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?

  • 1
    It depends on the pool's policy. This is called NTime rolling. Commented Feb 10, 2012 at 7:18
  • 1
    @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
    Commented Feb 10, 2012 at 8:26

1 Answer 1


Yes, the miner can increment the time stamp by a limited amount, but only if the pool advertises X-Roll-NTime as a feature. DiabloMiner and CGMiner both support this.

See the official spec for more information.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.