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62 lines
2.1 KiB
62 lines
2.1 KiB
--------------------------------------------------
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BIP: 34
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Title: Block v2, Height in Coinbase
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Author: Gavin Andresen <gavinandresen@gmail.com>
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Status: Accepted
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Type: Standards Track
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Created: 2012-07-06
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--------------------------------------------------
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[[abstract]]
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Abstract
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~~~~~~~~
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Bitcoin blocks and transactions are versioned binary structures. Both
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currently use version 1. This BIP introduces an upgrade path for
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versioned transactions and blocks. A unique value is added to newly
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produced coinbase transactions, and blocks are updated to version 2.
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[[motivation]]
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Motivation
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~~~~~~~~~~
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1. Clarify and exercise the mechanism whereby the bitcoin network
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collectively consents to upgrade transaction or block binary structures,
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rules and behaviors.
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2. Enforce block and transaction uniqueness, and assist unconnected
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block validation.
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[[specification]]
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Specification
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~~~~~~~~~~~~~
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1. Treat transactions with a version greater than 1 as non-standard
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(official Satoshi client will not mine or relay them).
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2. Add height as the first item in the coinbase transaction's
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scriptSig, and increase block version to 2. The format of the height is
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"serialized CScript" -- first byte is number of bytes in the number
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(will be 0x03 on main net for the next 300 or so years), following bytes
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are little-endian representation of the number. Height is the height of
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the mined block in the block chain, where the genesis block is height
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zero (0).
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3. 75% rule: If 750 of the last 1,000 blocks are version 2 or greater,
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reject invalid version 2 blocks. (testnet3: 51 of last 100)
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4. 95% rule ("Point of no return"): If 950 of the last 1,000 blocks are
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version 2 or greater, reject all version 1 blocks. (testnet3: 75 of last
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100)
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[[backward-compatibility]]
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Backward compatibility
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~~~~~~~~~~~~~~~~~~~~~~
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All older clients are compatible with this change. Users and merchants
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should not be impacted. Miners are strongly recommended to upgrade to
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version 2 blocks. Once 95% of the miners have upgraded to version 2, the
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remainder will be orphaned if they fail to upgrade.
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[[implementation]]
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Implementation
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~~~~~~~~~~~~~~
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https://github.com/bitcoin/bitcoin/pull/1526
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