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When requesting getwork from bitcoind or a pool, the miner is expected to be incrementing the nonce value of the block, but can it also increment the timestamp value, or would such tempering cause a submitted work to be rejected by bitcoind or a given pool?
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It depends on the pool's policy. This is called NTime rolling.
– David Schwartz – 2012-02-10T07:18:03.0131@DavidSchwartz Hmm, I was thinking that's what it should be, although some descriptions for NTime rolling implied that it allows a miner not to discard an unfinished getwork after one second, not that it allows the miner to increment timestamp. – ThePiachu – 2012-02-10T08:26:48.860