Proof of work is the key element of bitcoin, not blockchain in my opinion. From the same source: "A blockchain[1][2][3] – originally block chain[4][5] – is a c

Proof of work is the key element of bitcoin, not blockchain in my opinion. From the same source: "A blockchain[1][2][3] – originally block chain[4][5] – is a continuously growing list of records, called blocks, which are linked and secured using cryptography.[1][6] Each block typically contains a hash pointer as a link to a previous block,[6] a timestamp and transaction data.[7] By design, blockchains are inherently resistant to modification of the data." https://en.wikipedia.org/wiki/Blockchain https://en.wikipedia.org/wiki/Blockchain