Out of the box, we authenticate using email links, which is not the strongest method but sufficient for most cases and legally recognized.
You can also bring your own identity verification provider (eg ID card comparison with live video, biometrics, HSM token, etc) and integrate that verification into the signing process. Our API is flexible enough to support this.
It seems like a path that a tech savvy company could excel in: document/ID photos, voice or video confirmations, recorded interviews..