are precisely the ones exposing no counter at all, and the one "live" home-page counter in the pool sat at exactly 2,560,606 on two separate read dates. Even the largest operator cannot state its own figure: World's FAQ still serves the unrendered placeholder "Already, [insert verified human ticker] people have verified their World ID at an Orb." while three different World-sourced totals run simultaneously. Choose on the cost of the marginal fake identity and on a population you can read yourself — a small honest number beats a large unverifiable one.

Best overall

Idena

Synchronous global validation ceremony in which every participant solves the same AI-resistant puzzles at the same moment, on a chain where one identity is one node.

Data checked Sep 2026

Best for: Biometric data collected and deletable — 10/10

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Keep exploring proof-of-personhood systems

The same published ranking, read for your country, side by side, or one provider at a time.

Every ranked provider, its full verdict

Best proof-of-personhood systems by country

How this category is defined

Proof-of-Personhood Systems: overview, criteria and weights

Written and reviewed by Mathias Siemonsmeier Founder

Not financial advice · For informational purposes only · Always do your own research

Proof of Personhood

Your setup

8 providers match your requirements

Why it leads

Tradeoff

Compare providers (0)

Cost to farm an identity

Verified population you can count

Issuer independent uniqueness check

Biometric data and deletion

All 4 published criteria

How this ranking works

What is the best proof-of-personhood system in 2026?

FAQs

Still unsure? Get your best proof of personhood pick

Best proof of personhood in 2026