Bitcoin is the only legit blockchain. You don't have to take my word for it; he proved it in the paper. The blockchain with the longest proof-of-work is always

Bitcoin is the only legit blockchain. You don't have to take my word for it; he proved it in the paper. The blockchain with the longest proof-of-work is always the real one, given multiple competing blockchains. All other cryptos are attempting (and failing) to do a 51% attack on Bitcoin's preexisting longer blockchain.