# DataHubz Attest

> Attest is a document signing and verifiable records service by DataHubz. Signers approve with a passkey and need no account or password, documents are encrypted in the browser before upload, every completed agreement is anchored on the Base public blockchain, and anyone can verify a signed copy for free, even if Attest is unavailable.

Key facts:

- Pricing: the Free plan includes 2 documents sent for signature, in total; free accounts that use the other tools also get 10 records a month for them (receipts, compliance proofs, Proof Cards, certificates, sealed calls, approval releases, continuity vaults and Verified Forms, through the dashboard or the API). Each document a free account sends for signature counts against both: it uses one of the 2 documents and one of that month's records. The Signing plan is $5 a month for 20 documents. Pro is $49 a month for every Attest tool and the API, with 10,000 records a month. The people who sign never pay, on any plan, and never need a crypto wallet.
- Signing: the sender uploads a PDF and places signature, initials, date, full name and text fields. Each signer gets an email with their own link, sets up a passkey in one step and approves with it (Face ID, Touch ID, Windows Hello or their device PIN). For a signer new to Attest, the sender chooses at Send. Ready now (the default) lets them open and sign as soon as they set up their passkey. With Private from the start and automatic unlocking on, the document is unlocked by the sender's own devices, usually within seconds of the signer's passkey when one of them with notices allowed is online (a computer, with its browser running); a device is turned on with the sender's passkey. Otherwise (none has done it within 15 minutes, the switch was off, or the agreement was created through the API without a sealed copy for delivery), the sender is emailed and unlocks it by hand. Signers can sign in any order or one at a time, with automatic reminders and expiry dates.
- Privacy: documents are encrypted in the sender's browser (AES-256-GCM) and decrypted only on the parties' devices. Every document is end-to-end encrypted, and the sender chooses how private: Private from the start means only the sender and their signers can ever open it; Ready now lets a new signer open it right away, end-to-end encrypted from the moment they do. Ready now keeps a sealed copy of the document's key with Attest's signing service until the signer first opens it, then deletes that copy. Attest stores the document only as ciphertext, including the copies for the sender's devices, which are encrypted to keys made on those devices that never leave them; only fingerprints go on the blockchain.
- Evidence: every party receives the same sealed PDF: the signed pages, with a "Signed with Attest" stamp on every signature and a seal line at the foot of every page, a certificate of completion, the audit trail up to completion and a "Verify it yourself, without us" page, with the full evidence (attest-evidence.json), the original document (original-document.pdf) and a standalone open-source verifier (attest-verifier.html) attached inside. Each stamp's verification code and QR code lead anyone to the record.
- Verification: free, with no account, at https://attest.datahubz.com/verify, by ID, by fingerprint, or by dropping the file. The open-source verifier checks signatures, fingerprints and the blockchain anchor on the reader's own device.
- Blockchain: records are anchored on Base mainnet (chain 8453), and zero-knowledge proofs are verified on zkVerify. Records anchored before Attest moved to Base, in October 2026, were anchored on Horizen, and they stay verifiable with Base alone: Attest keeps a proof of each one that checks against the output roots Horizen's L3 posted to Base.
- Zero-knowledge proofs: Share proof shows one fact, that a party signed an agreement (alone or with a named co-signer) and the day it was completed, without revealing the document, its title or its terms. Proofs are verified on zkVerify.
- Legal validity: electronic signatures are recognized for most agreements in the United States (the ESIGN Act and UETA) and the European Union (eIDAS). Some documents, such as wills or certain notarized deeds, have special rules in many places: check yours.
- AI assistants: the Attest connector, a remote MCP server at https://attest.datahubz.com/mcp, lets Claude, ChatGPT, Cursor and other MCP apps check records, list agreements, remind signers, prepare agreements for the person to send, record receipts and share proofs, after the person signs in and approves it. It never receives a document's contents or a key, and it can't sign: each signer signs with their own passkey.
- Beyond signing (Pro): receipts for any file or event, Proof Cards issued as W3C Verifiable Credentials, certificates, sealed submissions, approval release, a continuity vault, Verified Forms, and a REST API.
- Company: DataHubz, Colorado Springs, Colorado, United States. https://www.datahubz.com

## Product

- [Sign documents you can prove](https://attest.datahubz.com/index.md): What Attest is: document signing, receipts, zero-knowledge proofs, Proof Cards and verification, with plans and prices.
- [Document signing](https://attest.datahubz.com/sign.md): How signing works, what signers see, how Attest compares with other e-signature tools, legal validity, and common questions.
- [Demo](https://attest.datahubz.com/demo.md): A narrated three-minute film of every Attest tool, with captions.
- [Tutorials](https://attest.datahubz.com/tutorials.md): Narrated video tutorials for signing documents with Attest, recorded on the real app.
- [Verify](https://attest.datahubz.com/verify.md): The free public verifier: check any Attest record, signed copy, certificate or proof without an account.

