If you’d like to enable attestations for your account, please contact support.

SignatureAPI is legally binding and compliant with U.S. e-signature regulations (ESIGN & UETA), the European eIDAS regulation (at the SES level), and similar electronic signature laws around the world.

However, some countries have specific legal requirements for electronic signatures. SignatureAPI can meet these additional requirements when necessary. To enable this, set the attestation property of the Envelope to a supported attestation type (currently, only mx_nom151 for Mexico’s NOM-151 standard is available).

​
Mexico NOM-151

NOM-151 (Norma Oficial Mexicana 151) defines the legal standards for data message preservation and document digitization in Mexico. It ensures the authenticity and security of electronic documents and governs how physical documents are digitized.

When an envelope includes this attestation type, a preservation certificate in ASN.1 format is attached to its deliverable. This file, along with the deliverable, can be verified using any ASN.1 signature verification tool. SignatureAPI also provides a verification link on the last page of the deliverable.

To attest your envelopes with NOM-151, set the attestation property of the envelope to mx_nom151:

// POST /v1/envelopes
{
    "title": "Contrato",
    "recipients": [
        //...
    ],
    "documents": [
        //...
    ],
    "attestation": "mx_nom151"
}

Using NOM-151 attestation adds a small fee of $0.10 per completed envelope.