Method for sharing data between participants of a network, the method comprising a data cryptography step using an asymmetrical double key cryptography scheme, each participant having at least one double key, wherein, a block chain being used, a block comprising a digital imprint of the preceding block in the block chain and at least one transaction which comprises data to be shared, at least one block being an initialization block which initializes the block chain and at least one block being a block for registering a new participant, at least one participant being a major participant, at least one participant being a subordinate participant and at least one participant being a data-processing equipment item, a major participant being authorized to request participation in the network of a new major participant and a subordinate participant and a new data-processing equipment item, a subordinate participant being authorized only to request participation in the network for a new data-processing equipment item, the method comprises: - an initialization step (STP1) of the block chain which comprises an operation for storing the at least one initialization block in the block chain by a predetermined authority using at least one computer, the at least one initialization block comprising at least one transaction which includes an identity registration of a major participant, - a step of accepting a new participant (STP2) in the block chain which includes an operation for storing at least one block for registering a new participant in the block chain by a major or subordinate participant using at least one computer, the at least one block for registering a new participant comprising at least one transaction which includes an identity registration of a new participant, an identity registration of a major/subordinate participant or data-processing equipment item comprising identification data of this major participant/subordinate participant or data-processing equipment item which includes at least one identifier of this major participant/subordinate participant or data-processing equipment item, a public key of a double key referred to as a double signature key of this major participant/subordinate participant or data-processing equipment item intended for data signature, a public key of a double key referred to as a double encryption key of this major participant/subordinate participant or data-processing equipment item intended for the encryption of data, a public key of a double key referred to as a double revocation key of this major participant/subordinate participant or data-processing equipment item which is intended for the revocation of at least the double encryption key and the double signature key of this major participant/subordinate participant or data-processing equipment item, the authority no longer intervening following the initialization step or intervening only during a step of re-initialization of a participant following a revocation of the double revocation key of this participant. - an initialization step (STP1) of the block chain which comprises an operation for storing the at least one initialization block in the block chain by a predetermined authority using at least one computer, the at least one initialization block comprising at least one transaction which includes an identity registration of a major participant, - a step of accepting a new participant (STP2) in the block chain which includes an operation for storing at least one block for registering a new participant in the block chain by a major or subordinate participant using at least one computer, the at least one block for registering a new participant comprising at least one transaction which includes an identity registration of a new participant, <EOS>