## Documentation

- [Introducing Attest](https://attest.datahubz.com/docs.md): The overview: what Attest is, why it exists, how it works, its trust model and vocabulary.
- [API reference](https://attest.datahubz.com/docs/api.md): The REST API: authentication, receipts, agreements, proofs, Proof Cards, certificates, sealed sharing, Verified Forms, verification and webhooks.
- [Integrations](https://attest.datahubz.com/docs/integrations.md): The Integrations API for platforms: per-organization wallets, events, daily zero-knowledge state proofs, webhooks and the TypeScript client.
- [Connector for AI assistants](https://attest.datahubz.com/docs/connector.md): The Attest connector, a remote MCP server: what an AI assistant can do with your records, why it can't read documents or sign, and how to add it to Claude, ChatGPT, Claude Code or Cursor.

## Compare

- [E-signature services compared](https://attest.datahubz.com/compare.md): Attest compared with other e-signature services, with prices as published and sources.
- [Attest vs DocuSign](https://attest.datahubz.com/compare/attest-vs-docusign.md): Attest and DocuSign compared on encryption, signer experience, independent verification and price, with DocuSign's prices as published.
- [Attest vs Adobe Acrobat Sign](https://attest.datahubz.com/compare/attest-vs-adobe-acrobat-sign.md): Attest and Adobe Acrobat Sign compared on encryption, how signers sign, independent verification and price, with Adobe's details as published.
- [Attest vs Dropbox Sign](https://attest.datahubz.com/compare/attest-vs-dropbox-sign.md): Attest and Dropbox Sign compared on encryption, how signers sign, independent verification and paid plans, with Dropbox Sign's prices as published.
- [The best DocuSign alternatives in 2026](https://attest.datahubz.com/compare/best-docusign-alternatives.md): DocuSign alternatives compared on encryption, independent verification and entry price: Attest, Adobe Acrobat Sign, Dropbox Sign, PandaDoc, Zoho Sign, SignNow, Documenso, DocuSeal and OpenSign.
- [Which e-signature services can read your documents?](https://attest.datahubz.com/compare/which-e-signature-services-can-read-your-documents.md): What 21 e-signature services say about encryption, quoted from their own pages, which of them can decrypt your documents, and how to check any vendor's claim.
- [Attest vs PandaDoc](https://attest.datahubz.com/compare/attest-vs-pandadoc.md): Attest and PandaDoc compared on encryption, how signers sign, proof after the account ends, sales features and price, with PandaDoc's plans as published.
- [Attest vs Zoho Sign](https://attest.datahubz.com/compare/attest-vs-zoho-sign.md): Attest and Zoho Sign compared on encryption, how signers sign, blockchain anchoring, verification, legal tiers and price, with Zoho Sign's plans as published.
- [Attest vs SignNow](https://attest.datahubz.com/compare/attest-vs-signnow.md): Attest and SignNow compared on encryption, how signers sign, invite allowances and overage, proof after a plan ends and price at 20 documents a month.
- [Attest vs Documenso, DocuSeal and OpenSign](https://attest.datahubz.com/compare/attest-vs-open-source-e-signature.md): Attest compared with the open-source e-signature tools Documenso, DocuSeal and OpenSign on self-hosting, encryption, who signs the PDF, open verification and price.
- [Attest vs Clicksign](https://attest.datahubz.com/compare/attest-vs-clicksign.md): Attest and Clicksign compared on encryption, how signers sign, ICP-Brasil and Brazilian law, long-term verification and price in reais.
- [Attest vs ZapSign and D4Sign](https://attest.datahubz.com/compare/attest-vs-zapsign-and-d4sign.md): Attest compared with the Brazilian e-signature services ZapSign and D4Sign on encryption claims, ICP-Brasil, signer checks, later verification and price in reais.
- [Attest vs Youtrust (formerly Yousign)](https://attest.datahubz.com/compare/attest-vs-youtrust.md): Attest compared with Youtrust (formerly Yousign) on encryption, eIDAS signature levels, signer identity, the evidence each party keeps and price in euros.
- [Attest vs Signaturit](https://attest.datahubz.com/compare/attest-vs-signaturit.md): Attest compared with Signaturit (Namirial) on encryption, eIDAS signature levels, Spain's evidence rules, long-term validity of signed copies and price in euros.
- [Attest vs Mifiel](https://attest.datahubz.com/compare/attest-vs-mifiel.md): Attest compared with Mifiel (Mexico) on end-to-end encryption, e.firma and passkey signing, NOM-151 conservation, verification, Mexican law and price in pesos.
- [The best e-signature for a few documents a month](https://attest.datahubz.com/compare/best-e-signature-for-a-few-documents.md): The best e-signature for a few documents a month: free allowances and lowest monthly prices of 11 services as published, what free plans leave out, and how Attest's $5 plan works.
- [Which e-signatures still verify if the vendor is gone?](https://attest.datahubz.com/compare/e-signature-proof-if-vendor-is-gone.md): 21 e-signature services compared on how a signed document is checked and what the check still needs from the vendor: certificate seals, national validators, vendor records, timestamps and blockchain anchors.

