I just have a very basic doubt. Suppose there's a public blockchain network like Bitcoin comprising several nodes. Would it be possible that this network consists of multiple mainchains??I am not talking about the situation where orphan nodes are created. My situation is say, there are 4 txns T1,T2,T3,T4. Now for each of these transactions, would there be 4 separate main chain for each transaction or one single mainblockchain which comprises these transactions in same/diff blocks that might have got generated after from the beginning of the genesis block.