# Useful Links

* Trust1Team Validation Web Application: <https://validation.t1t.be/>
* Trust1Gateway Marketplace: <https://accmkt.t1t.be/>
* Example of an implementation: <https://github.com/Trust1Team/vwapp/>
* Document used in this guide: [https://t1t.gitbooks.io/tutorial-pdf-digital-signature-validation/content/assets/Trust1Team.pdf](https://www.gitbook.com/book/t1t/tutorial-pdf-digital-signature-validation/edit)