Target
The number you need to get below to mine a block.
The target is used in mining. It is a number that a block hash must be below for the block to be added on to the blockchain.
The target adjusts every 2016 blocks (roughly two weeks) to try and ensure that blocks are mined once every 10 minutes on average. It therefore creates a consistent time between blocks and a consistent issuance of new bitcoins in to the network (via the block reward).
To compensate for increasing hardware speed and varying interest in running nodes over time, the proof-of-work difficulty is determined by a moving average targeting an average number of blocks per hour. If they’re generated too fast, the difficulty increases. – Satoshi Nakamoto
Current target:
00000000000000000004e90f0000000000000000000000000000000000000000
Block 810,451
The target is in hexadecimal, but it’s still a number.
1. When does the target adjust?
The target adjusts on every 2016th block. This is roughly every two weeks (because there are 20,160 minutes in a two-week period).
Here are the dates and target values for every target adjustment in Bitcoin’s history:
Bitcoin Target History
0 | 03 Jan 2009, 18:15:05 |
00000000ffff0000000000000000000000000000000000000000000000000000
|
2,016 | 27 Jan 2009, 13:38:51 |
00000000ffff0000000000000000000000000000000000000000000000000000
|
4,032 | 12 Feb 2009, 19:16:30 |
00000000ffff0000000000000000000000000000000000000000000000000000
|
6,048 | 02 Mar 2009, 04:01:53 |
00000000ffff0000000000000000000000000000000000000000000000000000
|
8,064 | 20 Mar 2009, 00:26:26 |
00000000ffff0000000000000000000000000000000000000000000000000000
|
10,080 | 06 Apr 2009, 22:04:23 |
00000000ffff0000000000000000000000000000000000000000000000000000
|
12,096 | 24 Apr 2009, 18:51:38 |
00000000ffff0000000000000000000000000000000000000000000000000000
|
14,112 | 12 May 2009, 03:20:25 |
00000000ffff0000000000000000000000000000000000000000000000000000
|
16,128 | 31 May 2009, 02:31:25 |
00000000ffff0000000000000000000000000000000000000000000000000000
|
18,144 | 26 Jun 2009, 21:32:53 |
00000000ffff0000000000000000000000000000000000000000000000000000
|
20,160 | 25 Jul 2009, 00:30:16 |
00000000ffff0000000000000000000000000000000000000000000000000000
|
22,176 | 04 Sep 2009, 13:01:38 |
00000000ffff0000000000000000000000000000000000000000000000000000
|
24,192 | 02 Oct 2009, 03:27:08 |
00000000ffff0000000000000000000000000000000000000000000000000000
|
26,208 | 31 Oct 2009, 15:28:20 |
00000000ffff0000000000000000000000000000000000000000000000000000
|
28,224 | 27 Nov 2009, 21:51:07 |
00000000ffff0000000000000000000000000000000000000000000000000000
|
30,240 | 18 Dec 2009, 09:56:01 |
00000000ffff0000000000000000000000000000000000000000000000000000
|
32,256 | 30 Dec 2009, 06:11:04 |
00000000d86a0000000000000000000000000000000000000000000000000000
|
34,272 | 11 Jan 2010, 22:48:37 |
00000000c4280000000000000000000000000000000000000000000000000000
|
36,288 | 25 Jan 2010, 13:07:59 |
00000000be710000000000000000000000000000000000000000000000000000
|
38,304 | 04 Feb 2010, 21:43:14 |
000000008cc30000000000000000000000000000000000000000000000000000
|
40,320 | 14 Feb 2010, 23:52:59 |
0000000065465700000000000000000000000000000000000000000000000000
|
42,336 | 24 Feb 2010, 08:41:04 |
0000000043b3e500000000000000000000000000000000000000000000000000
|
44,352 | 08 Mar 2010, 01:14:33 |
00000000387f6f00000000000000000000000000000000000000000000000000
|
46,368 | 21 Mar 2010, 22:54:24 |
0000000038137500000000000000000000000000000000000000000000000000
|
48,384 | 01 Apr 2010, 11:07:22 |
000000002a111500000000000000000000000000000000000000000000000000
|
50,400 | 12 Apr 2010, 08:39:46 |
0000000020bca700000000000000000000000000000000000000000000000000
|
52,416 | 21 Apr 2010, 21:52:52 |
0000000016546f00000000000000000000000000000000000000000000000000
|
54,432 | 04 May 2010, 09:46:16 |
0000000013ec5300000000000000000000000000000000000000000000000000
|
56,448 | 19 May 2010, 14:13:55 |
00000000159c2400000000000000000000000000000000000000000000000000
|
58,464 | 29 May 2010, 13:57:28 |
000000000f675c00000000000000000000000000000000000000000000000000
|
60,480 | 11 Jun 2010, 23:26:26 |
000000000eba6400000000000000000000000000000000000000000000000000
|
62,496 | 24 Jun 2010, 12:27:26 |
000000000d314200000000000000000000000000000000000000000000000000
|
64,512 | 06 Jul 2010, 01:57:44 |
000000000ae49300000000000000000000000000000000000000000000000000
|
66,528 | 13 Jul 2010, 08:03:57 |
0000000005a3f400000000000000000000000000000000000000000000000000
|
68,544 | 16 Jul 2010, 16:29:39 |
000000000168fd00000000000000000000000000000000000000000000000000
|
70,560 | 27 Jul 2010, 02:42:38 |
00000000010c5a00000000000000000000000000000000000000000000000000
|
72,576 | 05 Aug 2010, 19:46:35 |
0000000000ba1800000000000000000000000000000000000000000000000000
