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| | {{bip}} |
| | {{BipMoved|bip-0100.mediawiki}} |
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| | == History == |
| {{infobox BIP | | {{infobox BIP |
| |name=BIP 0100 | | |name=BIP 0100 |
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| }}'''BIP 0100''' is a [[Bitcoin Improvement Proposal]] for increasing the maximum block size. | | }}'''BIP 0100''' is a [[Bitcoin Improvement Proposal]] for increasing the maximum block size. |
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| {{BIP begin}}
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| <pre>
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| BIP: 100
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| Title: Block v4, floating block size hard limit
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| Author: Jeff Garzik <jgarzik@gmail.com>
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| Status: Draft
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| Type: Standards Track
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| Created: 2015-06-11
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| </pre>
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| ==Abstract==
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| Replace static 1M block size hard limit with a hard limit that floats between 1M and 32M.
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| ==Motivation==
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| # Long term, wean the bitcoin protocol away from any block size limit; let the free market establish a natural size limit equilibrium.
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| # Eliminate 1M limit as impediment to adoption.
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| # Execute a hard fork network upgrade within safety rails, gathering data and experience for future upgrades.
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| # Contain checks-and-balances that users must opt into, to enable system activation and growth.
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| # Validated growth: a large majority (80%) is required to change the value.
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| ==Specification==
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| # Replace static 1M block size hard limit with a floating limit ("hardLimit").
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| # hardLimit floats within the range 1-32M, inclusive.
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| # Initial value of hardLimit is 1M, preserving current system.
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| # Changing hardLimit is accomplished by encoding a proposed value within a block's coinbase scriptSig.
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| ## Votes refer to a byte value, encoded within the pattern "/B\d+[M]{0,1}/" Uppercase suffix 'M' applies a 1,000,000x multiplier. Example: /B8000000/ or /B8M/ votes for a 8,000,000-byte hardLimit.
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| ## A new hardLimit is calculated at each difficult adjustment period (2016 blocks), and applies to the next 2016 blocks.
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| ## Calculation:
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| ### Absent/invalid votes are counted as votes for the current hardLimit. Out of range votes are counted as the nearest in-range value.
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| ### Votes are limited to +/- 20% of the current hardLimit.
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| ### Sort the votes from the previous 12,000 blocks from lowest to highest.
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| ### The raise value is defined as a vote for 2400th highest block (20th percentile).
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| ### The lower value is defined as a vote for 9600th highest block (80th percentile).
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| ### If the raise value is higher than current hardLimit, the new limit becomes the raise value.
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| ### If the lower value is lower than current hardLimit, the new limit becomes the lower value.
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| ### Otherwise, hardLimit is unchanged.
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| # 75% rule: If 9,000 of the last 12,000 blocks are version 4 or greater, reject invalid version 4 blocks. (testnet4: 501 of last 1000)
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| # 95% rule ("Point of no return"): If 11,400 of the last 12,000 blocks are version 4 or greater, reject all version <= 3 blocks. (testnet4: 750 of last 1000)
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| # Block version number is calculated after masking out high 16 bits (final bit count TBD by versionBits outcome).
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| ==Backward compatibility==
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| All older clients are not compatible with this change. The first block larger than 1M will create a network partition excluding not-upgraded network nodes and miners.
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| {{end}}
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| {{BIPs}} | | {{BIPs}} |
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This page describes a BIP (Bitcoin Improvement Proposal).
Please see BIP 2 for more information about BIPs and creating them. Please do not just create a wiki page.
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Please do not modify this page. This is a mirror of the BIP from the source Git repository here.
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History
BIP 0100
| Long title | Block v4, floating block size hard limit |
| Type | Standards Track |
| BIPN | 100 |
| Author(s) | Jeff Garzik |
| Status | Draft |
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History
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| Proposition | June 11, 2015 |
BIP 0100 is a Bitcoin Improvement Proposal for increasing the maximum block size.
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| | | | Informational | |
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| | P2SH | |
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| | Block size | |
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Accepted BIPs are in bold; withdrawn or rejected BIPs are in italic. |
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