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

<p>See the <a href="https://en.bitcoin.it/wiki/Getwork#rollntime" rel="nofollow">official spec</a> for more information.</p>

CC BY-SA 3.0
2012-03-30T11:03:26.787Z
2012-03-30T11:03:26.787Z
Diablo-D3
<p>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?</p>

CC BY-SA 3.0
2012-02-10T07:18:03.013Z
It depends on the pool's policy. This is called [NTime rolling](http://bitcoin.stackexchange.com/questions/1482/what-is-ntime-rolling-nonce-range-and-what-miners-support-it).
David Schwartz
CC BY-SA 3.0
2012-02-10T08:26:48.860Z
@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
<bitcoind><mining-pools><mining-technical-details><getwork><timestamp>
Getwork - can the miner increment timestamp?
ThePiachu
# Getwork - can the miner increment timestamp?

(Asked by: username_0 on 2012-02-10)

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?

**Tags:** bitcoind, mining-pools, mining-technical-details, getwork, timestamp

> **Comments:**
> **username_1**: It depends on the pool's policy. This is called [NTime rolling](http://bitcoin.stackexchange.com/questions/1482/what-is-ntime-rolling-nonce-range-and-what-miners-support-it).  
> **username_0**: @username_1 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.  

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## 1 answers

### Answer by username_2 on 2012-03-30. Score: 4 | Accepted answer

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](https://en.bitcoin.it/wiki/Getwork#rollntime) for more information.


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