|
74,592 | 15 Aug 2010, 11:11:11 |
0000000000800e00000000000000000000000000000000000000000000000000
|
76,608 | 26 Aug 2010, 23:13:23 |
0000000000692098000000000000000000000000000000000000000000000000
|
78,624 | 08 Sep 2010, 05:04:49 |
00000000005bede6000000000000000000000000000000000000000000000000
|
80,640 | 19 Sep 2010, 02:04:07 |
00000000004766ed000000000000000000000000000000000000000000000000
|
82,656 | 28 Sep 2010, 19:58:28 |
000000000031b2a3000000000000000000000000000000000000000000000000
|
84,672 | 12 Oct 2010, 05:35:05 |
00000000002f8e9d000000000000000000000000000000000000000000000000
|
86,688 | 21 Oct 2010, 05:13:15 |
00000000001e7eca000000000000000000000000000000000000000000000000
|
88,704 | 30 Oct 2010, 22:58:47 |
0000000000153263000000000000000000000000000000000000000000000000
|
90,720 | 09 Nov 2010, 12:29:28 |
00000000000e7256000000000000000000000000000000000000000000000000
|
92,736 | 18 Nov 2010, 18:44:34 |
0000000000098b2a000000000000000000000000000000000000000000000000
|
94,752 | 30 Nov 2010, 16:37:55 |
0000000000081cd2000000000000000000000000000000000000000000000000
|
96,768 | 09 Dec 2010, 22:20:02 |
0000000000055953000000000000000000000000000000000000000000000000
|
98,784 | 21 Dec 2010, 18:34:03 |
000000000004864c000000000000000000000000000000000000000000000000
|
100,800 | 03 Jan 2011, 05:10:11 |
00000000000404cb000000000000000000000000000000000000000000000000
|
102,816 | 15 Jan 2011, 14:26:07 |
0000000000038dee000000000000000000000000000000000000000000000000
|
104,832 | 27 Jan 2011, 08:16:11 |
000000000002fa29000000000000000000000000000000000000000000000000
|
106,848 | 08 Feb 2011, 04:53:20 |
0000000000028552000000000000000000000000000000000000000000000000
|
108,864 | 18 Feb 2011, 05:15:52 |
000000000001cc26000000000000000000000000000000000000000000000000
|
110,880 | 27 Feb 2011, 09:59:20 |
0000000000012dcd000000000000000000000000000000000000000000000000
|
112,896 | 09 Mar 2011, 15:25:55 |
000000000000dc31000000000000000000000000000000000000000000000000
|
114,912 | 25 Mar 2011, 02:39:45 |
000000000000f339000000000000000000000000000000000000000000000000
|
116,928 | 05 Apr 2011, 20:09:57 |
000000000000cbbd000000000000000000000000000000000000000000000000
|
118,944 | 18 Apr 2011, 07:49:36 |
000000000000b5ac000000000000000000000000000000000000000000000000
|
120,960 | 30 Apr 2011, 02:53:00 |
00000000000098fa000000000000000000000000000000000000000000000000
|
122,976 | 09 May 2011, 21:17:24 |
0000000000006a93b30000000000000000000000000000000000000000000000
|
124,992 | 18 May 2011, 22:04:47 |
00000000000044b9f20000000000000000000000000000000000000000000000
|
127,008 | 26 May 2011, 18:41:56 |
0000000000002694210000000000000000000000000000000000000000000000
|
129,024 | 06 Jun 2011, 12:25:05 |
0000000000001d932f0000000000000000000000000000000000000000000000
|
131,040 | 15 Jun 2011, 13:49:34 |
0000000000001321850000000000000000000000000000000000000000000000
|
133,056 | 24 Jun 2011, 11:45:23 |
0000000000000c2a120000000000000000000000000000000000000000000000
|
135,072 | 06 Jul 2011, 20:35:46 |
0000000000000abbcf0000000000000000000000000000000000000000000000
|
137,088 | 19 Jul 2011, 19:23:09 |
00000000000009ec040000000000000000000000000000000000000000000000
|
139,104 | 01 Aug 2011, 08:11:19 |
00000000000008e1e50000000000000000000000000000000000000000000000
|
141,120 | 15 Aug 2011, 23:44:54 |
000000000000094a860000000000000000000000000000000000000000000000
|
143,136 | 30 Aug 2011, 05:15:03 |
000000000000096fe30000000000000000000000000000000000000000000000
|
145,152 | 13 Sep 2011, 09:31:56 |
000000000000098ea50000000000000000000000000000000000000000000000
|
147,168 | 27 Sep 2011, 22:47:04 |
00000000000009ee5d0000000000000000000000000000000000000000000000
|
149,184 | 14 Oct 2011, 01:44:35 |
0000000000000b6d4b0000000000000000000000000000000000000000000000
|
151,200 | 31 Oct 2011, 03:42:14 |
0000000000000df0ca0000000000000000000000000000000000000000000000
|
153,216 | 14 Nov 2011, 06:56:10 |
0000000000000e119a0000000000000000000000000000000000000000000000
|
155,232 | 29 Nov 2011, 14:20:20 |
0000000000000f61b10000000000000000000000000000000000000000000000
|
157,248 | 12 Dec 2011, 19:42:35 |
0000000000000e86680000000000000000000000000000000000000000000000
|
159,264 | 26 Dec 2011, 18:43:25 |
0000000000000e76ba0000000000000000000000000000000000000000000000
|
161,280 | 08 Jan 2012, 18:26:16 |
0000000000000d69d70000000000000000000000000000000000000000000000
|
163,296 | 22 Jan 2012, 03:55:04 |
0000000000000cd43f0000000000000000000000000000000000000000000000
|
165,312 | 04 Feb 2012, 10:32:41 |
0000000000000c290b0000000000000000000000000000000000000000000000
|
167,328 | 18 Feb 2012, 11:24:15 |
0000000000000c309c0000000000000000000000000000000000000000000000
|
169,344 | 02 Mar 2012, 08:25:36 |
