Method for generating and saving a set of digital data or pieces of evidence associated with an individual, within a system comprising several devices transmitting and receiving pieces of evidence and a medium for communication between said devices, characterized in that it includes at least the following steps: for the generation of the data constituting a piece of evidence: • with regard to a device transmitting a piece of evidence, defining a data block characterizing the piece of evidence, the data block comprising at least a timestamp parameter, an indicator identifying said device transmitting pieces of evidence, evidence data and a signature of the transmission data by a transmission device, • with regard to the individual desiring to build up an evidence set, adding data characterizing a piece of evidence, a timestamp parameter, an indicator identifying the device receiving a piece of evidence, and an evidence signature to the receiving data block, in order to use a piece of evidence: • an individual transmits a request containing said piece of evidence, proving that they are the recipient of this piece of evidence, to a third-party system, • said third-party system contacts the device transmitting the piece of evidence, sending it at least said timestamp parameter, said indicator identifying the device transmitting pieces of evidence, and said evidence data, the transmitter signs said blocks and sends the signature back to the third-party system, which compares said signature with said original signature, so that the third-party system validates the piece of evidence if the signatures match. for the generation of the data constituting a piece of evidence: • with regard to a device transmitting a piece of evidence, defining a data block characterizing the piece of evidence, the data block comprising at least a timestamp parameter, an indicator identifying said device transmitting pieces of evidence, evidence data and a signature of the transmission data by a transmission device, • with regard to the individual desiring to build up an evidence set, adding data characterizing a piece of evidence, a timestamp parameter, an indicator identifying the device receiving a piece of evidence, and an evidence signature to the receiving data block, • with regard to a device transmitting a piece of evidence, defining a data block characterizing the piece of evidence, the data block comprising at least a timestamp parameter, an indicator identifying said device transmitting pieces of evidence, evidence data and a signature of the transmission data by a transmission device, • with regard to the individual desiring to build up an evidence set, adding data characterizing a piece of evidence, a timestamp parameter, an indicator identifying the device receiving a piece of evidence, and an evidence signature to the receiving data block, in order to use a piece of evidence: • an individual transmits a request containing said piece of evidence, proving that they are the recipient of this piece of evidence, to a third-party system, • said third-party system contacts the device transmitting the piece of evidence, sending it at least said timestamp parameter, said indicator identifying the device transmitting pieces of evidence, and said evidence data, the transmitter signs said blocks and sends the signature back to the third-party system, which compares said signature with said original signature, so that the third-party system validates the piece of evidence if the signatures match. • an individual transmits a request containing said piece of evidence, proving that they are the recipient of this piece of evidence, to a third-party system, • said third-party system contacts the device transmitting the piece of evidence, sending it at least said timestamp parameter, said indicator identifying the device transmitting pieces of evidence, and said evidence data, the transmitter signs said blocks and sends the signature back to the third-party system, which compares said signature with said original signature, so that the third-party system validates the piece of evidence if the signatures match.