Seal
Multifactor Authentication via Digital Signature
Seal is a software cryptographic authenticator based on a digital signatures. In the app, that it integrated with, Seal accomplishes second factor authentication for users owned element (something you have) by asymmetric cryptography methods.
It guarantees that the transaction is made or approved through users authorized device that previously registered in Seal system. It’s a solution that it includes SDK’s for a both Android and iOS platforms alongside with backend server apps that SDK’s will be communicate with.