Abstract: A method for delegating access to a blockchain. The method is carried out by an access delegation device and includes: receiving an execution request from a terminal, including at least one identifier of a user and at least one command to execute an action within the blockchain, the command being encrypted via at least one encryption key belonging to the user; obtaining, according to the at least one identifier of the received user, at least one decryption key of the user for decrypting the execution command; decrypting the execution command; and sending, to the blockchain, a request for executing the decrypted execution command via the at least one decryption key.

Abstract: A method for determining an authorization to implement a composite resource, the composite resource including at least two resources. The method is implemented within a blockchain and includes: receiving by a smart contract, called a composite contract, a query from a requesting entity desiring to obtain an authorization to implement the composite resource; obtaining, by the composite contract, addresses of smart contracts within a blockchain, the smart contracts being associated with resources included in the composite resource; and, for each smart contract: transmitting a query for authorization to implement the resource associated with this smart contract; receiving a result provided by this smart contract; and compiling results coming from a smart contract delivering a result representative of the authorization to implement the composite resource.

Abstract: A method for controlling access to a function of an application implemented by a device for controlling access to a function of an application. The control device is registered to a blockchain. The method includes: of receiving, from a first terminal, a first request to access at least one first function of the application, the application being registered in the blockchain, the request including at least one first identifier of the at least one first function and at least one identifier of the first terminal; and transmitting a response to the access request including at least one parameter for accessing the at least one first function and at least one second identifier of at least one second function registered in the blockchain, the at least one second identifier being associated with the at least one parameter.

Abstract: A method for authenticating a user with at least one service application, the user being equipped with a user device that has at least one address and is able to obtain at least one authentication datum for the user. The method is implemented by the user device and includes: receiving, from the service application, a request comprising an identifier of the user; sending, to an application registered in a blockchain, a request comprising the identifier of the user; receiving, in response to the sending, a message comprising at least one first datum corresponding to a first address of the user device, the at least one first datum having been obtained on the basis of the identifier of the user; and sending, to the first address, a request to send a message comprising the at least one authentication datum for the user to an address of the service application.

Abstract: A method is described for negotiating a contract between two parties in a telecommunications network, as well as devices implementing the method. The method includes distributing, by a first party, a smart contract comprising: a subscription method allowing a second party to distribute a transaction for subscribing to the contract proposal, a method for generating a personalised contract between the parties and requesting their registration in the blockchain, the personalised contract being generated on the basis of parameters included in the transaction, executing the subscription method by a terminal of the second party, the execution triggering the distribution of a transaction comprising parameters representing the acceptance of the contract proposal by the second party, and executing, by a mining device, the method for generating a personalised contract with these parameters.

Abstract: A method is described for proving knowledge of a first data item by a user registered to a blockchain, the first data item belonging to the user, the method being implemented by a trusted entity registered on the blockchain. The method includes obtaining the first data item outside the blockchain, generating a second data item from the first data item, outside the blockchain, the second data item to the user, and publishing the second data item in the blockchain after the second data item has been published in the blockchain by a terminal of the user.

Abstract: An access method is described, as well as an access control method implemented by an access application and an access control application registered in a blockchain. The access control application may be subscribed to the events published by the access application. Upon receipt of an access request, the access application publishes in the blockchain, a request to verify a right for the access. It receives a response to the verification request, a response determined by the access control application based on an access control policy defined by this access control application and processes the access request based on this response.