Because it turns out the good bits are the ledger of transactions made tamper-evident in a Merkle tree, and we had that with Git in 2005 and it works great than

Because it turns out the good bits are the ledger of transactions made tamper-evident in a Merkle tree, and we had that with Git in 2005 and it works great thanks. The bit Git doesn't do: distributed consensus via Proof of Work, because it turns out that a bit of trust is fabulously more efficient. I predict any good and useful product labeled "Blockchain" will be the cryptographically tamper-evident ledger of transactions, and not any of the stuff that makes a blockchain different to Git. (Researching the book, I had one developer admit that his "blockchain product" was pretty much a simplified Git in terms of what it offered ;-) )