See https://support.esign-app.com for eSign Documentation and Support
eSign 2019 Launch
1. Launch Features
Execute Signatures to Issues
Generate Signature Certificates
Certify issue unmodified after signing via Certificates
Users can now set their own Signature Pin from the User Profile - eSign Settings page.
User (with Project Admin privileges) can reset/clear all signatures.
Supports adding Signatures via the Quick Add button in the Jira New Issue View.
Support for legacy and new issue view in Jira