0000000000000b350c0000000000000000000000000000000000000000000000
|
171,360 | 16 Mar 2012, 08:09:54 |
0000000000000b32870000000000000000000000000000000000000000000000
|
173,376 | 29 Mar 2012, 05:41:47 |
0000000000000a507e0000000000000000000000000000000000000000000000
|
175,392 | 12 Apr 2012, 16:04:49 |
0000000000000aa1e30000000000000000000000000000000000000000000000
|
177,408 | 27 Apr 2012, 07:39:30 |
0000000000000b1ef70000000000000000000000000000000000000000000000
|
179,424 | 09 May 2012, 12:08:33 |
00000000000009ae020000000000000000000000000000000000000000000000
|
181,440 | 24 May 2012, 18:10:29 |
0000000000000a8b5f0000000000000000000000000000000000000000000000
|
183,456 | 07 Jun 2012, 20:05:25 |
0000000000000a98d60000000000000000000000000000000000000000000000
|
185,472 | 20 Jun 2012, 16:16:04 |
00000000000009b78a0000000000000000000000000000000000000000000000
|
187,488 | 04 Jul 2012, 11:37:21 |
0000000000000994310000000000000000000000000000000000000000000000
|
189,504 | 17 Jul 2012, 14:59:26 |
00000000000008fd2e0000000000000000000000000000000000000000000000
|
191,520 | 30 Jul 2012, 11:26:17 |
000000000000083cc90000000000000000000000000000000000000000000000
|
193,536 | 12 Aug 2012, 12:00:55 |
00000000000007a85e0000000000000000000000000000000000000000000000
|
195,552 | 25 Aug 2012, 01:46:39 |
00000000000006dfbe0000000000000000000000000000000000000000000000
|
197,568 | 06 Sep 2012, 18:10:37 |
000000000000063a380000000000000000000000000000000000000000000000
|
199,584 | 19 Sep 2012, 22:14:11 |
00000000000005db8b0000000000000000000000000000000000000000000000
|
201,600 | 03 Oct 2012, 01:11:00 |
000000000000057e080000000000000000000000000000000000000000000000
|
203,616 | 16 Oct 2012, 22:56:08 |
0000000000000575ef0000000000000000000000000000000000000000000000
|
205,632 | 30 Oct 2012, 00:16:35 |
0000000000000513c50000000000000000000000000000000000000000000000
|
207,648 | 12 Nov 2012, 17:59:46 |
00000000000004faeb0000000000000000000000000000000000000000000000
|
209,664 | 26 Nov 2012, 11:10:29 |
00000000000004e0ea0000000000000000000000000000000000000000000000
|
211,680 | 10 Dec 2012, 18:03:33 |
00000000000004fa620000000000000000000000000000000000000000000000
|
213,696 | 26 Dec 2012, 14:05:40 |
00000000000005a16b0000000000000000000000000000000000000000000000
|
215,712 | 08 Jan 2013, 10:40:34 |
0000000000000529b10000000000000000000000000000000000000000000000
|
217,728 | 23 Jan 2013, 18:41:27 |
00000000000005a6b10000000000000000000000000000000000000000000000
|
219,744 | 05 Feb 2013, 11:19:06 |
000000000000051f3c0000000000000000000000000000000000000000000000
|
221,760 | 18 Feb 2013, 00:47:50 |
00000000000004985c0000000000000000000000000000000000000000000000
|
223,776 | 01 Mar 2013, 17:42:44 |
00000000000003d74b0000000000000000000000000000000000000000000000
|
225,792 | 14 Mar 2013, 08:32:26 |
0000000000000375fa0000000000000000000000000000000000000000000000
|
227,808 | 24 Mar 2013, 12:00:25 |
00000000000002816e0000000000000000000000000000000000000000000000
|
229,824 | 05 Apr 2013, 17:40:43 |
000000000000022fbe0000000000000000000000000000000000000000000000
|
231,840 | 17 Apr 2013, 17:02:14 |
00000000000001de940000000000000000000000000000000000000000000000
|
233,856 | 30 Apr 2013, 04:34:31 |
00000000000001aa3d0000000000000000000000000000000000000000000000
|
235,872 | 12 May 2013, 19:15:23 |
000000000000017fe90000000000000000000000000000000000000000000000
|
237,888 | 25 May 2013, 16:35:46 |
0000000000000161640000000000000000000000000000000000000000000000
|
239,904 | 05 Jun 2013, 14:25:18 |
0000000000000113370000000000000000000000000000000000000000000000
|
241,920 | 16 Jun 2013, 21:37:34 |
00000000000000de150000000000000000000000000000000000000000000000
|
243,936 | 29 Jun 2013, 14:22:05 |
00000000000000c94e0000000000000000000000000000000000000000000000
|
245,952 | 11 Jul 2013, 00:22:43 |
00000000000000a4290000000000000000000000000000000000000000000000
|
247,968 | 22 Jul 2013, 17:57:07 |
0000000000000089680000000000000000000000000000000000000000000000
|
249,984 | 03 Aug 2013, 10:51:55 |
0000000000000072dbf200000000000000000000000000000000000000000000
|
252,000 | 13 Aug 2013, 18:11:30 |
0000000000000054873200000000000000000000000000000000000000000000
|
254,016 | 24 Aug 2013, 14:08:39 |
0000000000000041525700000000000000000000000000000000000000000000
|
256,032 | 04 Sep 2013, 04:21:00 |
0000000000000031679c00000000000000000000000000000000000000000000
|
258,048 | 14 Sep 2013, 23:44:08 |
0000000000000026222200000000000000000000000000000000000000000000
|
260,064 | 25 Sep 2013, 14:09:06 |
000000000000001cdc2000000000000000000000000000000000000000000000
|
262,080 | 06 Oct 2013, 14:42:32 |
0000000000000016b0ca00000000000000000000000000000000000000000000
|
264,096 | 16 Oct 2013, 12:16:28 |
00000000000000100ab600000000000000000000000000000000000000000000
|
