Technology that resemble blockchain already exist since late 90s. But on other hand, i wonder since when they use blockchain. I haven't done through research, but it looks like they create their own distributed immutable system since 2007, but later decide to call it blockchain.
The project started in 2007, it went online in different stages but it was called blockchain since being released to the public.
But again, the naming wouldn't have mattered even if they would have chosen another name, say keychain or something because if we go by the basics it's a blockchain, not decentralized but truly a blockchain storing hashes of personal data instead of transactions.
It simply doesn't work in practical terms.
We have one country that has been using it for almost two decades, now and you still it doesn't work?
Yes,bitcoin Is based on the blockchain network,its just like the symbiotic relationship that exists between two living organisms in biology,where both organisms benefit from each other support,interaction and existence.
Nothing like that, blockchains can exist without bitcoin, bitcoin can't exist without a blockchain.