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2 questions
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Access control in ethereum
Can you let some nodes in ethereum network have only view access while others can to mine blocks and add them to blockchain? Can the miners be authorized nodes only?
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Withdrawing ethereum from a smart contract (return to sender)
Let's say I have a decentralized application that allows people to buy some object at an arbitrary price.
User 1 purchases the object for 1 eth. A few moments later, user 2 purchases the same item. ...
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