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Block chain reference

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- Version info updates
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{% autocrossref %} {% autocrossref %}
* **Version 1** was introduced in the genesis block (January 2009). * **Version 1** was used by Dash for the Genesis Block only.
* **[Version 2][v2 block]{:#term-v2-block}{:.term}** was introduced in * **[Version 2][v2 block]{:#term-v2-block}{:.term}** was introduced with
Bitcoin Core 0.7.0 (September 2012) as a soft fork. As described in the first block following the Genesis Block (January 2014). As described in
BIP34, valid version 2 blocks require a [block height parameter in the BIP34, valid version 2 blocks require a [block height parameter in the
coinbase][coinbase block height]. Also described in BIP34 are rules coinbase][coinbase block height].
<!-- Dash supported BIP34 from block 1
Also described in BIP34 are rules
for rejecting certain blocks; based on those rules, Bitcoin Core 0.7.0 for rejecting certain blocks; based on those rules, Bitcoin Core 0.7.0
and later versions began to reject version 2 blocks without the block and later versions began to reject version 2 blocks without the block
height in coinbase at block height 224,412 (March 2013) and began to 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. reject new version 1 blocks three weeks later at block height 227,930.
-->
<!-- source for heights: my (@harding) own headers dump and counting <!-- source for heights: my (@harding) own headers dump and counting
script --> script -->
* **Version 3** blocks were introduced in Bitcoin Core 0.10.0 (February * **Version 3** blocks were introduced in Dash Core 0.11.2 (March 2015) as a
2015) as a soft fork. When the fork reach full enforcement (July soft fork (Block 244,834 was the first version 3 block).
2015), it required strict DER encoding of all ECDSA signatures in new <!--Bitcoin Core 0.10.0 (February
blocks as described in BIP66. Transactions that do not use strict DER 2015) as a soft fork. -->
encoding had previously been non-standard since Bitcoin Core 0.8.0 When the fork reach full enforcement, it required strict DER encoding of all
(February 2012). ECDSA signatures in new blocks as described in BIP66. Transactions that do not
use strict DER encoding had previously been non-standard since Dash Core 0.8.0.
* **Version 4** blocks specified in BIP65 and introduced in Bitcoin Core 0.11.2 * **Version 4** blocks specified in BIP65 and introduced in Bitcoin Core 0.11.2
(November 2015) as a soft fork became active in December 2015. These blocks now support the new (November 2015) as a soft fork became active in December 2015. These blocks
`OP_CHECKLOCKTIMEVERIFY` opcode described in that BIP. now support the new `OP_CHECKLOCKTIMEVERIFY` opcode described in that BIP.
<!--
* **Version 536870913** blocks were introduced in Dash Core 0.??? (February 2017)
at block height 617,288.
* **Version 536870912** blocks were introduced in Dash Core 0.??? ( 2017).
-->
The mechanism used for the version 2, 3, and 4 upgrades is commonly The mechanism used for the version 2, 3, and 4 upgrades is commonly
called IsSuperMajority() after the function added to Bitcoin Core to called IsSuperMajority() after the function added to Dash Core to
manage those soft forking changes. See BIP34 for a full description of manage those soft forking changes. See BIP34 for a full description of
this method. this method.