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What's the advantage over Lisk? Lisk is written in JavaScript, a language used in like 99% of websites. What can I do with Nimiq that I cannot do with Lisk?
While Lisk is based on JavaScript, it is not a web-based blockchain! In Nimiq, you browser is a real client to the blockchain, which can do the same things as any full node.Or as we like to put it: browsers are a first-class citizen of the blockchain.
You can view Lisk rather as a JavaScript-based Ethereum competitor.
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How does mining work?I can mine using the browser,but what about the coin i mine?Is there any wallet or similiar?
In the betanet, a wallet is implicitly created for you. 