A method for the integrity protection of digitally coded copies (110, 120, 130, 314) of a digitally coded original document using a blockchain structure (111, 121, 131, 200, 201, 229, 231, 312, 316) integrated into identifiers (114, 124, 134, 315) of the copies (110, 120, 130, 314) for logging the derived history of the copies, wherein the method comprises: • calling up a first digitally coded copy template, which comprises data of the digitally coded original document, with the use of an identifier of the first copy template, which comprises an address for calling up the first copy template and a blockchain structure as a parameter value in which the derived history of the first copy template is logged, • creating a first digitally coded copy (120, 130, 314) of data of the first copy template, wherein the copied data of the first copy (120, 130, 314) comprise the data of the digitally coded original document, • providing the first copy (120, 130, 314) at an address (125, 135, 317) for calling up the first copy (120, 130, 314), • creating an identifier (124, 134, 315) of the first copy (120, 130, 314), wherein the identifier (124, 134, 315) of the first copy (120, 130, 314) comprises the address (125, 135, 313) of the first copy (120, 130, 314) and as a parameter value the blockchain structure of the first copy template, wherein an additional block (128, 136) is added to the blockchain structure, wherein the additional block (128, 136) is assigned to the first copy template, wherein the additional block (128, 136) comprises the address of the first copy template and a test feature of the copied data, which enables an integrity check of the copied data including the identifier of the first copy template, • providing the identifier (124, 134, 315) of the first copy (120, 130, 314) for calling up the first copy (120, 130, 314) and for checking the identity of the copied data of the first copy (120, 130, 314). • calling up a first digitally coded copy template, which comprises data of the digitally coded original document, with the use of an identifier of the first copy template, which comprises an address for calling up the first copy template and a blockchain structure as a parameter value in which the derived history of the first copy template is logged, • creating a first digitally coded copy (120, 130, 314) of data of the first copy template, wherein the copied data of the first copy (120, 130, 314) comprise the data of the digitally coded original document, • providing the first copy (120, 130, 314) at an address (125, 135, 317) for calling up the first copy (120, 130, 314), • creating an identifier (124, 134, 315) of the first copy (120, 130, 314), wherein the identifier (124, 134, 315) of the first copy (120, 130, 314) comprises the address (125, 135, 313) of the first copy (120, 130, 314) and as a parameter value the blockchain structure of the first copy template, wherein an additional block (128, 136) is added to the blockchain structure, wherein the additional block (128, 136) is assigned to the first copy template, wherein the additional block (128, 136) comprises the address of the first copy template and a test feature of the copied data, which enables an integrity check of the copied data including the identifier of the first copy template, • providing the identifier (124, 134, 315) of the first copy (120, 130, 314) for calling up the first copy (120, 130, 314) and for checking the identity of the copied data of the first copy (120, 130, 314).