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The issue you raise is the problem of finality in blockchain consensus. While highly unlikely, it is possible for a transaction to be dropped even after 5 confirmations. This would only happen if there is a temporary fork in the blockchain and the chain with your transaction gets dropped in favour of an alternate, "longer" chain. If that happens ...


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A transaction cannot be removed from the blockchain: once it is saved in a block it is there forever(*). A transaction could be rejected, should this happen it will not be present in a block. (*) A whole block could be rejected AFTER the first confirmations , but this is a sort of catastrophic event that means a lot of bad things happened; ALL the following ...


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