--- title: "Attest vs Mifiel · Attest" description: "Attest vs Mifiel (Mexico) on end-to-end encryption, e.firma, NOM-151, verification and price in pesos, with Mifiel's packages as published October 12, 2026." url: https://attest.datahubz.com/compare/attest-vs-mifiel updated: 2026-10-12 --- [Attest](https://attest.datahubz.com/)/[Compare](https://attest.datahubz.com/compare) # Attest vs Mifiel Attest is the better choice for confidential agreements that an electronic signature can cover: it end-to-end encrypts every document for every signer by default, with no special certificate, each signer signs with a passkey only they control, and 20 documents cost $5 a month (about MXN 92 at the DOF rate of October 12, 2026). Mifiel is the better choice for signing with the SAT e.firma, for a NOM-151 conservation certificate on every document or for electronic promissory notes, with prepaid credits from MXN 890 for 10 documents, IVA included, as published on October 12, 2026. By DataHubz · Updated October 12, 2026 · 8 min read ## Mifiel and Attest at a glance Mifiel, whose terms give its domicile as Jalisco, Mexico, is built around Mexico's legal infrastructure: the SAT e.firma, NOM-151 conservation certificates and electronic promissory notes. Mifiel's prices are as published on its pricing page on October 12, 2026; its other details are as published on its own pages on October 11, 2026. | | Attest | Mifiel (as published October 12, 2026) | | --------------------------------- | -------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | Encryption | End to end: every document, for every signer, on every plan | Ordinary documents: "cifrado en tránsito y reposo" (encryption in transit and at rest), per its privacy notice. End to end only in a paid "proceso de firma privado" (private signing process), when every signer holds a valid e.firma | | How a signer signs | A passkey only they control (Face ID, Touch ID, Windows Hello or the device PIN) | The SAT e.firma, or without it, a simple signature backed by a selfie with liveness check matched to an INE or passport | | The legal evidence | The sealed PDF, carrying the full evidence and an open-source verifier | An XML file; Mifiel says its PDF "no tiene validez legal" (has no legal validity) | | Time and conservation | Each agreement anchored on the Horizen public blockchain | A NOM-151 conservation certificate from an accredited provider on every document | | Who can verify | Anyone, free, with the verifier inside the file, even if Attest is gone | Anyone, with Mifiel's verifier, "una herramienta de código abierto" (an open-source tool) | | Prove a fact without the document | Yes: a zero-knowledge proof that you signed, and the date it was completed | Not offered | | Free | 2 documents, in total | A 5-document trial package | | Price | $5 a month for 20 documents, month to month | Prepaid credits: MXN 890 for 10 documents, down to MXN 12 each in 5,000-document packages; credits don't expire | ## Electronic signatures under Mexican law, in brief This is general information, not legal advice. Under the [Código de Comercio](https://www.diputados.gob.mx/LeyesBiblio/pdf/CCom.pdf), an electronic signature (Firma Electrónica) "produce los mismos efectos jurídicos que la firma autógrafa, siendo admisible como prueba en juicio" (has the same legal effects as a handwritten signature and is admissible as evidence) (art. 89), as long as it is appropriate for its purpose (art. 97), and courts weigh the reliability of the method used (art. 1298-A). Article 97 also sets the tests for an advanced or reliable signature, and a certificate such as the e.firma is the strongest way to show they are met. Two rules matter when you choose a tool: 1. **Conservation.** Merchants must keep contracts, including data messages, for at least ten years ([Código de Comercio](https://www.diputados.gob.mx/LeyesBiblio/pdf/CCom.pdf), art. 49), following the requirements of [NOM-151-SCFI-2016](https://dof.gob.mx/nota%5Fdetalle.php?codigo=5478024&fecha=30/03/2017). Conservation is shown with a "constancia de conservación" from a certification service provider accredited by the Secretaría de Economía: an RFC 3161 time stamp over the document's fingerprint. 2. **Blockchain evidence.