A community-created ledger like a blockchain doesnt need a central authority to maintain it, because the community does that job. It is ideal for decentralised, unregulated, largely anonymous digital cash systems such as Bitcoin and Monero. The validation algorithm is deliberately designed to make it time-consuming to come up with a genuine transaction confirmation. This process is known in the jargon as cryptomining, and is often carried out by cybercrooks. Cryptojacking is often considered the best of a lot, given that it doesn’t try to plunder your data.”]