So far, bitcoin is the only major digital coin. The second coin is the Ethereum. If that survive the recent crisis, it could be big.
yes there is no doubt about this that bitcoin is the world number one crypto currency but on number two now we can see the One con has taken the place o Ethereum. now we can that after bitcoin One coin is the world second crypto currency. but still bitcion does not need for any currency and it can continue its status without bitcoin.