** Under the new national civil procedure code ([CNPCF](https://www.diputados.gob.mx/LeyesBiblio/pdf/CNPCF.pdf), art. 350), in force everywhere by April 1, 2027 at the latest, information stored in a public blockchain is full proof unless there is reliable evidence that the records were breached or tampered with, or aren't reliable. That covers the anchored data, not who signed, and whether courts apply it to an anchor like Attest's is untested. An Attest signature is a Firma Electrónica. A merchant keeping the contract under article 49 can request a NOM-151 constancia for the signed copy from an accredited provider, which receives only the file's fingerprint, so the document stays private; Mifiel includes a constancia with every document. Tax filings generally use the SAT's e.firma (Código Fiscal de la Federación, art. 17-D), dealings with the federal public administration use an advanced electronic signature ([Ley de Firma Electrónica Avanzada](https://www.diputados.gob.mx/LeyesBiblio/pdf/LFEA.pdf)), and real estate deeds above the legal threshold, public wills and many powers of attorney need a notary or a ratified signature. ## Privacy: two approaches to end-to-end encryption Mifiel is the one other service among the 21 we compared that describes encryption that keeps it out of documents. Its private signing process encrypts the document "en tu navegador con las llaves públicas de las e.firmas de los firmantes" (in your browser with the public keys of the signers' e.firmas), and "ningún tercero, incluyendo Mifiel, puede descifrarlo" (no third party, including Mifiel, can decrypt it). It is a separately contracted add-on, an encrypted vault "disponible para contratación", and it works only when every party has a valid e.firma: "Si alguna de las partes no cuenta con una e.firma, o esta se encuentra revocada o expirada, no podrás agregarla como firmante". For ordinary documents, Mifiel's privacy notice describes "cifrado en tránsito y reposo" (encryption in transit and at rest), with no mechanism that keeps Mifiel out; only the private process does. Attest applies the same principle to every document, on every plan, Free included. Each document is encrypted in the sender's browser with AES-256-GCM, and its key is locked separately to each party's own key; signers need no special certificate, because each one sets up a passkey from their signing link. Attest stores your document only as ciphertext it can't read. We compared 21 e-signature services in October 2026, Attest and 20 others, and [Attest was the only one](https://attest.datahubz.com/compare/which-e-signature-services-can-read-your-documents) that end-to-end encrypts every document, for every signer, by default. ## How signers sign Mifiel signers need no account: "El único que requiere una cuenta es el creador del documento" (only the document's creator needs an account). With an e.firma, the signer uses their .cer and .key files and password, and Mifiel says signing runs in the browser and the .key and password are never uploaded. Signers without an e.firma sign with a selfie and liveness check matched to an INE or passport photo, and "se cobrará un crédito por cada intento de verificación de identidad": each verification attempt uses a credit, failed ones included. On Attest, every signer approves with a **passkey**: a cryptographic key only the signer controls, unlocked with Face ID, Touch ID, Windows Hello or the device PIN. The passkey signs a statement naming the exact document, by its fingerprint, and everything the signer entered. It works in the browser on a phone or a computer, in Mexico or anywhere else, at no cost to the signer. ## Evidence and verification Mifiel's legal evidence is an XML file holding the original document, its fingerprint, each signer's certificate data and signature, and the NOM-151 constancia; the PDF is a visual copy. Its verifier is "una herramienta de código abierto" that checks the fingerprint, the certificate chain, each signature and the NOM-151 certificate, "exclusivamente" for documents signed in Mifiel. Mifiel also uses Blockstream's Liquid sidechain for electronic promissory notes. On Attest, the PDF everyone receives is the evidence: the signed pages, with a "Signed with Attest" stamp on each 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, the original document and a standalone verifier attached inside. The verifier is open source under the MIT license; drop the PDF on it in any browser and it checks each signer's passkey signature, the original document, Attest's anchored