top of page

What is Blockchain?

Blockchain is a system of recording information that makes it essentially impossible to change, hack, or cheat the system. This is a digital ledger that is duplicated and distributed across the entire network of computer systems on the blockchain.

It’s secure and immutable—unable to be changed.

How does it work?

TEFL Graduates receive a simple, secure, lifelong link that can be shared directly with schools, recruiters or anyone who needs to review verified credentials. You can also share your digital award on your LinkedIn, Facebook, Twitter or other media platform.

By clicking on this link, certified data can be read in real-time on the Ethereum blockchain-based Polygon chain.

You can also download your certificate in PDF format from the link sent to you. This printable version will also have a QR code that can be scanned where it will take you to the verification page to validate your TEFL certificate.

Upon verification, you can access the information that contains TEFL International's (issuer) blockchain public key and the transaction ID. With this privilege, you can also share your digital award on LinkedIn, Facebook, and Twitter.

The best of both worlds! 

You can also download your certificate in PDF format from the link sent to you. 


This printable version can be sent to a prospective employer as an email attachment or it can be presented in person.

Your TEFL Certificate will also include a QR code that can be scanned where it will take you to a secure online verification page where anyone can ascertain its validity.

Benefits of Using Blockchain to Issue Credentials

FSU Certification
Blockchain Image.png
  • When an award is issued on a blockchain, it can be verified instantly, by clicking on the verification link or scanning a QR code.


  • Differentiate yourself by presenting a TEFL Certificate that any prospective employer can instantly validate.


  • Traditional records are usually held as paper files that can deteriorate over time. By storing the records as digital awards on a blockchain, the issuer can safeguard them from damage. loss or destruction. You can always print another copy of your certificate!

  • Tackling fake certificates using blockchain technology. Blockchain secures them and ensures that they cannot be forged or modified.


  • Digital awards can be shared an unlimited number of times in all formats: social and professional networks (LinkedIn, Twitter, etc.)

  • By embracing blockchain technology, Vantage can ensure that our awards remain immutable and instantly verifiable from anywhere in the world.

Take a Test Drive—A Blockchain Example

Block chain Certificate Sample2.jpg

How  to Verify Your Certificate

There are two easy ways that you can go to verify your certificate using Certif-ID.

1.) Simply scan the QR code at the bottom of your certificate or, 

2.) You can copy and paste your personal life-long URL.  Try it with this example. Here's the URL for the certificate shown above:

Academic Transcript (click image for details)

You will be also issued an Academic Transcript that shows you have earned three (3) university credit hours at the undergraduate level.

Academic Transcript 2.jpg
Independently Awarded Best TEFL Course Worldwide
Winner 2019 Community Choice Awards
Vantage—2020 Global TEFL Award Winner
Vantage is Best TEFL--Instruction 2021
iTTT Partnership
Jan FB Posting.png
  • Facebook Social Icon
  • Vantage TEFL Twitter
  • Vantage Siam’s YouTube Channel
  • Vantage Siam Linkedin
  • Vantage Siam’s “World of Mouth” Blog

© 2007-2016 by Vantage Siam Co., Ltd. 


1873/15-16 Sena Center, Phaholyothin Rd,

Ladyao, Chatuchak, Bangkok 10900

Vantage TEFL Certification

Tel: 02-511-3516

Fax: 02-511-3515

bottom of page