工作量证明难度上升
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2009 年 12 月 30 日，我们第一次自动调整了工作量证明难度。
最低难度是 32 个零位，因此即使只有一个人在运行节点，难度也不会降到这以下。去年大部分时间里，我们都徘徊在最低值之下。12 月 30 日，我们突破了这个值，算法便将难度调高。此后每次调整，难度都在增加。
2 月 4 日的调整将难度从去年的 1.34 倍提高到了去年的 1.82 倍。这意味着，同样的工作量只能生成原来 55% 的币。
难度会根据整个网络的总算力按比例调整。如果节点数量翻倍，难度也会翻倍，使生成总量恢复到目标速率。
对于有技术兴趣的人，可以在 debug.log 中搜索“target:”来查看工作量证明难度。它是一个 256 位无符号十六进制数；要成功生成区块，SHA-256 值必须小于它。它每 2016 个区块调整一次，通常是两周。这时 debug.log 中会输出“GetNextWorkRequired RETARGET”。
最低值 00000000ffff0000000000000000000000000000000000000000000000000000 30/12/2009 00000000d86a0000000000000000000000000000000000000000000000000000 11/01/2010 00000000c4280000000000000000000000000000000000000000000000000000 25/01/2010 00000000be710000000000000000000000000000000000000000000000000000 04/02/2010 000000008cc30000000000000000000000000000000000000000000000000000 14/02/2010 0000000065465700000000000000000000000000000000000000000000000000 24/02/2010 0000000043b3e500000000000000000000000000000000000000000000000000 08/03/2010 00000000387f6f00000000000000000000000000000000000000000000000000 21/03/2010 0000000038137500000000000000000000000000000000000000000000000000 01/04/2010 000000002a111500000000000000000000000000000000000000000000000000 12/04/2010 0000000020bca700000000000000000000000000000000000000000000000000 21/04/2010 0000000016546f00000000000000000000000000000000000000000000000000 04/05/2010 0000000013ec5300000000000000000000000000000000000000000000000000 19/05/2010 00000000159c2400000000000000000000000000000000000000000000000000 29/05/2010 000000000f675c00000000000000000000000000000000000000000000000000 11/06/2010 000000000eba6400000000000000000000000000000000000000000000000000 24/06/2010 000000000d314200000000000000000000000000000000000000000000000000 06/07/2010 000000000ae49300000000000000000000000000000000000000000000000000 13/07/2010 0000000005a3f400000000000000000000000000000000000000000000000000 16/07/2010 000000000168fd00000000000000000000000000000000000000000000000000 27/07/2010 00000000010c5a00000000000000000000000000000000000000000000000000 05/08/2010 0000000000ba1800000000000000000000000000000000000000000000000000 15/08/2010 0000000000800e00000000000000000000000000000000000000000000000000 26/08/2010 0000000000692000000000000000000000000000000000000000000000000000
日期，难度倍数，变化百分比 2009 1.00 30/12/2009 1.18 +18% 11/01/2010 1.31 +11% 25/01/2010 1.34 +2% 04/02/2010 1.82 +36% 14/02/2010 2.53 +39% 24/02/2010 3.78 +49% 08/03/2010 4.53 +20% 21/03/2010 4.57 +9% 01/04/2010 6.09 +33% 12/04/2010 7.82 +28% 21/04/2010 11.46 +47% 04/05/2010 12.85 +12% 19/05/2010 11.85 -8% 29/05/2010 16.62 +40% 11/06/2010 17.38 +5% 24/06/2010 19.41 +12% 06/07/2010 23.50 +21% 13/07/2010 45.38 +93% 16/07/2010 181.54 +300% 27/07/2010 244.21 +35% 05/08/2010 352.17 +44% 15/08/2010 511.77 +45% 26/08/2010 623.39 +22%
英文原文
展开英文原文
We had our first automatic adjustment of the proof-of-work difficulty on 30 Dec 2009.
The minimum difficulty is 32 zero bits, so even if only one person was running a node, the difficulty doesn't get any easier than that. For most of last year, we were hovering below the minimum. On 30 Dec we broke above it and the algorithm adjusted to more difficulty. It's been getting more difficult at each adjustment since then.
The adjustment on 04 Feb took it up from 1.34 times last year's difficulty to 1.82 times more difficult than last year. That means you generate only 55% as many coins for the same amount of work.
The difficulty adjusts proportionally to the total effort across the network. If the number of nodes doubles, the difficulty will also double, returning the total generated to the target rate.
For those technically inclined, the proof-of-work difficulty can be seen by searching on "target:" in debug.log. It's a 256-bit unsigned hex number, which the SHA-256 value has to be less than to successfully generate a block. It gets adjusted every 2016 blocks, typically two weeks. That's when it prints "GetNextWorkRequired RETARGET" in debug.log.
minimum 00000000ffff0000000000000000000000000000000000000000000000000000 30/12/2009 00000000d86a0000000000000000000000000000000000000000000000000000 11/01/2010 00000000c4280000000000000000000000000000000000000000000000000000 25/01/2010 00000000be710000000000000000000000000000000000000000000000000000 04/02/2010 000000008cc30000000000000000000000000000000000000000000000000000 14/02/2010 0000000065465700000000000000000000000000000000000000000000000000 24/02/2010 0000000043b3e500000000000000000000000000000000000000000000000000 08/03/2010 00000000387f6f00000000000000000000000000000000000000000000000000 21/03/2010 0000000038137500000000000000000000000000000000000000000000000000 01/04/2010 000000002a111500000000000000000000000000000000000000000000000000 12/04/2010 0000000020bca700000000000000000000000000000000000000000000000000 21/04/2010 0000000016546f00000000000000000000000000000000000000000000000000 04/05/2010 0000000013ec5300000000000000000000000000000000000000000000000000 19/05/2010 00000000159c2400000000000000000000000000000000000000000000000000 29/05/2010 000000000f675c00000000000000000000000000000000000000000000000000 11/06/2010 000000000eba6400000000000000000000000000000000000000000000000000 24/06/2010 000000000d314200000000000000000000000000000000000000000000000000 06/07/2010 000000000ae49300000000000000000000000000000000000000000000000000 13/07/2010 0000000005a3f400000000000000000000000000000000000000000000000000 16/07/2010 000000000168fd00000000000000000000000000000000000000000000000000 27/07/2010 00000000010c5a00000000000000000000000000000000000000000000000000 05/08/2010 0000000000ba1800000000000000000000000000000000000000000000000000 15/08/2010 0000000000800e00000000000000000000000000000000000000000000000000 26/08/2010 0000000000692000000000000000000000000000000000000000000000000000
date, difficulty factor, % change 2009 1.00 30/12/2009 1.18 +18% 11/01/2010 1.31 +11% 25/01/2010 1.34 +2% 04/02/2010 1.82 +36% 14/02/2010 2.53 +39% 24/02/2010 3.78 +49% 08/03/2010 4.53 +20% 21/03/2010 4.57 +9% 01/04/2010 6.09 +33% 12/04/2010 7.82 +28% 21/04/2010 11.46 +47% 04/05/2010 12.85 +12% 19/05/2010 11.85 -8% 29/05/2010 16.62 +40% 11/06/2010 17.38 +5% 24/06/2010 19.41 +12% 06/07/2010 23.50 +21% 13/07/2010 45.38 +93% 16/07/2010 181.54 +300% 27/07/2010 244.21 +35% 05/08/2010 352.17 +44% 15/08/2010 511.77 +45% 26/08/2010 623.39 +22%