mirror of
https://github.com/bitcoinbook/bitcoinbook
synced 2024-11-14 03:48:58 +00:00
62 lines
2.1 KiB
Plaintext
62 lines
2.1 KiB
Plaintext
--------------------------------------------------
|
|
BIP: 34
|
|
Title: Block v2, Height in Coinbase
|
|
Author: Gavin Andresen <gavinandresen@gmail.com>
|
|
Status: Accepted
|
|
Type: Standards Track
|
|
Created: 2012-07-06
|
|
--------------------------------------------------
|
|
|
|
[[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 value is added to newly
|
|
produced coinbase transactions, and blocks are updated to version 2.
|
|
|
|
[[motivation]]
|
|
Motivation
|
|
~~~~~~~~~~
|
|
|
|
1. Clarify and exercise the mechanism whereby the bitcoin network
|
|
collectively consents to upgrade transaction or block binary structures,
|
|
rules and behaviors.
|
|
2. Enforce block and transaction uniqueness, and assist unconnected
|
|
block validation.
|
|
|
|
[[specification]]
|
|
Specification
|
|
~~~~~~~~~~~~~
|
|
|
|
1. Treat transactions with a version greater than 1 as non-standard
|
|
(official Satoshi client will not mine or relay them).
|
|
2. 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).
|
|
3. 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)
|
|
4. 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
|
|
~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
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]]
|
|
Implementation
|
|
~~~~~~~~~~~~~~
|
|
|
|
https://github.com/bitcoin/bitcoin/pull/1526
|