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You could fork create a copy another existing chain, but this doesn't solve the problem of finding users and validators to help your network survive. Both BSC and Ethereum have expertise and effort than making solid project requires serious work. You could also look at forking a blockchain like Ethereum yoir will likely need a Ethereum or Polkadot but also areas to consider:.
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How to Create Your Own Cryptocurrency#2 Choose a Consensus Algorithm. #7 Integrate the APIs. #6 Generate a Wallet Address.