record on Horizen and the pages you see, even if Attest no longer exists. Each signer can also share a zero-knowledge proof that they signed, and the date the agreement was completed, verified on zkVerify, without revealing the document. ## Price in pesos Attest's price is in US dollars: at the exchange rate published in the Diario Oficial de la Federación for October 12, 2026 (18.4163 pesos per dollar), $5 is about MXN 92. Mifiel's prices include IVA. | | Attest | Mifiel (October 12, 2026) | | --------------------------- | ---------------------------- | ---------------------------------------------------------------------------- | | Free | 2 documents, in total | 5-document trial package | | 10 documents | $5, if sent within one month | MXN 890 (MXN 89 each) | | 20 a month for a year (240) | $60, about MXN 1,105 | A 500-document package: MXN 14,500 (MXN 29 each), with 260 credits left over | | Signers without an e.firma | Included | ID-verification credits, from MXN 1,093.88 for 50 | Mifiel's credits never expire, which suits occasional use. Attest's plan is month to month, and you can cancel any time. ## When Mifiel is the better fit - **You or your signers sign with the e.firma**, the advanced electronic signature backed by a SAT certificate. - **You want a NOM-151 conservation certificate on every document**, as a merchant keeping contracts for ten years. - **You issue electronic promissory notes** (pagarés) that can be endorsed. - **You sign occasionally** and prefer prepaid credits that never expire. - **You want a Mexican provider** with a Spanish-language product, an API with SDKs and a NOM-151-only API. ## Who should choose Attest - **Teams with confidential agreements** whose signers don't all have an e.firma, or who sign from other countries. - **Anyone who wants end-to-end encryption by default**, not as an add-on. - **Regular senders**: 20 documents a month for $5, about MXN 4.60 a document at the DOF rate of October 12, 2026. - **People who receive signed documents** and want to check them free, with no account. ## Starting on Attest Sign in with your email, set up your signing key with a passkey and a recovery phrase, upload a PDF of up to 8 MB, add your signers and place their fields. Your first 2 documents are free, in total. ## Questions people ask Does Mifiel end-to-end encrypt documents? Yes, in its private signing process, a separately contracted add-on that works only when every signer has a valid e.firma, as published on October 11, 2026; for ordinary documents, its privacy notice lists encryption in transit and at rest. Attest end-to-end encrypts every document, for every signer, on every plan, and signers need only a passkey. Is an Attest signature valid in Mexico? Mexico's Código de Comercio gives an electronic signature the same legal effects as a handwritten one and admits it as evidence (art. 89), if it is appropriate for its purpose (art. 97). Courts weigh how reliable the method is, which is where Attest's evidence counts. Tax filings and dealings with the federal government generally use the e.firma, and some acts need a notary; this is general information, not legal advice. Do I still need a NOM-151 certificate if I use Attest? If you are a merchant keeping the contract under the Código de Comercio's ten-year duty, yes: request a constancia for the signed copy from an accredited provider, which receives only the file's fingerprint, so the document stays private. Attest's anchor adds public evidence of when the agreement was completed and that it hasn't changed since. Mifiel includes a constancia with every document, as published on October 11, 2026. Which is cheaper? For regular use, Attest: 20 documents a month for $5, about MXN 92 at the DOF rate of October 12, 2026, or about MXN 4.60 a document. Mifiel's credits cost MXN 89 each in a 10-document package and MXN 29 each in a 500-document package, IVA included, as published on October 12, 2026, and they never expire. Can my signers use Attest without an e.firma? Yes. Each signer opens their link, sets up a passkey with Face ID, Touch ID, Windows Hello or the device PIN, and approves with it. They need no certificate, no account and no password, and they never pay. ## Sources 1. [Mifiel: precios](https://www.mifiel.com/es/pricing), Mifiel, read October 12, 2026 2. [Mifiel: paquetes de créditos](https://guia.mifiel.com/es/paquetes-creditos-mifiel), Mifiel, read