Difficulty - Revision history

WikiR: Removed broken link (vnbitcoin.org) and low-quality, link-stuffed content (bitcoinmining.com).

2025-02-22T13:37:00Z

Removed broken link (vnbitcoin.org) and low-quality, link-stuffed content (bitcoinmining.com).

← Older revision		Revision as of 13:37, 22 February 2025
Line 167:		Line 167:
	* Visit a calculator or perform the maths yourself,		* Visit a calculator or perform the maths yourself,
	** http://www.alloscomp.com/bitcoin/calculator.php		** http://www.alloscomp.com/bitcoin/calculator.php
	** http://www.vnbitcoin.org/bitcoincalculator.php
	** https://bitknock.com/calculator		** https://bitknock.com/calculator
	**https://99bitcoins.com/bitcoin-mining-calculator		**https://99bitcoins.com/bitcoin-mining-calculator
Line 179:		Line 178:

	* [https://docs.google.com/spreadsheet/ccc?key=0AiFMBvXvL2dtdEZkR2J4eU5rS3B4ei1iUmJxSWNlQ0E Bitcoin Difficulty History]		* [https://docs.google.com/spreadsheet/ccc?key=0AiFMBvXvL2dtdEZkR2J4eU5rS3B4ei1iUmJxSWNlQ0E Bitcoin Difficulty History]
	* [https://www.bitcoinmining.com/what-is-bitcoin-mining-difficulty/ What is Bitcoin Mining Difficulty?]
	* See also: [[target]]		* See also: [[target]]

Nkuttler: Remove broken link and add alternative, not numeric though

2023-12-30T15:07:54Z

Remove broken link and add alternative, not numeric though

← Older revision		Revision as of 15:07, 30 December 2023
Line 109:		Line 109:

	=== What is the current difficulty? ===		=== What is the current difficulty? ===
	~~[http://blockexplorer.com/q/getdifficulty Current difficulty], as output by Bitcoin's getDifficulty.~~

	[http://bitcoin.sipa.be Graphs]		[http://bitcoin.sipa.be Graphs]

			[https://mempool.space/graphs/mining/hashrate-difficulty More graphs]

	=== What is the maximum difficulty? ===		=== What is the maximum difficulty? ===

NotATether: add faster diff calculation mehtod https://bitcointalk.org/index.php?topic=5322560.msg57500778#msg57500778

2021-07-28T00:59:00Z

add faster diff calculation mehtod https://bitcointalk.org/index.php?topic=5322560.msg57500778#msg57500778

@@ Line 77: / Line 77: @@
+}
 </source>
 To see the math to go from the normal difficulty calculations (which require large big ints bigger than the space in any normal integer) to the calculation above, here's some python:
@@ Line 92: / Line 93: @@
 print l(0x00ffff / float(0x0404cb)) + (8*(0x1d - 3))*l(2) - (8*(0x1b - 3))*l(2)
 print l(0x00ffff / float(0x0404cb)) + (0x1d - 0x1b)*l(2**8)
 </source>

Belcher: Add link to good reddit discussion

2021-05-13T13:58:23Z

Add link to good reddit discussion

← Older revision		Revision as of 13:58, 13 May 2021
Line 156:		Line 156:
	**https://99bitcoins.com/bitcoin-mining-calculator		**https://99bitcoins.com/bitcoin-mining-calculator
	* Remember it's just probability! There are no guarantees you will win every N days.		* Remember it's just probability! There are no guarantees you will win every N days.

			== Why is bitcoin not designed to update the difficulty more frequently? ==

			Discussion: https://old.reddit.com/r/Bitcoin/comments/mtugta/mentor_monday_april_19_2021_ask_all_your_bitcoin/gv86j6b/?context=5

	==Related Links==		==Related Links==

Leonafrica: Corrected spelling (practive -> practice)

2019-12-17T12:06:59Z

Corrected spelling (practive -> practice)

← Older revision		Revision as of 12:06, 17 December 2019
Line 27:		Line 27:
	0x0404cb * 2*(8(0x1b - 3)) = 0x00000000000404CB000000000000000000000000000000000000000000000000		0x0404cb * 2*(8(0x1b - 3)) = 0x00000000000404CB000000000000000000000000000000000000000000000000

	Note that this packed format contains a sign bit in the 24th bit, and for example the negation of the above target would be 0x1b<b>8</b>404cb in packed format. Since targets are never negative in ~~practive~~, however, this means the largest legal value for the lower 24 bits is 0x7fffff. Additionally, 0x008000 is the smallest legal value for the lower 24 bits since targets are always stored with the lowest possible exponent.		Note that this packed format contains a sign bit in the 24th bit, and for example the negation of the above target would be 0x1b<b>8</b>404cb in packed format. Since targets are never negative in practice, however, this means the largest legal value for the lower 24 bits is 0x7fffff. Additionally, 0x008000 is the smallest legal value for the lower 24 bits since targets are always stored with the lowest possible exponent.

