BIP 0034: Difference between revisions
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BIP: 34 | BIP: 34 | ||
Layer: Consensus (soft fork) | |||
Title: Block v2, Height in Coinbase | Title: Block v2, Height in Coinbase | ||
Author: Gavin Andresen <gavinandresen@gmail.com> | Author: Gavin Andresen <gavinandresen@gmail.com> | ||
Status: | Comments-Summary: No comments yet. | ||
Comments-URI: https://github.com/bitcoin/bips/wiki/Comments:BIP-0034 | |||
Status: Final | |||
Type: Standards Track | Type: Standards Track | ||
Created: 2012-07-06 | Created: 2012-07-06 | ||
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==Abstract== | ==Abstract== | ||
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 | 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. | ||
==Motivation== | ==Motivation== | ||
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# Treat transactions with a version greater than 1 as non-standard (official Satoshi client will not mine or relay them). | # Treat transactions with a version greater than 1 as non-standard (official Satoshi client will not mine or relay them). | ||
# 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 | # Add height as the first item in the coinbase transaction's scriptSig, and increase block version to 2. The format of the height is "minimally encoded serialized CScript" -- first byte is number of bytes in the number (will be 0x03 on main net for the next 150 or so years with 2<sup>23</sup>-1 blocks), following bytes are little-endian representation of the number (including a sign bit). Height is the height of the mined block in the block chain, where the genesis block is height zero (0). | ||
# If 750 of the last 1,000 blocks are version 2 or greater, reject invalid version 2 blocks. (testnet3: 51 of last 100) | # 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) | ||
# "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) | # 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) | ||
==Backward compatibility== | ==Backward compatibility== | ||
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==Implementation== | ==Implementation== | ||
https://github.com/bitcoin/bitcoin/pull/1526 | |||
==Result== | |||
Block number 227,835 (timestamp 2013-03-24 15:49:13 GMT) was the last version 1 block. | |||
Latest revision as of 21:27, 12 February 2021
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This page describes a BIP (Bitcoin Improvement Proposal). |
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Please do not modify this page. This is a mirror of the BIP from the source Git repository here. |
BIP: 34 Layer: Consensus (soft fork) Title: Block v2, Height in Coinbase Author: Gavin Andresen <gavinandresen@gmail.com> Comments-Summary: No comments yet. Comments-URI: https://github.com/bitcoin/bips/wiki/Comments:BIP-0034 Status: Final Type: Standards Track Created: 2012-07-06
Abstract
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.
Motivation
- Clarify and exercise the mechanism whereby the bitcoin network collectively consents to upgrade transaction or block binary structures, rules and behaviors.
- Enforce block and transaction uniqueness, and assist unconnected block validation.
Specification
- Treat transactions with a version greater than 1 as non-standard (official Satoshi client will not mine or relay them).
- Add height as the first item in the coinbase transaction's scriptSig, and increase block version to 2. The format of the height is "minimally encoded serialized CScript" -- first byte is number of bytes in the number (will be 0x03 on main net for the next 150 or so years with 223-1 blocks), following bytes are little-endian representation of the number (including a sign bit). Height is the height of the mined block in the block chain, where the genesis block is height zero (0).
- 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)
- 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)
Backward compatibility
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.
Implementation
https://github.com/bitcoin/bitcoin/pull/1526
Result
Block number 227,835 (timestamp 2013-03-24 15:49:13 GMT) was the last version 1 block.