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You are correct to think the latest block or blocks that you’ve received could be orphaned. This is the reason you don’t immediately rely on data in the most recent blocks. You will generally want to wait for a certain number of confirmation blocks, to make sure the block you received will in fact be part of the longest chain moving forward and will not be ...


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Why do you need two nodes ? Are two different accounts, one for the "initiator" and the other for the "executor", not sufficiant ? Nodes validate transactions, they don't play a business role in your smart contract. To answer your question, if you want several nodes you have to build your own private blockchain using clients such as Geth ...


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