Abstract: The present disclosure relates to a method for secure, traceable and privacy-preserving with anonymity revocation digital currency transfer to at least a first user from a second user among a plurality of banked and unbanked users by using a distributed ledger comprising a plurality of ledger nodes, wherein said users perform Digital Currency transfers by adding transactions on this ledger using user devices configured to be connected to said nodes, to a registration authority and to a revocation authority, said authorities owning each one a public/private key pair, comprising: an enrollment phase, performed by a user device of said first user, comprising: sending to the registration authority evidence of the first user's identity, generating a first user identification key pair comprising a first user identification public key and a first user identification secret key, sending to the registration authority said generated first user identification public key, receiving from the registration authority a si

Abstract: The invention relates to a system (1) for issuing electonic money, transfering said money from an e-Money sender (30) to an e-Money receiver (40) and compensating said money, said system comprising an issuer (10) or e-Money Issuer for issuing said electonic money, characterized in that it comprises at least one regulated entity (60), so that the issuance of the electonic money is regulated, and the transfer and subsequent usage or misuse of the e-money is monitored.

Abstract: A method is intended for authenticating a user of a contactless chip card by means of a contactless card reader. This method comprises the steps of: (i) using this contactless card reader for acquiring a first image of at least a part of the user hand that holds the card when it is presented to this contactless card reader, (ii) comparing this first image with a second image stored into this contactless chip card, this second image defining a reference image of at least this part of the user hand when it holds the contactless chip card, to determine if this first image is similar to this second image, and (iii) authenticating this user if this first image is effectively similar to this second image.