BIP: 34 Layer: Consensus (soft fork) Title: Block v2, Height in Coinbase Author: Gavin Andresen <firstname.lastname@example.org> 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
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.
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.
Block number 227,835 (timestamp 2013-03-24 15:49:13 GMT) was the last version 1 block.