COMPUTER-IMPLEMENTED SYSTEM AND METHOD PROVIDING A DECENTRALISED PROTOCOL FOR THE RECOVERY OF CRYPTOGRAPHIC ASSETS

摘要

A computer-implemented method is described for enabling recovery of one or more digital assets held on a blockchain by a user under a public key Pk after a corresponding private key Sk for accessing the one or more digital assets is lost. The computer implemented method comprises setting access for the one or more digital assets held on the blockchain under the public key Pk and accessible using the corresponding private key Sk of the user such that the one or more digital assets are also accessible using a private key x shared by a congress on the blockchain network, the congress comprising a group of users on the blockchain network, each member of the congress having a private key share xi, the private key share xi to be used in a threshold signature scheme in which at least a threshold of private key shares must be used to generate a valid signature through the combination of partial signatures of the congress to access the one or more digital assets on behalf of the user. If the private key Sk is lost then the congress can be notified to access the one or more digital assets on behalf of the user, the user proving their identity to the congress by providing a recovery password.