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Miners hash the block headers. The block headers themselves contain the Merkle root of all the transactions in the block. If you change a single transaction, you change the Merkle root, and you change the hash of the header (which is your pow).
Miners hash the block headers. The block headers themselves contain the Merkle root of all the transactions in the block. If you change a single transaction, you change the Merkle root, and you change the hash of the header (which is your pow).