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From: shaolinfry <shaolinfry@protonmail.ch>
To: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Subject: [bitcoin-dev] Height based vs block time based thresholds
Date: Tue, 04 Jul 2017 21:30:26 -0400	[thread overview]
Message-ID: <KXL-Ie0q1dKTlbQ2XCyTRCzoQLND-Q7M9CFvYTfhjgeiZ4K3knpetQSwwLviO6whuHXQnFPg-rg8q1xW8w5mNnYFxalvx5_9Vci63lC9ju4=@protonmail.ch> (raw)

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Some people have criticized BIP9's blocktime based thresholds arguing they are confusing (the first retarget after threshold). It is also vulnerable to miners fiddling with timestamps in a way that could prevent or delay activation - for example by only advancing the block timestamp by 1 second you would never meet the threshold (although this would come a the penalty of hiking the difficulty dramatically).
On the other hand, the exact date of a height based thresholds is hard to predict a long time in advance due to difficulty fluctuations. However, there is certainty at a given block height and it's easy to monitor.
If there is sufficient interest, I would be happy to amend BIP8 to be height based. I originally omitted height based thresholds in the interests of simplicity of review - but now that the proposal has been widely reviewed it would be a trivial amendment.

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             reply	other threads:[~2017-07-05  1:30 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-07-05  1:30 shaolinfry [this message]
2017-07-05  2:25 ` [bitcoin-dev] Height based vs block time based thresholds Troy Benjegerdes
2017-07-05  3:39 ` Bram Cohen
2017-07-05  3:50 ` Luke Dashjr
2017-07-05  4:00   ` shaolinfry
2017-07-05  4:10     ` Luke Dashjr
2017-07-05 19:44       ` Hampus Sjöberg
2017-07-06 17:20         ` Jorge Timón
2017-07-06 17:41           ` Eric Voskuil
2017-07-05  8:06   ` Gregory Maxwell
2017-07-05  8:54     ` Kekcoin
2017-07-06 20:43     ` Luke Dashjr
2017-07-07  5:52 ` shaolinfry
2017-07-07  9:51   ` Jorge Timón

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