user135955: Simple question: when a miners receives a block of transactions, he can't add fraudulent transactions because they need to be appropriately signed, but what prevents him from erasing a tx? If he manage to find the correct nonce of the modified block, as I understand it will still be a valid block accepted by the blockchain.

user47827: If a miner makes any change to a block the proof of work is no longer valid and it has to start the mining process from scratch again. So a miner can refuse to accept a valid block mined by another miner but it generally isn't in their interests to as the rest of the miners will have moved onto attempting to mine the next block on top of that block.

135955: <p>Simple question: when a miners receives a block of transactions, he can't add fraudulent transactions because they need to be appropriately signed, but what prevents him from erasing a tx? If he manage to find the correct nonce of the modified block, as I understand it will still be a valid block accepted by the blockchain.</p>
 47827: <p>If a miner makes any change to a block the proof of work is no longer valid and it has to start the mining process from scratch again. So a miner can refuse to accept a valid block mined by another miner but it generally isn't in their interests to as the rest of the miners will have moved onto attempting to mine the next block on top of that block.</p>
