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I need a way to ensure that transactions coming to my non-smartcontract Ethereum wallet can't be reversed. Is it enough to check that each incoming transaction has as least N confirmations just like in Bitcoin world, or I should also ensure that the "data" field ("input" in Parity API) is empty because otherwise it can be exploited in some way?

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It's enough to check that each incoming transaction has at least n confirmations.

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Wait for X confirmations to ensure that the transactions are part of the cannonical chain.

For more on msg.data check out What is msg.data?

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