## Guides

- [E-signature guides](https://attest.datahubz.com/guides.md): Answers on e-signature privacy, verification and proof.
- [Can your e-signature company read your contracts?](https://attest.datahubz.com/guides/can-e-signature-company-read-your-contracts.md): Why most e-signature services can read your documents, and how Attest's end-to-end encryption lets you choose that only you and your signers can ever open them.
- [Do e-signature providers train AI on your documents?](https://attest.datahubz.com/guides/e-signature-ai-training.md): What e-signature providers publish about training AI on customer documents, quoted with dates, and how Attest keeps documents out of AI: no AI features process them, and you choose who can ever open them.
- [How to verify that a signed document is genuine](https://attest.datahubz.com/guides/verify-signed-document.md): What makes a signed document genuine, how e-signature services let you check one, and how to verify an Attest document for free, online or with no Attest service at all.
- [How to verify a signed PDF without Adobe Acrobat](https://attest.datahubz.com/guides/verify-signed-pdf-without-adobe.md): What Adobe Acrobat's signature panel checks, the free alternatives for checking a signed PDF, and how an Attest signed PDF is verified in any browser with the open-source verifier it carries.
- [How to tell if a document was changed after signing](https://attest.datahubz.com/guides/document-changed-after-signing.md): How document fingerprints (SHA-256 hashes) reveal a change after signing, how Attest's verifier checks the original document, each signer's entries and the signed pages against what was signed and anchored, and what to do if verification fails.
- [What if your e-signature company shuts down?](https://attest.datahubz.com/guides/what-happens-if-e-signature-company-shuts-down.md): What happens to signed documents when an e-signature vendor shuts down, what DocuSign, Adobe, Dropbox Sign, PandaDoc and SignNow say about retention, and how Attest signed copies verify without Attest.
- [Closed your account? Proving what you signed](https://attest.datahubz.com/guides/closed-account-prove-signed-documents.md): What happens to your signed documents when an e-signature plan lapses or an account closes, how to still prove them, and why Attest signed copies verify without any account.
- [How to prove someone signed a document electronically](https://attest.datahubz.com/guides/prove-someone-signed-electronically.md): What evidence proves an electronic signature, how most services record it, and how Attest's per-signer passkey signatures and public anchors let anyone check it.
- ["I never signed that": proving an e-signature](https://attest.datahubz.com/guides/i-never-signed-that.md): What to do when a counterparty denies an electronic signature: how disputes are argued, what evidence to gather, and how Attest's per-signer passkey signatures answer each objection.
- [How to let others check a signed document](https://attest.datahubz.com/guides/let-others-verify-signed-document.md): Four ways to let a lender, landlord, employer, auditor or partner confirm an Attest signed document, free and with no account: the signed copy, the certificate link, the verification code and Share proof.
- [How to prove you signed without sharing the contract](https://attest.datahubz.com/guides/prove-you-signed-without-sharing-contract.md): How to prove you signed an agreement, with whom and the date it was completed, without revealing the document, using Attest's zero-knowledge Share proof verified on zkVerify.
- [How to sign a confidential agreement privately](https://attest.datahubz.com/guides/sign-confidential-agreements.md): How to sign salary and offer letters, term sheets and board consents privately: what each part of a signing request reveals, and the Attest settings that keep the terms between the parties.
- [Is it safe to upload a contract to a free PDF site?](https://attest.datahubz.com/guides/free-pdf-signing-sites-safety.md): What the free PDF-signing sites we checked (Smallpdf, iLovePDF and Sejda) do with an uploaded contract (their own retention and encryption statements), what a placed signature image proves, four questions to ask before uploading, and a free, end-to-end encrypted alternative.
- [What a breach at an e-signature company exposes](https://attest.datahubz.com/guides/e-signature-breach-what-is-exposed.md): Layer by layer, what a breach at an e-signature service can expose, what Dropbox Sign (2024) and DocuSign (2017) reported, what a breach of Attest's servers would and would not reveal, and what to do after a breach notice.
- [Does Face ID or my fingerprint get sent when I sign?](https://attest.datahubz.com/guides/face-id-fingerprint-when-signing.md): Why signing with Face ID, Touch ID, Windows Hello or a fingerprint never sends biometric data: the WebAuthn and FIDO standards, what Apple, Google and Microsoft say, and exactly what Attest receives and keeps when you sign.
- [How to tell a real signing request from phishing](https://attest.datahubz.com/guides/signing-request-or-phishing.md): How to spot a fake signing request: the general warning signs, what every Attest email contains and where its links point, why a passkey can't be used on a copycat site, and how to check a request without clicking.
- [Passkeys for signing documents, explained](https://attest.datahubz.com/guides/passkeys-for-signing-explained.md): Passkeys explained for people who sign documents: the standards behind them, how they differ from passwords, passkeys that sync and passkeys kept on one device, how Attest uses a passkey to sign and to unlock your encryption key, and recovery.
