Verify. Delegate. Approve.
One API for humans and AI agents. Every answer is a signed proof you keep — checkable by anyone, even offline.
‘Ask your AI’ copies a short brief — let your own model judge the fit.
No credit card required • 300 proofs free/month • Global coverage
Everything on the internet claims to be true.
A signed proof actually is.
§ 1 · What Proof secures
One API. All things verified.
Every verification, delegation, and approval ends the same way — you hold the signed proof.
Secure your business with a verification layer.
Verify someone controls a phone, email, or domain. Reverse OTP for phones — the user sends a message TO Proof; email uses magic link or OTP, domains use DNS/HTTP/admin email. Social accounts (OAuth) and crypto wallets (signing) are coming soon.
ReplacesPer-message OTP bills, DIY email loops, manual domain checks, screenshot of socials and wallets.
Prove the listing you stand behind.
Search a well-known product on an app registry and several listings answer to its name — the listing itself cannot say which is which.
A delegation is the note the company signs naming exactly one artifact — an MCP server, a package, a live endpoint — checkable by anyone, cancellable any day. Revoke it and every verifier reading the published status list sees the change within a minute, while the domain proof and every sibling delegation stay intact.
ReplacesAnyone can ship a package or an MCP server under your brand’s name, and you have no way to state publicly which ones you authorized.
Which one does the company stand behind? The listing has nowhere to say it.
one of these is our real package — the look-alikes are invented for this page
Secure your irreversible actions with human approval.
Human-in-the-loop approvals for irreversible actions. AI agents request sign-off via Telegram or WhatsApp before wires, deploys, or deletions; every decision is cryptographically signed.
Replaces“OK, send it” in a WhatsApp thread — sign-off nobody can prove later.
Secure your team with impersonation defense.
CEO-fraud wires, fake-exec requests — plus the family an impostor targets at home.
Anti-impersonation reverse verification. Enroll trusted challengers; when someone claiming to be you contacts them, one tap sends you a cross-channel confirmation — you approve or deny. Drills keep challengers trained.
ReplacesCode words and call-back rituals that get skipped when it matters.
incoming call · your saved number
The number checks out. Maria taps her challenger button anyway…
youShipping soon
§ 2 · The proof token
Proofs you keep,
not statuses you query
Every verification, delegation, and approval mints a signed ES256 bearer token. It accumulates into a portfolio you can present anywhere — and anyone can verify the signature offline against our published public key. No API call, no account needed at verification time.
Proof of what you hold. Hold the proof. That's the name: proof.holdings.
- Revocable — validity is checkable without exposing the underlying data
- Machine-readable for agents: 176 MCP tools speak the same proofs
eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCIsImtpZCI6InByb29mLTIwMjYifQ.eyJ0eXBlIjoicGhvbmUiLCJjbGFpbSI6ImNvbnRyb2wi...
✓ signature valid · verified offline
§ 3 · For developers
Ship verification in minutes
Official SDKs for JavaScript, Python, PHP, and Go — plus an MCP server for AI agents.
- Typed clients — automatic retries, polling, typed errors
- ES256-signed proof tokens for offline verification
- Test mode for development and staging
Works with
$ npm install @proof-holdings/sdk 1import { Proof } from '@proof-holdings/sdk'; 2 3const proof = new Proof('pk_live_...'); 4 5// Create a phone verification 6const verification = await proof.verifications.create({ 7 type: 'phone', 8 channel: 'whatsapp', 9 identifier: '+37069199199',10});1112// User sends code via WhatsApp13// Poll until verified (or use webhooks)14const result = await proof.verifications15 .waitForCompletion(verification.id);1617console.log(result.proof.token);18// "eyJhbGciOiJFUzI1NiI..."§ 4 · Under law
Human oversight is becoming law.
Already enforced by GDPR and 9 more oversight laws — and the AI regulations below take effect through 2027.
15 regulations · 36 jurisdictions · 10 in force today
Every deadline, and what each law requires — the full timeline.
When the audit comes, evidence is the hard part.
Screenshots and chat exports don't prove who approved what. A Proof token does — signed at the moment of decision, verified offline in seconds, ready to hand over.
Designed to support your oversight and record-keeping obligations — not legal advice.
Operated by LT Telekomunikacijos (LT Telecom) — an EU telecom software company.
One of 1,284 signed approvals this quarter — you hand over a token, not a screenshot folder.
And your proofs are electronic signatures.
You don't sign a document — you sign with an asset. Under eIDAS, an electronic signature is data in electronic form used to sign, and every proof token is exactly that. Verification, delegation, and approval are electronic signatures today.
How a proof token maps to eIDAS is our own assessment, not a legal determination — informational, not legal advice.
§ 5 · Pricing
Pay for outcomes, not attempts
SMS providers bill per message — delivered or not, verified or not. Proof bills per signed proof: one price for a completed verification, whatever the channel, wherever the user.
- €0pay as you go300 free proofs/monthno credit cardthen €0.03/proofStart free
- €9per month1,000 proofs/monthwebhooks · email supportthen €0.03/proofGet started
- €29per month3,000 proofs/monthcustom brandingthen €0.025/proofGet started
- €79per month10,000 proofs/monthpriority supportthen €0.02/proofrecommendedGet started
- Custom100,000+ proofs/monthbring your own channelsrate on agreementContact sales
That's not a discount.
It's a different billing unit — you buy signed proofs, not message attempts, and you keep them.
Start holding proofs.
Your first signed token is minutes away — 300 proofs free every month, no credit card.