266,112 | 26 Oct 2013, 02:24:32 |
000000000000000afc8500000000000000000000000000000000000000000000
|
268,128 | 05 Nov 2013, 19:52:03 |
000000000000000867f300000000000000000000000000000000000000000000
|
270,144 | 17 Nov 2013, 14:44:59 |
00000000000000070bfb00000000000000000000000000000000000000000000
|
272,160 | 29 Nov 2013, 16:30:48 |
0000000000000006124200000000000000000000000000000000000000000000
|
274,176 | 10 Dec 2013, 14:11:26 |
0000000000000004ba6e00000000000000000000000000000000000000000000
|
276,192 | 21 Dec 2013, 09:11:52 |
0000000000000003a30c00000000000000000000000000000000000000000000
|
278,208 | 02 Jan 2014, 00:58:38 |
0000000000000003071f00000000000000000000000000000000000000000000
|
280,224 | 13 Jan 2014, 03:20:20 |
0000000000000002666600000000000000000000000000000000000000000000
|
282,240 | 24 Jan 2014, 13:28:46 |
0000000000000001f52c00000000000000000000000000000000000000000000
|
284,256 | 05 Feb 2014, 07:14:16 |
0000000000000001a36e00000000000000000000000000000000000000000000
|
286,272 | 17 Feb 2014, 00:43:59 |
00000000000000015f5300000000000000000000000000000000000000000000
|
288,288 | 28 Feb 2014, 12:29:45 |
0000000000000001202600000000000000000000000000000000000000000000
|
290,304 | 13 Mar 2014, 02:12:44 |
000000000000000102b100000000000000000000000000000000000000000000
|
292,320 | 24 Mar 2014, 23:30:32 |
0000000000000000db9900000000000000000000000000000000000000000000
|
294,336 | 05 Apr 2014, 10:41:18 |
0000000000000000b3aa00000000000000000000000000000000000000000000
|
296,352 | 17 Apr 2014, 17:27:26 |
00000000000000009d8c00000000000000000000000000000000000000000000
|
298,368 | 29 Apr 2014, 22:39:35 |
0000000000000000896c00000000000000000000000000000000000000000000
|
300,384 | 12 May 2014, 14:18:31 |
00000000000000007c3053000000000000000000000000000000000000000000
|
302,400 | 24 May 2014, 10:52:30 |
0000000000000000692842000000000000000000000000000000000000000000
|
304,416 | 05 Jun 2014, 21:49:53 |
00000000000000005d859a000000000000000000000000000000000000000000
|
306,432 | 18 Jun 2014, 03:14:40 |
000000000000000051aba2000000000000000000000000000000000000000000
|
308,448 | 29 Jun 2014, 08:12:36 |
0000000000000000415fd1000000000000000000000000000000000000000000
|
310,464 | 12 Jul 2014, 22:58:14 |
00000000000000003f6be6000000000000000000000000000000000000000000
|
312,480 | 25 Jul 2014, 21:51:32 |
00000000000000003aaea2000000000000000000000000000000000000000000
|
314,496 | 08 Aug 2014, 05:01:52 |
000000000000000037ba62000000000000000000000000000000000000000000
|
316,512 | 19 Aug 2014, 19:11:58 |
00000000000000002e1c58000000000000000000000000000000000000000000
|
318,528 | 31 Aug 2014, 23:19:12 |
00000000000000002815ee000000000000000000000000000000000000000000
|
320,544 | 13 Sep 2014, 20:08:16 |
000000000000000024dbe9000000000000000000000000000000000000000000
|
322,560 | 25 Sep 2014, 21:21:20 |
00000000000000001fb893000000000000000000000000000000000000000000
|
324,576 | 09 Oct 2014, 18:04:26 |
00000000000000001f6973000000000000000000000000000000000000000000
|
326,592 | 23 Oct 2014, 09:09:53 |
00000000000000001e8dc0000000000000000000000000000000000000000000
|
328,608 | 05 Nov 2014, 02:30:31 |
00000000000000001bc330000000000000000000000000000000000000000000
|
330,624 | 18 Nov 2014, 21:12:04 |
00000000000000001b4861000000000000000000000000000000000000000000
|
332,640 | 02 Dec 2014, 23:41:45 |
00000000000000001b7b74000000000000000000000000000000000000000000
|
334,656 | 17 Dec 2014, 04:37:04 |
00000000000000001bdd7c000000000000000000000000000000000000000000
|
336,672 | 30 Dec 2014, 18:53:08 |
00000000000000001b0dca000000000000000000000000000000000000000000
|
338,688 | 12 Jan 2015, 17:34:33 |
000000000000000019012f000000000000000000000000000000000000000000
|
340,704 | 27 Jan 2015, 15:35:46 |
00000000000000001aa3c0000000000000000000000000000000000000000000
|
342,720 | 09 Feb 2015, 15:40:15 |
000000000000000018bb87000000000000000000000000000000000000000000
|
344,736 | 22 Feb 2015, 23:48:57 |
0000000000000000178d3a000000000000000000000000000000000000000000
|
346,752 | 08 Mar 2015, 18:42:45 |
0000000000000000172ec0000000000000000000000000000000000000000000
|
348,768 | 22 Mar 2015, 23:53:31 |
00000000000000001788f2000000000000000000000000000000000000000000
|
350,784 | 05 Apr 2015, 05:22:25 |
0000000000000000163c71000000000000000000000000000000000000000000
|
352,800 | 19 Apr 2015, 18:25:06 |
00000000000000001717f0000000000000000000000000000000000000000000
|
354,816 | 03 May 2015, 18:22:21 |
00000000000000001713dd000000000000000000000000000000000000000000
|
356,832 | 17 May 2015, 10:27:13 |
00000000000000001686f5000000000000000000000000000000000000000000
|
358,848 | 31 May 2015, 19:06:25 |
0000000000000000171a8b000000000000000000000000000000000000000000
|
360,864 | 14 Jun 2015, 04:56:03 |
0000000000000000162043000000000000000000000000000000000000000000
