- :ref:`Version 2 <term-v2-block>` was introduced in `Bitcoin Core 0.7.0 <https://bitcoin.org/en/release/v0.7.0>`__ (September 2012) as a soft fork. As described in `BIP34 <https://github.com/bitcoin/bips/blob/master/bip-0034.mediawiki>`__, valid :ref:`version 2 blocks <term-v2-block>` require a :ref:`block height parameter in the coinbase <term-coinbase-block-height>`. Also described in `BIP34 <https://github.com/bitcoin/bips/blob/master/bip-0034.mediawiki>`__ are rules for rejecting certain blocks; based on those rules, `Bitcoin Core 0.7.0 <https://bitcoin.org/en/release/v0.7.0>`__ and later versions began to reject :ref:`version 2 blocks <term-v2-block>` without the block height in coinbase at block height 224,412 (March 2013) and began to reject new version 1 blocks three weeks later at block height 227,930.
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