October 11, 2026 3. [Mifiel: funcionalidades](https://www.mifiel.com/es/soluciones/funcionalidades-mifiel), Mifiel, read October 11, 2026 4. [Mifiel: ¿los firmantes deben registrarse?](https://guia.mifiel.com/firmantes-deben-registrarse-en-mifiel), Mifiel, read October 11, 2026 5. [Mifiel: firmar con e.firma o sin ella](https://guia.mifiel.com/es/firmar-en-mifiel-con-efirma-o-sin-ella), Mifiel, read October 11, 2026 6. [Mifiel: firma electrónica con biométricos](https://guia.mifiel.com/es/firma-electronica-biometricos), Mifiel, read October 11, 2026 7. [Mifiel blog: proceso de firma privado](https://blog.mifiel.com/proceso-de-firma-privado/), Mifiel, read October 11, 2026 8. [Mifiel: ¿cómo protege Mifiel mi e.firma?](https://guia.mifiel.com/es/c%C3%B3mo-protege-mifiel-mi-e.firma/fiel), Mifiel, read October 11, 2026 9. [Mifiel: ¿qué es el proceso de firma privado?](https://guia.mifiel.com/es/qu%C3%A9-es-el-proceso-de-firma-privado-de-documentos-encriptados), Mifiel, read October 11, 2026 10. [Mifiel: registro de certificados para el proceso de firma privado](https://guia.mifiel.com/es/registro-de-certificados-para-el-proceso-de-firma-privado), Mifiel, read October 11, 2026 11. [Mifiel: documento firmado, el PDF y el XML](https://guia.mifiel.com/es/documento-firmado-c%C3%B3mo-funcionan-el-pdf-y-el-xml-y-por-qu%C3%A9-dos-archivos), Mifiel, read October 11, 2026 12. [Mifiel: verificar una firma electrónica](https://guia.mifiel.com/es/verificar-firma-electr%C3%B3nica-es-valida), Mifiel, read October 11, 2026 13. [Mifiel: NOM-151](https://guia.mifiel.com/es/nom-151), Mifiel, read October 11, 2026 14. [Mifiel blog: pagaré electrónico](https://blog.mifiel.com/pagare-electronico-firma-digital/), Mifiel, read October 11, 2026 15. [Mifiel: ¿cuentan con API?](https://guia.mifiel.com/es/cuentan-con-api), Mifiel, read October 11, 2026 16. [Mifiel terms](https://www.mifiel.com/es/terms), Mifiel, read October 11, 2026 17. [Mifiel: aviso de privacidad (version 3.1, September 25, 2026)](https://www.mifiel.com/es/privacy), Mifiel, read October 12, 2026 18. [Tipo de cambio (DÓLAR), October 5 to 12, 2026](https://dof.gob.mx/indicadores%5Fdetalle.php?cod%5Ftipo%5Findicador=158&dfecha=05%2F10%2F2026&hfecha=12%2F10%2F2026), Diario Oficial de la Federación, read October 12, 2026 19. [Código de Comercio (last reform DOF 14-11-2025), arts. 49, 89, 97 and 1298-A](https://www.diputados.gob.mx/LeyesBiblio/pdf/CCom.pdf), Cámara de Diputados, read October 11, 2026 20. [NOM-151-SCFI-2016 (DOF 30-03-2017)](https://dof.gob.mx/nota%5Fdetalle.php?codigo=5478024&fecha=30/03/2017), Diario Oficial de la Federación, read October 11, 2026 21. [Código Nacional de Procedimientos Civiles y Familiares (last reform DOF 15-01-2026), arts. 348 to 350](https://www.diputados.gob.mx/LeyesBiblio/pdf/CNPCF.pdf), Cámara de Diputados, read October 11, 2026 22. [Código Fiscal de la Federación, art. 17-D (e.firma)](https://www.diputados.gob.mx/LeyesBiblio/pdf/CFF.pdf), Cámara de Diputados, read October 11, 2026 23. [Ley de Firma Electrónica Avanzada](https://www.diputados.gob.mx/LeyesBiblio/pdf/LFEA.pdf), Cámara de Diputados, read October 11, 2026 24. [Código Civil Federal, arts. 1511, 2320 and 2555](https://www.diputados.gob.mx/LeyesBiblio/pdf/CCF.pdf), Cámara de Diputados, read October 11, 2026 ## Read next - [Electronic signatures in Mexico](https://attest.datahubz.com/legal/electronic-signatures-mexico) Mexican e-signature law in plain language: the Código de Comercio, firma electrónica and FEA, NOM-151 conservation, notarial acts and proof in court. - [Which e-signature services can read your documents?](https://attest.datahubz.com/compare/which-e-signature-services-can-read-your-documents) What 21 e-signature services say about encryption, in their words, and which can decrypt your documents. Only Attest end-to-end encrypts them all by default. - [Is a blockchain-anchored signature legally valid?](https://attest.datahubz.com/guides/blockchain-anchored-signature-legal) How the law treats blockchain-anchored e-signatures: validity comes from e-signature law, the anchor is evidence, and a few laws name blockchain records. - [Document signing](https://attest.datahubz.com/sign) Electronic signatures with a passkey: no account or password for signers, documents encrypted in the browser, and a signed copy anyone can verify. --- Source: https://attest.datahubz.com/compare/attest-vs-mifiel