Let's say I have a transaction that I manually altered to include transaction fees that are higher than the required amount of fees. The transaction is perfectly balanced and, apart from this, does not differ from a normal transaction. Is this transaction valid ? Or will it be refused by the blockchain nodes ?

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Yes, as long as the all inputs match the outputs (minus the fee), and the fee is equal to or greater than the minimum fee as per the protocol parameters, it should be a valid transaction.

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