- [Why a passkey signature beats an email link](https://attest.datahubz.com/guides/passkey-signature-vs-email-link.md): Email-link signing and passkey signing compared situation by situation: a forwarded email, a lookalike page, a signer who denies signing, an edited document, proof without the vendor and a hijacked mailbox.
- [End-to-end encryption for documents, explained](https://attest.datahubz.com/guides/end-to-end-encryption-explained.md): End-to-end encryption explained for business owners: the lockbox idea, the keys involved, what changes compared with a vendor that holds the keys, the trade-offs, and five questions that test whether a vendor really offers it.
- [Will a signed document still verify in 20 years?](https://attest.datahubz.com/guides/signed-document-verify-in-20-years.md): Whether a signed PDF still verifies after 20 years: why certificate-based signatures need long-term validation, what lasts in an Attest signed copy (open formats, SHA-256, a public anchor, an open-source verifier inside the file) and what it still depends on.
- [How employers prove an employee signed](https://attest.datahubz.com/guides/employers-prove-employee-signed.md): How an employer proves that an employee signed an offer letter, policy acknowledgment or agreement: what a challenge tests, why evidence the employer controls alone is weaker, how Attest records each employee's own passkey signature, and the HR steps that make it hold.
- [How to prove the date a document was signed](https://attest.datahubz.com/guides/prove-date-document-signed.md): How to prove the date a document was signed: why typed dates and file metadata are weak, what makes a signing time strong, how timestamps and blockchain anchors are treated in law, and the three times Attest records for every signature.
- [Proof of existence: proving a file existed on a date](https://attest.datahubz.com/guides/proof-of-existence.md): Proof of existence explained: what fingerprints and blockchain anchors prove (and don't), common business uses, how to create an Attest receipt for a file without uploading it, how anyone checks it, and how the law treats electronic time stamps.
- [Can an e-signature company alter an audit trail?](https://attest.datahubz.com/guides/can-e-signature-company-alter-audit-trail.md): Whether an e-signature company could alter an audit trail: what vendors' seals and hashing protect, what they can't prove, the questions to ask any vendor, and how Attest's signatures, anchors and sealed copies make a later change detectable.
- [How to make sure every party signed the same version](https://attest.datahubz.com/guides/every-party-signed-same-version.md): How to make sure every party signs the same version of a contract: how mismatches happen, how a document fingerprint settles it, how Attest keeps every signer on one file, what to do if the document changes after someone signed, and how to confirm it afterward.
- [Is an audit trail enough proof on its own?](https://attest.datahubz.com/guides/is-audit-trail-enough-proof.md): Whether an e-signature audit trail is enough proof: how courts treat it (admissibility, authentication, weight), where a log alone falls short, the layers of evidence that make it hold, and how Attest's audit trail sits beside each signer's passkey signature and a public anchor.
- [Is a blockchain-anchored signature legally valid?](https://attest.datahubz.com/guides/blockchain-anchored-signature-legal.md): Whether a blockchain-anchored electronic signature is legally valid: why validity comes from e-signature law, what an anchor proves as evidence, how the US, Arizona, Vermont, the EU, the UK, Italy, Mexico, Canada and Brazil treat blockchain records, and where Attest fits.
- [Proving an agreement to a bank, landlord or investor](https://attest.datahubz.com/guides/prove-agreement-to-bank-landlord-investor.md): How to prove a signed agreement to a bank, landlord, investor or new employer with a zero-knowledge proof: what each one asks for, which proof to send, a message to adapt, what they see and when to send the document instead.
- [Keep an agreement confidential and prove it exists](https://attest.datahubz.com/guides/keep-agreement-confidential-prove-it-exists.md): How to keep a signed agreement confidential at every layer (document, Attest's records, certificate, blockchain, shared copies) and still prove it exists with a zero-knowledge proof that reveals only the signers named and the completion day.
- [Zero-knowledge proofs for business documents, explained](https://attest.datahubz.com/guides/zero-knowledge-proofs-explained.md): Zero-knowledge proofs explained for business readers: completeness, soundness and zero knowledge, circuits, public and private inputs, verification keys and Groth16, and exactly how Attest's agreement proofs work and are verified on zkVerify.
- [Proving a signing date to an auditor without the terms](https://attest.datahubz.com/guides/prove-signing-date-to-auditor.md): How to prove to an auditor when an agreement was signed, and by whom, without disclosing its terms: Share proof for the parties and the completion day, the certificate of completion PDF for exact signing times, and the signed copy only when the terms are tested.
- [Confidential deals: proving a partnership is in place](https://attest.datahubz.com/guides/prove-partnership-confidentially.md): How a business proves that a confidential partnership, supply, reseller or teaming agreement is signed, with a zero-knowledge proof naming both signers and the completion day, plus what to agree with the partner, sample clause wording and what to use when specific terms must be shown.