|
362,880 | 28 Jun 2015, 07:07:26 |
000000000000000016418e000000000000000000000000000000000000000000
|
364,896 | 11 Jul 2015, 20:24:46 |
00000000000000001586c8000000000000000000000000000000000000000000
|
366,912 | 25 Jul 2015, 12:44:45 |
0000000000000000150815000000000000000000000000000000000000000000
|
368,928 | 08 Aug 2015, 10:15:30 |
000000000000000014dd04000000000000000000000000000000000000000000
|
370,944 | 22 Aug 2015, 00:49:43 |
00000000000000001443c4000000000000000000000000000000000000000000
|
372,960 | 04 Sep 2015, 09:05:07 |
0000000000000000134dc1000000000000000000000000000000000000000000
|
374,976 | 17 Sep 2015, 19:50:04 |
00000000000000001287ba000000000000000000000000000000000000000000
|
376,992 | 01 Oct 2015, 11:53:10 |
0000000000000000121472000000000000000000000000000000000000000000
|
379,008 | 15 Oct 2015, 11:32:31 |
0000000000000000120f14000000000000000000000000000000000000000000
|
381,024 | 29 Oct 2015, 04:25:06 |
000000000000000011a954000000000000000000000000000000000000000000
|
383,040 | 11 Nov 2015, 10:11:32 |
000000000000000010b289000000000000000000000000000000000000000000
|
385,056 | 24 Nov 2015, 02:34:22 |
00000000000000000f1e76000000000000000000000000000000000000000000
|
387,072 | 06 Dec 2015, 23:30:52 |
00000000000000000de64f000000000000000000000000000000000000000000
|
389,088 | 18 Dec 2015, 20:08:09 |
00000000000000000bc409000000000000000000000000000000000000000000
|
391,104 | 31 Dec 2015, 10:42:42 |
00000000000000000a9591000000000000000000000000000000000000000000
|
393,120 | 13 Jan 2016, 06:39:38 |
000000000000000009b31b000000000000000000000000000000000000000000
|
395,136 | 26 Jan 2016, 12:19:05 |
00000000000000000928f0000000000000000000000000000000000000000000
|
397,152 | 07 Feb 2016, 04:12:40 |
000000000000000007a114000000000000000000000000000000000000000000
|
399,168 | 19 Feb 2016, 12:34:16 |
000000000000000006b99f000000000000000000000000000000000000000000
|
401,184 | 04 Mar 2016, 23:25:56 |
000000000000000006f0a8000000000000000000000000000000000000000000
|
403,200 | 18 Mar 2016, 09:07:48 |
000000000000000006a4c3000000000000000000000000000000000000000000
|
405,216 | 01 Apr 2016, 06:34:35 |
00000000000000000696f4000000000000000000000000000000000000000000
|
407,232 | 14 Apr 2016, 08:25:41 |
000000000000000006274b000000000000000000000000000000000000000000
|
409,248 | 28 Apr 2016, 08:28:30 |
0000000000000000062776000000000000000000000000000000000000000000
|
411,264 | 11 May 2016, 05:34:26 |
000000000000000005a8fa000000000000000000000000000000000000000000
|
413,280 | 24 May 2016, 21:02:46 |
0000000000000000058436000000000000000000000000000000000000000000
|
415,296 | 08 Jun 2016, 02:41:58 |
0000000000000000059ba0000000000000000000000000000000000000000000
|
417,312 | 21 Jun 2016, 05:18:58 |
0000000000000000053fd6000000000000000000000000000000000000000000
|
419,328 | 04 Jul 2016, 23:16:01 |
00000000000000000526fd000000000000000000000000000000000000000000
|
421,344 | 18 Jul 2016, 23:22:42 |
0000000000000000052669000000000000000000000000000000000000000000
|
423,360 | 02 Aug 2016, 18:50:42 |
0000000000000000057228000000000000000000000000000000000000000000
|
425,376 | 15 Aug 2016, 18:59:14 |
0000000000000000050edc000000000000000000000000000000000000000000
|
427,392 | 29 Aug 2016, 14:11:01 |
000000000000000004fb08000000000000000000000000000000000000000000
|
429,408 | 12 Sep 2016, 06:39:07 |
000000000000000004de5e000000000000000000000000000000000000000000
|
431,424 | 25 Sep 2016, 09:16:55 |
0000000000000000048ed4000000000000000000000000000000000000000000
|
433,440 | 08 Oct 2016, 10:53:30 |
00000000000000000440c4000000000000000000000000000000000000000000
|
435,456 | 22 Oct 2016, 18:02:58 |
00000000000000000455d2000000000000000000000000000000000000000000
|
437,472 | 05 Nov 2016, 16:46:58 |
0000000000000000045174000000000000000000000000000000000000000000
|
439,488 | 18 Nov 2016, 08:30:15 |
000000000000000003e6d4000000000000000000000000000000000000000000
|
441,504 | 02 Dec 2016, 02:46:26 |
000000000000000003d589000000000000000000000000000000000000000000
|
443,520 | 15 Dec 2016, 01:28:33 |
0000000000000000038b85000000000000000000000000000000000000000000
|
445,536 | 28 Dec 2016, 17:40:55 |
00000000000000000375ff000000000000000000000000000000000000000000
|
447,552 | 10 Jan 2017, 22:40:52 |
0000000000000000034379000000000000000000000000000000000000000000
|
449,568 | 22 Jan 2017, 22:52:52 |
000000000000000002cc47000000000000000000000000000000000000000000
|
451,584 | 04 Feb 2017, 23:38:49 |
0000000000000000029ab9000000000000000000000000000000000000000000
|
453,600 | 18 Feb 2017, 09:38:26 |
0000000000000000027e93000000000000000000000000000000000000000000
|
455,616 | 03 Mar 2017, 19:04:46 |
00000000000000000262df000000000000000000000000000000000000000000
|
457,632 | 17 Mar 2017, 08:36:15 |
