Can you tell me what computers have to do with bitcoin? Why do you need computers and energy be be dealing with bitcoin?
My understanding is limited as to the underlying technology, but bitcoin is based on a distributed digital database called a blockchain. The database is only accessible by the use of digital keys. This is all accomplished by using very, very powerful computers to mathematically “discover” the blocks that make up the data base.
It takes a lot of electrical power to run the Bitcoin “mining” systems.