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Why is Cartesi has oppurtunity to grow usecase? They are developing platform for Linux developers and Linux is not so popular. So why?
And whats usecase of their tokens?
I think you misunderstood the main idea of the project. Cartesi is a second layer solution for DApps, it is not for users, it is for businesses and developers. The main idea is to bring massive computations off-chain saving mainchain security. Developers will use Cartesi in order to increase scalability of their DApps on old chains with low TPS like current PoW Ethereum network. There are already some DApps using this solution and different partnerships, like with Binance Smart Chain.
The CTSI token will be used for the Cartesi Mainchain Mining (Staking). There is Pre-Staking on Coinone already available and 2 rounds has been covered so far. Mainnet Mining is coming soon.
So as a developer you can use Cartesi solution to grow your DApp, as a user you can use CTSI for Mining (Staking).
You can find more details here:
https://t.me/CartesiAnnouncementshttps://cartesi.io/mineWell, but Cartesy is not the first project which 2nd layer blockchains and 2nd layer projects for ethereum network. So whats advantages before existed project?
Staking is not an usecase at all also. its just an insentive for holders.