0000000000000000024fb1000000000000000000000000000000000000000000
|
459,648 | 30 Mar 2017, 16:39:08 |
000000000000000002335a000000000000000000000000000000000000000000
|
461,664 | 13 Apr 2017, 02:59:50 |
0000000000000000021c73000000000000000000000000000000000000000000
|
463,680 | 27 Apr 2017, 02:20:01 |
0000000000000000021b3e000000000000000000000000000000000000000000
|
465,696 | 10 May 2017, 03:40:48 |
000000000000000001f6a7000000000000000000000000000000000000000000
|
467,712 | 23 May 2017, 07:29:52 |
000000000000000001d854000000000000000000000000000000000000000000
|
469,728 | 04 Jun 2017, 14:35:07 |
0000000000000000019eaf000000000000000000000000000000000000000000
|
471,744 | 17 Jun 2017, 23:18:53 |
0000000000000000018b7e000000000000000000000000000000000000000000
|
473,760 | 02 Jul 2017, 00:47:17 |
0000000000000000018d30000000000000000000000000000000000000000000
|
475,776 | 14 Jul 2017, 08:45:42 |
0000000000000000015ddc000000000000000000000000000000000000000000
|
477,792 | 27 Jul 2017, 11:03:54 |
0000000000000000014735000000000000000000000000000000000000000000
|
479,808 | 09 Aug 2017, 12:36:50 |
00000000000000000130e0000000000000000000000000000000000000000000
|
481,824 | 24 Aug 2017, 01:57:37 |
0000000000000000013ce9000000000000000000000000000000000000000000
|
483,840 | 06 Sep 2017, 13:23:15 |
000000000000000001310b000000000000000000000000000000000000000000
|
485,856 | 18 Sep 2017, 06:31:16 |
000000000000000000ff18000000000000000000000000000000000000000000
|
487,872 | 02 Oct 2017, 00:27:46 |
000000000000000000fa73000000000000000000000000000000000000000000
|
489,888 | 15 Oct 2017, 04:05:02 |
000000000000000000eb30000000000000000000000000000000000000000000
|
491,904 | 26 Oct 2017, 16:52:42 |
000000000000000000c1bd000000000000000000000000000000000000000000
|
493,920 | 10 Nov 2017, 15:13:51 |
000000000000000000ce4b000000000000000000000000000000000000000000
|
495,936 | 24 Nov 2017, 19:53:16 |
000000000000000000d0f6000000000000000000000000000000000000000000
|
497,952 | 06 Dec 2017, 16:23:21 |
000000000000000000b0ed000000000000000000000000000000000000000000
|
499,968 | 18 Dec 2017, 13:55:20 |
0000000000000000009645000000000000000000000000000000000000000000
|
501,984 | 01 Jan 2018, 03:56:10 |
00000000000000000091c1000000000000000000000000000000000000000000
|
504,000 | 13 Jan 2018, 07:12:34 |
0000000000000000007e578c0000000000000000000000000000000000000000
|
506,016 | 25 Jan 2018, 06:48:20 |
0000000000000000006c21460000000000000000000000000000000000000000
|
508,032 | 06 Feb 2018, 23:08:07 |
00000000000000000061e9f80000000000000000000000000000000000000000
|
510,048 | 20 Feb 2018, 08:20:59 |
0000000000000000005d97dc0000000000000000000000000000000000000000
|
512,064 | 05 Mar 2018, 04:21:18 |
0000000000000000005589a30000000000000000000000000000000000000000
|
514,080 | 18 Mar 2018, 11:40:18 |
000000000000000000514a490000000000000000000000000000000000000000
|
516,096 | 01 Apr 2018, 07:05:57 |
000000000000000000502ab70000000000000000000000000000000000000000
|
518,112 | 14 Apr 2018, 02:28:52 |
00000000000000000049500d0000000000000000000000000000000000000000
|
520,128 | 27 Apr 2018, 11:24:13 |
00000000000000000045fb530000000000000000000000000000000000000000
|
522,144 | 11 May 2018, 01:54:15 |
00000000000000000043eca90000000000000000000000000000000000000000
|
524,160 | 24 May 2018, 13:20:53 |
000000000000000000415a490000000000000000000000000000000000000000
|
526,176 | 05 Jun 2018, 18:18:06 |
00000000000000000038f8410000000000000000000000000000000000000000
|
528,192 | 19 Jun 2018, 09:20:45 |
000000000000000000376f560000000000000000000000000000000000000000
|
530,208 | 02 Jul 2018, 15:34:21 |
000000000000000000347a280000000000000000000000000000000000000000
|
532,224 | 17 Jul 2018, 03:50:49 |
000000000000000000365a170000000000000000000000000000000000000000
|
534,240 | 29 Jul 2018, 08:19:31 |
0000000000000000002f4f7b0000000000000000000000000000000000000000
|
536,256 | 11 Aug 2018, 09:40:59 |
0000000000000000002c0da70000000000000000000000000000000000000000
|
538,272 | 24 Aug 2018, 16:50:31 |
00000000000000000029d72d0000000000000000000000000000000000000000
|
540,288 | 07 Sep 2018, 03:14:39 |
0000000000000000002819a10000000000000000000000000000000000000000
|
542,304 | 20 Sep 2018, 21:15:39 |
000000000000000000275a1f0000000000000000000000000000000000000000
|
544,320 | 04 Oct 2018, 07:49:22 |
00000000000000000025c1910000000000000000000000000000000000000000
|
546,336 | 18 Oct 2018, 20:37:47 |
000000000000000000272fbd0000000000000000000000000000000000000000
|
548,352 | 01 Nov 2018, 20:54:16 |
000000000000000000272d920000000000000000000000000000000000000000
|
550,368 | 16 Nov 2018, 23:51:24 |
0000000000000000002a4e2f0000000000000000000000000000000000000000
|
552,384 | 03 Dec 2018, 11:59:28 |
00000000000000000031d97c0000000000000000000000000000000000000000
|
