Hi,

QuarkChain received a lot of attention recently and is currently in the beginning of its KYC process for the public sell. There are a lot of short reviews and summaries out there, yet I would like to learn and discuss more on the details of the technology. As there is no open source code yet (announced for around June), it is probably difficult to discuss the details of QuarkChain's technology and code, but based on QuarkChain's general architecture, about which we can read more details in the whitepaper, what are tech experts in this forum saying about it in comparison to other blockchains such as Bitcoin, or e.g. DAG solutions, Hashgraph, etc.?

I am relatively new and still processing blockchain basics such as Satoshi's paper, Gavin Wood's Ethereum whitepaper or also newer contributions such as those by Algorand to understand more about the technology and issues to be resolved. With my little understanding, I am personally strongly interested in QuarkChain's project and can only invite everyone to have look at it, but also would like to remain critical and learn more on its solution of the scalability issue.

To raise first questions to start a discussion, I would be interested to hear opinions on potential risks due to QuarkChain's 2-layered blockchain solution. I think QuarkChain is very clear about the fact that there are certain trade-offs between scalability and security (and also decentralization), and I find the solution to flexibly adjust the overall hash power distributed onto the root chain a very interesting approach to adjust to different security requirements. Based on existing projects, are there any estimates what the minimum amount of the hash power for the root chain should be (and why) and do you think that the current 25% of overall hash power (=50% of the root chain's hash power) on the testnet are sufficient to secure the integrity of the system?

Moreover, I would be very eager to hear your opinion on the eco-friendliness of QuarkChains PoW consensus, something I have to admit did not receive enough attention in the current materials of QuarkChain in my oppinion. As I would see this another major issue of current blockchain technologies that is connected to PoW, is QuarkChain's architecture more energy efficient regarding mining power (e.g. through the different difficulty levels of side chains, etc.)?

I equally want to invite any other technical input on QuarkChain, as much as I would like newcomers (like me) to ask questions, no matter how basic, as long as they are constructive and well-intended!

Please keep in mind that this is not intended to be an ICO review! Thx!