## How-to

- [How to sign documents](https://attest.datahubz.com/how-to.md): Step-by-step guides, each with a video tutorial.
- [How to sign a PDF on your iPhone, no app needed](https://attest.datahubz.com/how-to/sign-pdf-on-iphone.md): Step by step: sign a PDF on an iPhone in Safari with Face ID, either one you upload yourself or one sent to you through Attest, with no app and no printer.
- [How to send a document for signature](https://attest.datahubz.com/how-to/send-document-for-signature.md): Step by step: send a PDF for signature with Attest, from upload, signers, order and fields to unlocking it for new signers, tracking, reminders and the sealed signed copy.
- [How to sign a PDF on Android, no app needed](https://attest.datahubz.com/how-to/sign-pdf-on-android.md): Step by step: sign a PDF on an Android phone in Chrome with a passkey unlocked by your fingerprint, face or screen lock, with no app and no printer.
- [How to sign a PDF on a Mac](https://attest.datahubz.com/how-to/sign-pdf-on-mac.md): Step by step: sign a PDF on a Mac in Safari or Chrome with a passkey unlocked by Touch ID or your iPhone, and how that differs from a Preview signature.
- [How to sign a PDF on Windows](https://attest.datahubz.com/how-to/sign-pdf-on-windows.md): Step by step: sign a PDF on a Windows PC in Edge or Chrome with a passkey unlocked by Windows Hello or your phone, and where Windows saves that passkey.
- [How to sign with Face ID, Touch ID or Windows Hello](https://attest.datahubz.com/how-to/sign-with-face-id-touch-id-windows-hello.md): How to sign documents with Face ID, Touch ID, Windows Hello or a device PIN: the one-time passkey setup, what each prompt does, other devices, and what to do when a prompt fails.
- [How to collect signatures in a set order](https://attest.datahubz.com/how-to/collect-signatures-in-order.md): Step by step: send one document to several signers who sign one at a time in the order you set, with each turn, how new signers get the document, reminders and the final sealed copy explained.
- [How to get a signature from someone with no account](https://attest.datahubz.com/how-to/get-document-signed-without-account.md): Step by step for senders: get a document signed by someone with no Attest account, what they see from the email to the signed copy, and how they get the document: Ready now or Private from the start.
- [How to add signature, initials and date fields to a PDF](https://attest.datahubz.com/how-to/add-signature-fields-to-pdf.md): Step by step: place signature, initials, date, full name and text fields on a PDF for each signer in Attest, what signers see, and why the entries can't be changed after signing.
- [How to send signing reminders and set an expiry date](https://attest.datahubz.com/how-to/signing-reminders-and-expiry.md): Step by step: set automatic signing reminders and an expiry date in Attest, how reminders are timed and capped, reminding by hand, and what happens when a document expires.
- [How to sign a document sent to you and send it back](https://attest.datahubz.com/how-to/sign-document-sent-to-you.md): Step by step: sign a document sent to you through Attest with a passkey, or sign a PDF that arrived as an attachment and send back a signed copy anyone can verify.
- [How to download the signed copy and its certificate](https://attest.datahubz.com/how-to/download-signed-copy-and-certificate.md): Step by step: download an Attest signed copy, the signed pages only, the certificate of completion PDF and the signature evidence, what each file holds and which one to keep or share.
- [How to verify a signed document, step by step](https://attest.datahubz.com/how-to/verify-signed-document-step-by-step.md): Step by step: verify an Attest signed PDF with the open verifier, read each check and what a failure means, check the file online, and open the live certificate from a stamp's code.
- [How to share proof that you signed](https://attest.datahubz.com/how-to/share-proof-you-signed.md): Step by step: create a zero-knowledge proof that you signed an agreement with Attest's Share proof, send its link, and what the recipient sees and checks, free and without the document.