554,400 | 18 Dec 2018, 23:32:45 |
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2. How is the target calculated?
The target for the first block was set at:
00000000ffff0000000000000000000000000000000000000000000000000000
Block 0
This initial (and maximum) target value is hard-coded in to the source code of every bitcoin node.1 It was probably best-guess by Satoshi at what be a good starting point for a difficult-enough target that would result in a 10-minute interval between new blocks.
After every 2016 blocks, each node will look at the time between the last 2016 blocks and work out if they were being mined faster or slower than 10 minutes on average.
Each block contains a timestamp in its block header. This timestamp is in Unix time, which is the number of seconds since 01 January 1970.
If blocks during this period were being mined faster than every 10 minutes, the target will adjust downwards to make it more difficult to get below the target for the next period of blocks.
Conversely, if blocks were being mined slower than every 10 minutes, the target will adjust upwards to make is easier to get below the target for the next period of blocks.
As a result, each node regularly recalculates the target to enforce a 10-minute interval between new blocks, even as miners join and leave the network over time.
Try it! - Target Recalculator
See the code at the bottom of the page for a real example.
What causes blocks to be mined faster or slower than every 10 minutes?
Well, first of all, mining is unpredictable, so you never know when a miner is going to find the next block with a block hash below the current target.
Secondly (and most importantly), miners can join and leave the network at any time, which affects the likelihood of new blocks being mined within 10-minute periods. The more miners there are on the network, the more hashing there is taking place, and the more likely it is a new block will be mined in under 10 minutes.
3. Do all nodes share the same target?
Each node on the network operates independently, so there is no “single target value” being sent around the network.
However, because all nodes adopt the longest chain of blocks as their blockchain, they will each end up calculating the same target as everyone else, so effectively all nodes end up sharing the same current target.
For example, when you run bitcoin for the first time, your node will perform the initial block download and calculate the targets as it goes. And because you’re receiving the same blocks as everyone else, you will end up calculating the same current target too.
Furthermore, all nodes continually share the same view of the blockchain (as they will always adopt the longest available chain of blocks). Therefore, nodes will also continually calculate the same target value as each new block is mined.
As a result, despite the fact nodes calculate the target independently, they each share the same blockchain and calculate the same target value as each other.
Everyone does the same calculation with the same chain data, so they all get the same result at the same link in the chain. – Satoshi Nakamoto
4. Why does bitcoin use a target?
The target regulates the speed at which new blocks are added on to the blockchain.
This has two benefits:
i. It gives blocks time to propagate across the network.
It’s ideal to have miners working on extending the same chain of blocks as much as possible. For this to work, we need to allow time for new blocks to propagate across the network before the next block gets mined.
If blocks are being mined faster than they can be broadcast across the network, it will result in miners regularly building competing chains. Only one of these will become the longest, so some miners will end up wasting energy working to build on top of a competing chain only for it to be left behind due to a chain reorganisation.
Therefore, this time delay between blocks allows them to propagate the network so that more miners can adopt the longest available chain, which concentrates the network’s mining power on extending the same chain of blocks.
If broadcasts turn out to be slower in practice than expected, the target time between blocks may have to be increased to avoid wasting resources. We want blocks to usually propagate in much less time than it takes to generate them, otherwise nodes would spend too much time working on obsolete blocks. – Satoshi Nakamoto
ii. A consistent issuance of new bitcoins.
Bitcoin is a currency, so having a fixed rate of new bitcoins introduced in to the system provides stability.

Coins have to get initially distributed somehow, and a constant rate seems like the best formula. – Satoshi Nakamoto
5. Why 10 minutes between blocks?
I don’t think anyone knows why 10 minutes exactly was chosen, except for Satoshi.
