The SMS OTP signature is based on a one-time-password code, generated from the hash of the document to be signed, and sent to the signer’s cell phone via SMS. The verification code generated by Viafirma corresponds to a random algorithm for which the content of the document to be signed (hash) is used, being able to prove that this OTP code corresponds to a specific document and not to another one.
An example configuration for this type of evidence could be:
![](https://www.viafirma.com/wp-content/uploads/2020/05/otp_sms_detail.png)
During the signing process, the signer will be shown as follows:
This is the SMS you will receive to tell you the code to enter:
![](https://www.viafirma.com/wp-content/uploads/2020/05/otp_sms_mobiletext-300x237.png)
Once the signature has been made, the result will be as follows.
Document where the evidence is shown:
![](https://www.viafirma.com/wp-content/uploads/2020/05/documento_firma_sms-1024x516.jpg)
Data collected during the signature and that can be seen from the document itself if in the evidence we activate the option “Add public link on the evidence”:
![](https://www.viafirma.com/wp-content/uploads/2020/05/enlace-publico-evidencia-1-260x300.png)
This information will be available at all times from the platform.
As a summary and to see how the configuration would affect the signature process, let’s see the following image:
![](https://www.viafirma.com/wp-content/uploads/2020/05/otp_sms_sample_desc-768x574.png)
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