the blockchain is one of the four ingredients that makes bitcoin work
it is the database of bitcoin. it is probably the worst database there is. using a blockchain to save data is pretty stupid
except in the case of bitcoin
it is needed for bitcoin to determine how many bitcoins each person owns
the blocks (including transactions) are chained together, which is an important security feature to make sure no one tampers with the entries
it is only needed in a trustless system. a blockchain is useless outside of bitcoin
“blockchain technology” is just a hype word used to take your money
src pub sub mail