Inserting a further data block into a first ledger

A system for inserting a further data block into a first ledger, wherein the first ledger includes a plurality of data blocks, the system comprising:

• an interface, configured to receive a medical dataset, the medical dataset being a log of an access of an entity to a medical apparatus and the medical dataset including an identifier of the medical apparatus and an identifier of the entity accessing the medical apparatus, the access of the entity to the medical apparatus including interaction of the entity with the medical apparatus;
• and
• a processor, configured to cause the system to
• select a parent data block of the first ledger, the parent data block being selected based on a maximal sum of distances from the parent data block to each of a first origin data block and a second origin data block of the first ledger,
• determine the further data block, the further data block including the medical dataset and link information, and the link information including a hash of at least one of the plurality of data blocks of the first ledger,
• insert the further data block into the first ledger, and
• grant remote access to the entity accessing the medical apparatus after inserting the further data block into the first ledger, the interaction of the entity with the medical apparatus being a remote connection between the entity and the medical apparatus.