The Blockchain is, in simple terms, a database distributed in a multitude of computers that collaborate together in the Internet space.
An Institution and an Individual agree to register any certification in the database, and sign and encrypt it using cryptographic techniques. Then, the student may address any other institution and share his certificate, whose veracity can be checked directly in the Blockchain without having to contact again with the Institution that issued it.
The Blockchain design means that there are many copies of the database on the Internet, all of them necessary and absolutely identical. This makes fraud impossible, and also guarantees the survival of the certificates issued by the educational institution, even in the event that the institution disappears. The certificates thus registered are perennial and immutable.
The educational institution issues a normal paper certificate (if desired) and communicates it to BlockTac through a private channel. It is your only commitment.
BlockTac notifies the student and facilitates an Android or iOS application to view his certificate.
The student can share from the application his certificate with whomever he wishes and any person or institution can verify the certificate without having to contact the accrediting institution.