Multi-factor authentication method and system for web3 services

A system for multi-factor authenticating users in Web3 services, the system comprising a multi-factor authentication provider, which comprises a multi-factor authentication provider portal, in which an end-user creates an account by accessing the multi-factor authentication provider portal, the multi-factor authentication provider being configured to:

• validate that the end-user owns a public key in a blockchain which identifies the end-user in Web3;
• associate the created account with an identifier of a user terminal which is configured to receive off-chain data used for multi-factor authentication and coming from outside of the blockchain;
• authenticate the end-user in the multi-factor authentication provider portal by using the identifier of the user terminal;
• characterized in that the multi-factor authentication provider is further configured to:
• validate that the end-user owns the public key by associating the public key used as a first factor of the multi-factor authentication with the multi-factor authentication provider, and
• interact with a smart contract to perform the multi-factor authentication in an operation in the smart contract by using the off-chain data as one or more factors required, after the first factor, for the multi-factor authentication.