## Use cases

- [E-signature use cases](https://attest.datahubz.com/use-cases.md): How different people and teams use Attest for their agreements.
- [E-signatures for freelancers and consultants](https://attest.datahubz.com/use-cases/freelancers-and-consultants.md): How freelancers and consultants use Attest for contracts, statements of work and change orders: proof for scope and payment disputes, private rates, and the price.
- [How to sign an NDA you can prove](https://attest.datahubz.com/use-cases/nda.md): How to sign a nondisclosure agreement privately with Attest, keep its certificate private, and prove it was signed without sharing it.
- [How to sign client contracts and statements of work](https://attest.datahubz.com/use-cases/client-contracts-and-statements-of-work.md): How service businesses sign master agreements, statements of work and change orders with Attest: linking each SOW to its contract, client signers in order, proof of the version signed, private client information, and the price.
- [E-signatures for agencies: contracts and change orders](https://attest.datahubz.com/use-cases/agencies.md): How marketing, creative and development agencies use Attest for retainers, statements of work, change orders, creative sign-offs and freelancer agreements, with private client work and team pricing.
- [How contractors get estimates and change orders signed](https://attest.datahubz.com/use-cases/contractors.md): How contractors and trades use Attest to get estimates, job contracts, change orders and completion sign-offs signed on the client's phone, with proof for payment disputes and the price.
- [E-signatures for landlords: leases and renewals](https://attest.datahubz.com/use-cases/landlords-and-property-managers.md): How landlords and property managers use Attest for leases, renewals, addenda and move-in and move-out condition reports: proof for deposit disputes, signing order, privacy, lease formalities by country, and the price.
- [How to sign offer letters and employment agreements](https://attest.datahubz.com/use-cases/offer-letters-and-employment-agreements.md): How employers use Attest for offer letters, employment agreements and confidentiality agreements: private salaries, deadlines, countersigning, proof when terms are questioned, country rules, and the price.
- [How to sign a roommate agreement online](https://attest.datahubz.com/use-cases/roommate-agreements.md): How roommates write and sign a roommate agreement with Attest: what to put in it, how everyone signs on their phone, keeping it private, updating it when someone moves, and why the 2 free documents, in total, cover it.
- [How to collect handbook and policy acknowledgments](https://attest.datahubz.com/use-cases/policy-acknowledgments.md): How employers collect signed acknowledgments of handbooks and policies with Attest: building the acknowledgment into the PDF, one document per employee, proof of the version each person signed, rollouts and updates, and the price.
- [E-signatures for vendor and supplier agreements](https://attest.datahubz.com/use-cases/vendor-and-supplier-agreements.md): How small businesses and procurement teams sign supply agreements, purchase contracts, amendments and renewals with Attest: proof of the exact version, private prices, signing order, and sealed bids on Pro.
- [E-signatures for sales quotes and order forms](https://attest.datahubz.com/use-cases/sales-quotes-and-order-forms.md): How sales teams and small businesses get quotes and order forms signed with Attest: expiry dates, reminders, countersignature, private pricing and proof of the exact terms the customer accepted.
- [Startups: SAFE notes, term sheets and board consents](https://attest.datahubz.com/use-cases/startups.md): How startups sign SAFEs, term sheets, board consents and stockholder consents with Attest: Delaware's written consent rules, private financing terms, one document per investor, and copies that prove themselves in diligence.
- [E-signatures for partnership agreements](https://attest.datahubz.com/use-cases/partnership-agreements.md): How business partners and partner companies sign partnership agreements, operating agreements and amendments with Attest: every partner on the same version, private terms, and proof of the partnership without disclosure.
- [Bill of sale for a car or equipment, signed online](https://attest.datahubz.com/use-cases/bill-of-sale.md): How a buyer and a seller sign a bill of sale for a car, boat, trailer or equipment with Attest, what a bill of sale records, and what a state's title transfer still requires.
- [How to sign a personal loan agreement online](https://attest.datahubz.com/use-cases/personal-loan-agreements.md): How friends and family sign a personal loan agreement with Attest: what to put in it, how to sign it, the US tax and interest rate rules to check, and a signed release when it's repaid.
- [Photo and model releases, signed on a phone](https://attest.datahubz.com/use-cases/photo-and-model-releases.md): How photographers, studios and businesses get photo and model releases signed with Attest: what a release covers, parents and guardians for minors, signing at the shoot, and keeping releases private.
- [Nonprofits: volunteer and grant agreements](https://attest.datahubz.com/use-cases/nonprofits.md): How nonprofits use Attest for volunteer agreements, grant agreements, MOUs and sponsorships: free for every signer, private documents, proof for funders and auditors, and plans for small and larger teams.
- [Schools and tutoring: enrollment and permission forms](https://attest.datahubz.com/use-cases/schools-and-tutoring.md): How tutoring centers, schools and camps use Attest for enrollment agreements and parent permission forms: parents or guardians sign on their phones, one private form per family, deadlines, and proof for both sides.

