It's just a ERC20 Token for the project
The validator smart contract. An owner becomes a validator.
A service smart contract that holds the map of recipient => amount of tokens.
The issuer node calls issueCertificate() function and passes the liability address, the address of token and the amount of tokens.
The next step is call claimCertificate() function by the recipient and pass the address of the liability.
Note! In order to claim certificates, a validator has to approve the result message
The Emitter contract uses a white list of addresses which are able to call the issueCertificate() function, so you should specify those addresses in migrations/2_contracts_deploy.js