Methods and systems for providing a voice-based digital signature service are disclosed. The method includes a first user sending a document to a second user for signature, and the first user also sending a PIN to the second user and to a voice verification authority. The second user sending, to the voice verification authority, a voice recording comprising the PIN along with consent of the second user to the PIN. The voice verification authority comparing the voice recording with a predefined voice sample of the second user, and the PIN received from the first user with the PIN received from the second user. The voice verification authority then sending a notification to a signing entity based on the comparison. The signing entity signing the PIN of the document with a private key associated with the second user and sends an acknowledgement to the first user and the second user.