## Legal

- [Electronic signature laws](https://attest.datahubz.com/legal.md): Electronic signature law by country, with links to the statutes.
- [Are electronic signatures legally binding?](https://attest.datahubz.com/legal/are-electronic-signatures-legally-binding.md): The global guide to whether electronic signatures are legally binding: the shared rule, the main laws by country, the EU tiers, documents with special rules and what makes a signature strong evidence.
- [Electronic vs digital signatures: the difference](https://attest.datahubz.com/legal/electronic-vs-digital-signatures.md): The difference between electronic signatures (a legal concept) and digital signatures (a cryptographic technique), how the EU's simple, advanced and qualified tiers relate to them, and where Attest's passkey signatures fit.
- [Is a typed name a legal signature?](https://attest.datahubz.com/legal/is-a-typed-name-a-legal-signature.md): Whether a typed name is a legal signature under US, EU, UK and other laws, why intent is the test, why a typed name alone is weak evidence of who signed, and how a passkey approval adds that evidence.
- [Electronic signatures in the United States](https://attest.datahubz.com/legal/electronic-signatures-united-states.md): US electronic signature law: the ESIGN Act (15 U.S.C. 7001 and following), UETA in the states, New York's ESRA, ESIGN's consumer consent rules, excluded documents, evidence, and how Attest fits ordinary business agreements.
- [Electronic signatures in the European Union (eIDAS)](https://attest.datahubz.com/legal/electronic-signatures-european-union.md): EU electronic signature law: the eIDAS Regulation (EU) No 910/2014 as amended in 2024, its simple, advanced and qualified tiers, the national form rules it leaves in place, the e-Commerce Directive's permitted exclusions, evidence, and where Attest fits.
- [Electronic signatures in the United Kingdom](https://attest.datahubz.com/legal/electronic-signatures-united-kingdom.md): UK electronic signature law: the Electronic Communications Act 2000 s 7, UK eIDAS Article 25, the Law Commission's 2019 statement of the law, the intent test and case law, deeds, company execution, wills, lasting powers of attorney, HM Land Registry, Scotland, evidence, and where Attest fits.
- [Electronic signatures in Canada](https://attest.datahubz.com/legal/electronic-signatures-canada.md): Canadian electronic signature law: the Ontario, British Columbia and Alberta electronic commerce and transactions acts, Quebec's IT framework act and Civil Code, PIPEDA Part 2 and the federal secure electronic signature, excluded documents, the Canada Evidence Act, and where Attest fits.
- [Electronic signatures in Australia](https://attest.datahubz.com/legal/electronic-signatures-australia.md): Australian electronic signature law: the Electronic Transactions Act 1999 (Cth) and the Victorian and NSW Acts, the section 10 signature test and consent, the Corporations Act's signing rules for companies, deeds, excluded documents, evidence, and where Attest fits.
- [Electronic signatures in Ireland](https://attest.datahubz.com/legal/electronic-signatures-ireland.md): Irish electronic signature law: the Electronic Commerce Act 2000 and the eIDAS Regulation, the section 13 consent rule, the section 10 exclusions and the 2022 extension to registered land, deeds, witnessing and seals, admissibility and business records, and where Attest fits.
- [Electronic signatures in India](https://attest.datahubz.com/legal/electronic-signatures-india.md): Indian electronic signature law: the Information Technology Act, 2000 (ss 3, 3A, 5, 10A, the First and Second Schedules), eSign and Digital Signature Certificates from licensed Certifying Authorities, the Bharatiya Sakshya Adhiniyam, 2023 on electronic evidence, and what Attest signatures can and can't be used for in India.
- [Electronic signatures in Singapore](https://attest.datahubz.com/legal/electronic-signatures-singapore.md): Singapore electronic signature law: the Electronic Transactions Act 2010 (ss 2, 5, 6, 8, 11, 17 to 19 and the First to Third Schedules), secure electronic signatures and digital signatures, excluded matters, Evidence Act presumptions, and where Attest fits.
- [Electronic signatures in South Africa](https://attest.datahubz.com/legal/electronic-signatures-south-africa.md): South African electronic signature law: the ECT Act 25 of 2002, electronic and advanced electronic signatures, the Spring Forest judgment (SCA, 2014), the Schedule 2 exclusions, evidential weight under section 15, and how Attest fits ordinary business agreements.
- [Electronic signatures in Spain](https://attest.datahubz.com/legal/electronic-signatures-spain.md): Spanish electronic signature law: eIDAS (Regulation 910/2014), Ley 6/2020 on trust services, the LSSI (Ley 34/2002), the burden of proof under LEC article 326, the Código Civil's public-document rules, remote notarial acts, and how Attest fits ordinary business agreements.
- [Electronic signatures in Mexico](https://attest.datahubz.com/legal/electronic-signatures-mexico.md): Mexican electronic signature law: the Código de Comercio (articles 89 to 114), the Código Civil Federal, Firma Electrónica and Firma Electrónica Avanzada o Fiable, the e.firma, NOM-151-SCFI-2016 conservation, blockchain evidence under the CNPCF, notarial acts, and how Attest fits ordinary business agreements.
- [Electronic signatures in Colombia](https://attest.datahubz.com/legal/electronic-signatures-colombia.md): Colombian electronic signature law: Ley 527 de 1999, its regulation in Decreto 1074 de 2015 (which incorporated Decreto 2364 de 2012), firma electrónica and firma digital, the presumption for agreed methods, evidence under Ley 527 and the Código General del Proceso, public deeds, and how Attest fits ordinary business agreements.
- [Electronic signatures in Argentina](https://attest.datahubz.com/legal/electronic-signatures-argentina.md): Argentine electronic signature law: Ley 25.506 de Firma Digital (as amended by Ley 27.446), Decreto 182/2019, firma electrónica and firma digital, the burden of proof under article 5, the Código Civil y Comercial on form, signature and evidence, public deeds and wills, and how Attest fits ordinary business agreements.
- [Electronic signatures in Chile](https://attest.datahubz.com/legal/electronic-signatures-chile.md): Chilean electronic signature law: Ley 19.799 and its regulation (Decreto 181 de 2002), firma electrónica and firma electrónica avanzada, the article 3 exclusions, evidence under article 5 and the Código de Procedimiento Civil, public deeds and wills, the pending 2026 reform bill, and how Attest fits ordinary business agreements.
- [Electronic signatures in Brazil](https://attest.datahubz.com/legal/electronic-signatures-brazil.md): Brazilian electronic signature law: MP 2.200-2/2001 and ICP-Brasil, Lei 14.063/2020 (simple, advanced and qualified signatures), the STJ's REsp 2.159.442, proof under the CPC, real estate, e-Notariado, registries, witnesses on enforcement titles, and how Attest fits ordinary business agreements.

