US Patent 11693393 Blockchain method for controlling an industrial process

The invention relates to an industrial process controller comprising at least three field devices coupled to one another by means of a data link, with the field devices controlling and/or monitoring an industrial process, wherein the field devices are configured to store a block chain, wherein the block chain comprises a plurality of blocks, and wherein the blocks store use data. The process controller is characterized in that the field devices are configured to delete one or more blocks from the block chain and to adapt the block chain to the change caused by the deletion.