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| ==Abstract==
| | {{BipMoved|bip-0034.mediawiki|BIP 0034}} |
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| Bitcoin blocks and transactions are versioned binary structures. Both currently use version 1. This BIP introduces an upgrade path for versioned transactions and blocks. A unique value is added to newly produced coinbase transactions, and blocks are updated to version 2.
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| ==Motivation==
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| # Clarify and exercise the mechanism whereby the bitcoin network collectively consents to upgrade transaction or block binary structures, rules and behaviors.
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| # Enforce block and transaction uniqueness, and assist unconnected block validation.
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| ==Specification==
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| # Treat transactions with a version greater than 1 as non-standard (official Satoshi client will not mine or relay them).
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| # Add height as the first item in the coinbase transaction's scriptSig, and increase block version to 2. The format of the height is "serialized CScript" -- first byte is number of bytes in the number (will be 0x03 on main net for the next 300 or so years), following bytes are little-endian representation of the number. Height is the height of the mined block in the block chain, where the genesis block is height zero (0).
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| # 75% rule: If 750 of the last 1,000 blocks are version 2 or greater, reject invalid version 2 blocks. (testnet3: 51 of last 100)
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| # 95% rule ("Point of no return"): If 950 of the last 1,000 blocks are version 2 or greater, reject all version 1 blocks. (testnet3: 75 of last 100)
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| ==Backward compatibility==
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| All older clients are compatible with this change. Users and merchants should not be impacted. Miners are strongly recommended to upgrade to version 2 blocks. Once 95% of the miners have upgraded to version 2, the remainder will be orphaned if they fail to upgrade.
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| ==Implementation==
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| https://github.com/bitcoin/bitcoin/pull/1526
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| [[Category:Developer]]
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| [[Category:Technical]]
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| [[Category:BIP|D]]
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Revision as of 07:51, 6 December 2013
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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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BIP: 34
Title: Block v2, Height in Coinbase
Author: Gavin Andresen <gavinandresen@gmail.com>
Status: Accepted
Type: Standards Track
Created: 2012-07-06
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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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