My guess is that it seems like a long-enough time to allow blocks to propagate around the network (to minimize chain reorganisations), and short-enough so that you do not have to wait too long for a new transaction to get mined on to the blockchain. And 10 is a nice round number.
6. Where can you find the target?
The target gets stored in the bits field in the block header of every block.

Commands
bitcoin-cli getblocktemplate
The is the simplest way to get the current target. When you request a block template for mining it also returns the current target:
$ bitcoin-cli getblocktemplate '{"rules": ["segwit"]}' | grep target
"target": "00000000000000000004e90f0000000000000000000000000000000000000000",
bitcoin-cli getdifficulty
Similarly you can just ask for the current difficulty, which you can then convert to the target:
$ bitcoin-cli getdifficulty
67957790298898
bitcoin-cli getblockheader
Alternatively, as mentioned, the target at the time of mining is stored in every block header in the bits format (which you can convert to a full target value):
$ bitcoin-cli getblockheader 000000000000000002e9533a4fe03bb251b3fdb30ffaa384aad133b7fae594cf
{
"hash": "000000000000000002e9533a4fe03bb251b3fdb30ffaa384aad133b7fae594cf",
"confirmations": 207763,
"height": 401184,
"version": 4,
"versionHex": "00000004",
"merkleroot": "b4afa0502a55fdfa4a5cda6ea2bc546ba527d276ea9c7e848b8cd478cd9b6607",
"time": 1457133956,
"mediantime": 1457132303,
"nonce": 3778923481,
"bits": "1806f0a8",
"difficulty": 158427203767.3917,
"chainwork": "00000000000000000000000000000000000000000012da32364c8f47d519604d",
"nTx": 845,
"previousblockhash": "000000000000000003c4a4d9c62b3a7f4893afe14eef8a6a377229d23ad4b1ea",
"nextblockhash": "00000000000000000037ab74c8db9b7a9d7de039210d8eafaeb44ba35adfb624"
}
Tip: You can get the target for the top block in the chain with: $ bitcoin-cli getblockheader $(bitcoin-cli getblockhash $(bitcoin-cli getblockcount))
Note: This will give you the target for that block, and not necessarily the current target being used for the next block.
Code
Here’s some example Ruby code for calculating new target values. This code works out the new target for block 403,200, using the timestamps from blocks 401,184 and 403,199.
# 403,200 - NEW TARGET
# 403,199 | last block
# |
# |
# |
# 401,184 - NEW TARGET | first block (target = 0x000000000000000006f0a8000000000000000000000000000000000000000000)
# 1. Get the timestamps for the first and last block in the target adjustment period
1457133956 # block 401,184
first = 1458291885 # block 403,199
last =
# 2. Work out the ratio of the actual time against the expected time
# 1157929 (number of seconds between first and last block)
actual = last - first 2016 * 10 * 60 # 1209600 (number of seconds expected between 2016 blocks)
expected =
ratio = actual.to_f / expected.to_f
# 3. Limit the adjustment by a factor of 4 (to prevent massive changes from one target to the next)
0.25 if ratio < 0.25
ratio = 4 if ratio > 4
ratio =
# 4. Multiply the current target by this ratio to get the new target
0x000000000000000006f0a8000000000000000000000000000000000000000000
current_target =
new_target = (current_target * ratio)
# 5. Don't let the target go above the maximum target
0x00000000ffff0000000000000000000000000000000000000000000000000000
max_target = if new_target > max_target
new_target = max_target
# 5. Truncate the target, because the official target is the truncated "bits" format stored in the block header
# This code is a bit rough, because it's working with strings when I should really be working with actual bytes.
16) # convert from decimal to hexadecimal
new_target = new_target.to_i.to_s(2 != 0 ? '0' + new_target : new_target # make sure it's an even number of characters (i.e. bytes)
new_target = new_target.size % /../).each_with_index.map { |byte, i| byte = i >= 3 ? "00" : byte }.join # set all bytes apart from first 3 to zeros
truncated = new_target.scan(# e.g. 6a4c316c01f354000000000000000000000000000000000 <- full precision
# e.g. 6a4c3000000000000000000000000000000000000000000 <- official target
# 6. Display the full target (with leading zeros)
64, '0')
target = truncated.rjust(
puts target# 000000000000000006a4c3000000000000000000000000000000000000000000
Tip: You can get the timestamp for a block with bitcoin-cli getblockheader <hash>
(and you can get the block hash for a block at a specific height with bitcoin-cli getblockhash <height>
).
Official Target: The official target is the truncated target that gets stored in the block header (in the bits field), so it’s not actually the full-precision target that you get after adjusting the previous one.
Off-by-one: You may notice that new target is calculated using the time across 2015 blocks (and not across 2016 as you would expect). This is an implementation error in the code that still exists today.
Factor of 4: Target adjustments are limited by a factor of 4 to prevent overly-large adjustments from one target to the next.
Links
pow.cpp
- The functionCalculateNextWorkRequired()
adjusts the target.chainparams.cpp
- The original target value (and also the highest possible target value) is set byconsensus.powLimit
- https://en.bitcoin.it/wiki/Target
- How is the target in Bitcoin set? Who does this? (bitcoin.stackexchange.com)
- Why not retarget on every block? (bitcoin.stackexchange.com)
- Why was the target block time chosen to be 10 minutes?
- https://bitcoin.stackexchange.com/questions/1511/gaming-the-off-by-one-bug-difficulty-re-target-based-on-2015-instead-of-2016)
Thanks
- Thanks to David Harding for pointing out that you can get the target directly from bitcoind with
bitcoin-cli getblocktemplate
.