There is no token/currency associated to it, and it's made for a single specific purpose only, compared to most blockchains which try to run programs, manage wa

There is no token/currency associated to it, and it's made for a single specific purpose only, compared to most blockchains which try to run programs, manage wallets, etc. It also doesn't have a decentralized consensus algorithm, nor is there a gossip network to inform about new transactions that are to be added to the log. It's centralized per design. Which of these differences you see as important to the blockchain / non-blockchain distinction, depends on the precise definition for blockchain that you want to use. That being said, even the CT website uses the term "ledger" to explain what the logs are: https://certificate.transparency.dev/howctworks/ https://certificate.transparency.dev/howctworks/