Block Version History

Version Number Proposed In Released Summary
Aug 2017 Bitcoin Cash hard fork.
4 BIP-0065 Nov 2015
Bitcoin Core 0.11.2
Added support for OP_CHECKLOCKTIMEVERIFY opcode.
3 BIP-0066 Jul 2015
Bitcoin Core 0.10.0
Added enforcement of DER encoding of all ECDSA signatures in new blocks.
2 BIP-0034 Sep 2012
Bitcoin Core 0.7.0
Added the block height within the block coinbase.
1 Jan 2009 The format used in the genesis block.