A method and system for digital authentication is disclosed, in which an owner device associated with a smart lock receives identity information of a user device requesting access to the smart lock. The owner device registers first contract information of the smart contract, for granting access of the smart lock to the user device, on a decentralized trust network, and sends second contract information about the smart contract to the user device. The second contract information comprises validation information of the smart contract indicating an un-validated information of the second contract information. The user device validates the received second contract information against the first contract information on the decentralized trust network, and authenticates the user device with the smart lock using the validated second contract information.