	===How is difficulty calculated? What is the difference between bdiff and pdiff?===		===How is difficulty calculated? What is the difference between bdiff and pdiff?===

MarkBLundeberg: expand on target signedness / byte order

2019-11-25T05:11:52Z

expand on target signedness / byte order

← Older revision		Revision as of 05:11, 25 November 2019
Line 24:		Line 24:
	===How is difficulty stored in blocks?===		===How is difficulty stored in blocks?===

	Each block stores a packed representation (called "Bits") for its actual hexadecimal [[target]]. The target can be derived from it via a predefined formula. For example, if the packed target in the block is 0x1b0404cb, the hexadecimal target is		Each block stores a packed representation (called "Bits") for its actual hexadecimal [[target]]. The target can be derived from it via a predefined formula. For example, if the packed target in the block is 0x1b0404cb (stored in little-endian order: <code>cb 04 04 1b</code>), the hexadecimal target is
	0x0404cb * 2*(8(0x1b - 3)) = 0x00000000000404CB000000000000000000000000000000000000000000000000		0x0404cb * 2*(8(0x1b - 3)) = 0x00000000000404CB000000000000000000000000000000000000000000000000

	Note that the ~~0x0404cb value is a signed value~~ in ~~this~~ format. ~~The~~ largest legal value for ~~this field~~ is 0x7fffff. ~~To make a larger value you must shift it down one full byte. Also~~ 0x008000 is the smallest ~~positive valid~~ value.		Note that this packed format contains a sign bit in the 24th bit, and for example the negation of the above target would be 0x1b<b>8</b>404cb in packed format. Since targets are never negative in practive, however, this means the largest legal value for the lower 24 bits is 0x7fffff. Additionally, 0x008000 is the smallest legal value for the lower 24 bits since targets are always stored with the lowest possible exponent.

	===How is difficulty calculated? What is the difference between bdiff and pdiff?===		===How is difficulty calculated? What is the difference between bdiff and pdiff?===

ChupaChup: Added 99Bitcoins' mining calculator to resources

2017-04-12T08:56:33Z

Added 99Bitcoins' mining calculator to resources

← Older revision		Revision as of 08:56, 12 April 2017
Line 154:		Line 154:
	** http://www.vnbitcoin.org/bitcoincalculator.php		** http://www.vnbitcoin.org/bitcoincalculator.php
	** https://bitknock.com/calculator		** https://bitknock.com/calculator
			**https://99bitcoins.com/bitcoin-mining-calculator
	* Remember it's just probability! There are no guarantees you will win every N days.		* Remember it's just probability! There are no guarantees you will win every N days.

Anduck: removed http://blockexplorer.com/q/estimate - not working link

2016-04-09T12:32:20Z

removed http://blockexplorer.com/q/estimate - not working link

← Older revision		Revision as of 12:32, 9 April 2016
Line 96:		Line 96:
	=== What is the current difficulty? ===		=== What is the current difficulty? ===
	[http://blockexplorer.com/q/getdifficulty Current difficulty], as output by Bitcoin's getDifficulty.		[http://blockexplorer.com/q/getdifficulty Current difficulty], as output by Bitcoin's getDifficulty.

	~~[http://blockexplorer.com/q/estimate Estimated next difficulty]~~

	[http://bitcoin.sipa.be Graphs]		[http://bitcoin.sipa.be Graphs]

Sunnankar: /* Related Links */

2015-07-13T18:56:47Z

BitKnocK at 12:15, 27 May 2015

2015-05-27T12:15:49Z

← Older revision		Revision as of 12:15, 27 May 2015
Line 155:		Line 155:
	** http://www.alloscomp.com/bitcoin/calculator.php		** http://www.alloscomp.com/bitcoin/calculator.php
	** http://www.vnbitcoin.org/bitcoincalculator.php		** http://www.vnbitcoin.org/bitcoincalculator.php
			** https://bitknock.com/calculator
	* Remember it's just probability! There are no guarantees you will win every N days.		* Remember it's just probability! There are no guarantees you will win every N days.

← Older revision		Revision as of 18:56, 13 July 2015
Line 161:		Line 161:

	* [https://docs.google.com/spreadsheet/ccc?key=0AiFMBvXvL2dtdEZkR2J4eU5rS3B4ei1iUmJxSWNlQ0E Bitcoin Difficulty History]		* [https://docs.google.com/spreadsheet/ccc?key=0AiFMBvXvL2dtdEZkR2J4eU5rS3B4ei1iUmJxSWNlQ0E Bitcoin Difficulty History]
			* [https://www.bitcoinmining.com/what-is-bitcoin-mining-difficulty/ What is Bitcoin Mining Difficulty?]
	* See also: [[target]]		* See also: [[target]]