I'm assuming that they're specifically using the Bitcoin blockchain, not necessarily starting their own from scratch. If they want their own blockchain, then th

I'm assuming that they're specifically using the Bitcoin blockchain, not necessarily starting their own from scratch. If they want their own blockchain, then they need to distribute the mining just like Bitcoin has done, or else it defeats the purpose of having a blockchain (i.e., might as well just run their own centralized service without a blockchain). So, assuming they're building on the Bitcoin blockchain, then Bitcoin miners will be computing the blockchain changes and NASDAQ will be participating by issuing special transactions that enable whatever it is that they're building.