Mining is the process of adding transaction records to Bitcoin's public ledger of past transactions. This ledger of past transactions is called the block chain as it is a chain of blocks. The block chain serves to confirm transactions to the rest of the network as having taken place. Bitcoin nodes use the block chain to distinguish legitimate Bitcoin transactions from attempts to re-spend coins that have already been spent elsewhere.
OO has been the only tool that has helped me THINK with my material, my general long-form notes can be unstructured and chaotic, and the constraints and hierarchies of the outliner really help me navigate both the micro and macro topics effortlessly. While I keep archival long-form notes and files in Evernote, I find it too bulky and buggy for daily lightweight use.