After all of the block-chain hype nonsense all these years, this might be the first truly prefect use case for append-only, publically auditable ledgers that makes all the sense in the world
Whilst blockchain-based domains like Namecoin are great for security they don't go far enough in my opinion. Certificate authorities and DNS infrastructure are heavily centralised at the root level, so something like the Handshake Protocol[1] is a necessary decentralised alternative.
... which was still implemented without blockchain.
To be fair, the definition of blockchain is so vauge that there is a reasonable argument that certificate transparency is a block chain. But yes i agree, CT is awesome and avoids the bitcoin BS.
Git is an append-only ledger of this kind.
(Well, append-only plus regular garbage collection.)