## Languages

The homepage and the document signing page are also published in Spanish and Brazilian Portuguese, with the same facts. The app and its emails, the signing page signers open, the signed copy, the verifier, the rest of the site, the tutorials and the films are in English.

- [Home, in Spanish (Español)](https://attest.datahubz.com/es.md): The homepage in Spanish: what Attest is, what signers see, why sign with Attest, the plans and prices, and every Attest tool.
- [Document signing, in Spanish (Español)](https://attest.datahubz.com/es/sign.md): Document signing in Spanish: how signing works, what you can check yourself, the sealed copy, prices, legal validity and common questions.
- [Home, in Brazilian Portuguese (Português)](https://attest.datahubz.com/pt-br.md): The homepage in Brazilian Portuguese: what Attest is, what signers see, why sign with Attest, the plans and prices, and every Attest tool.
- [Document signing, in Brazilian Portuguese (Português)](https://attest.datahubz.com/pt-br/sign.md): Document signing in Brazilian Portuguese: how signing works, what you can check yourself, the sealed copy, prices, legal validity and common questions.

## Optional

- [Full documentation in one file](https://attest.datahubz.com/llms-full.txt): every page above, in Markdown, in one file.
- [Open-source verifier](https://github.com/DataHubz/attest-verifier): the MIT-licensed verifier that checks Attest records without Attest.
- [TypeScript SDK](https://attest.datahubz.com/sdk/attest.ts): the Integrations client for platforms, as one TypeScript file.
- [DataHubz](https://www.datahubz.com): the company behind Attest, the Hubz compliance platform and Rubro security assessments.