Close. Bitcoin is a concept for a system - described in a whitepaper and in forum posts, and expressed in an initial release. BTC would prefer you think they alone are Bitcoin, but is the Catholic Church alone Christianity? Certainly not. BTC, BCH, and BSV are all implementations of that idea, each with various degrees of similarity to the original Bitcoin, and each of which share a history back to the genesis block. Interestingly, when you dive in, you'll see that BTC is the one that has diverged the furthest from the project's original goals and protocol, not the so-called "forks" BCH and BSV, which were both created from not wanting to change protocol rules. This is good reading if this viewpoint is new: https://thatsbtcnotbitcoin.com